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/*
* Copyright (c) 2009-2012 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.session;
import org.eclipse.emf.cdo.session.CDOSession.ExceptionHandler;
import java.text.MessageFormat;
/**
* A {@link ExceptionHandler session exection handler} that retries the failed protocol operation a configurable number
* of times.
*
* @author Eike Stepper
* @since 2.0
*/
public class CDORetryExceptionHandler implements CDOSession.ExceptionHandler
{
public static final int RETRY_FOREVER = -1;
private int retries;
public CDORetryExceptionHandler(int retries)
{
this.retries = retries;
}
public CDORetryExceptionHandler()
{
this(RETRY_FOREVER);
}
public int getRetries()
{
return retries;
}
public boolean isRetryingForever()
{
return retries < 0;
}
/**
* @since 4.0
*/
public void handleException(CDOSession session, int attempt, Exception exception) throws Exception
{
int max = isRetryingForever() ? Integer.MAX_VALUE : retries;
if (attempt > max)
{
throw exception;
}
}
@Override
public String toString()
{
Object arg = isRetryingForever() ? "forever" : retries;
return MessageFormat.format("CDORetryExceptionHandler[retries={0}]", arg); //$NON-NLS-1$
}
}
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