Support environment configurations

This enables PDP-D to have knowledge of any installation
property or else configured via OS environment variable
or as an environment file.

This allows the user to query or set via REST API of programmatically
through PolicyEngine any environment variable.

It also provides a means to make data globally available to all
drools applications.

For example:

http://localhost:9696/policy/pdp/engine/environment> get
HTTP/1.1 200 OK
Content-Length: 749
Content-Type: application/json
Date: Wed, 06 Sep 2017 23:53:57 GMT
Server: Jetty(9.3.14.v20161028)

{
    "DCAE_SERVERS": "",
    "DCAE_TOPIC": "",
    "DMAAP_SERVERS": "",
    "ENGINE_MANAGEMENT_HOST": "0.0.0.0",
    "ENGINE_MANAGEMENT_PASSWORD": "",
    "ENGINE_MANAGEMENT_PORT": "9696",
    "ENGINE_MANAGEMENT_USER": "",
    "HEALTHCHECK_PASSWORD": "",
    "HEALTHCHECK_USER": "",
    "JAVA_HOME": "/usr/lib/jvm/java-8-oracle",
    "M2_HOME": "/usr/share/maven",
    "PAP_HOST": "",
    "PAP_PASSWORD": "",
    "PAP_USERNAME": "",
    "PDPD_CONFIGURATION_API_KEY": "",
    "PDPD_CONFIGURATION_API_SECRET": "",
    "PDPD_CONFIGURATION_CONSUMER_GROUP": "",
    "PDPD_CONFIGURATION_CONSUMER_INSTANCE": "",
    "PDPD_CONFIGURATION_PARTITION_KEY": "",
    "PDPD_CONFIGURATION_SERVERS": "",
    "PDPD_CONFIGURATION_TOPIC": "PDPD-CONFIGURATION",
    "PDP_HOST": "",
    "PDP_PASSWORD": "",
    "PDP_USERNAME": "",
    "POLICY_HOME": "/home/policy/snapshot",
    "SQL_HOST": "",
    "SQL_PASSWORD": "",
    "SQL_USER": ""
}

policy@newton:~/snapshot/config$ echo -n "http://one.com/aai" | http --verbose PUT :9696/policy/pdp/engine/environment/AAI_URL Content-Type:text/plain Accept:text/plain
PUT /policy/pdp/engine/environment/AAI_URL HTTP/1.1
Accept: text/plain
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 18
Content-Type: text/plain
Host: localhost:9696
User-Agent: HTTPie/0.9.2

http://one.com/aai

HTTP/1.1 200 OK
Content-Length: 0
Content-Type: text/plain
Date: Thu, 07 Sep 2017 00:05:05 GMT
Server: Jetty(9.3.14.v20161028)

policy@newton:~/snapshot/config$ echo -n "http://one.com/aai2" | http --verbose PUT :9696/policy/pdp/engine/environment/AAI_URL Content-Type:text/plain Accept:text/plain
PUT /policy/pdp/engine/environment/AAI_URL HTTP/1.1
Accept: text/plain
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 19
Content-Type: text/plain
Host: localhost:9696
User-Agent: HTTPie/0.9.2

http://one.com/aai2

HTTP/1.1 200 OK
Content-Length: 18
Content-Type: text/plain
Date: Thu, 07 Sep 2017 00:05:45 GMT
Server: Jetty(9.3.14.v20161028)

http://one.com/aai

policy@newton:~/snapshot/config$ http :9696/policy/pdp/engine/environment/AAI_URL

HTTP/1.1 200 OK
Content-Length: 19
Content-Type: application/json
Date: Thu, 07 Sep 2017 05:14:57 GMT
Server: Jetty(9.3.14.v20161028)

http://one.com/aai2

Change-Id: I1fcd610938af751977bb2db925b57b4e5b3f7ba4
Issue-ID: POLICY-162
Signed-off-by: Jorge Hernandez <jh1730@att.com>

1 files changed, 168 insertions, 182 deletions

diff --git a/feature-test-transaction/src/main/java/org/onap/policy/drools/testtransaction/TestTransaction.java b/feature-test-transaction/src/main/java/org/onap/policy/drools/testtransaction/TestTransaction.java
index b167898a..4da6b6ee 100644
--- a/feature-test-transaction/src/main/java/org/onap/policy/drools/testtransaction/TestTransaction.java
+++ b/feature-test-transaction/src/main/java/org/onap/policy/drools/testtransaction/TestTransaction.java
@@ -7,9 +7,9 @@
  * 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.
@@ -24,204 +24,190 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-
-
 import org.onap.policy.drools.controller.DroolsController;
-import org.onap.policy.drools.controller.internal.MavenDroolsController;
 import org.onap.policy.drools.system.PolicyController;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
 /**
- * TestTransaction interface 
+ * TestTransaction interface
  *
  */
 public interface TestTransaction {
 
-	public static final String TT_FPC = "TT.FPC";
-	public static final String TT_COUNTER = "$ttc";
-	public static final String TT_UUID = "43868e59-d1f3-43c2-bd6f-86f89a61eea5";
-	public static long DEFAULT_TT_TASK_SLEEP = 20000;
-	
-	public static final TestTransaction manager = new TTImpl();
+  public static final String TT_FPC = "TT.FPC";
+  public static final String TT_COUNTER = "$ttc";
+  public static final String TT_UUID = "43868e59-d1f3-43c2-bd6f-86f89a61eea5";
+  public static long DEFAULT_TT_TASK_SLEEP = 20000;
 
-	public void register(PolicyController controller);
-	public void unregister(PolicyController controller);
+  public static final TestTransaction manager = new TTImpl();
+
+  public void register(PolicyController controller);
+
+  public void unregister(PolicyController controller);
 }
 
+
 /**
- * Implementation of TestTransaction interface.
- * Controls the registering/unregistering of 
- * PolicyController objects and the management
- * of their related TTControllerTask threads. 
+ * Implementation of TestTransaction interface. Controls the registering/unregistering of
+ * PolicyController objects and the management of their related TTControllerTask threads.
  */
 class TTImpl implements TestTransaction {
-	
-	final protected Map<String, TTControllerTask> controllers = new HashMap<>();
-
-	@Override
-	public synchronized void register(PolicyController controller) {
-		if (controllers.containsValue(controller)) {
-			TTControllerTask controllerTask = controllers.get(controller.getName());
-			if (controllerTask.isAlive())
-				return;
-			
-			// continue : unregister, register operation
-		}
-		
-		TTControllerTask controllerTask = new TTControllerTask(controller);
-		controllers.put(controller.getName(), controllerTask);
-	}
-
-	@Override
-	public synchronized void unregister(PolicyController controller) {
-		if (!controllers.containsValue(controller))
-			return;
-		
-		TTControllerTask controllerTask = controllers.get(controller.getName());
-		controllerTask.stop();
-		
-		controllers.remove(controller.getName());
-	}
+
+  final protected Map<String, TTControllerTask> controllers = new HashMap<>();
+
+  @Override
+  public synchronized void register(PolicyController controller) {
+    if (this.controllers.containsValue(controller)) {
+      final TTControllerTask controllerTask = this.controllers.get(controller.getName());
+      if (controllerTask.isAlive())
+        return;
+
+      // continue : unregister, register operation
+    }
+
+    final TTControllerTask controllerTask = new TTControllerTask(controller);
+    this.controllers.put(controller.getName(), controllerTask);
+  }
+
+  @Override
+  public synchronized void unregister(PolicyController controller) {
+    if (!this.controllers.containsValue(controller))
+      return;
+
+    final TTControllerTask controllerTask = this.controllers.get(controller.getName());
+    controllerTask.stop();
+
+    this.controllers.remove(controller.getName());
+  }
 }
 
+
 /**
- * TTControllerTask implements the Runnabale interface
- * Carries out the injection of an event into a drools 
- * session and subsequent query of a counter to ensure
- * that forward progress is occuring. 
- * 
+ * TTControllerTask implements the Runnabale interface Carries out the injection of an event into a
+ * drools session and subsequent query of a counter to ensure that forward progress is occuring.
+ *
  */
 class TTControllerTask implements Runnable {
-    // get an instance of logger 
-	private static final Logger logger = LoggerFactory.getLogger(TTControllerTask.class); 
-   
-	protected final PolicyController controller;
-
-	protected volatile boolean alive = true;
-	protected final Thread thread = new Thread(this);
-
-	public TTControllerTask(PolicyController controller) {
-		this.controller = controller;
-		thread.setName("tt-controller-task-" + controller.getName());
-		thread.start();
-	}
-	
-	public PolicyController getController() {
-		return controller;
-	}
-
-	public synchronized boolean isAlive() {
-		return alive;
-	}
-
-	public synchronized void stop() {
-		this.alive = false;
-		thread.interrupt();
-		try {
-			thread.join(1000);
-		} catch (InterruptedException e) {
-			logger.error("TestTransaction thread threw", e);
-			thread.interrupt();
-		}
-	}	
-	
-	public Thread getThread() {
-		return thread;
-	}
-
-	@Override
-	public void run() {
-		try {	
-			List<String> sessions = 
-					controller.getDrools().getSessionNames();
-			
-			if (!(controller.getDrools().isBrained())) {
-				alive = false;
-				logger.error(this + ": unknown drools controller");
-				return;
-			}
-			
-			DroolsController drools = controller.getDrools();
-			
-			HashMap<String,Long> fpcs = new HashMap<>();
-			for (String session: sessions) {
-				fpcs.put(session, -1L);
-			}
-			
-			while (controller.isAlive() && 
-				   !controller.isLocked() &&
-				   drools.isBrained() &&
-				   alive) {
-				
-				for (String session : sessions) {
-					List<Object> facts = controller.getDrools().factQuery(session,
-							TestTransaction.TT_FPC,
-							TestTransaction.TT_COUNTER,
-							false);
-					if (facts == null || facts.size() != 1) {
-						/* 
-						 * unexpected something wrong here, can't expect to recover 
-						 * note this exception is caught right below at the exit of run()
-						 */
-						logger.error("Controller: {}, with rules artifact: (group) {}, (artifact) {}, (version) {} - FPC query failed after EventObject insertion! ",
-										controller.getName(),
-										controller.getDrools().getGroupId(),
-										controller.getDrools().getArtifactId(), 
-										controller.getDrools().getVersion());
-						break;
-					}
-					logger.debug("Facts: {}", facts);
-					
-					long fpc = (Long) facts.get(0);
-					if (fpc != fpcs.get(session))
-						logger.info("Controller: {} , session {}  - Forward progress successful: {} -> {}",
-										controller.getName(),
-										session,
-										fpcs.get(session), 
-										fpc);
-					else 
-						logger.error("Controller: {}, session {} - Forward progress failure: {}",
-								controller.getName(),
-								session,
-								fpc);
-					
-					fpcs.put(session, fpc);									
-					drools.getContainer().insert(session, new EventObject(TestTransaction.TT_UUID));
-				}
-				
-				if (!alive)
-					return;
-				
-				if (!Thread.currentThread().isInterrupted())
-					Thread.sleep(TestTransaction.DEFAULT_TT_TASK_SLEEP);
-			}
-		} catch (InterruptedException e) {
-			logger.info("{}: stopping ...", this, e);
-		} 
-		catch (IllegalArgumentException e) {
-			logger.error("{}: controller {} has not been enabled for testing: ", this, controller.getName(), e.getMessage());
-		} catch (Exception e) {
-			logger.error("Controller: {} is not testable - TestTransaction caught exception: {} ",
-					controller.getName(),
-					e.getMessage());
-			logger.error("TestTransaction thread threw", e);
-		} finally {
-			logger.info("Exiting: {}", this);
-			alive = false;
-		}
-	}
-
-	@Override
-	public String toString() {
-		StringBuilder builder = new StringBuilder();
-		builder.append("TTControllerTask [controller=");
-		builder.append(controller);
-		builder.append(", alive=");
-		builder.append(alive);
-		builder.append(", thread=");
-		builder.append(thread.getName());
-		builder.append("]");
-		return builder.toString();
-	}
-	
+  // get an instance of logger
+  private static final Logger logger = LoggerFactory.getLogger(TTControllerTask.class);
+
+  protected final PolicyController controller;
+
+  protected volatile boolean alive = true;
+  protected final Thread thread = new Thread(this);
+
+  public TTControllerTask(PolicyController controller) {
+    this.controller = controller;
+    this.thread.setName("tt-controller-task-" + controller.getName());
+    this.thread.start();
+  }
+
+  public PolicyController getController() {
+    return this.controller;
+  }
+
+  public synchronized boolean isAlive() {
+    return this.alive;
+  }
+
+  public synchronized void stop() {
+    this.alive = false;
+    this.thread.interrupt();
+    try {
+      this.thread.join(1000);
+    } catch (final InterruptedException e) {
+      logger.error("TestTransaction thread threw", e);
+      this.thread.interrupt();
+    }
+  }
+
+  public Thread getThread() {
+    return this.thread;
+  }
+
+  @Override
+  public void run() {
+    try {
+      final List<String> sessions = this.controller.getDrools().getSessionNames();
+
+      if (!(this.controller.getDrools().isBrained())) {
+        this.alive = false;
+        logger.error(this + ": unknown drools controller");
+        return;
+      }
+
+      final DroolsController drools = this.controller.getDrools();
+
+      final HashMap<String, Long> fpcs = new HashMap<>();
+      for (final String session : sessions) {
+        fpcs.put(session, -1L);
+      }
+
+      while (this.controller.isAlive() && !this.controller.isLocked() && drools.isBrained()
+          && this.alive) {
+
+        for (final String session : sessions) {
+          final List<Object> facts = this.controller.getDrools().factQuery(session,
+              TestTransaction.TT_FPC, TestTransaction.TT_COUNTER, false);
+          if (facts == null || facts.size() != 1) {
+            /*
+             * unexpected something wrong here, can't expect to recover note this exception is
+             * caught right below at the exit of run()
+             */
+            logger.error(
+                "Controller: {}, with rules artifact: (group) {}, (artifact) {}, (version) {} - FPC query failed after EventObject insertion! ",
+                this.controller.getName(), this.controller.getDrools().getGroupId(),
+                this.controller.getDrools().getArtifactId(),
+                this.controller.getDrools().getVersion());
+            break;
+          }
+          logger.debug("Facts: {}", facts);
+
+          final long fpc = (Long) facts.get(0);
+          if (fpc != fpcs.get(session))
+            logger.info("Controller: {} , session {}  - Forward progress successful: {} -> {}",
+                this.controller.getName(), session, fpcs.get(session), fpc);
+          else
+            logger.error("Controller: {}, session {} - Forward progress failure: {}",
+                this.controller.getName(), session, fpc);
+
+          fpcs.put(session, fpc);
+          drools.getContainer().insert(session, new EventObject(TestTransaction.TT_UUID));
+        }
+
+        if (!this.alive)
+          return;
+
+        if (!Thread.currentThread().isInterrupted())
+          Thread.sleep(TestTransaction.DEFAULT_TT_TASK_SLEEP);
+      }
+    } catch (final InterruptedException e) {
+      logger.info("{}: stopping ...", this, e);
+    } catch (final IllegalArgumentException e) {
+      logger.error("{}: controller {} has not been enabled for testing: ", this,
+          this.controller.getName(), e.getMessage());
+    } catch (final Exception e) {
+      logger.error("Controller: {} is not testable - TestTransaction caught exception: {} ",
+          this.controller.getName(), e.getMessage());
+      logger.error("TestTransaction thread threw", e);
+    } finally {
+      logger.info("Exiting: {}", this);
+      this.alive = false;
+    }
+  }
+
+  @Override
+  public String toString() {
+    final StringBuilder builder = new StringBuilder();
+    builder.append("TTControllerTask [controller=");
+    builder.append(this.controller);
+    builder.append(", alive=");
+    builder.append(this.alive);
+    builder.append(", thread=");
+    builder.append(this.thread.getName());
+    builder.append("]");
+    return builder.toString();
+  }
+
 }