/*
* Copyright 2010 JBoss Inc
*
* 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.
*/
package org.drools.core.impl;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
import org.drools.core.SessionConfiguration;
import org.drools.core.base.MapGlobalResolver;
import org.drools.core.command.impl.ContextImpl;
import org.drools.core.command.impl.FixedKnowledgeCommandContext;
import org.drools.core.command.impl.GenericCommand;
import org.drools.core.command.runtime.BatchExecutionCommandImpl;
import org.drools.core.command.runtime.rule.FireAllRulesCommand;
import org.drools.core.common.AbstractWorkingMemory;
import org.drools.core.common.InternalRuleBase;
import org.drools.core.common.WorkingMemoryFactory;
import org.drools.core.event.AgendaEventSupport;
import org.drools.core.event.ProcessEventSupport;
import org.drools.core.event.WorkingMemoryEventSupport;
import org.drools.core.impl.StatefulKnowledgeSessionImpl.AgendaEventListenerWrapper;
import org.drools.core.runtime.impl.ExecutionResultImpl;
import org.drools.core.runtime.process.InternalProcessRuntime;
import org.kie.api.KieBase;
import org.kie.api.command.Command;
import org.kie.api.event.process.ProcessEventListener;
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.event.rule.WorkingMemoryEventListener;
import org.kie.api.runtime.Channel;
import org.kie.api.runtime.Environment;
import org.kie.api.runtime.ExecutionResults;
import org.kie.api.runtime.Globals;
import org.kie.api.runtime.KieSessionConfiguration;
import org.kie.api.runtime.StatelessKieSession;
import org.kie.internal.agent.KnowledgeAgent;
import org.kie.internal.runtime.StatefulKnowledgeSession;
import org.kie.internal.runtime.StatelessKnowledgeSession;
public class StatelessKnowledgeSessionImpl extends AbstractRuntime
implements
StatelessKnowledgeSession,
StatelessKieSession {
private InternalRuleBase ruleBase;
private KnowledgeAgent kagent;
private MapGlobalResolver sessionGlobals = new MapGlobalResolver();
private Map<String, Channel> channels = new HashMap<String, Channel>();
/** The event mapping */
public Map<RuleRuntimeEventListener, org.drools.core.event.WorkingMemoryEventListener> mappedWorkingMemoryListeners;
public Map<AgendaEventListener, org.drools.core.event.AgendaEventListener> mappedAgendaListeners;
public Set<ProcessEventListener> cachedProcessEventListener;
/** The event support */
private AgendaEventSupport agendaEventSupport = new AgendaEventSupport();
private WorkingMemoryEventSupport workingMemoryEventSupport = new WorkingMemoryEventSupport();
private ProcessEventSupport processEventSupport = new ProcessEventSupport();
private boolean initialized;
private KieSessionConfiguration conf;
private Environment environment;
private transient StatefulKnowledgeSession ksession;
private WorkingMemoryFactory wmFactory;
public StatelessKnowledgeSessionImpl() {
}
public StatelessKnowledgeSessionImpl(final InternalRuleBase ruleBase,
final KnowledgeAgent kagent,
final KieSessionConfiguration conf) {
this.ruleBase = ruleBase;
this.kagent = kagent;
this.conf = (conf != null) ? conf : SessionConfiguration.getDefaultInstance();
this.environment = EnvironmentFactory.newEnvironment();
this.wmFactory = ruleBase.getConfiguration().getComponentFactory().getWorkingMemoryFactory();
}
public InternalRuleBase getRuleBase() {
if (this.kagent != null) {
// if we have an agent always get the rulebase from there
this.ruleBase = (InternalRuleBase) ((KnowledgeBaseImpl) this.kagent.getKnowledgeBase()).ruleBase;
}
return this.ruleBase;
}
public KnowledgeAgent getKnowledgeAgent() {
return this.kagent;
}
public StatefulKnowledgeSession newWorkingMemory() {
if (ksession != null && ((StatefulKnowledgeSessionImpl)ksession).isAlive()) {
return ksession;
}
if (this.kagent != null) {
// if we have an agent always get the rulebase from there
this.ruleBase = (InternalRuleBase) ((KnowledgeBaseImpl) this.kagent.getKnowledgeBase()).ruleBase;
}
this.ruleBase.readLock();
try {
AbstractWorkingMemory wm = (AbstractWorkingMemory) wmFactory.createWorkingMemory(this.ruleBase.nextWorkingMemoryCounter(), this.ruleBase,
(SessionConfiguration) this.conf, this.environment);
// we don't pass the mapped listener wrappers to the session constructor anymore,
// because they would be ignored anyway, since the wm already contains those listeners
ksession = new StatefulKnowledgeSessionImpl(wm,
new KnowledgeBaseImpl(this.ruleBase));
((Globals) wm.getGlobalResolver()).setDelegate(this.sessionGlobals);
if (!initialized) {
// copy over the default generated listeners that are used for internal stuff once
registerSystemListeners(wm);
registerCustomListeners();
initialized = true;
}
wm.setAgendaEventSupport( this.agendaEventSupport );
wm.setWorkingMemoryEventSupport( this.workingMemoryEventSupport );
InternalProcessRuntime processRuntime = wm.getProcessRuntime();
if ( processRuntime != null ) {
processRuntime.setProcessEventSupport( this.processEventSupport );
}
for( Map.Entry<String, Channel> entry : this.channels.entrySet() ) {
wm.registerChannel( entry.getKey(), entry.getValue() );
}
// final InternalFactHandle handle = wm.getFactHandleFactory().newFactHandle( InitialFactImpl.getInstance(),
// wm.getObjectTypeConfigurationRegistry().getObjectTypeConf( EntryPointId.DEFAULT,
// InitialFactImpl.getInstance() ),
// wm,
// wm );
//
// wm.queueWorkingMemoryAction( new WorkingMemoryReteAssertAction( handle,
// false,
// true,
// null,
// null ) );
return ksession;
} finally {
this.ruleBase.readUnlock();
}
}
private void registerSystemListeners(AbstractWorkingMemory wm) {
for (org.drools.core.event.AgendaEventListener listener : wm.getAgendaEventSupport().getEventListeners()) {
this.agendaEventSupport.addEventListener(listener);
}
for (org.drools.core.event.WorkingMemoryEventListener listener : wm.getWorkingMemoryEventSupport().getEventListeners()) {
this.workingMemoryEventSupport.addEventListener(listener);
}
InternalProcessRuntime processRuntime = wm.getProcessRuntime();
if ( processRuntime != null ) {
for ( ProcessEventListener listener : processRuntime.getProcessEventListeners() ) {
this.processEventSupport.addEventListener( listener );
}
}
}
private void registerCustomListeners() {
if ( mappedAgendaListeners != null ) {
for (org.drools.core.event.AgendaEventListener agendaListener : mappedAgendaListeners.values()) {
this.agendaEventSupport.addEventListener( agendaListener );
}
}
if ( mappedWorkingMemoryListeners != null ) {
for (org.drools.core.event.WorkingMemoryEventListener wmListener : mappedWorkingMemoryListeners.values()) {
this.workingMemoryEventSupport.addEventListener( wmListener );
}
}
if ( cachedProcessEventListener != null ) {
for (ProcessEventListener processListener : cachedProcessEventListener) {
this.processEventSupport.addEventListener( processListener );
}
}
}
public void addEventListener(AgendaEventListener listener) {
registerAgendaEventListener( listener, new AgendaEventListenerWrapper( listener ) );
}
public void addAgendaEventListener(org.drools.core.event.AgendaEventListener listener) {
registerAgendaEventListener( new AgendaEventListenerPlaceholder(), listener );
}
private void registerAgendaEventListener(AgendaEventListener listener, org.drools.core.event.AgendaEventListener wrapper) {
if ( this.mappedAgendaListeners == null ) {
this.mappedAgendaListeners = new IdentityHashMap<AgendaEventListener, org.drools.core.event.AgendaEventListener>();
}
this.mappedAgendaListeners.put(listener, wrapper);
}
public Collection<AgendaEventListener> getAgendaEventListeners() {
if ( this.mappedAgendaListeners == null ) {
this.mappedAgendaListeners = new IdentityHashMap<AgendaEventListener, org.drools.core.event.AgendaEventListener>();
}
return Collections.unmodifiableCollection( this.mappedAgendaListeners.keySet() );
}
public void removeEventListener(AgendaEventListener listener) {
if ( this.mappedAgendaListeners != null ) {
org.drools.core.event.AgendaEventListener wrapper = this.mappedAgendaListeners.remove( listener );
this.agendaEventSupport.removeEventListener( wrapper );
}
}
public void addWorkingMemoryEventListener(org.drools.core.event.WorkingMemoryEventListener listener) {
registerRuleRuntimeEventListener(new RuleRuntimeEventListenerPlaceholder(), listener);
}
/**
* @deprecated
*/
public void addEventListener(WorkingMemoryEventListener listener) {
addEventListener((RuleRuntimeEventListener) listener);
}
public void addEventListener(RuleRuntimeEventListener listener) {
registerRuleRuntimeEventListener(listener, new StatefulKnowledgeSessionImpl.RuleRuntimeEventListenerWrapper(listener));
}
private void registerRuleRuntimeEventListener(RuleRuntimeEventListener listener, org.drools.core.event.WorkingMemoryEventListener wrapper) {
if ( this.mappedWorkingMemoryListeners == null ) {
this.mappedWorkingMemoryListeners = new IdentityHashMap<RuleRuntimeEventListener, org.drools.core.event.WorkingMemoryEventListener>();
}
this.mappedWorkingMemoryListeners.put( listener, wrapper );
}
/**
* @deprecated
*/
public void removeEventListener(WorkingMemoryEventListener listener) {
removeEventListener((RuleRuntimeEventListener) listener);
}
public void removeEventListener(RuleRuntimeEventListener listener) {
if ( this.mappedWorkingMemoryListeners != null ) {
org.drools.core.event.WorkingMemoryEventListener wrapper = this.mappedWorkingMemoryListeners.remove( listener );
this.workingMemoryEventSupport.removeEventListener( wrapper );
}
}
/**
* @deprecated
*/
public Collection<WorkingMemoryEventListener> getWorkingMemoryEventListeners() {
Collection<WorkingMemoryEventListener> workingMemoryEventListeners = new ArrayList<WorkingMemoryEventListener>();
workingMemoryEventListeners.addAll(getRuleRuntimeEventListeners());
return workingMemoryEventListeners;
}
public Collection<RuleRuntimeEventListener> getRuleRuntimeEventListeners() {
if ( this.mappedWorkingMemoryListeners == null ) {
this.mappedWorkingMemoryListeners = new IdentityHashMap<RuleRuntimeEventListener, org.drools.core.event.WorkingMemoryEventListener>();
}
return Collections.unmodifiableCollection( this.mappedWorkingMemoryListeners.keySet() );
}
public void addEventListener(ProcessEventListener listener) {
if ( this.cachedProcessEventListener == null ) {
this.cachedProcessEventListener = new HashSet<ProcessEventListener>();
}
this.cachedProcessEventListener.add(listener);
this.processEventSupport.addEventListener( listener );
}
public Collection<ProcessEventListener> getProcessEventListeners() {
return Collections.unmodifiableCollection( this.cachedProcessEventListener );
}
public void removeEventListener(ProcessEventListener listener) {
if (this.cachedProcessEventListener != null) {
this.cachedProcessEventListener.remove(listener);
}
this.processEventSupport.removeEventListener( listener );
}
public void setGlobal(String identifier,
Object value) {
this.sessionGlobals.setGlobal( identifier,
value );
}
public Globals getGlobals() {
return this.sessionGlobals;
}
@Override
public void registerChannel(String name,
Channel channel) {
this.channels.put( name, channel );
}
@Override
public void unregisterChannel(String name) {
this.channels.remove( name );
}
@Override
public Map<String, Channel> getChannels() {
return Collections.unmodifiableMap( this.channels );
}
@Override
public KieBase getKieBase() {
return newWorkingMemory().getKieBase();
}
public <T> T execute(Command<T> command) {
newWorkingMemory();
FixedKnowledgeCommandContext context = new FixedKnowledgeCommandContext( new ContextImpl( "ksession",
null ),
null,
null,
ksession,
null );
try {
((StatefulKnowledgeSessionImpl) ksession).session.startBatchExecution( new ExecutionResultImpl() );
Object o = ((GenericCommand) command).execute( context );
// did the user take control of fireAllRules, if not we will auto execute
boolean autoFireAllRules = true;
if ( command instanceof FireAllRulesCommand ) {
autoFireAllRules = false;
} else if ( command instanceof BatchExecutionCommandImpl ) {
for ( Command nestedCmd : ((BatchExecutionCommandImpl) command).getCommands() ) {
if ( nestedCmd instanceof FireAllRulesCommand ) {
autoFireAllRules = false;
break;
}
}
}
if ( autoFireAllRules ) {
ksession.fireAllRules();
}
if ( command instanceof BatchExecutionCommandImpl ) {
ExecutionResults result = ((StatefulKnowledgeSessionImpl) ksession).session.getExecutionResult();
return (T) result;
} else {
return (T) o;
}
} finally {
((StatefulKnowledgeSessionImpl) ksession).session.endBatchExecution();
dispose();
}
}
public void execute(Object object) {
newWorkingMemory();
try {
ksession.insert( object );
ksession.fireAllRules();
} finally {
dispose();
}
}
public void execute(Iterable objects) {
newWorkingMemory();
try {
for ( Object object : objects ) {
ksession.insert( object );
}
ksession.fireAllRules();
} finally {
dispose();
}
}
public Environment getEnvironment() {
return environment;
}
protected void dispose( ) {
AbstractWorkingMemory wm = (AbstractWorkingMemory) ((StatefulKnowledgeSessionImpl) ksession).getInternalWorkingMemory();
for ( org.drools.core.event.AgendaEventListener listener : wm.getAgendaEventSupport().getEventListeners() ) {
this.agendaEventSupport.removeEventListener( listener );
}
for ( org.drools.core.event.WorkingMemoryEventListener listener: wm.getWorkingMemoryEventSupport().getEventListeners() ) {
this.workingMemoryEventSupport.removeEventListener( listener );
}
InternalProcessRuntime processRuntime = wm.getProcessRuntime();
if ( processRuntime != null ) {
for ( ProcessEventListener listener: processRuntime.getProcessEventListeners() ) {
this.processEventSupport.removeEventListener( listener );
}
}
initialized = false;
ksession.dispose();
ksession = null;
}
private static class AgendaEventListenerPlaceholder implements AgendaEventListener {
@Override
public void matchCreated(MatchCreatedEvent event) { }
@Override
public void matchCancelled(MatchCancelledEvent event) { }
@Override
public void beforeMatchFired(BeforeMatchFiredEvent event) { }
@Override
public void afterMatchFired(AfterMatchFiredEvent event) { }
@Override
public void agendaGroupPopped(AgendaGroupPoppedEvent event) { }
@Override
public void agendaGroupPushed(AgendaGroupPushedEvent event) { }
@Override
public void beforeRuleFlowGroupActivated(RuleFlowGroupActivatedEvent event) { }
@Override
public void afterRuleFlowGroupActivated(RuleFlowGroupActivatedEvent event) { }
@Override
public void beforeRuleFlowGroupDeactivated(RuleFlowGroupDeactivatedEvent event) { }
@Override
public void afterRuleFlowGroupDeactivated(RuleFlowGroupDeactivatedEvent event) { }
}
private static class RuleRuntimeEventListenerPlaceholder implements RuleRuntimeEventListener {
@Override
public void objectInserted(ObjectInsertedEvent event) { }
@Override
public void objectUpdated(ObjectUpdatedEvent event) { }
@Override
public void objectDeleted(ObjectDeletedEvent event) { }
}
}