/*
* Copyright (c) 2015 Cisco Systems, Inc. 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
*/
package org.opendaylight.openflowplugin.common.wait;
import java.util.concurrent.Callable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Created by mirehak on 4/28/15.
*/
public class SimpleTaskRetryLooper {
private static final Logger LOG = LoggerFactory.getLogger(SimpleTaskRetryLooper.class);
private final long tick;
private final int maxRetries;
/**
* @param tick sleep between steps in miliseconds
* @param maxRetries retries limit
*/
public SimpleTaskRetryLooper(long tick, int maxRetries) {
this.tick = tick;
this.maxRetries = maxRetries;
}
public <T> T loopUntilNoException(Callable<T> task) throws Exception {
T output = null;
Exception taskException = null;
for (int i = 0; i < maxRetries; i++) {
taskException = null;
try {
output = task.call();
break;
} catch (Exception exception) {
LOG.debug("looper step failed: {}", exception.getMessage());
taskException = exception;
}
try {
Thread.sleep(tick);
} catch (InterruptedException e) {
LOG.debug("interrupted: {}", e.getMessage(), e);
}
}
if (taskException != null) {
throw taskException;
}
LOG.debug("looper step succeeded: {}", output);
return output;
}
}