package org.drools.process.instance.impl;
/*
* Copyright 2005 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.
*/
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.drools.Agenda;
import org.drools.WorkingMemory;
import org.drools.common.InternalRuleBase;
import org.drools.common.InternalWorkingMemory;
import org.drools.definition.process.Process;
import org.drools.process.core.Context;
import org.drools.process.core.ContextContainer;
import org.drools.process.instance.ContextInstance;
import org.drools.process.instance.ProcessInstance;
/**
* Default implementation of a process instance.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public abstract class ProcessInstanceImpl implements ProcessInstance, Serializable {
private static final long serialVersionUID = 4L;
private long id;
private String processId;
private transient Process process;
private int state = STATE_PENDING;
private Map<String, ContextInstance> contextInstances = new HashMap<String, ContextInstance>();
private Map<String, List<ContextInstance>> subContextInstances = new HashMap<String, List<ContextInstance>>();
private InternalWorkingMemory workingMemory;
public void setId(final long id) {
this.id = id;
}
public long getId() {
return this.id;
}
public void setProcess(final Process process) {
this.processId = process.getId();
this.process = ( Process ) process;
}
public Process getProcess() {
if (this.process == null) {
this.process = ( Process ) ((InternalRuleBase) workingMemory.getRuleBase())
.getProcess(processId);
}
return this.process;
}
public void setProcessId(String processId) {
this.processId = processId;
}
public String getProcessId() {
return processId;
}
public String getProcessName() {
return getProcess().getName();
}
public void setState(final int state) {
this.state = state;
}
public int getState() {
return this.state;
}
public void setWorkingMemory(final InternalWorkingMemory workingMemory) {
if ( this.workingMemory != null ) {
throw new IllegalArgumentException( "A working memory can only be set once." );
}
this.workingMemory = workingMemory;
}
public WorkingMemory getWorkingMemory() {
return this.workingMemory;
}
public Agenda getAgenda() {
if (getWorkingMemory() == null) {
return null;
}
return getWorkingMemory().getAgenda();
}
public ContextContainer getContextContainer() {
return ( ContextContainer ) getProcess();
}
public void setContextInstance(String contextId, ContextInstance contextInstance) {
this.contextInstances.put(contextId, contextInstance);
}
public ContextInstance getContextInstance(String contextId) {
ContextInstance contextInstance = this.contextInstances.get(contextId);
if (contextInstance != null) {
return contextInstance;
}
Context context = ((ContextContainer)getProcess()).getDefaultContext(contextId);
if (context != null) {
contextInstance = getContextInstance(context);
return contextInstance;
}
return null;
}
public List<ContextInstance> getContextInstances(String contextId) {
return this.subContextInstances.get(contextId);
}
public void addContextInstance(String contextId, ContextInstance contextInstance) {
List<ContextInstance> list = this.subContextInstances.get(contextId);
if (list == null) {
list = new ArrayList<ContextInstance>();
this.subContextInstances.put(contextId, list);
}
list.add(contextInstance);
}
public ContextInstance getContextInstance(String contextId, long id) {
List<ContextInstance> contextInstances = subContextInstances.get(contextId);
if (contextInstances != null) {
for (ContextInstance contextInstance: contextInstances) {
if (contextInstance.getContextId() == id) {
return contextInstance;
}
}
}
return null;
}
public ContextInstance getContextInstance(final Context context) {
ContextInstanceFactoryRegistry contextRegistry =
((InternalRuleBase) getWorkingMemory().getRuleBase())
.getConfiguration().getProcessContextInstanceFactoryRegistry();
ContextInstanceFactory conf = contextRegistry.getContextInstanceFactory(context);
if (conf == null) {
throw new IllegalArgumentException("Illegal context type (registry not found): " + context.getClass());
}
ContextInstance contextInstance = (ContextInstance) conf.getContextInstance(context, this, this);
if (contextInstance == null) {
throw new IllegalArgumentException("Illegal context type (instance not found): " + context.getClass());
}
return contextInstance;
}
public void signalEvent(String type, Object event) {
}
public void start() {
synchronized (this) {
if ( getState() != ProcessInstanceImpl.STATE_PENDING ) {
throw new IllegalArgumentException( "A process instance can only be started once" );
}
setState( ProcessInstanceImpl.STATE_ACTIVE );
internalStart();
}
}
protected abstract void internalStart();
public void disconnect() {
workingMemory.getProcessInstanceManager().internalRemoveProcessInstance(this);
process = null;
workingMemory = null;
}
public void reconnect() {
workingMemory.getProcessInstanceManager().internalAddProcessInstance(this);
}
public String[] getEventTypes() {
return null;
}
public String toString() {
final StringBuffer b = new StringBuffer( "ProcessInstance " );
b.append( getId() );
b.append( " [processId=" );
b.append( this.process.getId() );
b.append( ",state=" );
b.append( this.state );
b.append( "]" );
return b.toString();
}
}