/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.wildfly.clustering.ee.infinispan;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import org.jboss.logging.Logger;
import org.wildfly.clustering.ee.Invoker;
/**
* A invocation strategy that invokes a given task, retrying a configurable number of times on failure using backoff sleep intervals.
* @author Paul Ferraro
*/
public class RetryingInvoker implements Invoker {
// No logger interface for this module and no reason to create one for this class only
private static final Logger LOGGER = Logger.getLogger(RetryingInvoker.class);
private final long[] backOffIntervals;
private final TimeUnit unit;
public RetryingInvoker(long... backOffIntervals) {
this(backOffIntervals, TimeUnit.MILLISECONDS);
}
public RetryingInvoker(long[] backOffIntervals, TimeUnit unit) {
this.backOffIntervals = backOffIntervals;
this.unit = unit;
}
@Override
public <R> R invoke(Callable<R> task) throws Exception {
Exception exception = null;
for (int i = 0; i < this.backOffIntervals.length; ++i) {
if (i > 0) {
long delay = this.backOffIntervals[i];
if (delay > 0) {
try {
this.unit.sleep(delay);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
} else {
Thread.yield();
}
if (Thread.currentThread().isInterrupted()) break;
}
try {
return task.call();
} catch (Exception e) {
exception = e;
}
LOGGER.debugf(exception, "Attempt #%d failed", i + 1);
}
throw exception;
}
}