Addition of State Management Feature

Patch 1:This commit adds the feature to provide node state management.
There are also a couple of very minor cleanup items in
feature-session-persistence which came up during review and testing.
Patch 2: Cleaned up some logging statements and exceptions per
comments by Pam Dragosh. Patch 3: Clean up per comments from
Jorge Hernandez. Patch4: Added a default to ignoreErrors in
RepositoryAudit. Patch 5: Rebase.  Patch 6: Removed
api-state-management/.gitignore

Issue-ID: POLICY-155
Change-Id: I4fbfa33314d488ff46764931ca965f802b6a26d5
Signed-off-by: Kevin McKiou <km097d@att.com>

2 files changed, 244 insertions, 0 deletions

diff --git a/api-state-management/pom.xml b/api-state-management/pom.xml
new file mode 100644
index 00000000..f5c1e21e
--- /dev/null
+++ b/api-state-management/pom.xml
@@ -0,0 +1,62 @@
+<!--
+  ============LICENSE_START=======================================================
+  ONAP 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-state-management</artifactId>
+  
+  <name>api-state-management</name>
+  <description>Separately loadable module for state management APIe</description>
+
+  <properties>
+          <maven.compiler.source>1.8</maven.compiler.source>
+          <maven.compiler.target>1.8</maven.compiler.target>
+          <swagger.version>1.5.0</swagger.version>
+  </properties>
+
+  <build>
+    <plugins>
+ 		<!-- none -->
+    </plugins>
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.onap.policy.drools-pdp</groupId>
+      <artifactId>policy-core</artifactId>
+      <version>${project.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.onap.policy.common</groupId>
+      <artifactId>integrity-monitor</artifactId>
+      <version>${common-modules.version}</version>
+    </dependency>
+   </dependencies>
+</project>
diff --git a/api-state-management/src/main/java/org/onap/policy/drools/statemanagement/StateManagementFeatureAPI.java b/api-state-management/src/main/java/org/onap/policy/drools/statemanagement/StateManagementFeatureAPI.java
new file mode 100644
index 00000000..a6d808ca
--- /dev/null
+++ b/api-state-management/src/main/java/org/onap/policy/drools/statemanagement/StateManagementFeatureAPI.java
@@ -0,0 +1,182 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * policy-core
+ * ================================================================================
+ * 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.statemanagement;
+
+import java.util.Observer;
+
+import org.onap.policy.common.im.StandbyStatusException;
+import org.onap.policy.common.im.StateManagement;
+import org.onap.policy.drools.properties.Lockable;
+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. Most of the methods here are notification only -- these tend to
+ * return a 'void' value. In other cases, such as 'activatePolicySession',
+ * may 
+ */
+public interface StateManagementFeatureAPI extends OrderedService, Lockable
+{
+	
+	public static final String LOCKED               = StateManagement.LOCKED;
+	  public static final String UNLOCKED             = StateManagement.UNLOCKED;
+	  public static final String ENABLED              = StateManagement.ENABLED;
+	  public static final String DISABLED             = StateManagement.DISABLED;
+	  public static final String ENABLE_NOT_FAILED    = StateManagement.ENABLE_NOT_FAILED;
+	  public static final String DISABLE_FAILED       = StateManagement.DISABLE_FAILED;
+	  public static final String FAILED               = StateManagement.FAILED;
+	  public static final String DEPENDENCY           = StateManagement.DEPENDENCY;
+	  public static final String DEPENDENCY_FAILED    = StateManagement.DEPENDENCY_FAILED;
+	  public static final String DISABLE_DEPENDENCY   = StateManagement.DISABLE_DEPENDENCY;
+	  public static final String ENABLE_NO_DEPENDENCY = StateManagement.ENABLE_NO_DEPENDENCY;
+	  public static final String NULL_VALUE           = StateManagement.NULL_VALUE;
+	  public static final String LOCK                 = StateManagement.LOCK;
+	  public static final String UNLOCK               = StateManagement.UNLOCK;
+	  public static final String PROMOTE              = StateManagement.PROMOTE;
+	  public static final String DEMOTE               = StateManagement.DEMOTE;
+	  public static final String HOT_STANDBY          = StateManagement.HOT_STANDBY;
+	  public static final String COLD_STANDBY         = StateManagement.COLD_STANDBY;
+	  public static final String PROVIDING_SERVICE    = StateManagement.PROVIDING_SERVICE;
+	  
+	  public static final String ADMIN_STATE     = StateManagement.ADMIN_STATE;
+	  public static final String OPERATION_STATE = StateManagement.OPERATION_STATE;
+	  public static final String AVAILABLE_STATUS= StateManagement.AVAILABLE_STATUS;
+	  public static final String STANDBY_STATUS  = StateManagement.STANDBY_STATUS;
+	  
+	  public static final int SEQ_NUM = 0;
+  /**
+   * 'FeatureAPI.impl.getList()' returns an ordered list of objects
+   * implementing the 'FeatureAPI' interface.
+   */
+  static public OrderedServiceImpl<StateManagementFeatureAPI> impl =
+	new OrderedServiceImpl<StateManagementFeatureAPI>(StateManagementFeatureAPI.class);
+
+  /**
+   * This method is called to add an Observer to receive notifications of state changes
+   * 
+   * @param stateChangeObserver
+   */
+  public void addObserver(Observer stateChangeObserver);
+
+  /**
+   * This method returns the X.731 Administrative State for this resource
+   * 
+   * @return String (locked, unlocked)
+   */
+  public String getAdminState();
+  
+  /**
+   * This method returns the X.731 Operational State for this resource
+   * 
+   * @return String (enabled, disabled)
+   */
+  public String getOpState();
+  
+  /**
+   * This method returns the X.731 Availability Status for this resource
+   * 
+   * @return String (failed; dependency; dependency,failed)
+   */
+  public String getAvailStatus();
+    
+  /**
+   * This method returns the X.731 Standby Status for this resource
+   * 
+   * @return String (providingservice, hotstandby or coldstandby)
+   */
+  public String getStandbyStatus();
+  
+  /**
+   * This method returns the X.731 Standby Status for the named resource
+   * @param String (resourceName)
+   * @return String (providingservice, hotstandby or coldstandby)
+   */
+  public String getStandbyStatus(String resourceName);
+  
+  /**
+   * This method moves the X.731 Operational State for the named resource
+   * into a value of disabled and the Availability Status to a value of failed.
+   * As a consequence the Standby Status value will take a value of coldstandby.
+   * 
+   * @param String (resourceName)
+   * @throws Exception 
+   */
+  public void disableFailed(String resourceName) throws Exception;
+  
+  /**
+   * This method moves the X.731 Operational State for this resource
+   * into a value of disabled and the Availability Status to a value of failed.
+   * As a consequence the Standby Status value will take a value of coldstandby.
+   * 
+   * @param String (resourceName)
+   * @throws Exception 
+   */
+  public void disableFailed() throws Exception;
+  
+  /**
+   * This method moves the X.731 Standby Status for this resource from hotstandby 
+   * to providingservice. If the current value is coldstandby, no change is made.
+   * If the current value is null, it will move to providingservice assuming the
+   * Operational State is enabled and Administrative State is unlocked.
+   * @throws Exception 
+   * @throws StandbyStatusException 
+   */
+  public void promote() throws StandbyStatusException, Exception;
+  
+  /**
+   * This method moves the X.731 Standby Status for this resource from providingservice 
+   * to hotstandby. If the current value is null, it will move to hotstandby assuming the
+   * Operational State is enabled and Administrative State is unlocked. Else, it will move
+   * to coldstandby
+   * @throws Exception 
+   */
+  public void demote() throws Exception;
+  
+  /**
+   * This method returns the resourceName associated with this instance of the StateManagementFeature 
+   * @return String (resourceName)
+   */
+  public String getResourceName();
+
+  /**
+   * This Lockable method will lock the StateManagement object Admin state
+   * @return true if successfull, false otherwise
+   */
+  @Override
+  public boolean lock();
+  
+  /**
+   * This Lockable method will unlock the StateManagement object Admin state
+   * @return true if successfull, false otherwise
+   */
+  @Override
+  public boolean unlock();
+
+  /**
+   * This Lockable method indicates the Admin state StateManagement object 
+   * @return true if locked, false otherwise
+   */
+  @Override
+  public boolean isLocked();
+}