[AAI-818] Adding a Synapse policy for chameleon.

Synapse policy to serve as read gateway for chameleon

Change-Id: I1b75ba3218e856908091ebaaf17ab1d05483fe02
Signed-off-by: Shwetank Dave <shwetank.dave@amdocs.com>
Issue-ID: AAI-818
Signed-off-by: Shwetank Dave <shwetank.dave@amdocs.com>

6 files changed, 606 insertions, 0 deletions

diff --git a/src/main/java/org/onap/aai/datarouter/query/ChameleonErrorProcessor.java b/src/main/java/org/onap/aai/datarouter/query/ChameleonErrorProcessor.java
new file mode 100644
index 0000000..8206d38
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/ChameleonErrorProcessor.java
@@ -0,0 +1,50 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.datarouter.query;
+
+import org.apache.camel.Exchange;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.cl.eelf.LoggerFactory;
+
+public class ChameleonErrorProcessor  {
+  
+  Logger logger = LoggerFactory.getInstance().getLogger(ChameleonRouter.class.getName());
+  
+  public static final String ECOMP_QUERY_ERROR_CODE = "ECOMP_QUERY_ERROR_CODE";
+
+  private ChameleonErrorProcessor(){}
+  
+  
+  public void process(Exchange exchange) throws Exception {
+    int code = 500;
+    if (exchange.getIn().getHeader(ECOMP_QUERY_ERROR_CODE, Integer.class) != null) {
+      code = exchange.getIn().getHeader(ECOMP_QUERY_ERROR_CODE, Integer.class);
+    }
+    Exception e = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
+    if (e != null) {
+      logger.error(QueryMsgs.QUERY_ERROR, e.toString());
+    }
+
+    exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, code);
+  }
+}
diff --git a/src/main/java/org/onap/aai/datarouter/query/ChameleonResponseBuiler.java b/src/main/java/org/onap/aai/datarouter/query/ChameleonResponseBuiler.java
new file mode 100644
index 0000000..73bf54c
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/ChameleonResponseBuiler.java
@@ -0,0 +1,83 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.datarouter.query;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.camel.Exchange;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+public class ChameleonResponseBuiler  {
+
+  public static void buildEntity(Exchange exchange, String ID){
+    String response = exchange.getIn().getBody().toString();
+    JsonParser parser = new JsonParser();
+    JsonObject root = parser.parse(response).getAsJsonObject();
+    JsonObject champResponse = new JsonObject();
+    if (!root.has("type")) {
+      exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
+      return ;
+    }
+    champResponse.addProperty("key", ID);
+    champResponse.addProperty("type", root.get("type").getAsString());
+    if (root.has("source")) {
+      champResponse.add("source", root.get("source"));
+    }
+    if (root.has("target")) {
+      champResponse.add("target", root.get("target"));
+    }
+
+    JsonObject props = new JsonObject();
+    List<Map.Entry<String, JsonElement>> entries = new ArrayList<Map.Entry<String, JsonElement>>(
+        root.getAsJsonObject().entrySet());
+    for (Map.Entry<String, JsonElement> e : entries) {
+      if (!e.getKey().equals("type") && !e.getKey().equals("source") && !e.getKey().equals("target")) {
+        if (e.getKey().equals("source")) {
+
+        }
+        props.addProperty(e.getKey(), e.getValue().getAsString());
+      }
+
+    }
+    
+    champResponse.add("properties", props);
+
+    exchange.getIn().setBody(champResponse.toString());
+    
+  }
+  
+ 
+  public static void buildObjectRelationship(Exchange exchange, String ID){
+    //TODO: implement when chameleon supports this query     
+  }
+  public static void buildCollection(Exchange exchange){
+    //TODO: implement when chameleon supports this query   
+  }
+  
+ 
+}
diff --git a/src/main/java/org/onap/aai/datarouter/query/ChameleonRouter.java b/src/main/java/org/onap/aai/datarouter/query/ChameleonRouter.java
new file mode 100644
index 0000000..3033820
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/ChameleonRouter.java
@@ -0,0 +1,277 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package  org.onap.aai.datarouter.query;
+
+import java.security.InvalidParameterException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.ws.rs.BadRequestException;
+
+import org.apache.camel.Exchange;
+import org.apache.camel.RuntimeCamelException;
+import org.onap.aai.rest.RestClientEndpoint;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.cl.eelf.LoggerFactory;
+
+public class ChameleonRouter extends QueryRouter {
+
+  Logger logger = LoggerFactory.getInstance().getLogger(ChameleonRouter.class.getName());
+
+  private String chameleonBaseURL;
+
+  private enum ChameleonAction {
+    GET_OBJECT_BY_ID, GET_REL_BY_ID, GET_OBJECT_RELS, GET_OBJECTS_BY_FILTER, GET_RELS_BY_FILTER
+  };
+
+  private static final Pattern QUERY_OBJECT_FILTER_URL_MATCH = Pattern.compile("/objects/filter(.*)");
+  private static final Pattern QUERY_REL_FILTER_URL_MATCH = Pattern.compile("/relationships/filter(.*)");
+  private static final Pattern QUERY_OBJECT_REL_URL_MATCH = Pattern.compile("/objects/relationships/(.*)");
+  private static final Pattern QUERY_OBJECT_ID_URL_MATCH = Pattern.compile("/objects/(.*)");
+  private static final Pattern QUERY_REL_ID_URL_MATCH = Pattern.compile("/relationships/(.*)");
+
+  private static final String ECOMP_QUERY_ID = "ECOMP_QUERY_ID";
+  private static final String ECOMP_QUERY_TYPE = "ECOMP_QUERY_TYPE";
+
+  public ChameleonRouter(String chameleonBaseURL) {
+    String baseURL = chameleonBaseURL.endsWith("/") ? chameleonBaseURL.substring(0, chameleonBaseURL.length() - 1)
+        : chameleonBaseURL;
+    if (checkRecursion(baseURL)) {
+      logger.error(QueryMsgs.QUERY_ERROR,
+          "Invalid chameleonBaseURL : Can't re-route back to DataRouter " + chameleonBaseURL);
+      throw new InvalidParameterException(
+          "Invalid chameleonBaseURL : Can't re-route back to DataRouter " + chameleonBaseURL);
+    }
+    this.chameleonBaseURL = baseURL;
+  }
+
+  public void setQueryRequest(Exchange exchange) {
+    setMDC(exchange);
+    ChameleonAction action = resolveChameleonAction(exchange);
+    String ecompUrl = buildUrl(exchange, action);
+    logger.info(QueryMsgs.QUERY_INFO, "Routing request to Chameleon service URL: " + ecompUrl);
+    exchange.getIn().setHeader(RestClientEndpoint.IN_HEADER_URL, ecompUrl);
+    exchange.getIn().setHeader("X-FromAppId", SERVICE_NAME);
+    exchange.getIn().setHeader("X-TransactionId", getTxId(exchange));
+
+  }
+
+  private boolean urlMatcher(Pattern p, String url) {
+    Matcher m = p.matcher(url);
+    if (m.matches() && !m.group(1).contains("/")) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  private ChameleonAction resolveChameleonAction(Exchange exchange) {
+    String path = exchange.getIn().getHeader(Exchange.HTTP_PATH, String.class);
+    path = path.endsWith("/") ? path.substring(0, path.length() - 1) : path;
+    ChameleonAction action;
+
+    if (urlMatcher(QUERY_OBJECT_FILTER_URL_MATCH, path)) {
+      action = ChameleonAction.GET_OBJECTS_BY_FILTER;
+    } else if (urlMatcher(QUERY_REL_FILTER_URL_MATCH, path)) {
+      action = ChameleonAction.GET_RELS_BY_FILTER;
+    } else if (urlMatcher(QUERY_OBJECT_REL_URL_MATCH, path)) {
+      action = ChameleonAction.GET_OBJECT_RELS;
+    } else if (urlMatcher(QUERY_OBJECT_ID_URL_MATCH, path)) {
+      action = ChameleonAction.GET_OBJECT_BY_ID;
+    } else if (urlMatcher(QUERY_REL_ID_URL_MATCH, path)) {
+      action = ChameleonAction.GET_REL_BY_ID;
+    } else {
+      exchange.getIn().setHeader(ChameleonErrorProcessor.ECOMP_QUERY_ERROR_CODE, 404);
+      throw new RuntimeCamelException();
+    }
+    return action;
+  }
+
+  private String buildUrl(Exchange exchange, ChameleonAction action) {
+    String path = exchange.getIn().getHeader(Exchange.HTTP_PATH, String.class);
+    path = path.endsWith("/") ? path.substring(0, path.length() - 1) : path;
+    String queryParams = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);
+    String ecompUrl = "";
+    String ID = "";
+
+    switch (action) {
+    case GET_OBJECT_BY_ID:
+      ID = path.substring(path.lastIndexOf("/") + 1, path.length());
+      if (ID == null || ID.isEmpty()) {
+        throw new IllegalArgumentException("Invalid URI path with no Object ID: " + path);
+      } else {
+        if (queryParams != null && !queryParams.isEmpty()) {
+          ecompUrl = chameleonBaseURL + "/" + ID + "?" + queryParams;
+
+        } else {
+          ecompUrl = chameleonBaseURL + "/" + ID;
+        }
+      }
+      exchange.getIn().setHeader(ECOMP_QUERY_ID, ID);
+      exchange.getIn().setHeader(ECOMP_QUERY_TYPE, ChameleonAction.GET_OBJECT_BY_ID);
+      break;
+
+    case GET_REL_BY_ID:
+      ID = path.substring(path.lastIndexOf("/") + 1, path.length());
+      if (ID == null || ID.isEmpty()) {
+        throw new IllegalArgumentException("Invalid URI path with no Relationship ID: " + path);
+      } else {
+        if (queryParams != null && !queryParams.isEmpty()) {
+          ecompUrl = chameleonBaseURL + "/" + ID + "?" + queryParams;
+
+        } else {
+          ecompUrl = chameleonBaseURL + "/" + ID;
+        }
+      }
+      exchange.getIn().setHeader(ECOMP_QUERY_ID, ID);
+      exchange.getIn().setHeader(ECOMP_QUERY_TYPE, ChameleonAction.GET_REL_BY_ID);
+      break;
+
+    case GET_OBJECT_RELS:
+      ID = path.substring(path.lastIndexOf("/") + 1, path.length());
+      if (ID == null || ID.isEmpty()) {
+        throw new IllegalArgumentException("Invalid URI path with no Object ID: " + path);
+      } else {
+        if (queryParams != null && !queryParams.isEmpty()) {
+          // TODO: Fix the URL for getting object relations when Chameloen
+          // supports this API
+          ecompUrl = chameleonBaseURL + "/relations" + ID + "?" + queryParams;
+
+        } else {
+          ecompUrl = chameleonBaseURL + "/relations" + ID;
+        }
+      }
+      exchange.getIn().setHeader(ECOMP_QUERY_ID, ID);
+      exchange.getIn().setHeader(ECOMP_QUERY_TYPE, ChameleonAction.GET_OBJECT_RELS);
+      break;
+
+    case GET_OBJECTS_BY_FILTER:
+      if (queryParams != null && !queryParams.isEmpty()) {
+        // TODO: Fix the URL for getting object filter when Chameloen
+        // supports this API
+        ecompUrl = chameleonBaseURL + "/filter?" + queryParams;
+      } else {
+        ecompUrl = chameleonBaseURL + "/filter";
+      }
+      exchange.getIn().setHeader(ECOMP_QUERY_TYPE, ChameleonAction.GET_OBJECTS_BY_FILTER);
+      break;
+
+    case GET_RELS_BY_FILTER:
+      if (queryParams != null && !queryParams.isEmpty()) {
+        // TODO: Fix the URL for getting rel filter when Chameloen
+        // supports this API
+        ecompUrl = chameleonBaseURL + "/filter?" + queryParams;
+      } else {
+        ecompUrl = chameleonBaseURL + "/filter";
+      }
+      exchange.getIn().setHeader(ECOMP_QUERY_TYPE, ChameleonAction.GET_RELS_BY_FILTER);
+      break;
+
+    }
+
+    return ecompUrl;
+  }
+
+  public void setQueryResponse(Exchange exchange) {
+    parseResponse(exchange);
+    adjustHeaders(exchange);
+  }
+
+  private void adjustHeaders(Exchange exchange) {
+    // Remove the internal heders
+    exchange.getIn().removeHeader(ECOMP_QUERY_ID);
+    exchange.getIn().removeHeader(ECOMP_QUERY_TYPE);
+  }
+
+  private void parseResponse(Exchange exchange) throws BadRequestException {
+
+    ChameleonAction action = exchange.getIn().getHeader(ECOMP_QUERY_TYPE, ChameleonAction.class);
+    Integer httpResponseCode = exchange.getIn().getHeader(RestClientEndpoint.OUT_HEADER_RESPONSE_CODE, Integer.class);
+    String ID = "";
+
+    switch (action) {
+    case GET_OBJECT_BY_ID:
+      if (httpResponseCode >= 200 && httpResponseCode <= 299) {
+        ID = exchange.getIn().getHeader(ECOMP_QUERY_ID, String.class);
+        if (ID == null || ID.isEmpty()) {
+          exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
+        } else {
+          ChameleonResponseBuiler.buildEntity(exchange, ID);
+        }
+      } else {
+        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, httpResponseCode);
+      }
+      break;
+    case GET_REL_BY_ID:
+      if (httpResponseCode >= 200 && httpResponseCode <= 299) {
+        ID = exchange.getIn().getHeader(ECOMP_QUERY_ID, String.class);
+        if (ID == null || ID.isEmpty()) {
+          exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
+        } else {
+          ChameleonResponseBuiler.buildEntity(exchange, ID);
+        }
+      } else {
+        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, httpResponseCode);
+      }
+      break;
+    case GET_OBJECT_RELS:
+      if (httpResponseCode >= 200 && httpResponseCode <= 299) {
+        ID = exchange.getIn().getHeader(ECOMP_QUERY_ID, String.class);
+        if (ID == null || ID.isEmpty()) {
+          exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
+        } else {
+          ChameleonResponseBuiler.buildObjectRelationship(exchange, ID);
+        }
+      } else {
+        // TODO:Return 200 with empty body for now until chameleon supports this
+        // query
+        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 200);
+        exchange.getIn().setBody("[]");
+      }
+      break;
+    case GET_OBJECTS_BY_FILTER:
+      if (httpResponseCode >= 200 && httpResponseCode <= 299) {
+        ChameleonResponseBuiler.buildCollection(exchange);
+      } else {
+        // TODO:Return 200 with empty body for now until chameleon supports this
+        // query
+        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 200);
+        exchange.getIn().setBody("[]");
+      }
+      break;
+    case GET_RELS_BY_FILTER:
+      if (httpResponseCode >= 200 && httpResponseCode <= 299) {
+        ChameleonResponseBuiler.buildCollection(exchange);
+      } else {
+        // TODO:Return 200 with empty body for now until chameleon supports this
+        // query
+        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 200);
+        exchange.getIn().setBody("[]");
+      }
+      break;
+
+    }
+
+  }
+
+}
diff --git a/src/main/java/org/onap/aai/datarouter/query/ChampRouter.java b/src/main/java/org/onap/aai/datarouter/query/ChampRouter.java
new file mode 100644
index 0000000..0844c93
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/ChampRouter.java
@@ -0,0 +1,73 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.datarouter.query;
+
+import java.security.InvalidParameterException;
+
+import org.apache.camel.Exchange;
+import org.onap.aai.rest.RestClientEndpoint;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.cl.eelf.LoggerFactory;
+
+public class ChampRouter extends QueryRouter {
+  Logger logger = LoggerFactory.getInstance().getLogger(ChampRouter.class.getName());
+
+  private String champBaseURL;
+  
+
+  public ChampRouter(String champBaseURL) {
+    String baseURL = champBaseURL.endsWith("/") ? champBaseURL.substring(0, champBaseURL.length() - 1)
+        : champBaseURL;
+    if(checkRecursion(baseURL)){
+      logger.info(QueryMsgs.QUERY_INFO, "Invalid champBaseURL : Can't re-route back to DataRouter "+ champBaseURL);
+      throw new InvalidParameterException("Invalid champBaseURL : Can't re-route back to DataRouter "+ champBaseURL);
+    }
+    this.champBaseURL = baseURL;    
+  }
+
+  public void setQueryRequest(Exchange exchange) {
+    setMDC(exchange);
+    String path = exchange.getIn().getHeader(Exchange.HTTP_PATH, String.class);
+    String queryParams = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);
+    String ecompUrl;
+    if (queryParams != null && !queryParams.isEmpty()) {
+      ecompUrl = champBaseURL + path + "?" + queryParams;
+    } else {
+      ecompUrl = champBaseURL + path;
+    }
+
+    logger.info(QueryMsgs.QUERY_INFO, "Routing request to Champ service URL: " + ecompUrl);
+    exchange.getIn().setHeader(RestClientEndpoint.IN_HEADER_URL, ecompUrl);
+    exchange.getIn().setHeader("X-FromAppId", SERVICE_NAME);
+    exchange.getIn().setHeader("X-TransactionId", getTxId(exchange));
+
+  }
+
+  public void setQueryResponse(Exchange exchange) {
+    Integer httpResponseCode = exchange.getIn().getHeader(RestClientEndpoint.OUT_HEADER_RESPONSE_CODE, Integer.class);
+    // Object httpBody = exchange.getIn().getBody();
+    exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, httpResponseCode);
+
+  }
+
+}
diff --git a/src/main/java/org/onap/aai/datarouter/query/QueryMsgs.java b/src/main/java/org/onap/aai/datarouter/query/QueryMsgs.java
new file mode 100644
index 0000000..fba7314
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/QueryMsgs.java
@@ -0,0 +1,47 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.datarouter.query;
+
+import org.onap.aai.cl.eelf.LogMessageEnum;
+
+import com.att.eelf.i18n.EELFResourceManager;
+
+public enum QueryMsgs implements LogMessageEnum {
+
+	/**
+	   * Arguments: {0} = Enricher URL
+	   */
+	  QUERY_INFO,
+
+    QUERY_ERROR;
+	
+	 
+	
+	
+    /**
+     * Static initializer to ensure the resource bundles for this class are loaded...
+     */
+    static {
+        EELFResourceManager.loadMessageBundle("logging/QueryMsgs");
+    };
+}
diff --git a/src/main/java/org/onap/aai/datarouter/query/QueryRouter.java b/src/main/java/org/onap/aai/datarouter/query/QueryRouter.java
new file mode 100644
index 0000000..c9e004c
--- /dev/null
+++ b/src/main/java/org/onap/aai/datarouter/query/QueryRouter.java
@@ -0,0 +1,76 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.datarouter.query;
+
+import java.util.Map;
+import java.util.UUID;
+
+import org.apache.camel.Exchange;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.cl.eelf.LoggerFactory;
+import org.onap.aai.cl.mdc.MdcContext;
+
+
+public abstract class QueryRouter {
+  Logger logger = LoggerFactory.getInstance().getLogger(QueryRouter.class.getName());
+
+
+  protected static final String SERVICE_NAME = "DATA-ROUTER";
+  /** HTTP header containing the ECOMP Request Id */
+  protected static final String HEADER_TRANS_ID = "X-TransactionId";
+  
+  /** HTTP header containing the calling application Id */
+  protected static final String HEADER_FROM_APP_ID = "X-FromAppId";
+  
+  /** HTTP header containing the calling host details */
+  protected static final String HEADER_FROM_HOST = "Host";
+  
+  /** HTTP header containing the calling host details */
+  protected static final String DATA_ROUTER_PORT = "9502";
+  
+
+  public abstract void setQueryRequest(Exchange exchange) ;
+  
+  public abstract void setQueryResponse(Exchange exchange);
+  
+  protected String getTxId(final Exchange exchange){
+    String txId = exchange.getIn().getHeader("X-TransactionId",String.class);    
+    return ((txId==null||txId.isEmpty())?UUID.randomUUID().toString():txId);
+  }
+  
+  protected boolean checkRecursion(String url){
+   return url.contains(DATA_ROUTER_PORT);
+  }
+  
+  protected void setMDC(final Exchange exchange) {
+    String transId = exchange.getIn().getHeader(HEADER_TRANS_ID, String.class);
+    String appId = exchange.getIn().getHeader(HEADER_FROM_APP_ID, String.class);
+    String hostId = exchange.getIn().getHeader(HEADER_FROM_HOST, String.class);
+
+    // Set MDC transaction id, calling service name, calling service id,
+    // partner name, client address
+    MdcContext.initialize(transId, "DataRouter", "", appId, hostId);
+  }
+ 
+
+}