Adding code for managing life cycle of SDC Client

* Adding init/start/stop methods in SDCReceptionHandler for managing lifecycle of SDC Client.
* Adding a handler status enum to hold all the possible status values.
* Adding test cases to cover code changes fully.

Change-Id: Ib6f370485ff330538bfada6030c592629ed3fd1c
Issue-ID: POLICY-956
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

5 files changed, 116 insertions, 12 deletions

diff --git a/reception/src/main/java/org/onap/policy/distribution/reception/decoding/PluginTerminationException.java b/reception/src/main/java/org/onap/policy/distribution/reception/decoding/PluginTerminationException.java
new file mode 100644
index 00000000..be9f51cb
--- /dev/null
+++ b/reception/src/main/java/org/onap/policy/distribution/reception/decoding/PluginTerminationException.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2018 Ericsson. 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.distribution.reception.decoding;
+
+/**
+ * This exception will be called if an error occurs while terminating distribution plugins.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class PluginTerminationException extends Exception {
+
+    private static final long serialVersionUID = 3809376274411309160L;
+
+    /**
+     * Construct an instance with the given message.
+     *
+     * @param message the error message
+     */
+    public PluginTerminationException(final String message) {
+        super(message);
+    }
+
+    /**
+     * Construct an instance with the given message and cause.
+     *
+     * @param message the error message
+     * @param cause the cause
+     */
+    public PluginTerminationException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+}
diff --git a/reception/src/main/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandler.java b/reception/src/main/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandler.java
index b189a2ab..a9d76a01 100644
--- a/reception/src/main/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandler.java
+++ b/reception/src/main/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandler.java
@@ -54,7 +54,7 @@ public abstract class AbstractReceptionHandler implements ReceptionHandler {
         final ReceptionHandlerParameters receptionHandlerParameters =
                 (ReceptionHandlerParameters) ParameterService.get(parameterGroupName);
         pluginHandler = new PluginHandler(receptionHandlerParameters.getPluginHandlerParameters().getName());
-        initializeReception(parameterGroupName);
+        initializeReception(receptionHandlerParameters.getPssdConfigurationParametersGroup().getName());
     }
 
     /**
@@ -62,8 +62,9 @@ public abstract class AbstractReceptionHandler implements ReceptionHandler {
      * example setting up subscriptions.
      *
      * @param parameterGroupName the parameter group name
+     * @throws PluginInitializationException if initialization of reception handler fails
      */
-    protected abstract void initializeReception(String parameterGroupName);
+    protected abstract void initializeReception(String parameterGroupName) throws PluginInitializationException;
 
     /**
      * Handle input that has been received. The given input shall be decoded using the {@link PolicyDecoder}s configured
diff --git a/reception/src/main/java/org/onap/policy/distribution/reception/handling/ReceptionHandler.java b/reception/src/main/java/org/onap/policy/distribution/reception/handling/ReceptionHandler.java
index 5fcfb9c0..3678c69c 100644
--- a/reception/src/main/java/org/onap/policy/distribution/reception/handling/ReceptionHandler.java
+++ b/reception/src/main/java/org/onap/policy/distribution/reception/handling/ReceptionHandler.java
@@ -21,6 +21,7 @@
 package org.onap.policy.distribution.reception.handling;
 
 import org.onap.policy.distribution.reception.decoding.PluginInitializationException;
+import org.onap.policy.distribution.reception.decoding.PluginTerminationException;
 
 /**
  * Handles input into Policy Distribution which may be decoded into a Policy.
@@ -37,7 +38,9 @@ public interface ReceptionHandler {
 
     /**
      * Destroy the reception handler, removing any subscriptions and releasing all resources.
+     *
+     * @throws PluginTerminationException if it occurs
      */
-    void destroy();
+    void destroy() throws PluginTerminationException;
 
 }
diff --git a/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PolicyInitializationExceptionTest.java b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PluginInitializationExceptionTest.java
index bf327554..b63e6677 100644
--- a/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PolicyInitializationExceptionTest.java
+++ b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PluginInitializationExceptionTest.java
@@ -25,26 +25,26 @@ import static org.junit.Assert.assertEquals;
 import org.junit.Test;
 
 /**
- * Class to perform unit test of PluginInitializationException.
+ * Class to perform unit test of {@link PluginInitializationException}.
  *
  * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
  */
-public class PolicyInitializationExceptionTest {
+public class PluginInitializationExceptionTest {
 
     @Test
-    public void testPolicyInitializationExceptionString() {
-        final PluginInitializationException policyInitializationException =
+    public void testPluginInitializationExceptionString() {
+        final PluginInitializationException pluginInitializationException =
                 new PluginInitializationException("error message");
-        assertEquals("error message", policyInitializationException.getMessage());
+        assertEquals("error message", pluginInitializationException.getMessage());
     }
 
     @Test
-    public void testPolicyInitializationExceptionStringThrowable() {
+    public void testPluginInitializationExceptionStringThrowable() {
         final Exception cause = new IllegalArgumentException();
-        final PluginInitializationException policyInitializationException =
+        final PluginInitializationException pluginInitializationException =
                 new PluginInitializationException("error message", cause);
-        assertEquals("error message", policyInitializationException.getMessage());
-        assertEquals(cause, policyInitializationException.getCause());
+        assertEquals("error message", pluginInitializationException.getMessage());
+        assertEquals(cause, pluginInitializationException.getCause());
     }
 
 }
diff --git a/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PluginTerminationExceptionTest.java b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PluginTerminationExceptionTest.java
new file mode 100644
index 00000000..b450e32b
--- /dev/null
+++ b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PluginTerminationExceptionTest.java
@@ -0,0 +1,49 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.distribution.reception.decoding;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+/**
+ * Class to perform unit test of {@link PluginTerminationException}
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class PluginTerminationExceptionTest {
+
+    @Test
+    public void testPluginTerminationExceptionString() {
+        final PluginTerminationException pluginTerminationException = new PluginTerminationException("error message");
+        assertEquals("error message", pluginTerminationException.getMessage());
+    }
+
+    @Test
+    public void testPluginTerminationExceptionStringThrowable() {
+        final Exception cause = new IllegalArgumentException();
+        final PluginTerminationException pluginTerminationException =
+                new PluginTerminationException("error message", cause);
+        assertEquals("error message", pluginTerminationException.getMessage());
+        assertEquals(cause, pluginTerminationException.getCause());
+    }
+
+}