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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.spi.server;
import org.eclipse.emf.cdo.internal.server.bundle.OM;
import org.eclipse.emf.cdo.server.ISession;
import org.eclipse.emf.cdo.server.IStore;
import org.eclipse.emf.cdo.server.IView;
import org.eclipse.net4j.util.lifecycle.LifecycleUtil;
import org.eclipse.net4j.util.om.log.OMLogger;
import java.util.concurrent.ConcurrentLinkedQueue;
/**
* @author Eike Stepper
* @since 2.0
*/
public class StoreAccessorPool
{
/**
* The {@link IStore store} instance that manages this pool.
*/
private IStore store;
/**
* The pooling context of this pool. An instance of either {@link ISession} or {@link IView}, or <code>null</code> if
* this pool is not contextual.
*/
private Object context;
private ConcurrentLinkedQueue<StoreAccessor> accessors = new ConcurrentLinkedQueue<StoreAccessor>();
public StoreAccessorPool(IStore store, Object context)
{
this.store = store;
this.context = context;
}
public IStore getStore()
{
return store;
}
public Object getContext()
{
return context;
}
/**
* Passivates the given {@link StoreAccessor store accessor} and adds it to this pool.
*/
public void addStoreAccessor(StoreAccessor storeAccessor)
{
try
{
storeAccessor.doPassivate();
accessors.add(storeAccessor);
}
catch (Exception ex)
{
OM.LOG.error(ex);
}
}
/**
* Returns a {@link StoreAccessor store accessor} from this pool if one is available, or <code>null</code> otherwise.
* If a store accessor is available it is removed from this pool and its unpassivate method is called.
*
* @since 3.0
*/
public StoreAccessor removeStoreAccessor(Object context)
{
StoreAccessor accessor = accessors.poll();
if (accessor != null)
{
try
{
accessor.doUnpassivate();
accessor.setContext(context);
}
catch (Exception ex)
{
OM.LOG.error(ex);
return null;
}
}
return accessor;
}
/**
* Deactivates all contained {@link StoreAccessor store accessors} and clears this pool.
*/
public void dispose()
{
for (;;)
{
StoreAccessor accessor = accessors.poll();
if (accessor == null)
{
break;
}
LifecycleUtil.deactivate(accessor, OMLogger.Level.WARN);
}
context = null;
store = null;
}
}
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