/*
* 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.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Map;
import org.drools.SessionConfiguration;
import org.drools.agent.KnowledgeAgent;
import org.drools.base.MapGlobalResolver;
import org.drools.command.Command;
import org.drools.command.impl.ContextImpl;
import org.drools.command.impl.GenericCommand;
import org.drools.command.impl.FixedKnowledgeCommandContext;
import org.drools.command.runtime.BatchExecutionCommandImpl;
import org.drools.command.runtime.rule.FireAllRulesCommand;
import org.drools.common.InternalFactHandle;
import org.drools.common.InternalRuleBase;
import org.drools.event.AgendaEventSupport;
import org.drools.event.ProcessEventSupport;
import org.drools.event.WorkingMemoryEventSupport;
import org.drools.event.process.ProcessEventListener;
import org.drools.event.rule.AgendaEventListener;
import org.drools.event.rule.WorkingMemoryEventListener;
import org.drools.impl.StatefulKnowledgeSessionImpl.AgendaEventListenerWrapper;
import org.drools.impl.StatefulKnowledgeSessionImpl.WorkingMemoryEventListenerWrapper;
import org.drools.reteoo.InitialFactImpl;
import org.drools.reteoo.ReteooWorkingMemory;
import org.drools.reteoo.ReteooWorkingMemory.WorkingMemoryReteAssertAction;
import org.drools.rule.EntryPoint;
import org.drools.runtime.Environment;
import org.drools.runtime.ExecutionResults;
import org.drools.runtime.Globals;
import org.drools.runtime.KnowledgeSessionConfiguration;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.StatelessKnowledgeSession;
import org.drools.runtime.impl.ExecutionResultImpl;
import org.drools.runtime.process.InternalProcessRuntime;
import org.drools.runtime.rule.AgendaFilter;
public class StatelessKnowledgeSessionImpl
implements
StatelessKnowledgeSession {
private InternalRuleBase ruleBase;
private KnowledgeAgent kagent;
private AgendaFilter agendaFilter;
private MapGlobalResolver sessionGlobals = new MapGlobalResolver();
/** The event mapping */
public Map<WorkingMemoryEventListener, WorkingMemoryEventListenerWrapper> mappedWorkingMemoryListeners;
public Map<AgendaEventListener, AgendaEventListenerWrapper> mappedAgendaListeners;
/** The event support */
public AgendaEventSupport agendaEventSupport = new AgendaEventSupport();
public WorkingMemoryEventSupport workingMemoryEventSupport = new WorkingMemoryEventSupport();
public ProcessEventSupport processEventSupport = new ProcessEventSupport();
private boolean initialized;
private KnowledgeSessionConfiguration conf;
private Environment environment;
public StatelessKnowledgeSessionImpl() {
}
public StatelessKnowledgeSessionImpl(final InternalRuleBase ruleBase,
final KnowledgeAgent kagent,
final KnowledgeSessionConfiguration conf) {
this.ruleBase = ruleBase;
this.kagent = kagent;
this.conf = (conf != null) ? conf : SessionConfiguration.getDefaultInstance();
this.environment = EnvironmentFactory.newEnvironment();
if ( this.ruleBase != null ) {
// FIXME: this same code exists in ReteooRuleBase#newStatelessSession()
this.ruleBase.lock();
try {
if ( ruleBase.getConfiguration().isSequential() ) {
this.ruleBase.getReteooBuilder().order();
}
} finally {
this.ruleBase.unlock();
}
}
}
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 ( 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 {
ReteooWorkingMemory wm = new ReteooWorkingMemory( 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
StatefulKnowledgeSessionImpl 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
for (org.drools.event.AgendaEventListener listener: wm.getAgendaEventSupport().getEventListeners()) {
this.agendaEventSupport.addEventListener(listener);
}
for (org.drools.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);
}
}
initialized = true;
}
wm.setAgendaEventSupport( this.agendaEventSupport );
wm.setWorkingMemoryEventSupport( this.workingMemoryEventSupport );
InternalProcessRuntime processRuntime = wm.getProcessRuntime();
if (processRuntime != null) {
processRuntime.setProcessEventSupport( this.processEventSupport );
}
final InternalFactHandle handle = wm.getFactHandleFactory().newFactHandle( InitialFactImpl.getInstance(),
wm.getObjectTypeConfigurationRegistry().getObjectTypeConf( EntryPoint.DEFAULT,
InitialFactImpl.getInstance() ),
wm,
wm);
wm.queueWorkingMemoryAction( new WorkingMemoryReteAssertAction( handle,
false,
true,
null,
null ) );
return ksession;
} finally {
this.ruleBase.readUnlock();
}
}
public void addEventListener(AgendaEventListener listener) {
if ( this.mappedAgendaListeners == null ) {
this.mappedAgendaListeners = new IdentityHashMap<AgendaEventListener, AgendaEventListenerWrapper>();
}
AgendaEventListenerWrapper wrapper = new AgendaEventListenerWrapper( listener );
this.mappedAgendaListeners.put( listener,
wrapper );
this.agendaEventSupport.addEventListener( wrapper );
}
public Collection<AgendaEventListener> getAgendaEventListeners() {
if ( this.mappedAgendaListeners == null ) {
this.mappedAgendaListeners = new IdentityHashMap<AgendaEventListener, AgendaEventListenerWrapper>();
}
return Collections.unmodifiableCollection( this.mappedAgendaListeners.keySet() );
}
public void removeEventListener(AgendaEventListener listener) {
if ( this.mappedAgendaListeners == null ) {
this.mappedAgendaListeners = new IdentityHashMap<AgendaEventListener, AgendaEventListenerWrapper>();
}
AgendaEventListenerWrapper wrapper = this.mappedAgendaListeners.remove( listener );
this.agendaEventSupport.removeEventListener( wrapper );
}
public void addEventListener(WorkingMemoryEventListener listener) {
if ( this.mappedWorkingMemoryListeners == null ) {
this.mappedWorkingMemoryListeners = new IdentityHashMap<WorkingMemoryEventListener, WorkingMemoryEventListenerWrapper>();
}
WorkingMemoryEventListenerWrapper wrapper = new WorkingMemoryEventListenerWrapper( listener );
this.mappedWorkingMemoryListeners.put( listener,
wrapper );
this.workingMemoryEventSupport.addEventListener( wrapper );
}
public void removeEventListener(WorkingMemoryEventListener listener) {
if ( this.mappedWorkingMemoryListeners == null ) {
this.mappedWorkingMemoryListeners = new IdentityHashMap<WorkingMemoryEventListener, WorkingMemoryEventListenerWrapper>();
}
WorkingMemoryEventListenerWrapper wrapper = this.mappedWorkingMemoryListeners.remove( listener );
this.workingMemoryEventSupport.removeEventListener( wrapper );
}
public Collection<WorkingMemoryEventListener> getWorkingMemoryEventListeners() {
if ( this.mappedWorkingMemoryListeners == null ) {
this.mappedWorkingMemoryListeners = new IdentityHashMap<WorkingMemoryEventListener, WorkingMemoryEventListenerWrapper>();
}
return Collections.unmodifiableCollection( this.mappedWorkingMemoryListeners.keySet() );
}
public void addEventListener(ProcessEventListener listener) {
this.processEventSupport.addEventListener(listener);
}
public Collection<ProcessEventListener> getProcessEventListeners() {
return this.processEventSupport.getEventListeners();
}
public void removeEventListener(ProcessEventListener listener) {
this.processEventSupport.removeEventListener(listener);
}
public void setGlobal(String identifier,
Object value) {
this.sessionGlobals.setGlobal( identifier,
value );
}
public Globals getGlobals() {
return this.sessionGlobals;
}
public <T> T execute(Command<T> command) {
StatefulKnowledgeSession ksession = 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();
ksession.dispose();
}
}
public void execute(Object object) {
StatefulKnowledgeSession ksession = newWorkingMemory();
ksession.insert( object );
ksession.fireAllRules( );
ksession.dispose();
}
public void execute(Iterable objects) {
StatefulKnowledgeSession ksession = newWorkingMemory();
for ( Object object : objects ) {
ksession.insert( object );
}
ksession.fireAllRules( );
ksession.dispose();
}
public Environment getEnvironment() {
return environment;
}
}