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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
* Eike Stepper - maintenance
**************************************************************************/
package org.eclipse.emf.internal.cdo.protocol;
import org.eclipse.emf.cdo.common.CDODataInput;
import org.eclipse.emf.cdo.common.CDODataOutput;
import org.eclipse.emf.cdo.common.CDOProtocolConstants;
import org.eclipse.emf.cdo.common.util.CDOQueryQueue;
import org.eclipse.emf.cdo.internal.common.query.CDOQueryInfoImpl;
import org.eclipse.emf.internal.cdo.bundle.OM;
import org.eclipse.emf.internal.cdo.query.CDOAbstractQueryIteratorImpl;
import org.eclipse.net4j.util.io.IORuntimeException;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* @author Simon McDuff
*/
public class QueryRequest extends CDOClientRequest<Object>
{
private static final ContextTracer PROTOCOL_TRACER = new ContextTracer(OM.DEBUG_PROTOCOL, QueryRequest.class);
private int viewID;
private CDOAbstractQueryIteratorImpl<?> queryResult;
public QueryRequest(CDOClientProtocol protocol, int viewID, CDOAbstractQueryIteratorImpl<?> queryResult)
{
super(protocol, CDOProtocolConstants.SIGNAL_QUERY);
this.viewID = viewID;
this.queryResult = queryResult;
}
@Override
protected void requesting(CDODataOutput out) throws IOException
{
out.writeInt(viewID);
// TODO Simon: Move I/O logic to CDODataInput/OutputStream?!
((CDOQueryInfoImpl)queryResult.getQueryInfo()).write(out);
}
@Override
protected Object confirming(CDODataInput in) throws IOException
{
int queryID = in.readInt();
queryResult.setQueryID(queryID);
CDOQueryQueue<Object> resultQueue = queryResult.getQueue();
List<Object> result = new ArrayList<Object>();
try
{
int numberOfObjectsReceived = 0;
while (true)
{
byte state = in.readByte();
if (state == CDOProtocolConstants.QUERY_MORE_OBJECT)
{
// result
Object element = in.readCDORevisionOrPrimitive();
resultQueue.add(element);
numberOfObjectsReceived++;
}
else if (state == CDOProtocolConstants.QUERY_DONE)
{
// End of result
break;
}
else if (state == CDOProtocolConstants.QUERY_EXCEPTION)
{
// Exception on the server
String exceptionString = in.readString();
throw new IORuntimeException(exceptionString);
}
else
{
throw new IORuntimeException("Illegal state: " + state);
}
}
if (PROTOCOL_TRACER.isEnabled())
{
PROTOCOL_TRACER.format("Query executed [{0} elements received]", numberOfObjectsReceived);
}
}
catch (RuntimeException ex)
{
resultQueue.setException(ex);
}
catch (Throwable throwable)
{
resultQueue.setException(new RuntimeException(throwable.getMessage(), throwable));
}
finally
{
resultQueue.close();
}
return result;
}
}
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