/**
* Copyright 2004-2008 非也
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation。
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses. *
*/
package org.fireflow.kernel.impl;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.fireflow.kernel.IActivityInstance;
import org.fireflow.kernel.IToken;
import org.fireflow.kernel.ITransitionInstance;
import org.fireflow.kernel.KernelException;
import org.fireflow.kernel.event.INodeInstanceEventListener;
import org.fireflow.kernel.event.NodeInstanceEvent;
import org.fireflow.kernel.plugin.IKernelExtension;
import org.fireflow.model.net.Activity;
/**
* @author 非也
*
*/
public class ActivityInstance extends AbstractNodeInstance implements
IActivityInstance {
public transient static final Log log = LogFactory.getLog(ActivityInstance.class);
public transient static final String Extension_Target_Name = "org.fireflow.kernel.ActivityInstance";
public transient static List<String> Extension_Point_Names = new ArrayList<String>();
public transient static final String Extension_Point_NodeInstanceEventListener = "NodeInstanceEventListener";
static {
Extension_Point_Names.add(Extension_Point_NodeInstanceEventListener);
}
private transient Activity activity = null;
public ActivityInstance(Activity a) {
activity = a;
}
public String getId() {
return activity.getId();
}
/* (non-Javadoc)
* @see org.fireflow.kernel.INodeInstance#fire(org.fireflow.kernel.IToken)
*/
public void fire(IToken tk) throws KernelException {
log.debug("The weight of the Entering TransitionInstance is " + tk.getValue());
IToken token = tk;
token.setNodeId(this.getActivity().getId());
//触发TokenEntered事件
NodeInstanceEvent event1 = new NodeInstanceEvent(this);
event1.setToken(tk);
event1.setEventType(NodeInstanceEvent.NODEINSTANCE_TOKEN_ENTERED);//token 来了
fireNodeEvent(event1);
if (token.isAlive()) {//如果token是活动的，那么就保存token，并创建taskinstance
NodeInstanceEvent event = new NodeInstanceEvent(this);
event.setToken(token);
event.setEventType(NodeInstanceEvent.NODEINSTANCE_FIRED);//token 被触发,创建taskinstance，等待
fireNodeEvent(event);
} else {//如果token是dead状态，那么就直接结束当前节点。
this.complete(token, null);
}
}
/* (non-Javadoc)
* @see org.fireflow.kernel.IActivityInstance#complete(org.fireflow.kernel.IToken, org.fireflow.kernel.IActivityInstance)
*/
public void complete(IToken token, IActivityInstance targetActivityInstance) throws KernelException {
NodeInstanceEvent event2 = new NodeInstanceEvent(this);
event2.setToken(token);
event2.setEventType(NodeInstanceEvent.NODEINSTANCE_LEAVING); //token leaving
fireNodeEvent(event2);
token.setFromActivityId(this.getActivity().getId());
if (targetActivityInstance != null) {
token.setStepNumber(token.getStepNumber() + 1);
targetActivityInstance.fire(token);
} else {
//按照定义，activity有且只有一个输出弧，所以此处只进行一次循环。
for (int i = 0; leavingTransitionInstances != null && i < leavingTransitionInstances.size(); i++) {
ITransitionInstance transInst = leavingTransitionInstances.get(i);
transInst.take(token);
}
}
if (token.isAlive()) {
NodeInstanceEvent event = new NodeInstanceEvent(this);
event.setToken(token);
event.setEventType(NodeInstanceEvent.NODEINSTANCE_COMPLETED); //token completed
fireNodeEvent(event);
}
}
public String getExtensionTargetName() {
return Extension_Target_Name;
}
public List<String> getExtensionPointNames() {
return Extension_Point_Names;
}
//TODO extesion是单态还是多实例？单态应该效率高一些。
public void registExtension(IKernelExtension extension) throws RuntimeException {
if (!Extension_Target_Name.equals(extension.getExtentionTargetName())) {
throw new RuntimeException("Error:When construct the ActivityInstance,the Extension_Target_Name is mismatching");
}
if (Extension_Point_NodeInstanceEventListener.equals(extension.getExtentionPointName())) {
if (extension instanceof INodeInstanceEventListener) {
this.eventListeners.add((INodeInstanceEventListener) extension);
} else {
throw new RuntimeException("Error:When construct the ActivityInstance,the extension MUST be a instance of INodeInstanceEventListener");
}
}
}
@Override
public String toString() {
return "ActivityInstance_4_[" + activity.getName() + "]";
}
public Activity getActivity() {
return activity;
}
}