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/*-
* ============LICENSE_START=======================================================
* feature-test-transaction
* ================================================================================
* 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.testtransaction;
import java.util.EventObject;
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
*
*/
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 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.
*/
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());
}
}
/**
* 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();
}
}
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