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/*-
* ============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.openecomp.policy.drools.core;
import org.kie.api.event.rule.AfterMatchFiredEvent;
import org.kie.api.event.rule.AgendaEventListener;
import org.kie.api.event.rule.AgendaGroupPoppedEvent;
import org.kie.api.event.rule.AgendaGroupPushedEvent;
import org.kie.api.event.rule.BeforeMatchFiredEvent;
import org.kie.api.event.rule.MatchCancelledEvent;
import org.kie.api.event.rule.MatchCreatedEvent;
import org.kie.api.event.rule.ObjectDeletedEvent;
import org.kie.api.event.rule.ObjectInsertedEvent;
import org.kie.api.event.rule.ObjectUpdatedEvent;
import org.kie.api.event.rule.RuleFlowGroupActivatedEvent;
import org.kie.api.event.rule.RuleFlowGroupDeactivatedEvent;
import org.kie.api.event.rule.RuleRuntimeEventListener;
import org.kie.api.runtime.KieSession;
import org.openecomp.policy.common.logging.eelf.MessageCodes;
import org.openecomp.policy.common.logging.flexlogger.FlexLogger;
import org.openecomp.policy.common.logging.flexlogger.Logger;
import org.openecomp.policy.drools.core.jmx.PdpJmx;
/**
* This class is a wrapper around 'KieSession', which adds the following:
*
* 1) A thread running 'KieSession.fireUntilHalt()'
* 2) Access to UEB
* 3) Logging of events
*/
public class PolicySession
implements AgendaEventListener, RuleRuntimeEventListener
{
// get an instance of logger
private static Logger logger = FlexLogger.getLogger(PolicySession.class);
// name of the 'PolicySession' and associated 'KieSession'
private String name;
// the associated 'PolicyContainer', which may have additional
// 'PolicySession' instances in addition to this one
private PolicyContainer container;
// associated 'KieSession' instance
private KieSession kieSession;
// if not 'null', this is the thread running 'kieSession.fireUntilHalt()'
private Thread thread = null;
// supports 'getCurrentSession()' method
static private ThreadLocal<PolicySession> policySession =
new ThreadLocal<PolicySession>();
/**
* Internal constructor - create a 'PolicySession' instance
*
* @param name the name of this 'PolicySession' (and 'kieSession')
* @param container the 'PolicyContainer' instance containing this session
* @param kieSession the associated 'KieSession' instance
*/
protected PolicySession(String name,
PolicyContainer container, KieSession kieSession)
{
this.name = name;
this.container = container;
this.kieSession = kieSession;
kieSession.addEventListener((AgendaEventListener)this);
kieSession.addEventListener((RuleRuntimeEventListener)this);
}
/**
* @return the 'PolicyContainer' object containing this session
*/
public PolicyContainer getPolicyContainer()
{
return(container);
}
/**
* @return the associated 'KieSession' instance
*/
public KieSession getKieSession()
{
return(kieSession);
}
/**
* @return the local name of this session, which should either match the
* name specified in 'kmodule.xml' file associated with this session, or the
* name passed on the 'PolicyContainer.adoptKieSession' method.
*/
public String getName()
{
return(name);
}
/**
* @return the 'PolicyContainer' name, followed by ':', followed by the
* local name of the session. It should be useful in log messages.
*/
public String getFullName()
{
return(container.getName() + ":" + name);
}
/**
* this starts a separate thread, which invokes 'KieSession.fireUntilHalt()'.
* It does nothing if the thread already exists.
*/
public synchronized void startThread()
{
if (thread == null)
{
logger.info("startThread with name " + getFullName());
thread = new Thread("Session " + getFullName())
{
public void run()
{
// set thread local variable
policySession.set(PolicySession.this);
// We want to continue, despite any exceptions that occur
// while rules are fired.
boolean repeat = true;
long minSleepTime = 100;
long maxSleepTime = 5000;
long sleepTime = maxSleepTime;
while (repeat)
{
if(this.isInterrupted()){
break;
}
try
{
if (kieSession.fireAllRules() > 0)
{
// some rules fired -- reduce poll delay
if (sleepTime > minSleepTime)
{
sleepTime /= 2;
if (sleepTime < minSleepTime)
{
sleepTime = minSleepTime;
}
}
}
else
{
// no rules fired -- increase poll delay
if (sleepTime < maxSleepTime)
{
sleepTime *= 2;
if (sleepTime > maxSleepTime)
{
sleepTime = maxSleepTime;
}
}
}
}
catch (Throwable e)
{
logger.error(MessageCodes.EXCEPTION_ERROR, e, "startThread", "kieSession.fireUntilHalt");
}
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
break;
}
}
logger.info("fireUntilHalt() returned");
}
};
thread.start();
}
}
/**
* if a thread is currently running, this invokes 'KieSession.halt()' to
* stop it.
*/
public synchronized void stopThread()
{
if (thread != null)
{
// this should cause the thread to exit
thread.interrupt();
try
{
// wait for the thread to stop
thread.join();
}
catch (Exception e)
{
logger.error(MessageCodes.EXCEPTION_ERROR, e, "stopThread", "thread.join");
}
thread = null;
}
}
/**
* @return the 'PolicySession' instance associated with the current thread
* (Note that this only works if the current thread is the one running
* 'kieSession.fireUntilHalt()'.)
*/
public static PolicySession getCurrentSession()
{
return(policySession.get());
}
/***********************************/
/* 'AgendaEventListener' interface */
/***********************************/
/**
* {@inheritDoc}
*/
@Override
public void afterMatchFired(AfterMatchFiredEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("afterMatchFired: " + getFullName()
+ ": AgendaEventListener.afterMatchFired(" + event + ")");
}
PdpJmx.getInstance().ruleFired();
}
/**
* {@inheritDoc}
*/
@Override
public void afterRuleFlowGroupActivated(RuleFlowGroupActivatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("afterRuleFlowGroupActivated: " + getFullName()
+ ": AgendaEventListener.afterRuleFlowGroupActivated("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void afterRuleFlowGroupDeactivated
(RuleFlowGroupDeactivatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("afterRuleFlowGroupDeactivated: " + getFullName()
+ ": AgendaEventListener.afterRuleFlowGroupDeactivated("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void agendaGroupPopped(AgendaGroupPoppedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("agendaGroupPopped: " + getFullName()
+ ": AgendaEventListener.agendaGroupPopped("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void agendaGroupPushed(AgendaGroupPushedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("agendaGroupPushed: " + getFullName()
+ ": AgendaEventListener.agendaGroupPushed("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void beforeMatchFired(BeforeMatchFiredEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("beforeMatchFired: " + getFullName()
+ ": AgendaEventListener.beforeMatchFired("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void beforeRuleFlowGroupActivated
(RuleFlowGroupActivatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("beforeRuleFlowGroupActivated: " + getFullName()
+ ": AgendaEventListener.beforeRuleFlowGroupActivated("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void beforeRuleFlowGroupDeactivated
(RuleFlowGroupDeactivatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("beforeRuleFlowGroupDeactivated: " + getFullName()
+ ": AgendaEventListener.beforeRuleFlowGroupDeactivated("
+ event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void matchCancelled(MatchCancelledEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("matchCancelled: " + getFullName()
+ ": AgendaEventListener.matchCancelled(" + event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void matchCreated(MatchCreatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("matchCreated: " + getFullName()
+ ": AgendaEventListener.matchCreated(" + event + ")");
}
}
/****************************************/
/* 'RuleRuntimeEventListener' interface */
/****************************************/
/**
* {@inheritDoc}
*/
@Override
public void objectDeleted(ObjectDeletedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("objectDeleted: " + getFullName()
+ ": AgendaEventListener.objectDeleted(" + event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void objectInserted(ObjectInsertedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("objectInserted: " + getFullName()
+ ": AgendaEventListener.objectInserted(" + event + ")");
}
}
/**
* {@inheritDoc}
*/
@Override
public void objectUpdated(ObjectUpdatedEvent event)
{
if (logger.isDebugEnabled())
{
logger.debug("objectUpdated: " + getFullName()
+ ": AgendaEventListener.objectUpdated(" + event + ")");
}
}
}
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