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/*****************************************************************************
* Copyright (c) 2017 CEA LIST and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* CEA LIST - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.moka.fuml.control.queue;
import org.eclipse.papyrus.moka.fuml.Semantics.CommonBehaviors.BasicBehaviors.IExecution;
import org.eclipse.papyrus.moka.fuml.control.execution.RootExecution;
public class ExecutionLoop {
// The queue handled by the execution manager
protected ExecutionQueue queue;
public ExecutionLoop(){
this.queue = new ExecutionQueue();
}
public void enqueue(IExecution execution){
// Add an execution to the queue
this.queue.offer(execution);
}
public void start(RootExecution execution){
// Add an execution to the queue and start the execution
// loop.
this.queue.clear();
this.enqueue(execution);
this.run();
}
public void run(){
// Execute all execution in the queue until
// the queue is empty
while(!this.queue.isEmpty()){
this.runNext();
}
}
public boolean step(){
// Run the execution at the head of the queue
return this.runNext();
}
protected final boolean runNext(){
// If the queue is not empty, then the head execution is removed
// and executed. True is returned. False is only returned if the
// queue was empty.
if(!this.queue.isEmpty()){
IExecution nextExecution = this.queue.poll();
nextExecution.execute();
return true;
}
return false;
}
}
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