Addition of Active-Standby Feature

Patch 1: Adds the active-standby feature to drools-pdp.
This feature provides the state control of the
drools-pdp nodes controlling failover with a site
and across sites. Patch 2: Resolve merge conflict in
packages/install/pom.xml and pom.xml. Patch 3: Resolved
comments from Pamela Dragosh and Jorge Hernandez.

Issue-ID: POLICY-156
Change-Id: I922b3d5d8a464006e9675924bcbc7409d68c08d5
Signed-off-by: Kevin McKiou <km097d@att.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/api-active-standby-management/pom.xml b/api-active-standby-management/pom.xml
new file mode 100644
index 00000000..581acae0
--- /dev/null
+++ b/api-active-standby-management/pom.xml
@@ -0,0 +1,49 @@
+<!--
+  ============LICENSE_START=======================================================
+  ECOMP Policy Engine - Drools PDP
+  ================================================================================
+  Copyright (C) 2017 AT&T Intellectual Property. 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=========================================================
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+  
+  <parent>
+    <groupId>org.onap.policy.drools-pdp</groupId>
+    <artifactId>drools-pdp</artifactId>
+    <version>1.1.0-SNAPSHOT</version>
+  </parent>
+  
+  <artifactId>api-active-standby-management</artifactId>
+  
+  <name>api-active-standby-management</name>
+  <description>API for Active Standby Management feature</description>
+
+  <properties>
+          <maven.compiler.source>1.8</maven.compiler.source>
+          <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.onap.policy.drools-pdp</groupId>
+      <artifactId>policy-management</artifactId>
+      <version>${project.version}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+</project>
diff --git a/api-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeatureAPI.java b/api-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeatureAPI.java
new file mode 100644
index 00000000..ef02c617
--- /dev/null
+++ b/api-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeatureAPI.java
@@ -0,0 +1,63 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * api-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.policy.drools.activestandby;
+
+import org.onap.policy.drools.utils.OrderedService;
+import org.onap.policy.drools.utils.OrderedServiceImpl;
+
+/**
+ * This interface provides a way to invoke optional features at various
+ * points in the code. At appropriate points in the
+ * application, the code iterates through this list, invoking these optional
+ * methods.
+ */
+public interface ActiveStandbyFeatureAPI extends OrderedService
+{
+	/**
+	 * 'FeatureAPI.impl.getList()' returns an ordered list of objects
+	 * implementing the 'FeatureAPI' interface.
+	 */
+	public static OrderedServiceImpl<ActiveStandbyFeatureAPI> impl =
+					new OrderedServiceImpl<>(ActiveStandbyFeatureAPI.class);
+
+	/**
+	 * This method returns the resourceName (PDP ID) for the Drools-PDP that is
+	 * currently designated as active.
+	 * 
+	 * @return String (resourceName)
+	 */
+	public String getPdpdNowActive();
+
+	/**
+	 * This method returns the resourceName (PDP ID) for the Drools-PDP that was
+	 * previously designated as active.
+	 * 
+	 * @return String (resourceName)
+	 */
+	public String getPdpdLastActive();
+
+	/**
+	 * This method returns the resourceName associated with this instance of the feature 
+	 * @return String (resourceName)
+	 */
+	public String getResourceName();
+
+}