Rename slf4j ref impl, add constants

Change-Id: Ib3f24c3aa4974ac8c87fa969613192e884674f00
Issue-ID: LOG-115
Signed-off-by: Luke Parker <lparker@amdocs.com>

18 files changed, 990 insertions, 0 deletions

diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/SLF4JRefApplication.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/SLF4JRefApplication.java
new file mode 100644
index 0000000..146f66b
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/SLF4JRefApplication.java
@@ -0,0 +1,54 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * Spring launcher, for testing invocations via REST.
+ */
+@SpringBootApplication
+public class SLF4JRefApplication {
+
+    /** System property override, read by embedded Logback configuration. */
+    public static final String SLF4J_OUTPUT_DIRECTORY = "SLF4J_OUTPUT_DIRECTORY";
+
+    /**
+     * Launch from CLI.
+     * @param args command-line args.
+     * @throws Exception launch error.
+     */
+    public static void main(final String[] args) throws Exception {
+        initOutputDirectory();
+        SpringApplication.run(SLF4JRefApplication.class, args);
+    }
+
+    /**
+     * Make sure the output directory has a default value. (It'll be
+     * overridden by tests, but not in services.)
+     */
+    static void initOutputDirectory() {
+        System.getProperties().setProperty(SLF4J_OUTPUT_DIRECTORY,
+                System.getProperty(SLF4J_OUTPUT_DIRECTORY, "."));
+    }
+}
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/AbstractBean.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/AbstractBean.java
new file mode 100644
index 0000000..6c6060d
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/AbstractBean.java
@@ -0,0 +1,96 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.bean;
+
+import org.json.JSONObject;
+
+/**
+ * Base class for {@link Request} and {@link Response} beans, since
+ * they're almost the same thing.
+ */
+public abstract class AbstractBean {
+
+    /** Bean property. */
+    private String mService;
+
+    /** Bean property. */
+    private String mCode;
+
+    /** Bean property. */
+    private String mSeverity;
+
+    /**
+     * Getter.
+     * @return bean property.
+     */
+    public String getService() {
+        return this.mService;
+    }
+
+    /**
+     * Setter.
+     * @param service bean property.
+     */
+    public void setService(final String service) {
+        this.mService = service;
+    }
+
+    /**
+     * Getter.
+     * @return bean property.
+     */
+    public String getCode() {
+        return this.mCode;
+    }
+
+    /**
+     * Setter.
+     * @param code bean property.
+     */
+    public void setCode(final String code) {
+        this.mCode = code;
+    }
+
+    /**
+     * Getter.
+     * @return bean property.
+     */
+    public String getSeverity() {
+        return this.mSeverity;
+    }
+
+    /**
+     * Setter.
+     * @param severity bean property.
+     */
+    public void setSeverity(final String severity) {
+        this.mSeverity = severity;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String toString() {
+        return new JSONObject(this).toString(4);
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Request.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Request.java
new file mode 100644
index 0000000..5318333
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Request.java
@@ -0,0 +1,64 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.bean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+/**
+ * Test class, describing a request to be executed.
+ */
+public class Request extends AbstractBean {
+
+    /** Subrequests to be executed. */
+    private final List<Request> mRequests = new ArrayList<>();
+
+    /**
+     * Get subrequests.
+     * @return subrequests.
+     */
+    public List<Request> getRequests() {
+        return mRequests;
+    }
+
+    /**
+     * Parse from serialized form.
+     * @param in JSON.
+     * @return parsed.
+     */
+    public static Request fromJSON(final JSONObject in) {
+        final Request request = new Request();
+        request.setService(in.optString("service"));
+        request.setCode(in.optString("code"));
+        request.setSeverity(in.optString("severity"));
+        final JSONArray requests = in.optJSONArray("requests");
+        if (requests != null) {
+            for (int i = 0 ; i < requests.length() ; i++) {
+                request.getRequests().add(Request.fromJSON(requests.getJSONObject(i)));
+            }
+        }
+        return request;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Response.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Response.java
new file mode 100644
index 0000000..b0c6a4a
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/Response.java
@@ -0,0 +1,63 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.bean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+/**
+ * Test class, describing an outcome that should be reported.
+ */
+public class Response extends  AbstractBean {
+
+    /** Delegate responses. */
+    private final List<Response> mResponses = new ArrayList<>();
+
+    /**
+     * Get delegate responses.
+     * @return responses.
+     */
+    public List<Response> getResponses() {
+        return mResponses;
+    }
+
+    /**
+     * Parse from serialized form.
+     * @param in JSON.
+     * @return parsed.
+     */
+    public static Response fromJSON(final JSONObject in) {
+        final Response request = new Response();
+        request.setCode(in.optString("code"));
+        request.setSeverity(in.optString("severity"));
+        final JSONArray responses = in.optJSONArray("responses");
+        if (responses != null) {
+            for (int i = 0 ; i < responses.length() ; i++) {
+                request.getResponses().add(Response.fromJSON(responses.getJSONObject(i)));
+            }
+        }
+        return request;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/package-info.java
new file mode 100644
index 0000000..2364f9f
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/bean/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.bean;
+
+/**
+ * Simple request/responses beans for testcases.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/AbstractComponent.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/AbstractComponent.java
new file mode 100644
index 0000000..b6a2c95
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/AbstractComponent.java
@@ -0,0 +1,278 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component;
+
+import java.util.Locale;
+import java.util.Map;
+import java.util.UUID;
+
+import javax.servlet.http.HttpServletRequest;
+
+import com.mashape.unirest.http.HttpResponse;
+import com.mashape.unirest.http.JsonNode;
+import com.mashape.unirest.http.Unirest;
+import com.mashape.unirest.http.exceptions.UnirestException;
+import org.apache.commons.lang3.StringUtils;
+import org.json.JSONObject;
+import org.onap.logging.ref.slf4j.ONAPLogAdapter;
+import org.onap.logging.ref.slf4j.ONAPLogConstants;
+import org.onap.logging.ref.slf4j.demo.bean.Request;
+import org.onap.logging.ref.slf4j.demo.bean.Response;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
+import org.springframework.http.MediaType;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * Base class for <tt>Alpha</tt>, <tt>Beta</tt> and <tt>Gamma</tt>
+ * and <tt>Delta</tt> controllers, implementing all the actual logic.
+ *
+ * <p>(The subclasses provide nothing but identifiers to allow them
+ * to be distinguished from one another, for the purposes of addressing
+ * requests and generating the call graph from their logger output.)</p>
+ */
+@RestController
+public abstract class AbstractComponent {
+
+    /**
+     * Test switch, routing invocations between components in-process,
+     * rather than via REST over HTTP.
+     */
+    private static boolean sInProcess;
+
+    /**
+     * Get service identifier, used to derive {@link #getServiceName()},
+     * <tt>PartnerName</tt>, etc.
+     * @return <tt>alpha</tt>, <tt>beta</tt>, <tt>gamma</tt>.
+     */
+    protected abstract String getId();
+
+    /**
+     * Get component UUID.
+     * @return globally unique ID string.
+     */
+    protected abstract String getInstanceUUID();
+
+    /**
+     * Execute REST request.
+     * @param request request data.
+     * @param http HTTP request.
+     * @return response data.
+     * @throws UnirestException REST error.
+     */
+    @RequestMapping(value = "/invoke",
+            method = RequestMethod.POST,
+            consumes = MediaType.APPLICATION_JSON_VALUE,
+            produces = MediaType.APPLICATION_JSON_VALUE)
+    public Response execute(final Request request,
+                            final HttpServletRequest http) throws UnirestException {
+
+        final ONAPLogAdapter adapter = new ONAPLogAdapter(this.getLogger());
+
+        try {
+
+            adapter.entering(new ONAPLogAdapter.HttpServletRequestAdapter(http));
+
+            final Response response = new Response();
+            response.setService(request.getService());
+            final String code = StringUtils.defaultString(request.getCode(), "OK").toUpperCase();
+            response.setCode(this.getId() + "." + code);
+            response.setSeverity(StringUtils.defaultString(request.getSeverity(), "INFO"));
+
+            for (final Request target : request.getRequests()) {
+                final Response targetResponse = this.executeDelegate(target, http, adapter);
+                response.getResponses().add(targetResponse);
+            }
+
+            return response;
+        }
+        finally {
+            adapter.exiting();
+        }
+    }
+
+    /**
+     * Set in-process mode, for unit testing.
+     */
+    static void setInProcess() {
+        sInProcess = true;
+    }
+
+    /**
+     * Execute request.
+     * @param request to be executed.
+     * @param http incoming HTTP request.
+     * @param logger logging adapter.
+     * @return response
+     */
+    private Response executeDelegate(final Request request,
+                                     final HttpServletRequest http,
+                                     final ONAPLogAdapter logger) {
+
+
+        notNull(request);
+        notNull(http);
+
+        // Downstream call.
+
+        try {
+
+            if (sInProcess) {
+                return this.executeInProcess(request, logger);
+            }
+
+            return this.executeREST(request, http, logger);
+        }
+        catch (final UnirestException | ReflectiveOperationException e) {
+            logger.unwrap().error("Execute error", e);
+            final Response response = new Response();
+            response.setCode((this.getServiceName() + ".INVOKE_ERROR").toUpperCase(Locale.getDefault()));
+            response.setSeverity("ERROR");
+            return response;
+        }
+    }
+
+    /**
+     * Execute invocation over REST.
+     * @param request mock request to be executed.
+     * @param http HTTP request, used (only) to address the outgoing request.
+     * @param logger logger adapter.
+     * @return invocation response.
+     * @throws UnirestException REST error.
+     */
+    private Response executeREST(final Request request,
+                                 final HttpServletRequest http,
+                                 final ONAPLogAdapter logger) throws UnirestException {
+        // Otherwise via REST.
+
+        logger.unwrap().info("Sending:\n{}", request);
+        final StringBuilder url = new StringBuilder();
+        url.append(http.getProtocol()).append("://");
+        url.append(http.getServerName()).append(':');
+        url.append(http.getServerPort()).append("/services/").append(request.getService());
+
+        final UUID invocationID = logger.invoke(ONAPLogConstants.InvocationMode.SYNCHRONOUS);
+        final HttpResponse<JsonNode> response =
+                Unirest.post(url.toString())
+                        .header(ONAPLogConstants.Headers.REQUEST_ID, MDC.get(ONAPLogConstants.MDCs.REQUEST_ID))
+                        .header(ONAPLogConstants.Headers.INVOCATION_ID, invocationID.toString())
+                        .header(ONAPLogConstants.Headers.PARTNER_NAME, this.getServiceName())
+                        .header("Accept", MediaType.APPLICATION_JSON_VALUE)
+                        .header("Content-Type", MediaType.APPLICATION_JSON_VALUE)
+                        .body(request)
+                        .asJson();
+
+        // Parse response.
+
+        final JSONObject responseJSON = response.getBody().getObject();
+        logger.unwrap().info("Received:\n{}", responseJSON);
+        return Response.fromJSON(responseJSON);
+    }
+
+    /**
+     * Execute request in-process.
+     * @param request mock request to be executed.
+     * @param logger logger adapter.
+     * @return invocation response.
+     * @throws ReflectiveOperationException error loading target class.
+     * @throws UnirestException REST error.
+     */
+    private Response executeInProcess(final Request request,
+                                      final ONAPLogAdapter logger) throws ReflectiveOperationException, UnirestException {
+
+        logger.unwrap().info("Executing in-process:\n{}", request);
+
+        // Derive the name of the delegate class.
+
+        final String delegateClass
+                = AbstractComponent.class.getPackage().getName() + "." + request.getService()
+                + ".Component" + request.getService().substring(0, 1).toUpperCase()
+                + request.getService().substring(1);
+        logger.unwrap().info("Invoking in-process [{}].", delegateClass);
+        final AbstractComponent component = (AbstractComponent)Class.forName(delegateClass).newInstance();
+
+        // Using Spring mock since we're not *actually* going over HTTP.
+
+        final MockHttpServletRequest mock = new MockHttpServletRequest();
+
+        // Generate INVOCATION_ID, and set MDCs aside for safekeeping.
+        // (This is because when mocking, everything happens in the same thread.)
+
+        final UUID invocationID = logger.invoke(ONAPLogConstants.InvocationMode.SYNCHRONOUS);
+        final String requestID = MDC.get(ONAPLogConstants.MDCs.REQUEST_ID);
+        final Map<String, String> safekeeping = MDC.getCopyOfContextMap();
+
+        // Set headers.
+
+        mock.addHeader(ONAPLogConstants.Headers.REQUEST_ID, StringUtils.defaultString(requestID));
+        mock.addHeader(ONAPLogConstants.Headers.INVOCATION_ID, invocationID.toString());
+        mock.addHeader(ONAPLogConstants.Headers.PARTNER_NAME, this.getServiceName());
+
+        try {
+
+            MDC.clear();
+
+            // Execute.
+
+            return component.execute(request, mock);
+        }
+        finally {
+
+            // Restore MDCs.
+
+            safekeeping.forEach((k, v) -> MDC.put(k, v));
+        }
+    }
+
+    /**
+     * Ensure non-nullness.
+     * @param in to be checked.
+     * @param <T> type.
+     * @return input value, not null.
+     */
+    private static <T> T notNull(final T in) {
+        if (in == null) {
+            throw new AssertionError("");
+        }
+        return in;
+    }
+
+    /**
+     * Get service name, with default.
+     * @return service name, suitable for logging as MDC.
+     */
+    private String getServiceName() {
+        return "service." + StringUtils.defaultString(this.getId(), "unnamed");
+    }
+
+    /**
+     * Get logger instance.
+     * @return logger.
+     */
+    private Logger getLogger() {
+        return LoggerFactory.getLogger(this.getClass());
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/ComponentAlpha.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/ComponentAlpha.java
new file mode 100644
index 0000000..d5cf182
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/ComponentAlpha.java
@@ -0,0 +1,53 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.alpha;
+
+import java.util.UUID;
+
+import org.onap.logging.ref.slf4j.demo.component.AbstractComponent;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * Discrete service, identical to the others but with its own identifiers.
+ */
+@RequestMapping("/services/alpha")
+public class ComponentAlpha extends AbstractComponent {
+
+    /** Component instance UUID constant. */
+    private static final String INSTANCE_UUID = UUID.randomUUID().toString();
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getId() {
+        return "alpha";
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getInstanceUUID() {
+        return INSTANCE_UUID;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/package-info.java
new file mode 100644
index 0000000..4fa0fbc
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/alpha/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.alpha;
+
+/**
+ * Example service.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/ComponentBeta.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/ComponentBeta.java
new file mode 100644
index 0000000..9a4e6eb
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/ComponentBeta.java
@@ -0,0 +1,53 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.beta;
+
+import java.util.UUID;
+
+import org.onap.logging.ref.slf4j.demo.component.AbstractComponent;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * Discrete service, identical to the others but with its own identifiers.
+ */
+@RequestMapping("/services/beta")
+public class ComponentBeta extends AbstractComponent {
+
+    /** Component instance UUID constant. */
+    private static final String INSTANCE_UUID = UUID.randomUUID().toString();
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getId() {
+        return "beta";
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getInstanceUUID() {
+        return INSTANCE_UUID;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/package-info.java
new file mode 100644
index 0000000..68d7f74
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/beta/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.beta;
+
+/**
+ * Example service.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/ComponentDelta.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/ComponentDelta.java
new file mode 100644
index 0000000..d63d80a
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/ComponentDelta.java
@@ -0,0 +1,53 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.delta;
+
+import java.util.UUID;
+
+import org.onap.logging.ref.slf4j.demo.component.AbstractComponent;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * Discrete service, identical to the others but with its own identifiers.
+ */
+@RequestMapping("/services/delta")
+public class ComponentDelta extends AbstractComponent {
+
+    /** Component instance UUID constant. */
+    private static final String INSTANCE_UUID = UUID.randomUUID().toString();
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getId() {
+        return "delta";
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getInstanceUUID() {
+        return INSTANCE_UUID;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/package-info.java
new file mode 100644
index 0000000..4b02ab4
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/delta/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.delta;
+
+/**
+ * Example service.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/ComponentGamma.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/ComponentGamma.java
new file mode 100644
index 0000000..9294743
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/ComponentGamma.java
@@ -0,0 +1,53 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.gamma;
+
+import java.util.UUID;
+
+import org.onap.logging.ref.slf4j.demo.component.AbstractComponent;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * Discrete service, identical to the others but with its own identifiers.
+ */
+@RequestMapping("/services/gamma")
+public class ComponentGamma extends AbstractComponent {
+
+    /** Component instance UUID constant. */
+    private static final String INSTANCE_UUID = UUID.randomUUID().toString();
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getId() {
+        return "gamma";
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected String getInstanceUUID() {
+        return INSTANCE_UUID;
+    }
+}
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/package-info.java
new file mode 100644
index 0000000..7f5e30a
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/gamma/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component.gamma;
+
+/**
+ * Example service.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/package-info.java
new file mode 100644
index 0000000..c650948
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/component/package-info.java
@@ -0,0 +1,26 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo.component;
+
+/**
+ * Components that demonstrate usage and participate in the test.
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/package-info.java b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/package-info.java
new file mode 100644
index 0000000..feb5e85
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/java/org/onap/logging/ref/slf4j/demo/package-info.java
@@ -0,0 +1,30 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.demo;
+
+/**
+ * Minimal, spring-boot refernce example.
+ *
+ * <p>Code that exists for testing can have whatever dependencies
+ * it likes, but take care with the contents of <tt>common</tt>,
+ * since it may be useful elsewhere.</p>
+ */
\ No newline at end of file
diff --git a/reference/logging-slf4j-demo/src/main/resources/logback.xml b/reference/logging-slf4j-demo/src/main/resources/logback.xml
new file mode 100644
index 0000000..554d712
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/resources/logback.xml
@@ -0,0 +1,35 @@
+<configuration>
+
+    <property name="p_tim" value="%d{&quot;yyyy-MM-dd'T'HH:mm:ss.SSSXXX&quot;, UTC}"/>
+    <property name="p_lvl" value="%level"/>
+    <property name="p_log" value="%logger"/>
+    <property name="p_mdc" value="%replace(%replace(%mdc){'\t','\\\\t'}){'\n', '\\\\n'}"/>
+    <property name="p_msg" value="%replace(%replace(%msg){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+    <property name="p_exc" value="%replace(%replace(%rootException){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+    <property name="p_mak" value="%replace(%replace(%marker){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+    <property name="p_thr" value="%thread"/>
+    <property name="pattern" value="%nopexception${p_tim}\t${p_thr}\t${p_lvl}\t${p_log}\t${p_mdc}\t${p_msg}\t${p_exc}\t${p_mak}\t%n"/>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>${pattern}</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
+        <file>${SLF4J_OUTPUT_DIRECTORY}/output.log</file>
+        <encoder>
+            <pattern>${pattern}</pattern>
+        </encoder>
+    </appender>
+
+    <logger level="debug" name="org.onap.logging.ref.slf4j" additivity="false">
+        <appender-ref ref="STDOUT" />
+        <appender-ref ref="FILE" />
+    </logger>
+
+    <root level="error">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+</configuration>
diff --git a/reference/logging-slf4j-demo/src/main/webapp/WEB-INF/web.xml b/reference/logging-slf4j-demo/src/main/webapp/WEB-INF/web.xml
new file mode 100644
index 0000000..91a632c
--- /dev/null
+++ b/reference/logging-slf4j-demo/src/main/webapp/WEB-INF/web.xml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="slf4j-reference" version="3.0"/>