/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.sling.ide.test.impl.helpers;
import static org.junit.Assert.assertThat;
import java.util.concurrent.Callable;
import org.hamcrest.Matcher;
import junit.framework.AssertionFailedError;
public class Poller {
private static final long DEFAULT_POLL_WAIT_MILLIS = 5000;
private static final long DEFAULT_DELAY_MILLIS = 100;
public void pollUntilSuccessful(Runnable r) throws InterruptedException {
long cutoff = System.currentTimeMillis() + DEFAULT_POLL_WAIT_MILLIS;
Throwable lastError = null;
while (true) {
try {
r.run();
break;
} catch (RuntimeException e) {
lastError = e;
// skip
} catch (AssertionFailedError e) {
lastError = e;
// skip
} catch (AssertionError e) {
lastError = e;
// skip
}
if (System.currentTimeMillis() >= cutoff) {
if (lastError instanceof RuntimeException) {
throw (RuntimeException) lastError;
} else if (lastError instanceof Error) {
throw (Error) lastError;
}
throw new AssertionFailedError("Runnable " + r + " did not succeed in the allocated "
+ DEFAULT_POLL_WAIT_MILLIS + " ms");
}
Thread.sleep(DEFAULT_DELAY_MILLIS);
}
}
public <V> V pollUntil(final Callable<V> callable, final Matcher<V> matcher) throws InterruptedException {
final Object[] holder = new Object[1];
pollUntilSuccessful(new Runnable() {
@Override
public void run() {
V result;
try {
result = callable.call();
holder[0] = result;
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
}
assertThat(result, matcher);
}
@Override
public String toString() {
return callable.toString();
}
});
// safe, since only we write in holder[0]
return (V) holder[0];
}
}