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/*
* Copyright (c) 2009-2013, 2016, 2017, 2021 Eike Stepper (Loehne, 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:
* Simon McDuff - initial API and implementation
* Eike Stepper - maintenance
*/
package org.eclipse.emf.cdo.server.internal.net4j.protocol;
import org.eclipse.emf.cdo.common.id.CDOIDReference;
import org.eclipse.emf.cdo.common.protocol.CDODataInput;
import org.eclipse.emf.cdo.common.protocol.CDODataOutput;
import org.eclipse.emf.cdo.common.protocol.CDOProtocolConstants;
import org.eclipse.emf.cdo.common.util.CDOQueryInfo;
import org.eclipse.emf.cdo.internal.common.CDOQueryInfoImpl;
import org.eclipse.emf.cdo.server.IQueryHandler;
import org.eclipse.emf.cdo.server.IQueryHandler.PotentiallySlow;
import org.eclipse.emf.cdo.spi.server.InternalQueryManager;
import org.eclipse.emf.cdo.spi.server.InternalQueryResult;
import org.eclipse.emf.cdo.spi.server.InternalView;
import java.io.IOException;
import java.util.Map;
/**
* @author Simon McDuff
*/
public class QueryIndication extends CDOServerReadIndication
{
private boolean xrefs;
private boolean disableResponseFlushing;
private boolean disableResponseTimeout;
private InternalQueryResult queryResult;
public QueryIndication(CDOServerProtocol protocol)
{
super(protocol, CDOProtocolConstants.SIGNAL_QUERY);
}
@Override
protected void indicating(CDODataInput in) throws IOException
{
int viewID = in.readXInt();
InternalView view = getView(viewID);
CDOQueryInfo queryInfo = new CDOQueryInfoImpl(in);
InternalQueryManager queryManager = getRepository().getQueryManager();
queryResult = queryManager.execute(view, queryInfo);
String queryLanguage = queryInfo.getQueryLanguage();
xrefs = queryLanguage.equals(CDOProtocolConstants.QUERY_LANGUAGE_XREFS);
Map<String, Object> parameters = queryInfo.getParameters();
disableResponseFlushing = xrefs || Boolean.TRUE.equals(parameters.get(CDOQueryInfo.PARAM_DISABLE_RESPONSE_FLUSHING));
disableResponseTimeout = Boolean.TRUE.equals(parameters.get(CDOQueryInfo.PARAM_DISABLE_RESPONSE_TIMEOUT));
if (!disableResponseTimeout)
{
IQueryHandler handler = queryResult.getQueryHandler();
if (handler instanceof PotentiallySlow)
{
PotentiallySlow potentiallySlow = (PotentiallySlow)handler;
if (potentiallySlow.isSlow(queryInfo))
{
disableResponseTimeout = true;
}
}
}
}
@Override
protected void responding(CDODataOutput out) throws IOException
{
if (disableResponseTimeout)
{
try
{
monitor(1, 10, () -> doRespond(out));
}
catch (IOException | RuntimeException | Error ex)
{
throw ex;
}
catch (Exception ex)
{
throw new IOException(ex);
}
}
else
{
doRespond(out);
}
}
private void doRespond(CDODataOutput out) throws IOException
{
// Return queryID immediately.
out.writeXInt(queryResult.getQueryID());
flushUnlessDisabled();
for (;;)
{
Object object;
try
{
if (!queryResult.hasNext())
{
break;
}
object = queryResult.next();
}
catch (Throwable ex)
{
out.writeBoolean(true);
out.writeCDORevisionOrPrimitive(ex);
break;
}
out.writeBoolean(true);
if (xrefs)
{
CDOIDReference idReference = (CDOIDReference)object;
out.writeCDOIDReference(idReference);
}
else
{
out.writeCDORevisionOrPrimitive(object);
}
try
{
if (queryResult.peek() == null)
{
flushUnlessDisabled();
}
}
catch (IOException ex)
{
throw ex;
}
catch (Throwable ex)
{
// Ignore execution exceptions from peek(); they're handled.
}
}
// No more results.
out.writeBoolean(false);
}
private void flushUnlessDisabled() throws IOException
{
if (!disableResponseFlushing)
{
flush();
}
}
}
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