Adding code for bootstrapping policy distribution

* Code changes for initializing handlers & related plugins from
configuration parameter JSON file.
* Using common parameter service for refering parameters at multiple
places.
* Moved related parameters classes from "main" to "reception" to avoid maven
cyclic dependency errors.
* Added test cases for new code chnages. The test coverage is around
95%.
* Changed logging from slf4j to common-logging.

Change-Id: Ifb77cfaa6e6472d43295a7c41a49ddd657c0e2c2
Issue-ID: POLICY-1035
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

2 files changed, 103 insertions, 1 deletions

diff --git a/forwarding/pom.xml b/forwarding/pom.xml
index d2bcc29e..6a7b123a 100644
--- a/forwarding/pom.xml
+++ b/forwarding/pom.xml
@@ -30,12 +30,17 @@
 
     <name>${project.artifactId}</name>
     <description>The module of Policy Distribution that forwards policies to other components.</description>
-    
+
     <dependencies>
         <dependency>
             <groupId>org.onap.policy.distribution</groupId>
             <artifactId>distribution-model</artifactId>
             <version>${project.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.onap.policy.common</groupId>
+            <artifactId>common-parameters</artifactId>
+            <version>1.3.0-SNAPSHOT</version>
+        </dependency>
     </dependencies>
 </project>
diff --git a/forwarding/src/main/java/org/onap/policy/distribution/forwarding/parameters/PolicyForwarderParameters.java b/forwarding/src/main/java/org/onap/policy/distribution/forwarding/parameters/PolicyForwarderParameters.java
new file mode 100644
index 00000000..3bde5009
--- /dev/null
+++ b/forwarding/src/main/java/org/onap/policy/distribution/forwarding/parameters/PolicyForwarderParameters.java
@@ -0,0 +1,97 @@
+/*-
+ * ============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.forwarding.parameters;
+
+import org.onap.policy.common.parameters.GroupValidationResult;
+import org.onap.policy.common.parameters.ParameterGroup;
+import org.onap.policy.common.parameters.ValidationStatus;
+
+/**
+ * Class to hold all the policy forwarder parameters.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class PolicyForwarderParameters implements ParameterGroup {
+    private String forwarderType;
+    private String forwarderClassName;
+
+    /**
+     * Constructor for instantiating PolicyForwarderParameters.
+     *
+     * @param forwarderType the policy forwarder type
+     * @param forwarderClassName the policy forwarder class name
+     */
+    public PolicyForwarderParameters(final String forwarderType, final String forwarderClassName) {
+        this.forwarderType = forwarderType;
+        this.forwarderClassName = forwarderClassName;
+    }
+
+    /**
+     * Return the forwarderType of this PolicyForwarderParameters instance.
+     *
+     * @return the forwarderType
+     */
+    public String getForwarderType() {
+        return forwarderType;
+    }
+
+    /**
+     * Return the forwarderClassName of this PolicyForwarderParameters instance.
+     *
+     * @return the forwarderClassName
+     */
+    public String getForwarderClassName() {
+        return forwarderClassName;
+    }
+
+    @Override
+    public String getName() {
+        return null;
+    }
+
+    /**
+     * Validate the policy forwarder parameters.
+     *
+     */
+    @Override
+    public GroupValidationResult validate() {
+        final GroupValidationResult validationResult = new GroupValidationResult(this);
+        if (forwarderType == null || forwarderType.trim().length() == 0) {
+            validationResult.setResult("forwarderType", ValidationStatus.INVALID, "must be a non-blank string");
+        }
+        if (forwarderClassName == null || forwarderClassName.trim().length() == 0) {
+            validationResult.setResult("forwarderClassName", ValidationStatus.INVALID,
+                    "must be a non-blank string containing full class name of the forwarder");
+        } else {
+            validatePolicyForwarderClass(validationResult);
+        }
+        return validationResult;
+    }
+
+    private void validatePolicyForwarderClass(final GroupValidationResult validationResult) {
+        try {
+            Class.forName(forwarderClassName);
+        } catch (final ClassNotFoundException e) {
+            validationResult.setResult("forwarderClassName", ValidationStatus.INVALID,
+                    "policy forwarder class not found in classpath");
+        }
+    }
+}