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The Jadex platform package contains implementations of platform services as well as the platform component itself.
package jadex.platform.service.execution;
import java.util.Map;
import jadex.bridge.IInternalAccess;
import jadex.bridge.component.impl.AbstractComponentFeature;
import jadex.bridge.service.BasicService;
import jadex.bridge.service.RequiredServiceInfo;
import jadex.bridge.service.search.SServiceProvider;
import jadex.bridge.service.types.execution.IExecutionService;
import jadex.bridge.service.types.threadpool.IThreadPoolService;
import jadex.commons.SUtil;
import jadex.commons.collection.SCollection;
import jadex.commons.concurrent.Executor;
import jadex.commons.concurrent.IExecutable;
import jadex.commons.future.CounterResultListener;
import jadex.commons.future.DelegationResultListener;
import jadex.commons.future.Future;
import jadex.commons.future.IFuture;
import jadex.commons.future.IResultListener;
/**
* The asynchronous executor service that executes all tasks in separate executors.
*/
public class AsyncExecutionService extends BasicService implements IExecutionService
{
/**
* The possible states of the service.
*/
public enum State
{
CREATED, RUNNING, SHUTDOWN
}
//-------- attributes --------
/** The threadpool. */
protected IThreadPoolService threadpool;
/** The currently waiting tasks (task->executor). */
protected Map executors;
/** The idle future. */
protected Future idlefuture;
/** The state. */
protected State state;
/** The component. */
protected IInternalAccess component;
/** The running (i.e. non-blocked) executors. */
protected Map runningexes;
//-------- constructors --------
/**
* Create a new asynchronous executor service.
*/
public AsyncExecutionService(IInternalAccess component)//, int max)
{
this(component, null);
}
/**
* Create a new asynchronous executor service.
*/
public AsyncExecutionService(IInternalAccess component, Map properties)//, int max)
{
super(component.getComponentIdentifier(), IExecutionService.class, properties);
this.component = component;
this.executors = SCollection.createHashMap();
this.runningexes = SCollection.createHashMap();
this.state = State.CREATED;
}
//-------- methods --------
/**
* Execute a task in its own thread.
* @param task The task to execute.
* (called from arbitrary threads)
*/
public synchronized void execute(final IExecutable task)
{
if(!customIsValid())
{
throw new RuntimeException("Not running. Cannot execute: "+task);
}
Executor exe = executors.get(task);
if(exe==null)
{
exe = new Executor(threadpool, task)
{
// Hack!!! overwritten to know, when executor ends.
public void run()
{
synchronized(AsyncExecutionService.this)
{
// System.err.println("non-idle: "+runningexes.keySet());
runningexes.put(task, this);
}
try
{
super.run();
}
catch(Throwable e)
{
// Shouldn't happen. If it does, it will break simulation time.
System.err.println("Uncatched exception in executable "+executable+": "+SUtil.getExceptionStacktrace(e));
}
Future idf = null;
synchronized(AsyncExecutionService.this)
{
synchronized(this)
{
// Do not remove when a new executor has already been added for the task.
// isRunning() refers to running state of executor!
if(!this.isRunning() && executors!=null && executors.get(task)==this)
{
if(executors!=null && this.getThreadCount()==0)
{
executors.remove(task);
}
runningexes.remove(task);
// System.err.println("after task: "+state+", "+runningexes.keySet());
// When no more executable threads, inform idle commands.
if(state==State.RUNNING && idlefuture!=null && runningexes.isEmpty())
{
idf = idlefuture;
idlefuture = null;
// System.err.println("idle");
}
}
else if(executors!=null && executors.get(task)!=this && runningexes.get(task)==this)
{
runningexes.remove(task);
}
}
}
if(idf!=null)
{
idf.setResult(null);
}
}
// Hack!!! Skip shutdown of platform executor for "boot unstrapping" -> executor will finish after no more steps
public IFuture shutdown()
{
if(task instanceof AbstractComponentFeature && ((AbstractComponentFeature)task).getComponent().getComponentIdentifier().equals(getServiceIdentifier().getProviderId()))
{
return IFuture.DONE;
}
else
{
return super.shutdown();
}
}
};
executors.put(task, exe);
}
if(state==State.RUNNING)
{
boolean exec = exe.execute();
if(exec)
{
runningexes.put(task, exe);
}
}
}
/**
* Cancel a task. Triggers the task to
* be not executed in future.
* @param task The task to execute.
* @param listener The listener.
*/
public synchronized IFuture cancel(final IExecutable task)
{
// todo: repair me: problem is that method can interfere with execute?!
final Future ret = new Future();
if(!customIsValid())
{
throw new RuntimeException("Not running. Cannot cancel: "+task);
}
else
{
final Executor exe = (Executor)executors.get(task);
if(exe!=null)
{
IResultListener lis = new IResultListener()
{
public void resultAvailable(Void result)
{
// todo: do not call listener with holding lock
synchronized(AsyncExecutionService.this)
{
ret.setResult(result);
if(executors!=null)
{
executors.remove(task);
}
}
}
public void exceptionOccurred(Exception exception)
{
// todo: do not call future with holding lock
synchronized(AsyncExecutionService.this)
{
ret.setException(exception);
if(executors!=null)
{
executors.remove(task);
}
}
}
};
exe.shutdown().addResultListener(lis);
}
else
{
ret.setResult(null);
}
}
return ret;
}
/**
* Get the currently running tasks.
*/
public synchronized IExecutable[] getRunningTasks()
{
return (IExecutable[])runningexes.keySet().toArray(new IExecutable[runningexes.size()]);
}
/**
* Start the execution service.
* Resumes all scheduled tasks.
*/
public synchronized IFuture startService()
{
final Future ret = new Future();
super.startService().addResultListener(new DelegationResultListener(ret)
{
public void customResultAvailable(Void result)
{
if(state!=State.CREATED)
{
ret.setException(new RuntimeException("Cannot init service in "+state));
}
else
{
SServiceProvider.getService(component, IThreadPoolService.class, RequiredServiceInfo.SCOPE_PLATFORM, false)
.addResultListener(new IResultListener()
{
public void resultAvailable(IThreadPoolService result)
{
try
{
threadpool = result;
state = State.RUNNING;
ret.setResult(null);
}
catch(RuntimeException e)
{
ret.setException(e);
}
}
public void exceptionOccurred(Exception exception)
{
ret.setException(exception);
}
});
}
}
});
return ret;
}
/**
* Shutdown the executor service.
* // todo: make callable more than once
*/
public synchronized IFuture shutdownService()
{
final Future ret = new Future();
super.shutdownService().addResultListener(new DelegationResultListener(ret)
{
public void customResultAvailable(Void result)
{
if(state==State.SHUTDOWN)
{
ret.setException((new RuntimeException("Already shutdowned.")));
}
else
{
state = State.SHUTDOWN;
IExecutable[] keys = (IExecutable[])executors.keySet()
.toArray(new IExecutable[executors.size()]);
if(keys.length>0)
{
// One listener counts until all executors have shutdowned.
final IResultListener lis = new CounterResultListener(keys.length, new DelegationResultListener(ret));
for(int i=0; i getNextIdleFuture()
{
Future ret;
if(state==State.SHUTDOWN)
{
ret = new Future(new RuntimeException("Shutdown"));
}
else
{
if(idlefuture==null)
idlefuture = new Future();
ret = idlefuture;
}
return ret;
}
}