Add RestConf Collector

Issue-ID: DCAEGEN2-612

1. Instantiated to support CCVPN Close Loop Use Case
2. In general, this supports data collection from all PNF or devices that supports RestConf protocol

Change-Id: I6311ad618e8d68badc5423a63d7781a19dc62829
Signed-off-by: rama-huawei <rama.subba.reddy.s@huawei.com>

26 files changed, 2808 insertions, 0 deletions

diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/AnyNode.java b/src/main/java/org/onap/dcae/collectors/restconf/common/AnyNode.java
new file mode 100755
index 0000000..044a9cf
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/AnyNode.java
@@ -0,0 +1,127 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import io.vavr.collection.List;
+import io.vavr.collection.Set;
+import io.vavr.control.Option;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.stream.StreamSupport;
+
+import static io.vavr.API.Set;
+
+public class AnyNode {
+    private Object obj;
+
+    private AnyNode(Object object) {
+        this.obj = object;
+    }
+
+    public static AnyNode fromString(String content) {
+        return new AnyNode(new JSONObject(content));
+    }
+
+    /**
+     * Returns key set of underlying object. It is assumed that underlying object is of type org.json.JSONObject.
+     *
+     * @return key set of underlying objects
+     */
+    public Set<String> keys() {
+        return Set(asJsonObject().keySet().toArray(new String[]{}));
+    }
+
+    /**
+     * Returns value associated with specified key wrapped with AnyValue object. It is assumed that this is of type
+     * org.json.JSONObject.
+     *
+     * @param key for querying value from jsonobject
+     * @return value associated with specified key
+     */
+    public AnyNode get(String key) {
+        return new AnyNode(asJsonObject().get(key));
+    }
+
+    /**
+     * Returns string representation of this. If it happens to have null, the value is treated as
+     * org.json.JSONObject.NULL and "null" string is returned then.
+     *
+     * @return string representation of this
+     */
+    public String toString() {
+        return this.obj.toString();
+    }
+
+    /**
+     * Returns optional of object under specified key, wrapped with AnyNode object.
+     * If underlying object is not of type org.json.JSONObject
+     * or underlying object has no given key
+     * or given key is null
+     * then Optional.empty will be returned.
+     *
+     * @param key for querying value from AnyNode object
+     * @return optional of object under specified key
+     */
+    public Option<AnyNode> getAsOption(String key) {
+        try {
+            AnyNode value = get(key);
+            if (value.toString().equals("null")) {
+                return Option.none();
+            }
+            return Option.some(value);
+        } catch (JSONException ex) {
+            return Option.none();
+        }
+    }
+
+    /**
+     * Converts underlying object to map representation with map values wrapped with AnyNode object. It is assumed that
+     * underlying object is of type org.json.JSONObject.
+     *
+     * @return converts underlying object to map representation
+     */
+    public List<AnyNode> toList() {
+        return List.ofAll(StreamSupport.stream(((JSONArray) this.obj).spliterator(), false).map(AnyNode::new));
+    }
+
+    /**
+     * Checks if specified key is present in this. It is assumed that this is of type JSONObject.
+     *
+     * @param key is used to check presence in anynode object
+     * @return true if specified key is present in this
+     */
+    public boolean has(String key) {
+        return !getAsOption(key).isEmpty();
+    }
+
+    /**
+     * Returns as JSONObject.
+     *
+     * @return jsonobject
+     */
+    private JSONObject asJsonObject() {
+        return (JSONObject) this.obj;
+    }
+
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/AuthType.java b/src/main/java/org/onap/dcae/collectors/restconf/common/AuthType.java
new file mode 100755
index 0000000..47ae8ac
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/AuthType.java
@@ -0,0 +1,43 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.restconf.common;
+
+public enum AuthType {
+    NONE, BASIC, DIGEST, OAUTH, Unspecified;
+
+    public static AuthType fromString(String s) {
+        if ("basic".equalsIgnoreCase(s)) {
+            return BASIC;
+        }
+        if ("digest".equalsIgnoreCase(s)) {
+            return DIGEST;
+        }
+        if ("oauth".equalsIgnoreCase(s)) {
+            return OAUTH;
+        }
+        if ("none".equalsIgnoreCase(s)) {
+            return NONE;
+        }
+        if ("unspecified".equalsIgnoreCase(s)) {
+            return Unspecified;
+        }
+        throw new IllegalArgumentException("Invalid value for format: " + s);
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/Constants.java b/src/main/java/org/onap/dcae/collectors/restconf/common/Constants.java
new file mode 100755
index 0000000..4845bfc
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/Constants.java
@@ -0,0 +1,38 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+public class Constants {
+    public static final String KDEFAULT_TEMP_FILENAME = "templateFileName";
+    public static final String KSETTING_REST_API_URL = "restapiUrl";
+    public static final String KSETTING_HTTP_METHOD = "httpMethod";
+    public static final String KSETTING_RESP_PREFIX = "responsePrefix";
+    public static final String KSETTING_SKIP_SENDING = "skipSending";
+    public static final String KSETTING_FORMAT = "format";
+    public static final String KSETTING_DMAAPCONFIGS = "collector.dmaapfile";
+    public static final String[] KDEFAULT_DMAAPCONFIGS = new String[]{"./etc/DmaapConfig.json"};
+    public static final String KSETTING_SSE_CONNECT_URL = "sseConnectURL";
+    public static final int KDEFAULT_MAXQUEUEDEVENTS = 1024 * 4;
+    public static final String RESPONSE_CODE = "restapi-result.response-code";
+    public static final String OUTPUT_IDENTIFIER = "restapi-result.ietf-subscribed-notifications:output.identifier";
+    public static final String RESPONSE_CODE_200 = "200";
+    public static final String KCONFIG = "c";
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/DataChangeEventListener.java b/src/main/java/org/onap/dcae/collectors/restconf/common/DataChangeEventListener.java
new file mode 100755
index 0000000..97ee623
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/DataChangeEventListener.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import org.glassfish.jersey.media.sse.EventListener;
+import org.glassfish.jersey.media.sse.InboundEvent;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class DataChangeEventListener implements EventListener {
+    private static final Logger log = LoggerFactory.getLogger(DataChangeEventListener.class);
+    private RestConfContext ctx;
+
+    public DataChangeEventListener(RestConfContext ctx) {
+        this.ctx = ctx;
+    }
+
+    @Override
+    public void onEvent(InboundEvent event) {
+        JSONArray jsonArrayMod;
+        log.info("On SSE Event is received");
+        String s = event.readData();
+        JSONObject jsonObj = new JSONObject(s);
+        jsonArrayMod = new JSONArray().put(jsonObj);
+        try {
+            RestConfProc.handleEvents(jsonArrayMod);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/EventProcessor.java b/src/main/java/org/onap/dcae/collectors/restconf/common/EventProcessor.java
new file mode 100755
index 0000000..3409f9c
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/EventProcessor.java
@@ -0,0 +1,88 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+
+import org.json.JSONObject;
+import org.onap.dcae.collectors.restconf.common.event.publishing.EventPublisher;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+public class EventProcessor implements Runnable {
+    private static final Logger log = LoggerFactory.getLogger(EventProcessor.class);
+
+    static Map<String, String[]> streamidHash = new HashMap<>();
+    public JSONObject event;
+    private EventPublisher eventPublisher;
+
+    public EventProcessor(EventPublisher eventPublisher) {
+        this.eventPublisher = eventPublisher;
+        streamidHash = parseStreamIdToStreamHashMapping(new RestConfProc().streamID);
+    }
+
+    private Map<String, String[]> parseStreamIdToStreamHashMapping(String streamId) {
+        Map<String, String[]> streamidHash = new HashMap<>();
+        String[] list = streamId.split("\\|");
+        for (String aList : list) {
+            String domain = aList.split("=")[0];
+            String[] streamIdList = aList.substring(aList.indexOf('=') + 1).split(",");
+            streamidHash.put(domain, streamIdList);
+        }
+        return streamidHash;
+    }
+
+    @Override
+    public void run() {
+        try {
+
+            while (true) {
+                event = RestConfProc.fProcessingInputQueue.take();
+                // As long as the producer is running we remove elements from
+                // the queue.
+                log.info("QueueSize:" + RestConfProc.fProcessingInputQueue.size() + "\tEventProcessor\tRemoving element: " +
+                                 event);
+                String[] streamIdList = streamidHash.get("route");
+                log.debug("streamIdList:" + Arrays.toString(streamIdList));
+
+                if (streamIdList.length == 0) {
+                    log.error("No StreamID defined for publish - Message dropped" + event);
+                } else {
+                    sendEventsToStreams(streamIdList);
+                }
+                log.debug("Event published" + event);
+            }
+        } catch (Exception e) {
+            log.error("EventProcessor InterruptedException" + e.getMessage());
+            Thread.currentThread().interrupt();
+        }
+    }
+
+    private void sendEventsToStreams(String[] streamIdList) {
+        for (String aStreamIdList : streamIdList) {
+            log.info("Invoking publisher for streamId:" + aStreamIdList);
+            eventPublisher.sendEvent(event, aStreamIdList);
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/Format.java b/src/main/java/org/onap/dcae/collectors/restconf/common/Format.java
new file mode 100755
index 0000000..94344d6
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/Format.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.restconf.common;
+
+public enum Format {
+    JSON, XML, NONE;
+
+    public static Format fromString(String s) {
+        if ("json".equalsIgnoreCase(s)) {
+            return JSON;
+        }
+        if ("xml".equalsIgnoreCase(s)) {
+            return XML;
+        }
+        if ("none".equalsIgnoreCase(s)) {
+            return NONE;
+        }
+        throw new IllegalArgumentException("Invalid value for format: " + s);
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/HttpMethod.java b/src/main/java/org/onap/dcae/collectors/restconf/common/HttpMethod.java
new file mode 100755
index 0000000..d85d5f5
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/HttpMethod.java
@@ -0,0 +1,48 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+
+package org.onap.dcae.collectors.restconf.common;
+
+public enum HttpMethod {
+    GET, POST, PUT, DELETE, PATCH;
+
+    public static HttpMethod fromString(String s) {
+        if (s == null) {
+            return null;
+        }
+        if (s.equalsIgnoreCase("get")) {
+            return GET;
+        }
+        if (s.equalsIgnoreCase("post")) {
+            return POST;
+        }
+        if (s.equalsIgnoreCase("put")) {
+            return PUT;
+        }
+        if (s.equalsIgnoreCase("delete")) {
+            return DELETE;
+        }
+        if (s.equalsIgnoreCase("patch")) {
+            return PATCH;
+        }
+        throw new IllegalArgumentException("Invalid value for HTTP Method: " + s);
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/HttpResponse.java b/src/main/java/org/onap/dcae/collectors/restconf/common/HttpResponse.java
new file mode 100755
index 0000000..e1b97da
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/HttpResponse.java
@@ -0,0 +1,30 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import javax.ws.rs.core.MultivaluedMap;
+
+public class HttpResponse {
+    public int code;
+    public String message;
+    public String body;
+    public MultivaluedMap<String, String> headers;
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/JsonParser.java b/src/main/java/org/onap/dcae/collectors/restconf/common/JsonParser.java
new file mode 100755
index 0000000..f29bbc3
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/JsonParser.java
@@ -0,0 +1,92 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class JsonParser {
+
+    private static final Logger log = LoggerFactory.getLogger(JsonParser.class);
+
+    private JsonParser() {
+        // Preventing instantiation of the same.
+    }
+
+    @SuppressWarnings("unchecked")
+    public static Map<String, String> convertToProperties(String s)
+            throws Exception {
+
+        checkNotNull(s, "Input should not be null.");
+
+        try {
+            JSONObject json = new JSONObject(s);
+            Map<String, Object> wm = new HashMap<>();
+            Iterator<String> ii = json.keys();
+            while (ii.hasNext()) {
+                String key1 = ii.next();
+                wm.put(key1, json.get(key1));
+            }
+
+            Map<String, String> mm = new HashMap<>();
+
+            while (!wm.isEmpty())
+                for (String key : new ArrayList<>(wm.keySet())) {
+                    Object o = wm.get(key);
+                    wm.remove(key);
+
+                    if (o instanceof Boolean || o instanceof Number || o instanceof String) {
+                        mm.put(key, o.toString());
+
+                        log.info("Added property: {} : {}", key, o.toString());
+                    } else if (o instanceof JSONObject) {
+                        JSONObject jo = (JSONObject) o;
+                        Iterator<String> i = jo.keys();
+                        while (i.hasNext()) {
+                            String key1 = i.next();
+                            wm.put(key + "." + key1, jo.get(key1));
+                        }
+                    } else if (o instanceof JSONArray) {
+                        JSONArray ja = (JSONArray) o;
+                        mm.put(key + "_length", String.valueOf(ja.length()));
+
+                        log.info("Added property: {}_length: {}", key, String.valueOf(ja.length()));
+
+                        for (int i = 0; i < ja.length(); i++)
+                            wm.put(key + '[' + i + ']', ja.get(i));
+                    }
+                }
+            return mm;
+        } catch (JSONException e) {
+            throw new Exception("Unable to convert JSON to properties" + e.getLocalizedMessage(), e);
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/Parameters.java b/src/main/java/org/onap/dcae/collectors/restconf/common/Parameters.java
new file mode 100755
index 0000000..02fd68b
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/Parameters.java
@@ -0,0 +1,52 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import java.util.Set;
+
+public class Parameters {
+    public String templateFileName;
+    public String restapiUrl;
+    public String restapiUser;
+    public String restapiPassword;
+    public Format format;
+    public String contentType;
+    public HttpMethod httpMethod;
+    public String responsePrefix;
+    public Set<String> listNameList;
+    public boolean skipSending;
+    public boolean convertResponse;
+    public String keyStoreFileName;
+    public String keyStorePassword;
+    public String trustStoreFileName;
+    public String trustStorePassword;
+    public boolean ssl;
+    public String customHttpHeaders;
+    public String partner;
+    public Boolean dumpHeaders;
+    public String requestBody;
+    public String oAuthConsumerKey;
+    public String oAuthConsumerSecret;
+    public String oAuthSignatureMethod;
+    public String oAuthVersion;
+    public AuthType authtype;
+    public Boolean returnRequestPayload;
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfCollector.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfCollector.java
new file mode 100755
index 0000000..754c73d
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfCollector.java
@@ -0,0 +1,66 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import com.att.nsa.cmdLine.NsaCommandLineUtil;
+import com.att.nsa.drumlin.service.framework.DrumlinServlet;
+import com.att.nsa.drumlin.till.nv.impl.nvPropertiesFile;
+import com.att.nsa.drumlin.till.nv.impl.nvReadableStack;
+import com.att.nsa.drumlin.till.nv.impl.nvReadableTable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.URL;
+import java.util.Map;
+
+public class RestConfCollector {
+
+    public static final Logger eplog = LoggerFactory.getLogger("org.onap.restconf.common.error");
+
+    public static void main(String[] args) {
+        try {
+            final Map<String, String> argMap = NsaCommandLineUtil.processCmdLine(args, true);
+            final String config = NsaCommandLineUtil.getSetting(argMap, Constants.KCONFIG, "collector.properties");
+            final URL settingStream = DrumlinServlet.findStream(config, RestConfCollector.class);
+
+            final nvReadableStack settings = new nvReadableStack();
+            settings.push(new nvPropertiesFile(settingStream));
+            settings.push(new nvReadableTable(argMap));
+
+            RestConfProc restConfProc = new RestConfProc(settings);
+            Map<String, String> paraMap = restConfProc.getParaMap();
+            String restApiURL = paraMap.get(Constants.KSETTING_REST_API_URL);
+            String sseEventsURL = paraMap.get(Constants.KSETTING_SSE_CONNECT_URL);
+            String[] listRestApiURL = restApiURL.split(";");
+            String[] listSseEventsURL = sseEventsURL.split(";");
+            for (int i = 0; i < listRestApiURL.length; i++) {
+                paraMap.put(Constants.KSETTING_REST_API_URL, "http://" + listRestApiURL[i] +
+                        "/RestConfServer/rest/operations/establish-subscription");
+                paraMap.put(Constants.KSETTING_SSE_CONNECT_URL, listSseEventsURL[i]);
+                restConfProc.establishSubscription(paraMap, restConfProc.getCtx());
+            }
+
+        } catch (Exception e) {
+            RestConfCollector.eplog.error("Fatal error during application startup", e);
+            throw new RuntimeException(e);
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfContext.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfContext.java
new file mode 100755
index 0000000..4cb16ae
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfContext.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import java.util.HashMap;
+import java.util.Set;
+
+public class RestConfContext {
+    private HashMap<String, String> attributes;
+
+    public RestConfContext() {
+        attributes = new HashMap<>();
+    }
+
+    public String getAttribute(String name) {
+        return attributes.getOrDefault(name, null);
+    }
+
+    public void setAttribute(String name, String value) {
+        if (value == null) {
+            if (attributes.containsKey(name)) {
+                attributes.remove(name);
+            }
+        } else {
+            attributes.put(name, value);
+        }
+    }
+
+    public Set<String> getAttributeKeySet() {
+        return attributes.keySet();
+    }
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfProc.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfProc.java
new file mode 100755
index 0000000..67ea1fb
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RestConfProc.java
@@ -0,0 +1,224 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import com.att.nsa.drumlin.till.nv.rrNvReadable;
+import org.glassfish.jersey.media.sse.EventSource;
+import org.glassfish.jersey.media.sse.SseFeature;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.onap.dcae.collectors.restconf.common.event.publishing.DMaaPConfigurationParser;
+import org.onap.dcae.collectors.restconf.common.event.publishing.EventPublisher;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.client.Client;
+import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.WebTarget;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.LinkedBlockingQueue;
+
+
+public class RestConfProc {
+
+    private static final Logger log = LoggerFactory.getLogger(RestConfProc.class);
+
+    public static String format;
+
+    private static RestConfContext ctx = new RestConfContext();
+
+    private static final Logger oplog = LoggerFactory.getLogger("org.onap.restconf.common.output");
+
+    private Map<String, PersistentConnection> runnableInfo = new ConcurrentHashMap<>();
+
+    private final Map<String, String> paraMap = new HashMap<>();
+    private static String cambriaConfigFile;
+
+    public static LinkedBlockingQueue<JSONObject> fProcessingInputQueue;
+
+    public static String streamID;
+    private ExecutorService executor = Executors.newCachedThreadPool();
+
+    public RestConfProc() {
+    }
+
+    private void parseInputParameters(rrNvReadable settings) {
+        String tempFileName;
+        String restApiUrl;
+        String httpMetthod;
+        String respPrefix;
+        String skipSending;
+        String sseConnectUrl;
+        String[] currentConfigFile;
+
+        currentConfigFile = settings.getStrings(Constants.KSETTING_DMAAPCONFIGS, Constants.KDEFAULT_DMAAPCONFIGS);
+        cambriaConfigFile = currentConfigFile[0];
+
+        tempFileName = settings.getString(Constants.KDEFAULT_TEMP_FILENAME, null);
+        restApiUrl = settings.getString(Constants.KSETTING_REST_API_URL, null);
+        httpMetthod = settings.getString(Constants.KSETTING_HTTP_METHOD, null);
+        respPrefix = settings.getString(Constants.KSETTING_RESP_PREFIX, null);
+        skipSending = settings.getString(Constants.KSETTING_SKIP_SENDING, null);
+        sseConnectUrl = settings.getString(Constants.KSETTING_SSE_CONNECT_URL, null);
+        format = settings.getString(Constants.KSETTING_FORMAT, null);
+        streamID = "route=route_failure";
+
+        paraMap.put(Constants.KDEFAULT_TEMP_FILENAME, tempFileName);
+        paraMap.put(Constants.KSETTING_REST_API_URL, restApiUrl);
+        paraMap.put(Constants.KSETTING_HTTP_METHOD, httpMetthod);
+        paraMap.put(Constants.KSETTING_RESP_PREFIX, respPrefix);
+        paraMap.put(Constants.KSETTING_SKIP_SENDING, skipSending);
+        paraMap.put(Constants.KSETTING_SSE_CONNECT_URL, sseConnectUrl);
+        paraMap.put(Constants.KSETTING_FORMAT, format);
+
+        ctx.setAttribute("prop.encoding-json", "encoding-json");
+        ctx.setAttribute("restapi-result.response-code", "200");
+        ctx.setAttribute("restapi-result.ietf-subscribed-notifications:output.identifier", "100");
+    }
+
+    public RestConfProc(rrNvReadable settings) {
+
+        parseInputParameters(settings);
+
+        fProcessingInputQueue = new LinkedBlockingQueue<>(Constants.KDEFAULT_MAXQUEUEDEVENTS);
+
+        EventProcessor ep = new EventProcessor(EventPublisher.createPublisher(oplog,
+                                                                              DMaaPConfigurationParser
+                                                                                      .parseToDomainMapping(Paths.get(cambriaConfigFile))
+                                                                                      .get()));
+        ExecutorService executor = Executors.newFixedThreadPool(20);
+        for (int i = 0; i < 20; ++i) {
+            executor.execute(ep);
+        }
+    }
+
+    /**
+     * To establish a subscription with controller by sending HTTP request
+     *
+     * @param paramMap holds the input configuration
+     * @param ctx      restconf context
+     * @throws Exception exception
+     */
+    public void establishSubscription(Map<String, String> paramMap, RestConfContext ctx) throws Exception {
+
+        RestapiCallNode restApiCallNode = new RestapiCallNode();
+
+        restApiCallNode.sendRequest(paramMap, ctx, null);
+
+        establishPersistentConnection(paramMap, ctx);
+    }
+
+    /**
+     * To establish persistent connection after receiving successful subscription response from controller
+     *
+     * @param paramMap holds the input configuration
+     * @param ctx      restconf context
+     */
+    public void establishPersistentConnection(Map<String, String> paramMap, RestConfContext ctx) {
+
+        // check whether response is ok
+        if (ctx.getAttribute(Constants.RESPONSE_CODE).equals(Constants.RESPONSE_CODE_200)) {
+
+            String id = ctx.getAttribute(Constants.OUTPUT_IDENTIFIER);
+
+            String url = paramMap.get(Constants.KSETTING_SSE_CONNECT_URL);
+
+            PersistentConnection connection = new PersistentConnection(url, ctx);
+            runnableInfo.put(id, connection);
+            executor.execute(connection);
+        } else {
+            // error response is already updated in ctx
+            log.info("Failed to subscribe");
+        }
+    }
+
+    /**
+     * Get input parameter map
+     *
+     * @return input parameters map
+     */
+    public Map<String, String> getParaMap() {
+        return paraMap;
+    }
+
+
+    /**
+     * Get restConf context which has information about message encoding type
+     *
+     * @return restconf context
+     */
+    public RestConfContext getCtx() {
+        return ctx;
+    }
+
+    public class PersistentConnection implements Runnable {
+        private String url;
+        private RestConfContext ctx;
+        private volatile boolean running = true;
+
+        public PersistentConnection(String url, RestConfContext ctx) {
+            this.url = url;
+            this.ctx = ctx;
+        }
+
+        @Override
+        public void run() {
+            Client client = ClientBuilder.newBuilder()
+                    .register(SseFeature.class).build();
+            WebTarget target = client.target(url);
+            EventSource eventSource = EventSource.target(target).build();
+            eventSource.register(new DataChangeEventListener(ctx));
+            eventSource.open();
+            log.info("Connected to SSE source");
+            while (running) {
+                try {
+                    Thread.sleep(5000);
+                } catch (InterruptedException ie) {
+                    log.info("Exception: " + ie.getMessage());
+                }
+            }
+            eventSource.close();
+            log.info("Closed connection to SSE source");
+        }
+    }
+
+    /**
+     * To process the array of events which are received from controller
+     *
+     * @param a JSONArray
+     * @throws Exception exception
+     */
+    public static void handleEvents(JSONArray a) throws Exception {
+        for (int i = 0; i < a.length(); i++) {
+            if (!fProcessingInputQueue.offer(a.getJSONObject(i))) {
+                throw new Exception();
+            }
+        }
+        log.debug("RestConfCollector.handleEvents:EVENTS has been published successfully!");
+    }
+}
+
+
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RestapiCallNode.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RestapiCallNode.java
new file mode 100755
index 0000000..a324e87
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RestapiCallNode.java
@@ -0,0 +1,600 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientHandlerException;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.UniformInterfaceException;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.config.ClientConfig;
+import com.sun.jersey.api.client.config.DefaultClientConfig;
+import com.sun.jersey.api.client.filter.HTTPBasicAuthFilter;
+import com.sun.jersey.api.client.filter.HTTPDigestAuthFilter;
+import com.sun.jersey.client.urlconnection.HTTPSProperties;
+import com.sun.jersey.oauth.client.OAuthClientFilter;
+import com.sun.jersey.oauth.signature.OAuthParameters;
+import com.sun.jersey.oauth.signature.OAuthSecrets;
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import javax.ws.rs.core.EntityTag;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.core.UriBuilder;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.SocketException;
+import java.net.URI;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.KeyStore;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class RestapiCallNode {
+    private static final Logger log = LoggerFactory.getLogger(RestapiCallNode.class);
+
+    public void sendRequest(Map<String, String> paramMap, RestConfContext ctx, Integer retryCount) throws Exception {
+        RetryPolicy retryPolicy = null;
+        HttpResponse r = new HttpResponse();
+        try {
+            Parameters p = getParameters(paramMap);
+            String pp = p.responsePrefix != null ? p.responsePrefix + '.' : "";
+            String req = null;
+            if (p.templateFileName != null) {
+                String reqTemplate = readFile(p.templateFileName);
+                req = buildXmlJsonRequest(ctx, reqTemplate, p.format);
+            } else if (p.requestBody != null) {
+                req = p.requestBody;
+            }
+
+            r = sendHttpRequest(req, p);
+            setResponseStatus(ctx, p.responsePrefix, r);
+
+            if (p.dumpHeaders && r.headers != null) {
+                for (Map.Entry<String, List<String>> a : r.headers.entrySet()) {
+                    ctx.setAttribute(pp + "header." + a.getKey(), StringUtils.join(a.getValue(), ","));
+                }
+            }
+
+            if (p.returnRequestPayload && req != null) {
+                ctx.setAttribute(pp + "httpRequest", req);
+            }
+
+            if (r.body != null && r.body.trim().length() > 0) {
+                ctx.setAttribute(pp + "httpResponse", r.body);
+
+                if (p.convertResponse) {
+                    Map<String, String> mm = null;
+                    if (p.format == Format.XML) {
+                        mm = XmlParser.convertToProperties(r.body, p.listNameList);
+                    } else if (p.format == Format.JSON) {
+                        mm = JsonParser.convertToProperties(r.body);
+                    }
+
+                    if (mm != null) {
+                        for (Map.Entry<String, String> entry : mm.entrySet())
+                            ctx.setAttribute(pp + entry.getKey(), entry.getValue());
+                    }
+                }
+            }
+        } catch (Exception e) {
+            boolean shouldRetry = false;
+            if (e.getCause().getCause() instanceof SocketException) {
+                shouldRetry = true;
+            }
+
+            log.error("Error sending the request: " + e.getMessage(), e);
+            String prefix = parseParam(paramMap, "responsePrefix", false, null);
+            if (retryPolicy == null || shouldRetry == false) {
+                setFailureResponseStatus(ctx, prefix, e.getMessage(), r);
+            } else {
+                if (retryCount == null) {
+                    retryCount = 0;
+                }
+                String retryMessage = retryCount + " attempts were made out of " + retryPolicy.getMaximumRetries() +
+                        " maximum retries.";
+                log.debug(retryMessage);
+                try {
+                    retryCount = retryCount + 1;
+                    if (retryCount < retryPolicy.getMaximumRetries() + 1) {
+                        URI uri = new URI(paramMap.get("restapiUrl"));
+                        String hostname = uri.getHost();
+                        String retryString = retryPolicy.getNextHostName(uri.toString());
+                        URI uriTwo = new URI(retryString);
+                        URI retryUri = UriBuilder.fromUri(uri).host(uriTwo.getHost()).port(uriTwo.getPort()).scheme(
+                                uriTwo.getScheme()).build();
+                        paramMap.put("restapiUrl", retryUri.toString());
+                        log.debug("URL was set to {}", retryUri.toString());
+                        log.debug("Failed to communicate with host {}. Request will be re-attempted using the host {}.",
+                                  hostname, retryString);
+                        log.debug("This is retry attempt {} out of {}", retryCount, retryPolicy.getMaximumRetries());
+                        sendRequest(paramMap, ctx, retryCount);
+                    } else {
+                        log.debug("Maximum retries reached, calling setFailureResponseStatus.");
+                        setFailureResponseStatus(ctx, prefix, e.getMessage(), r);
+                    }
+                } catch (Exception ex) {
+                    log.error("Could not attempt retry.", ex);
+                    String retryErrorMessage =
+                            "Retry attempt has failed. No further retry shall be attempted, calling " +
+                                    "setFailureResponseStatus.";
+                    setFailureResponseStatus(ctx, prefix, retryErrorMessage, r);
+                }
+            }
+        }
+
+        if (r != null && r.code >= 300) {
+            throw new Exception(String.valueOf(r.code) + ": " + r.message);
+        }
+    }
+
+    protected Parameters getParameters(Map<String, String> paramMap) throws Exception {
+        Parameters p = new Parameters();
+        p.templateFileName = parseParam(paramMap, "templateFileName", false, null);
+        p.requestBody = parseParam(paramMap, "requestBody", false, null);
+        p.restapiUrl = parseParam(paramMap, "restapiUrl", true, null);
+        validateUrl(p.restapiUrl);
+        p.restapiUser = parseParam(paramMap, "restapiUser", false, null);
+        p.restapiPassword = parseParam(paramMap, "restapiPassword", false, null);
+        p.oAuthConsumerKey = parseParam(paramMap, "oAuthConsumerKey", false, null);
+        p.oAuthConsumerSecret = parseParam(paramMap, "oAuthConsumerSecret", false, null);
+        p.oAuthSignatureMethod = parseParam(paramMap, "oAuthSignatureMethod", false, null);
+        p.oAuthVersion = parseParam(paramMap, "oAuthVersion", false, null);
+        p.contentType = parseParam(paramMap, "contentType", false, null);
+        p.format = Format.fromString(parseParam(paramMap, "format", false, "json"));
+        p.authtype = AuthType.fromString(parseParam(paramMap, "authType", false, "unspecified"));
+        p.httpMethod = HttpMethod.fromString(parseParam(paramMap, "httpMethod", false, "post"));
+        p.responsePrefix = parseParam(paramMap, "responsePrefix", false, null);
+        p.listNameList = getListNameList(paramMap);
+        String skipSendingStr = paramMap.get("skipSending");
+        p.skipSending = "true".equalsIgnoreCase(skipSendingStr);
+        p.convertResponse = Boolean.valueOf(parseParam(paramMap, "convertResponse", false, "true"));
+        p.trustStoreFileName = parseParam(paramMap, "trustStoreFileName", false, null);
+        p.trustStorePassword = parseParam(paramMap, "trustStorePassword", false, null);
+        p.keyStoreFileName = parseParam(paramMap, "keyStoreFileName", false, null);
+        p.keyStorePassword = parseParam(paramMap, "keyStorePassword", false, null);
+        p.ssl = p.trustStoreFileName != null && p.trustStorePassword != null && p.keyStoreFileName != null &&
+                p.keyStorePassword != null;
+        p.customHttpHeaders = parseParam(paramMap, "customHttpHeaders", false, null);
+        p.partner = parseParam(paramMap, "partner", false, null);
+        p.dumpHeaders = Boolean.valueOf(parseParam(paramMap, "dumpHeaders", false, null));
+        p.returnRequestPayload = Boolean.valueOf(parseParam(paramMap, "returnRequestPayload", false, null));
+        return p;
+    }
+
+    private void validateUrl(String restapiUrl) throws Exception {
+        try {
+            URI.create(restapiUrl);
+        } catch (IllegalArgumentException e) {
+            throw new Exception("Invalid input of url " + e.getLocalizedMessage(), e);
+        }
+    }
+
+    protected Set<String> getListNameList(Map<String, String> paramMap) {
+        Set<String> ll = new HashSet<>();
+        for (Map.Entry<String, String> entry : paramMap.entrySet())
+            if (entry.getKey().startsWith("listName")) {
+                ll.add(entry.getValue());
+            }
+        return ll;
+    }
+
+    protected String parseParam(Map<String, String> paramMap, String name, boolean required, String def)
+            throws Exception {
+        String s = paramMap.get(name);
+
+        if (s == null || s.trim().length() == 0) {
+            if (!required) {
+                return def;
+            }
+            throw new Exception("Parameter " + name + " is required in RestapiCallNode");
+        }
+
+        s = s.trim();
+        StringBuilder value = new StringBuilder();
+        int i = 0;
+        int i1 = s.indexOf('%');
+        while (i1 >= 0) {
+            int i2 = s.indexOf('%', i1 + 1);
+            if (i2 < 0) {
+                break;
+            }
+
+            String varName = s.substring(i1 + 1, i2);
+            String varValue = System.getenv(varName);
+            if (varValue == null) {
+                varValue = "%" + varName + "%";
+            }
+
+            value.append(s.substring(i, i1));
+            value.append(varValue);
+
+            i = i2 + 1;
+            i1 = s.indexOf('%', i);
+        }
+        value.append(s.substring(i));
+
+        log.info("Parameter {}: [{}]", name, value);
+        return value.toString();
+    }
+
+    protected String buildXmlJsonRequest(RestConfContext ctx, String template, Format format) throws Exception {
+        log.info("Building {} started", format);
+        long t1 = System.currentTimeMillis();
+
+        template = expandRepeats(ctx, template, 1);
+
+        Map<String, String> mm = new HashMap<>();
+        for (String s : ctx.getAttributeKeySet())
+            mm.put(s, ctx.getAttribute(s));
+        StringBuilder ss = new StringBuilder();
+        int i = 0;
+        while (i < template.length()) {
+            int i1 = template.indexOf("${", i);
+            if (i1 < 0) {
+                ss.append(template.substring(i));
+                break;
+            }
+
+            int i2 = template.indexOf('}', i1 + 2);
+            if (i2 < 0) {
+                throw new Exception("Template error: Matching } not found");
+            }
+
+            String var1 = template.substring(i1 + 2, i2);
+            String value1 = format == Format.XML ? XmlJsonUtil.getXml(mm, var1) : XmlJsonUtil.getJson(mm, var1);
+            // log.info(" " + var1 + ": " + value1);
+            if (value1 == null || value1.trim().length() == 0) {
+                // delete the whole element (line)
+                int i3 = template.lastIndexOf('\n', i1);
+                if (i3 < 0) {
+                    i3 = 0;
+                }
+                int i4 = template.indexOf('\n', i1);
+                if (i4 < 0) {
+                    i4 = template.length();
+                }
+
+                if (i < i3) {
+                    ss.append(template.substring(i, i3));
+                }
+                i = i4;
+            } else {
+                ss.append(template.substring(i, i1)).append(value1);
+                i = i2 + 1;
+            }
+        }
+
+        String req = format == Format.XML
+                ? XmlJsonUtil.removeEmptyStructXml(ss.toString()) : XmlJsonUtil.removeEmptyStructJson(ss.toString());
+
+        if (format == Format.JSON) {
+            req = XmlJsonUtil.removeLastCommaJson(req);
+        }
+
+        long t2 = System.currentTimeMillis();
+        log.info("Building {} completed. Time: {}", format, (t2 - t1));
+
+        return req;
+    }
+
+    protected String expandRepeats(RestConfContext ctx, String template, int level) throws Exception {
+        StringBuilder newTemplate = new StringBuilder();
+        int k = 0;
+        while (k < template.length()) {
+            int i1 = template.indexOf("${repeat:", k);
+            if (i1 < 0) {
+                newTemplate.append(template.substring(k));
+                break;
+            }
+
+            int i2 = template.indexOf(':', i1 + 9);
+            if (i2 < 0) {
+                throw new Exception(
+                        "Template error: Context variable name followed by : is required after repeat");
+            }
+
+            // Find the closing }, store in i3
+            int nn = 1;
+            int i3 = -1;
+            int i = i2;
+            while (nn > 0 && i < template.length()) {
+                i3 = template.indexOf('}', i);
+                if (i3 < 0) {
+                    throw new Exception("Template error: Matching } not found");
+                }
+                int i32 = template.indexOf('{', i);
+                if (i32 >= 0 && i32 < i3) {
+                    nn++;
+                    i = i32 + 1;
+                } else {
+                    nn--;
+                    i = i3 + 1;
+                }
+            }
+
+            String var1 = template.substring(i1 + 9, i2);
+            String value1 = ctx.getAttribute(var1);
+            log.info("     {}:{}", var1, value1);
+            int n = 0;
+            try {
+                n = Integer.parseInt(value1);
+            } catch (NumberFormatException e) {
+                log.info("value1 not set or not a number, n will remain set at zero");
+            }
+
+            newTemplate.append(template.substring(k, i1));
+
+            String rpt = template.substring(i2 + 1, i3);
+
+            for (int ii = 0; ii < n; ii++) {
+                String ss = rpt.replaceAll("\\[\\$\\{" + level + "\\}\\]", "[" + ii + "]");
+                if (ii == n - 1 && ss.trim().endsWith(",")) {
+                    int i4 = ss.lastIndexOf(',');
+                    if (i4 > 0) {
+                        ss = ss.substring(0, i4) + ss.substring(i4 + 1);
+                    }
+                }
+                newTemplate.append(ss);
+            }
+
+            k = i3 + 1;
+        }
+
+        if (k == 0) {
+            return newTemplate.toString();
+        }
+
+        return expandRepeats(ctx, newTemplate.toString(), level + 1);
+    }
+
+    protected String readFile(String fileName) throws Exception {
+        try {
+            byte[] encoded = Files.readAllBytes(Paths.get(fileName));
+            return new String(encoded, "UTF-8");
+        } catch (IOException | SecurityException e) {
+            throw new Exception("Unable to read file " + fileName + e.getLocalizedMessage(), e);
+        }
+    }
+
+    protected Client addAuthType(Client client, Parameters p) throws Exception {
+        if (p.authtype == AuthType.Unspecified) {
+            if (p.restapiUser != null && p.restapiPassword != null) {
+                client.addFilter(new HTTPBasicAuthFilter(p.restapiUser, p.restapiPassword));
+            } else if (p.oAuthConsumerKey != null && p.oAuthConsumerSecret != null
+                    && p.oAuthSignatureMethod != null) {
+                OAuthParameters params = new OAuthParameters()
+                        .signatureMethod(p.oAuthSignatureMethod)
+                        .consumerKey(p.oAuthConsumerKey)
+                        .version(p.oAuthVersion);
+
+                OAuthSecrets secrets = new OAuthSecrets()
+                        .consumerSecret(p.oAuthConsumerSecret);
+                client.addFilter(new OAuthClientFilter(client.getProviders(), params, secrets));
+            }
+        } else {
+            if (p.authtype == AuthType.DIGEST) {
+                if (p.restapiUser != null && p.restapiPassword != null) {
+                    client.addFilter(new HTTPDigestAuthFilter(p.restapiUser, p.restapiPassword));
+                } else {
+                    throw new Exception("oAUTH authentication type selected but all restapiUser and restapiPassword " +
+                                                "parameters doesn't exist", new Throwable());
+                }
+            } else if (p.authtype == AuthType.BASIC) {
+                if (p.restapiUser != null && p.restapiPassword != null) {
+                    client.addFilter(new HTTPBasicAuthFilter(p.restapiUser, p.restapiPassword));
+                } else {
+                    throw new Exception("oAUTH authentication type selected but all restapiUser and restapiPassword " +
+                                                "parameters doesn't exist", new Throwable());
+                }
+            } else if (p.authtype == AuthType.OAUTH) {
+                if (p.oAuthConsumerKey != null && p.oAuthConsumerSecret != null && p.oAuthSignatureMethod != null) {
+                    OAuthParameters params = new OAuthParameters()
+                            .signatureMethod(p.oAuthSignatureMethod)
+                            .consumerKey(p.oAuthConsumerKey)
+                            .version(p.oAuthVersion);
+
+                    OAuthSecrets secrets = new OAuthSecrets()
+                            .consumerSecret(p.oAuthConsumerSecret);
+                    client.addFilter(new OAuthClientFilter(client.getProviders(), params, secrets));
+                } else {
+                    throw new Exception("oAUTH authentication type selected but all oAuthConsumerKey, oAuthConsumerSecret " +
+                                                "and oAuthSignatureMethod parameters doesn't exist", new Throwable());
+                }
+            }
+        }
+        return client;
+    }
+
+    protected HttpResponse sendHttpRequest(String request, Parameters p) throws Exception {
+
+        ClientConfig config = new DefaultClientConfig();
+        SSLContext ssl = null;
+        if (p.ssl && p.restapiUrl.startsWith("https")) {
+            ssl = createSSLContext(p);
+        }
+        if (ssl != null) {
+            HostnameVerifier hostnameVerifier = (hostname, session) -> true;
+
+            config.getProperties().put(HTTPSProperties.PROPERTY_HTTPS_PROPERTIES,
+                                       new HTTPSProperties(hostnameVerifier, ssl));
+        }
+
+        logProperties(config.getProperties());
+
+        Client client = Client.create(config);
+        client.setConnectTimeout(5000);
+        WebResource webResource = addAuthType(client, p).resource(p.restapiUrl);
+
+        log.info("Sending request:");
+        log.info(request);
+        long t1 = System.currentTimeMillis();
+
+        HttpResponse r = new HttpResponse();
+        r.code = 200;
+
+        if (!p.skipSending) {
+            String tt = p.format == Format.XML ? "application/xml" : "application/json";
+            String tt1 = tt + ";charset=UTF-8";
+            if (p.contentType != null) {
+                tt = p.contentType;
+                tt1 = p.contentType;
+            }
+
+            WebResource.Builder webResourceBuilder = webResource.accept(tt).type(tt1);
+            if (p.format == Format.NONE) {
+                webResourceBuilder = webResource.header("", "");
+            }
+
+            if (p.customHttpHeaders != null && p.customHttpHeaders.length() > 0) {
+                String[] keyValuePairs = p.customHttpHeaders.split(",");
+                for (String singlePair : keyValuePairs) {
+                    int equalPosition = singlePair.indexOf('=');
+                    webResourceBuilder.header(singlePair.substring(0, equalPosition),
+                                              singlePair.substring(equalPosition + 1, singlePair.length()));
+                }
+            }
+
+            webResourceBuilder.header("X-ECOMP-RequestID", org.slf4j.MDC.get("X-ECOMP-RequestID"));
+
+            ClientResponse response;
+
+            try {
+                response = webResourceBuilder.method(p.httpMethod.toString(), ClientResponse.class, request);
+            } catch (UniformInterfaceException | ClientHandlerException e) {
+                throw new Exception("Exception while sending http request to client "
+                                            + e.getLocalizedMessage(), e);
+            }
+
+            r.code = response.getStatus();
+            r.headers = response.getHeaders();
+            EntityTag etag = response.getEntityTag();
+            if (etag != null) {
+                r.message = etag.getValue();
+            }
+            if (response.hasEntity() && r.code != 204) {
+                r.body = response.getEntity(String.class);
+            }
+        }
+
+        long t2 = System.currentTimeMillis();
+        log.info("Response received. Time: {}", (t2 - t1));
+        log.info("HTTP response code: {}", r.code);
+        log.info("HTTP response message: {}", r.message);
+        logHeaders(r.headers);
+        log.info("HTTP response: {}", r.body);
+
+        return r;
+    }
+
+    protected void setFailureResponseStatus(RestConfContext ctx, String prefix, String errorMessage,
+                                            HttpResponse resp) {
+        resp.code = 500;
+        resp.message = errorMessage;
+        String pp = prefix != null ? prefix + '.' : "";
+        ctx.setAttribute(pp + "response-code", String.valueOf(resp.code));
+        ctx.setAttribute(pp + "response-message", resp.message);
+    }
+
+    protected void setResponseStatus(RestConfContext ctx, String prefix, HttpResponse r) {
+        String pp = prefix != null ? prefix + '.' : "";
+        ctx.setAttribute(pp + "response-code", String.valueOf(r.code));
+        ctx.setAttribute(pp + "response-message", r.message);
+    }
+
+    protected SSLContext createSSLContext(Parameters p) {
+        try (FileInputStream in = new FileInputStream(p.keyStoreFileName)) {
+            System.setProperty("jsse.enableSNIExtension", "false");
+            System.setProperty("javax.net.ssl.trustStore", p.trustStoreFileName);
+            System.setProperty("javax.net.ssl.trustStorePassword", p.trustStorePassword);
+
+            HttpsURLConnection.setDefaultHostnameVerifier((string, ssls) -> true);
+
+            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
+            KeyStore ks = KeyStore.getInstance("PKCS12");
+            char[] pwd = p.keyStorePassword.toCharArray();
+            ks.load(in, pwd);
+            kmf.init(ks, pwd);
+
+            SSLContext ctx = SSLContext.getInstance("TLS");
+            ctx.init(kmf.getKeyManagers(), null, null);
+            return ctx;
+        } catch (Exception e) {
+            log.error("Error creating SSLContext: {}", e.getMessage(), e);
+        }
+        return null;
+    }
+
+    protected void logProperties(Map<String, Object> mm) {
+        List<String> ll = new ArrayList<>();
+        for (Object o : mm.keySet())
+            ll.add((String) o);
+        Collections.sort(ll);
+
+        log.info("Properties:");
+        for (String name : ll)
+            log.info("--- {}:{}", name, String.valueOf(mm.get(name)));
+    }
+
+    protected void logHeaders(MultivaluedMap<String, String> mm) {
+        log.info("HTTP response headers:");
+
+        if (mm == null) {
+            return;
+        }
+
+        List<String> ll = new ArrayList<>();
+        for (Object o : mm.keySet())
+            ll.add((String) o);
+        Collections.sort(ll);
+
+        for (String name : ll)
+            log.info("--- {}:{}", name, String.valueOf(mm.get(name)));
+    }
+
+    private static class FileParam {
+
+        public String fileName;
+        public String url;
+        public String user;
+        public String password;
+        public HttpMethod httpMethod;
+        public String responsePrefix;
+        public boolean skipSending;
+        public String oAuthConsumerKey;
+        public String oAuthConsumerSecret;
+        public String oAuthSignatureMethod;
+        public String oAuthVersion;
+        public AuthType authtype;
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RetryException.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryException.java
new file mode 100755
index 0000000..91c0a9c
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryException.java
@@ -0,0 +1,27 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+public class RetryException extends Exception {
+    public RetryException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicy.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicy.java
new file mode 100755
index 0000000..7bc0759
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicy.java
@@ -0,0 +1,58 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+public class RetryPolicy {
+    private String[] hostnames;
+    private Integer maximumRetries;
+
+    public Integer getMaximumRetries() {
+        return maximumRetries;
+    }
+
+    public String getNextHostName(String uri) throws RetryException {
+        Integer position = null;
+
+        for (int i = 0; i < hostnames.length; i++) {
+            if (uri.contains(hostnames[i])) {
+                position = i;
+                break;
+            }
+        }
+
+        if (position == null) {
+            throw new RetryException("No match found for the provided uri[" + uri + "] " +
+                                             "so the next host name could not be retreived");
+        }
+        position++;
+
+        if (position > hostnames.length - 1) {
+            position = 0;
+        }
+        return hostnames[position];
+    }
+
+    public RetryPolicy(String[] hostnames, Integer maximumRetries) {
+        this.hostnames = hostnames;
+        this.maximumRetries = maximumRetries;
+    }
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicyStore.java b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicyStore.java
new file mode 100755
index 0000000..10b0e00
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/RetryPolicyStore.java
@@ -0,0 +1,53 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+
+public class RetryPolicyStore {
+    private static final Logger log = LoggerFactory.getLogger(RetryPolicyStore.class);
+
+    HashMap<String, RetryPolicy> retryPolicies;
+    public String proxyServers;
+
+    public String getProxyServers() {
+        return proxyServers;
+    }
+
+    public void setProxyServers(String admServers) {
+        this.proxyServers = admServers;
+        String[] adminServersArray = admServers.split(",");
+        RetryPolicy adminPortalRetry = new RetryPolicy(adminServersArray, adminServersArray.length);
+        retryPolicies.put("dme2proxy", adminPortalRetry);
+    }
+
+    public RetryPolicyStore() {
+        retryPolicies = new HashMap<>();
+    }
+
+    public RetryPolicy getRetryPolicy(String policyName) {
+        return (this.retryPolicies.get(policyName));
+    }
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/XmlJsonUtil.java b/src/main/java/org/onap/dcae/collectors/restconf/common/XmlJsonUtil.java
new file mode 100755
index 0000000..382ef4d
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/XmlJsonUtil.java
@@ -0,0 +1,412 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class XmlJsonUtil {
+
+    private static final Logger log = LoggerFactory.getLogger(XmlJsonUtil.class);
+
+    private XmlJsonUtil() {
+        // Preventing instantiation of the same.
+    }
+
+    public static String getXml(Map<String, String> varmap, String var) {
+        boolean escape = true;
+        if (var.startsWith("'")) {
+            var = var.substring(1);
+            escape = false;
+        }
+
+        Object o = createStructure(varmap, var);
+        return generateXml(o, 0, escape);
+    }
+
+    public static String getJson(Map<String, String> varmap, String var) {
+        boolean escape = true;
+        if (var.startsWith("'")) {
+            var = var.substring(1);
+            escape = false;
+        }
+
+        boolean quotes = true;
+        if (var.startsWith("\"")) {
+            var = var.substring(1);
+            quotes = false;
+        }
+
+        Object o = createStructure(varmap, var);
+        return generateJson(o, escape, quotes);
+    }
+
+    private static Object createStructure(Map<String, String> flatmap, String var) {
+        if (flatmap.containsKey(var)) {
+            if (var.endsWith("_length") || var.endsWith("].key")) {
+                return null;
+            }
+            return flatmap.get(var);
+        }
+
+        Map<String, Object> mm = new HashMap<>();
+        for (String k : flatmap.keySet())
+            if (k.startsWith(var + ".")) {
+                int i1 = k.indexOf('.', var.length() + 1);
+                int i2 = k.indexOf('[', var.length() + 1);
+                int i3 = k.length();
+                if (i1 > 0 && i1 < i3) {
+                    i3 = i1;
+                }
+                if (i2 > 0 && i2 < i3) {
+                    i3 = i2;
+                }
+                String k1 = k.substring(var.length() + 1, i3);
+                String var1 = k.substring(0, i3);
+                if (!mm.containsKey(k1)) {
+                    Object str = createStructure(flatmap, var1);
+                    if (str != null && (!(str instanceof String) || ((String) str).trim().length() > 0)) {
+                        mm.put(k1, str);
+                    }
+                }
+            }
+        if (!mm.isEmpty()) {
+            return mm;
+        }
+
+        boolean arrayFound = false;
+        for (String k : flatmap.keySet())
+            if (k.startsWith(var + "[")) {
+                arrayFound = true;
+                break;
+            }
+
+        if (arrayFound) {
+            List<Object> ll = new ArrayList<>();
+
+            int length = Integer.MAX_VALUE;
+            String lengthStr = flatmap.get(var + "_length");
+            if (lengthStr != null) {
+                try {
+                    length = Integer.parseInt(lengthStr);
+                } catch (Exception e) {
+                    log.warn("Invalid number for {}_length:{}", var, lengthStr, e);
+                }
+            }
+
+            for (int i = 0; i < length; i++) {
+                Object v = createStructure(flatmap, var + '[' + i + ']');
+                if (v == null) {
+                    break;
+                }
+                ll.add(v);
+            }
+
+            if (!ll.isEmpty()) {
+                return ll;
+            }
+        }
+
+        return null;
+    }
+
+    @SuppressWarnings("unchecked")
+    private static String generateXml(Object o, int indent, boolean escape) {
+        if (o == null) {
+            return null;
+        }
+
+        if (o instanceof String) {
+            return escape ? escapeXml((String) o) : (String) o;
+        }
+        ;
+
+        if (o instanceof Map) {
+            StringBuilder ss = new StringBuilder();
+            Map<String, Object> mm = (Map<String, Object>) o;
+            for (Map.Entry<String, Object> entry : mm.entrySet()) {
+                Object v = entry.getValue();
+                String key = entry.getKey();
+                if (v instanceof String) {
+                    String s = escape ? escapeXml((String) v) : (String) v;
+                    ss.append(pad(indent)).append('<').append(key).append('>');
+                    ss.append(s);
+                    ss.append("</").append(key).append('>').append('\n');
+                } else if (v instanceof Map) {
+                    ss.append(pad(indent)).append('<').append(key).append('>').append('\n');
+                    ss.append(generateXml(v, indent + 1, escape));
+                    ss.append(pad(indent)).append("</").append(key).append('>').append('\n');
+                } else if (v instanceof List) {
+                    List<Object> ll = (List<Object>) v;
+                    for (Object o1 : ll) {
+                        ss.append(pad(indent)).append('<').append(key).append('>').append('\n');
+                        ss.append(generateXml(o1, indent + 1, escape));
+                        ss.append(pad(indent)).append("</").append(key).append('>').append('\n');
+                    }
+                }
+            }
+            return ss.toString();
+        }
+
+        return null;
+    }
+
+    private static String generateJson(Object o, boolean escape, boolean quotes) {
+        if (o == null) {
+            return null;
+        }
+
+        StringBuilder ss = new StringBuilder();
+        generateJson(ss, o, 0, false, escape, quotes);
+        return ss.toString();
+    }
+
+    @SuppressWarnings("unchecked")
+    private static void generateJson(StringBuilder ss, Object o, int indent, boolean padFirst, boolean escape, boolean quotes) {
+        if (o instanceof String) {
+            String s = escape ? escapeJson((String) o) : (String) o;
+            if (padFirst) {
+                ss.append(pad(indent));
+            }
+            if (quotes) {
+                ss.append('"').append(s).append('"');
+            } else {
+                ss.append(s);
+            }
+            return;
+        }
+
+        if (o instanceof Map) {
+            Map<String, Object> mm = (Map<String, Object>) o;
+
+            if (padFirst) {
+                ss.append(pad(indent));
+            }
+            ss.append("{\n");
+
+            boolean first = true;
+            for (Map.Entry<String, Object> entry : mm.entrySet()) {
+                if (!first) {
+                    ss.append(",\n");
+                }
+                first = false;
+                Object v = entry.getValue();
+                String key = entry.getKey();
+                ss.append(pad(indent + 1)).append('"').append(key).append("\": ");
+                generateJson(ss, v, indent + 1, false, escape, true);
+            }
+
+            ss.append("\n");
+            ss.append(pad(indent)).append('}');
+
+            return;
+        }
+
+        if (o instanceof List) {
+            List<Object> ll = (List<Object>) o;
+
+            if (padFirst) {
+                ss.append(pad(indent));
+            }
+            ss.append("[\n");
+
+            boolean first = true;
+            for (Object o1 : ll) {
+                if (!first) {
+                    ss.append(",\n");
+                }
+                first = false;
+
+                generateJson(ss, o1, indent + 1, true, escape, quotes);
+            }
+
+            ss.append("\n");
+            ss.append(pad(indent)).append(']');
+        }
+    }
+
+    public static String removeLastCommaJson(String s) {
+        StringBuilder sb = new StringBuilder();
+        int k = 0;
+        int start = 0;
+        while (k < s.length()) {
+            int i11 = s.indexOf('}', k);
+            int i12 = s.indexOf(']', k);
+            int i1 = -1;
+            if (i11 < 0) {
+                i1 = i12;
+            } else if (i12 < 0) {
+                i1 = i11;
+            } else {
+                i1 = i11 < i12 ? i11 : i12;
+            }
+            if (i1 < 0) {
+                break;
+            }
+
+            int i2 = s.lastIndexOf(',', i1);
+            if (i2 < 0) {
+                k = i1 + 1;
+                continue;
+            }
+
+            String between = s.substring(i2 + 1, i1);
+            if (between.trim().length() > 0) {
+                k = i1 + 1;
+                continue;
+            }
+
+            sb.append(s.substring(start, i2));
+            start = i2 + 1;
+            k = i1 + 1;
+        }
+
+        sb.append(s.substring(start, s.length()));
+
+        return sb.toString();
+    }
+
+    public static String removeEmptyStructJson(String s) {
+        int k = 0;
+        while (k < s.length()) {
+            boolean curly = true;
+            int i11 = s.indexOf('{', k);
+            int i12 = s.indexOf('[', k);
+            int i1 = -1;
+            if (i11 < 0) {
+                i1 = i12;
+                curly = false;
+            } else if (i12 < 0) {
+                i1 = i11;
+            } else if (i11 < i12) {
+                i1 = i11;
+            } else {
+                i1 = i12;
+                curly = false;
+            }
+
+            if (i1 >= 0) {
+                int i2 = curly ? s.indexOf('}', i1) : s.indexOf(']', i1);
+                if (i2 > 0) {
+                    String value = s.substring(i1 + 1, i2);
+                    if (value.trim().length() == 0) {
+                        int i4 = s.lastIndexOf('\n', i1);
+                        if (i4 < 0) {
+                            i4 = 0;
+                        }
+                        int i5 = s.indexOf('\n', i2);
+                        if (i5 < 0) {
+                            i5 = s.length();
+                        }
+
+                        s = s.substring(0, i4) + s.substring(i5);
+                        k = 0;
+                    } else {
+                        k = i1 + 1;
+                    }
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+
+        return s;
+    }
+
+    public static String removeEmptyStructXml(String s) {
+        int k = 0;
+        while (k < s.length()) {
+            int i1 = s.indexOf('<', k);
+            if (i1 < 0 || i1 == s.length() - 1) {
+                break;
+            }
+
+            char c1 = s.charAt(i1 + 1);
+            if (c1 == '?' || c1 == '!') {
+                k = i1 + 2;
+                continue;
+            }
+
+            int i2 = s.indexOf('>', i1);
+            if (i2 < 0) {
+                k = i1 + 1;
+                continue;
+            }
+
+            String closingTag = "</" + s.substring(i1 + 1, i2 + 1);
+            int i3 = s.indexOf(closingTag, i2 + 1);
+            if (i3 < 0) {
+                k = i2 + 1;
+                continue;
+            }
+
+            String value = s.substring(i2 + 1, i3);
+            if (value.trim().length() > 0) {
+                k = i2 + 1;
+                continue;
+            }
+
+            int i4 = s.lastIndexOf('\n', i1);
+            if (i4 < 0) {
+                i4 = 0;
+            }
+            int i5 = s.indexOf('\n', i3);
+            if (i5 < 0) {
+                i5 = s.length();
+            }
+
+            s = s.substring(0, i4) + s.substring(i5);
+            k = 0;
+        }
+
+        return s;
+    }
+
+    private static String escapeXml(String v) {
+        String s = v.replaceAll("&", "&amp;");
+        s = s.replaceAll("<", "&lt;");
+        s = s.replaceAll("'", "&apos;");
+        s = s.replaceAll("\"", "&quot;");
+        s = s.replaceAll(">", "&gt;");
+        return s;
+    }
+
+    private static String escapeJson(String v) {
+        String s = v.replaceAll("\\\\", "\\\\\\\\");
+        s = s.replaceAll("\"", "\\\\\"");
+        return s;
+    }
+
+    private static String pad(int n) {
+        StringBuilder s = new StringBuilder();
+        for (int i = 0; i < n; i++)
+            s.append(Character.toString('\t'));
+        return s.toString();
+    }
+}
+
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/XmlParser.java b/src/main/java/org/onap/dcae/collectors/restconf/common/XmlParser.java
new file mode 100755
index 0000000..e073cd6
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/XmlParser.java
@@ -0,0 +1,178 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class XmlParser {
+
+    private static final Logger log = LoggerFactory.getLogger(XmlParser.class);
+
+    private XmlParser() {
+        // Preventing instantiation of the same.
+    }
+
+    public static Map<String, String> convertToProperties(String s, Set<String> listNameList)
+            throws Exception {
+
+        checkNotNull(s, "Input should not be null.");
+
+        Handler handler = new Handler(listNameList);
+        try {
+            SAXParserFactory factory = SAXParserFactory.newInstance();
+            SAXParser saxParser = factory.newSAXParser();
+            InputStream in = new ByteArrayInputStream(s.getBytes());
+            saxParser.parse(in, handler);
+        } catch (ParserConfigurationException | IOException | SAXException | NumberFormatException e) {
+            throw new Exception("Unable to convert XML to properties" + e.getLocalizedMessage(), e);
+        }
+        return handler.getProperties();
+    }
+
+    private static class Handler extends DefaultHandler {
+
+        private Set<String> listNameList;
+
+        private Map<String, String> properties = new HashMap<>();
+
+        public Map<String, String> getProperties() {
+            return properties;
+        }
+
+        public Handler(Set<String> listNameList) {
+            super();
+            this.listNameList = listNameList;
+            if (this.listNameList == null) {
+                this.listNameList = new HashSet<>();
+            }
+        }
+
+        StringBuilder currentName = new StringBuilder();
+        StringBuilder currentValue = new StringBuilder();
+
+        @Override
+        public void startElement(String uri, String localName, String qName, Attributes attributes)
+                throws SAXException {
+            super.startElement(uri, localName, qName, attributes);
+
+            String name = localName;
+            if (name == null || name.trim().length() == 0) {
+                name = qName;
+            }
+            int i2 = name.indexOf(':');
+            if (i2 >= 0) {
+                name = name.substring(i2 + 1);
+            }
+
+            if (currentName.length() > 0) {
+                currentName.append(Character.toString('.'));
+            }
+            currentName.append(name);
+
+            String listName = removeIndexes(currentName.toString());
+
+            if (listNameList.contains(listName)) {
+                String n = currentName.toString() + "_length";
+                int len = getInt(properties, n);
+                properties.put(n, String.valueOf(len + 1));
+                currentName.append("[").append(len).append("]");
+            }
+        }
+
+        @Override
+        public void endElement(String uri, String localName, String qName) throws SAXException {
+            super.endElement(uri, localName, qName);
+
+            String name = localName;
+            if (name == null || name.trim().length() == 0) {
+                name = qName;
+            }
+            int i2 = name.indexOf(':');
+            if (i2 >= 0) {
+                name = name.substring(i2 + 1);
+            }
+
+            String s = currentValue.toString().trim();
+            if (s.length() > 0) {
+                properties.put(currentName.toString(), s);
+
+                log.info("Added property: {} : {}", currentName, s);
+                currentValue = new StringBuilder();
+            }
+
+            int i1 = currentName.lastIndexOf("." + name);
+            if (i1 <= 0) {
+                currentName = new StringBuilder();
+            } else {
+                currentName = new StringBuilder(currentName.substring(0, i1));
+            }
+        }
+
+        @Override
+        public void characters(char[] ch, int start, int length) throws SAXException {
+            super.characters(ch, start, length);
+
+            String value = new String(ch, start, length);
+            currentValue.append(value);
+        }
+
+        private static int getInt(Map<String, String> mm, String name) {
+            String s = mm.get(name);
+            if (s == null) {
+                return 0;
+            }
+            return Integer.parseInt(s);
+        }
+
+        private String removeIndexes(String currentName) {
+            StringBuilder b = new StringBuilder();
+            boolean add = true;
+            for (int i = 0; i < currentName.length(); i++) {
+                char c = currentName.charAt(i);
+                if (c == '[') {
+                    add = false;
+                } else if (c == ']') {
+                    add = true;
+                } else if (add) {
+                    b.append(Character.toString(c));
+                }
+            }
+            return b.toString();
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPConfigurationParser.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPConfigurationParser.java
new file mode 100755
index 0000000..04271e4
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPConfigurationParser.java
@@ -0,0 +1,107 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import io.vavr.collection.List;
+import io.vavr.collection.Map;
+import io.vavr.control.Option;
+import io.vavr.control.Try;
+import org.onap.dcae.collectors.restconf.common.AnyNode;
+
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static io.vavr.API.List;
+import static io.vavr.API.Try;
+import static io.vavr.API.Tuple;
+import static io.vavr.API.unchecked;
+import static org.onap.dcae.collectors.restconf.common.event.publishing.VavrUtils.enhanceError;
+import static org.onap.dcae.collectors.restconf.common.event.publishing.VavrUtils.f;
+
+public class DMaaPConfigurationParser {
+
+    public static Try<Map<String, PublisherConfig>> parseToDomainMapping(Path configLocation) {
+        return readFromFile(configLocation)
+                .flatMap(DMaaPConfigurationParser::toJSON)
+                .flatMap(DMaaPConfigurationParser::toConfigMap);
+    }
+
+    private static Try<String> readFromFile(Path configLocation) {
+        return Try(() -> new String(Files.readAllBytes(configLocation)))
+                .mapFailure(enhanceError(f("Could not read DMaaP configuration from location: '%s'", configLocation)));
+    }
+
+    private static Try<AnyNode> toJSON(String config) {
+        return Try(() -> AnyNode.fromString(config))
+                .mapFailure(enhanceError(f("DMaaP configuration '%s' is not a valid JSON document", config)));
+    }
+
+    private static Try<Map<String, PublisherConfig>> toConfigMap(AnyNode config) {
+        return Try(() -> usesLegacyFormat(config) ? parseLegacyFormat(config) : parseNewFormat(config))
+                .mapFailure(enhanceError(
+                        f("Parsing DMaaP configuration: '%s' failed, probably it is in unexpected format", config)));
+    }
+
+    private static boolean usesLegacyFormat(AnyNode dMaaPConfig) {
+        return dMaaPConfig.has("channels");
+    }
+
+    private static Map<String, PublisherConfig> parseLegacyFormat(AnyNode root) {
+        return root.get("channels").toList().toMap(
+                channel -> channel.get("name").toString(),
+                channel -> {
+                    String destinationsStr = channel.getAsOption("cambria.url")
+                            .getOrElse(channel.getAsOption("cambria.hosts").get())
+                            .toString();
+                    String topic = channel.get("cambria.topic").toString();
+                    Option<String> maybeUser = channel.getAsOption("basicAuthUsername").map(AnyNode::toString);
+                    Option<String> maybePassword = channel.getAsOption("basicAuthPassword").map(AnyNode::toString);
+                    List<String> destinations = List(destinationsStr.split(","));
+                    return buildBasedOnAuth(maybeUser, maybePassword, topic, destinations);
+                });
+    }
+
+    private static Map<String, PublisherConfig> parseNewFormat(AnyNode root) {
+        return root.keys().toMap(
+                channelName -> channelName,
+                channelName -> {
+                    AnyNode channelConfig = root.get(channelName);
+                    Option<String> maybeUser = channelConfig.getAsOption("aaf_username").map(AnyNode::toString);
+                    Option<String> maybePassword = channelConfig.getAsOption("aaf_password").map(AnyNode::toString);
+                    URL topicURL = unchecked(
+                            () -> new URL(channelConfig.get("dmaap_info").get("topic_url").toString())).apply();
+                    String[] pathSegments = topicURL.getPath().substring(1).split("/");
+                    String topic = pathSegments[1];
+                    String destination = "events".equals(pathSegments[0]) ? topicURL.getAuthority() : topicURL.getHost();
+                    List<String> destinations = List(destination);
+                    return buildBasedOnAuth(maybeUser, maybePassword, topic, destinations);
+                });
+    }
+
+    private static PublisherConfig buildBasedOnAuth(Option<String> maybeUser, Option<String> maybePassword,
+                                                    String topic, List<String> destinations) {
+        return maybeUser.flatMap(user -> maybePassword.map(password -> Tuple(user, password)))
+                .map(credentials -> new PublisherConfig(destinations, topic, credentials._1, credentials._2))
+                .getOrElse(new PublisherConfig(destinations, topic));
+    }
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPEventPublisher.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPEventPublisher.java
new file mode 100755
index 0000000..36e950f
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPEventPublisher.java
@@ -0,0 +1,75 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import io.vavr.control.Try;
+import org.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+public class DMaaPEventPublisher implements EventPublisher {
+
+    private static final int PENDING_MESSAGE_LOG_THRESHOLD = 100;
+    private static final Logger log = LoggerFactory.getLogger(DMaaPEventPublisher.class);
+    private final DMaaPPublishersCache publishersCache;
+    private final Logger outputLogger;
+
+    DMaaPEventPublisher(DMaaPPublishersCache DMaaPPublishersCache,
+                        Logger outputLogger) {
+        this.publishersCache = DMaaPPublishersCache;
+        this.outputLogger = outputLogger;
+    }
+
+    @Override
+    public void sendEvent(JSONObject event, String domain) {
+        publishersCache.getPublisher(domain)
+                .onEmpty(() ->
+                                 log.warn(VavrUtils.f("Could not find event publisher for domain: '%s', dropping message: '%s'", domain, event)))
+                .forEach(publisher -> sendEvent(event, domain, publisher));
+    }
+
+    private void sendEvent(JSONObject event, String domain, CambriaBatchingPublisher publisher) {
+        Try.run(() -> uncheckedSendEvent(event, domain, publisher))
+                .onFailure(exc -> closePublisher(event, domain, exc));
+    }
+
+    private void uncheckedSendEvent(JSONObject event, String domain, CambriaBatchingPublisher publisher)
+            throws IOException {
+        System.out.println("printing publisher information" + publisher);
+        int pendingMsgs = publisher.send("MyPartitionKey", event.toString());
+        if (pendingMsgs > PENDING_MESSAGE_LOG_THRESHOLD) {
+            log.info("Pending messages count: " + pendingMsgs);
+        }
+        String infoMsg = VavrUtils.f("Event: '%s' scheduled to be send asynchronously on domain: '%s'", event, domain);
+        log.info(infoMsg);
+        outputLogger.info(infoMsg);
+    }
+
+    private void closePublisher(JSONObject event, String domain, Throwable e) {
+        log.error(VavrUtils.f("Unable to schedule event: '%s' on domain: '%s'. Closing publisher and dropping message.",
+                              event, domain), e);
+        publishersCache.closePublisherFor(domain);
+    }
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersBuilder.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersBuilder.java
new file mode 100755
index 0000000..2f9b3ed
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersBuilder.java
@@ -0,0 +1,63 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import com.att.nsa.cambria.client.CambriaClientBuilders;
+import com.att.nsa.cambria.client.CambriaClientBuilders.PublisherBuilder;
+import io.vavr.control.Try;
+
+import static io.vavr.API.Try;
+import static org.onap.dcae.collectors.restconf.common.event.publishing.VavrUtils.enhanceError;
+import static org.onap.dcae.collectors.restconf.common.event.publishing.VavrUtils.f;
+
+/**
+ * @author Pawel Szalapski (pawel.szalapski@nokia.com)
+ */
+final class DMaaPPublishersBuilder {
+
+    @SuppressWarnings("mapFailure takes a generic varargs, unchecked because of Javas type system limitation, actually safe to do")
+    static Try<CambriaBatchingPublisher> buildPublisher(PublisherConfig config) {
+        return Try(() -> builder(config).build())
+                .mapFailure(enhanceError(f("DMaaP client builder throws exception for this configuration: '%s'", config)));
+    }
+
+    private static PublisherBuilder builder(PublisherConfig config) {
+        if (config.isSecured()) {
+            return authenticatedBuilder(config);
+        } else {
+            return unAuthenticatedBuilder(config);
+        }
+    }
+
+    private static PublisherBuilder authenticatedBuilder(PublisherConfig config) {
+        return unAuthenticatedBuilder(config)
+                .usingHttps()
+                .authenticatedByHttp(config.userName().get(), config.password().get());
+    }
+
+    private static PublisherBuilder unAuthenticatedBuilder(PublisherConfig config) {
+        return new CambriaClientBuilders.PublisherBuilder()
+                .usingHosts(config.destinations().mkString(","))
+                .onTopic(config.topic())
+                .logSendFailuresAfter(5);
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersCache.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersCache.java
new file mode 100755
index 0000000..acad96d
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/DMaaPPublishersCache.java
@@ -0,0 +1,110 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.cache.RemovalListener;
+import com.google.common.cache.RemovalNotification;
+import io.vavr.collection.Map;
+import io.vavr.control.Option;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnull;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static io.vavr.API.Option;
+import static org.onap.dcae.collectors.restconf.common.event.publishing.VavrUtils.f;
+
+public class DMaaPPublishersCache {
+
+    private static final Logger log = LoggerFactory.getLogger(DMaaPPublishersCache.class);
+    private final LoadingCache<String, CambriaBatchingPublisher> publishersCache;
+    private AtomicReference<Map<String, PublisherConfig>> dMaaPConfiguration;
+
+    DMaaPPublishersCache(Map<String, PublisherConfig> dMaaPConfiguration) {
+        this.dMaaPConfiguration = new AtomicReference<>(dMaaPConfiguration);
+        this.publishersCache = CacheBuilder.newBuilder()
+                .removalListener(new OnPublisherRemovalListener())
+                .build(new CambriaPublishersCacheLoader());
+    }
+
+    DMaaPPublishersCache(CambriaPublishersCacheLoader dMaaPPublishersCacheLoader,
+                         OnPublisherRemovalListener onPublisherRemovalListener,
+                         Map<String, PublisherConfig> dMaaPConfiguration) {
+        this.dMaaPConfiguration = new AtomicReference<>(dMaaPConfiguration);
+        this.publishersCache = CacheBuilder.newBuilder()
+                .removalListener(onPublisherRemovalListener)
+                .build(dMaaPPublishersCacheLoader);
+    }
+
+    Option<CambriaBatchingPublisher> getPublisher(String streamID) {
+        try {
+            return Option(publishersCache.getUnchecked(streamID));
+        } catch (Exception e) {
+            log.warn("Could not create / load Cambria Publisher for streamID", e);
+            return Option.none();
+        }
+    }
+
+    void closePublisherFor(String streamId) {
+        publishersCache.invalidate(streamId);
+    }
+
+    static class OnPublisherRemovalListener implements RemovalListener<String, CambriaBatchingPublisher> {
+
+        @Override
+        public void onRemoval(@Nonnull RemovalNotification<String, CambriaBatchingPublisher> notification) {
+            CambriaBatchingPublisher publisher = notification.getValue();
+            if (publisher != null) { // The value might get Garbage Collected at this moment, regardless of @Nonnull
+                try {
+                    int timeout = 20;
+                    TimeUnit unit = TimeUnit.SECONDS;
+                    java.util.List<?> stuck = publisher.close(timeout, unit);
+                    if (!stuck.isEmpty()) {
+                        log.error(f("Publisher got stuck and did not manage to close in '%s' '%s', "
+                                            + "%s messages were dropped", stuck.size(), timeout, unit));
+                    }
+                } catch (InterruptedException | IOException e) {
+                    log.error("Could not close Cambria publisher, some messages might have been dropped", e);
+                }
+            }
+        }
+    }
+
+    class CambriaPublishersCacheLoader extends CacheLoader<String, CambriaBatchingPublisher> {
+
+        @Override
+        public CambriaBatchingPublisher load(@Nonnull String domain) {
+            return dMaaPConfiguration.get()
+                    .get(domain)
+                    .toTry(() -> new RuntimeException(
+                            f("DMaaP configuration contains no configuration for domain: '%s'", domain)))
+                    .flatMap(DMaaPPublishersBuilder::buildPublisher)
+                    .get();
+        }
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/EventPublisher.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/EventPublisher.java
new file mode 100755
index 0000000..3d339b3
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/EventPublisher.java
@@ -0,0 +1,35 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+
+import io.vavr.collection.Map;
+import org.json.JSONObject;
+import org.slf4j.Logger;
+
+public interface EventPublisher {
+
+    static EventPublisher createPublisher(Logger outputLogger, Map<String, PublisherConfig> dMaaPConfig) {
+        return new DMaaPEventPublisher(new DMaaPPublishersCache(dMaaPConfig), outputLogger);
+    }
+
+    void sendEvent(JSONObject event, String domain);
+
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/PublisherConfig.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/PublisherConfig.java
new file mode 100755
index 0000000..33fa15b
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/PublisherConfig.java
@@ -0,0 +1,95 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import io.vavr.collection.List;
+import io.vavr.control.Option;
+
+import java.util.Objects;
+
+public class PublisherConfig {
+    private final List<String> destinations;
+    private final String topic;
+    private String userName;
+    private String password;
+
+    PublisherConfig(List<String> destinations, String topic) {
+        this.destinations = destinations;
+        this.topic = topic;
+    }
+
+    PublisherConfig(List<String> destinations, String topic, String userName, String password) {
+        this.destinations = destinations;
+        this.topic = topic;
+        this.userName = userName;
+        this.password = password;
+    }
+
+    List<String> destinations() {
+        return destinations;
+    }
+
+    String topic() {
+        return topic;
+    }
+
+    Option<String> userName() {
+        return Option.of(userName);
+    }
+
+    Option<String> password() {
+        return Option.of(password);
+    }
+
+    boolean isSecured() {
+        return userName().isDefined() && password().isDefined();
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        PublisherConfig that = (PublisherConfig) o;
+        return Objects.equals(destinations, that.destinations) &&
+                Objects.equals(topic, that.topic) &&
+                Objects.equals(userName, that.userName) &&
+                Objects.equals(password, that.password);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(destinations, topic, userName, password);
+    }
+
+    @Override
+    public String toString() {
+        return "PublisherConfig{" +
+                "destinations=" + destinations +
+                ", topic='" + topic + '\'' +
+                ", userName='" + userName + '\'' +
+                ", password='" + password + '\'' +
+                '}';
+    }
+}
diff --git a/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/VavrUtils.java b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/VavrUtils.java
new file mode 100755
index 0000000..77a3052
--- /dev/null
+++ b/src/main/java/org/onap/dcae/collectors/restconf/common/event/publishing/VavrUtils.java
@@ -0,0 +1,48 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.restconf
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcae.collectors.restconf.common.event.publishing;
+
+import io.vavr.API;
+import io.vavr.API.Match.Case;
+
+import static io.vavr.API.$;
+
+
+public class VavrUtils {
+    private VavrUtils() {
+        // utils aggregator
+    }
+
+    /**
+     * Shortcut for 'string interpolation'
+     */
+    static String f(String msg, Object... args) {
+        return String.format(msg, args);
+    }
+
+    /**
+     * Wrap failure with a more descriptive message of what has failed and chain original cause. Used to provide a
+     * context for errors instead of raw exception.
+     */
+    static Case<Throwable, Throwable> enhanceError(String msg) {
+        return API.Case($(), e -> new RuntimeException(msg, e));
+    }
+}