/
RetryingInvoker.java
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/
RetryingInvoker.java
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/*
* 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.retry;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
import org.jboss.logging.Logger;
import org.wildfly.clustering.ee.Invoker;
import org.wildfly.common.function.ExceptionRunnable;
import org.wildfly.common.function.ExceptionSupplier;
/**
* 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 List<Duration> retryIntevals;
public RetryingInvoker(Duration... retryIntervals) {
this(Arrays.asList(retryIntervals));
}
protected RetryingInvoker(List<Duration> retryIntevals) {
this.retryIntevals = retryIntevals;
}
@Override
public <R, E extends Exception> R invoke(ExceptionSupplier<R, E> task) throws E {
int attempt = 0;
for (Duration delay : this.retryIntevals) {
if (Thread.currentThread().isInterrupted()) break;
try {
return task.get();
} catch (Exception e) {
LOGGER.debugf(e, "Attempt #%d failed", ++attempt);
}
if (delay.isZero() || delay.isNegative()) {
Thread.yield();
} else {
try {
Thread.sleep(delay.toMillis(), delay.getNano() % 1_000_000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
return task.get();
}
@Override
public <E extends Exception> void invoke(ExceptionRunnable<E> action) throws E {
ExceptionSupplier<Void, E> adapter = new ExceptionSupplier<Void, E>() {
@Override
public Void get() throws E {
action.run();
return null;
}
};
this.invoke(adapter);
}
}