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/*
* Copyright (c) 2004 - 2012 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:
* Caspar De Groot - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.net4j;
import org.eclipse.net4j.connector.ConnectorException;
import org.eclipse.net4j.connector.IConnector;
/**
* @author Caspar De Groot
*/
public class ReconnectingCDOSessionImpl extends RecoveringCDOSessionImpl
{
private long reconnectInterval = 0;
private int maxReconnectAttempts = Integer.MAX_VALUE;
public ReconnectingCDOSessionImpl()
{
}
public long getReconnectInterval()
{
return reconnectInterval;
}
public void setReconnectInterval(long reconnectInterval)
{
this.reconnectInterval = reconnectInterval;
}
public int getMaxReconnectAttempts()
{
return maxReconnectAttempts;
}
public void setMaxReconnectAttempts(int maxReconnectAttempts)
{
this.maxReconnectAttempts = maxReconnectAttempts;
}
@Override
public void setConnector(IConnector connector)
{
// Do nothing (ignore an externally configured connector)
// Note: we cannot throw UnsupportedOperationException because the
// SessionConfig object will call this.
}
@Override
public void setRepositoryConnectorDescription(String description)
{
if (getRepositoryConnectorDescription() != null)
{
throw new IllegalStateException("Don't call setRepositoryConnectorDescription more than once");
}
super.setRepositoryConnectorDescription(description);
}
@Override
protected void updateConnectorAndRepositoryName()
{
removeTCPConnector();
IConnector newConnector = null;
int failedAttempts = 0;
long startOfLastAttempt = 0;
while (newConnector == null && failedAttempts < maxReconnectAttempts)
{
try
{
if (startOfLastAttempt > 0)
{
delayAsNeeded(startOfLastAttempt);
}
startOfLastAttempt = System.currentTimeMillis();
newConnector = createTCPConnector(getUseHeartBeat());
}
catch (ConnectorException ex)
{
failedAttempts++;
}
}
if (newConnector == null)
{
throw new RuntimeException("Recovery failed"); // TODO (CD) Create custom exception type?
}
super.setConnector(newConnector);
}
private void delayAsNeeded(long startOfLastAttempt)
{
long timeToWait = requiredDelay(startOfLastAttempt);
while (timeToWait > 0)
{
try
{
Thread.sleep(timeToWait);
timeToWait = 0;
}
catch (InterruptedException ex)
{
timeToWait = requiredDelay(startOfLastAttempt);
}
}
}
private long requiredDelay(long startOfLastAttempt)
{
long now = System.currentTimeMillis();
long timeSinceLastAttempt = now - startOfLastAttempt;
long timeToWait = reconnectInterval - timeSinceLastAttempt;
return timeToWait;
}
}
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