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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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:
* Simon McDuff - initial API and implementation
**************************************************************************/
package org.eclipse.emf.cdo.internal.server;
import org.eclipse.emf.cdo.common.query.CDOQueryInfo;
import org.eclipse.emf.cdo.common.query.CDOQueryQueue;
import org.eclipse.emf.cdo.internal.server.bundle.OM;
import org.eclipse.emf.cdo.server.IStoreReader;
import org.eclipse.emf.cdo.server.IView;
import org.eclipse.emf.cdo.server.StoreUtil;
import org.eclipse.net4j.util.collection.CloseableIterator;
import org.eclipse.net4j.util.container.SingleDeltaContainerEvent;
import org.eclipse.net4j.util.container.IContainerDelta.Kind;
import org.eclipse.net4j.util.event.IEvent;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
/**
* @author Simon McDuff
* @since 2.0
*/
public class QueryManager extends Lifecycle
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG_SESSION, QueryManager.class);
private Map<Long, QueryContext> queryContexts = new ConcurrentHashMap<Long, QueryContext>();
private Map<Long, Future<?>> associateThreads = new ConcurrentHashMap<Long, Future<?>>();
private ExecutorService executors = Executors.newFixedThreadPool(10);
private long nextQuery = 0;
public QueryManager()
{
}
synchronized long nextQuery()
{
return nextQuery++;
}
private Future<?> execute(QueryContext queryContext)
{
Future<?> future = executors.submit(queryContext);
register(queryContext, future);
return future;
}
class QueryContext implements Runnable
{
QueryResult queryResult;
IListener listener = null;
IStoreReader reader = null;
public QueryContext(IStoreReader reader, QueryResult queryResult)
{
this.queryResult = queryResult;
this.reader = reader;
}
private void removeListener()
{
final IView view = (IView)getQueryResult().getView();
view.getSession().removeListener(listener);
listener = null;
}
private void addListener()
{
if (listener == null)
{
final IView view = (IView)getQueryResult().getView();
listener = new IListener()
{
public void notifyEvent(IEvent event)
{
if (event instanceof SingleDeltaContainerEvent)
{
SingleDeltaContainerEvent<?> deltaEvent = (SingleDeltaContainerEvent<?>)event;
if (deltaEvent.getDeltaKind() == Kind.REMOVED && deltaEvent.getDeltaElement() == view)
{
// Cancel the query when view is closing
cancel(getQueryResult().getQueryID());
}
}
}
};
// Add listener to the session
view.getSession().addListener(listener);
}
}
public void run()
{
CDOQueryQueue<Object> resultQueue = queryResult.getQueue();
CloseableIterator<Object> itrResult = null;
try
{
itrResult = reader.createQueryIterator(queryResult.getQueryInfo());
int maxResult = queryResult.getQueryInfo().getMaxResults();
if (maxResult < 0)
{
maxResult = Integer.MAX_VALUE;
}
for (int i = 0; i < maxResult && itrResult.hasNext(); i++)
{
resultQueue.add(itrResult.next());
}
}
catch (Throwable exception)
{
resultQueue.setException(exception);
}
finally
{
resultQueue.close();
if (itrResult != null) itrResult.close();
unregister(this);
}
}
public QueryResult getQueryResult()
{
return queryResult;
}
}
public QueryResult execute(IView view, CDOQueryInfo queryInfo)
{
QueryResult queryResult = new QueryResult(view, queryInfo, nextQuery());
QueryContext queryContext = new QueryContext(StoreUtil.getReader(), queryResult);
execute(queryContext);
return queryResult;
}
public boolean isRunning(long queryID)
{
QueryContext queryContext = queryContexts.get(queryID);
return queryContext != null;
}
public void cancel(long queryID)
{
Future<?> queryContext = associateThreads.get(queryID);
if (queryContext == null || queryContext.isDone())
throw new RuntimeException("Query " + queryID + " is not running anymore");
if (TRACER.isEnabled()) TRACER.trace("Stopping QueryNative thread: " + queryContext);
queryContext.cancel(true);
}
synchronized public void register(final QueryContext queryContext, Future<?> future)
{
queryContexts.put(queryContext.getQueryResult().getQueryID(), queryContext);
associateThreads.put(queryContext.getQueryResult().getQueryID(), future);
queryContext.addListener();
}
synchronized public void unregister(final QueryContext queryContext)
{
queryContexts.remove(queryContext.getQueryResult().getQueryID());
associateThreads.remove(queryContext.getQueryResult().getQueryID());
queryContext.removeListener();
}
}
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