/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.testsuite;
import java.util.function.Supplier;
/**
* @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
*/
public class Retry {
/**
* Runs the given {@code runnable} at most {@code retryCount} times until it passes,
* leaving {@code intervalMillis} milliseconds between the invocations.
* The runnable is reexecuted if it throws a {@link RuntimeException} or {@link AssertionError}.
* @param runnable
* @param attemptsCount Total number of attempts to execute the {@code runnable}
* @param intervalMillis
* @return Index of the first successful invocation, starting from 0.
*/
public static int execute(Runnable runnable, int attemptsCount, long intervalMillis) {
int executionIndex = 0;
while (true) {
try {
runnable.run();
return executionIndex;
} catch (RuntimeException | AssertionError e) {
attemptsCount--;
executionIndex++;
if (attemptsCount > 0) {
try {
Thread.sleep(intervalMillis);
} catch (InterruptedException ie) {
ie.addSuppressed(e);
throw new RuntimeException(ie);
}
} else {
throw e;
}
}
}
}
/**
* Runs the given {@code runnable} at most {@code retryCount} times until it passes,
* leaving {@code intervalMillis} milliseconds between the invocations.
* The runnable is reexecuted if it throws a {@link RuntimeException} or {@link AssertionError}.
* @param supplier
* @param attemptsCount Total number of attempts to execute the {@code runnable}
* @param intervalMillis
* @return Value generated by the {@code supplier}.
*/
public static <T> T call(Supplier<T> supplier, int attemptsCount, long intervalMillis) {
while (true) {
try {
return supplier.get();
} catch (RuntimeException | AssertionError e) {
attemptsCount--;
if (attemptsCount > 0) {
try {
Thread.sleep(intervalMillis);
} catch (InterruptedException ie) {
ie.addSuppressed(e);
throw new RuntimeException(ie);
}
} else {
throw e;
}
}
}
}
}