/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.nephele.instance.cluster;
import eu.stratosphere.nephele.instance.InstanceListener;
import eu.stratosphere.nephele.jobgraph.JobID;
/**
* This class contains utility methods used during the tests of the {@link ClusterManager} implementation.
*
*/
public class ClusterManagerTestUtils {
/**
* Granularity of the sleep time.
*/
private static final long SLEEP_TIME = 10; // 10 milliseconds
/**
* Private constructor so the class cannot be instantiated.
*/
private ClusterManagerTestUtils() {
}
/**
* Waits until a specific number of instances have registered or deregistrations with the given
* {@link InstanceListener} object for a given job or the maximum wait time has elapsed.
*
* @param jobID
* the ID of the job to check the instance registration for
* @param instanceListener
* the listener which shall be notified when a requested instance is available for the job
* @param numberOfInstances
* the number of registered instances to wait for
* @param maxWaitTime
* the maximum wait time before this method returns
*/
public static void waitForInstances(JobID jobID, TestInstanceListener instanceListener,
int numberOfInstances, long maxWaitTime) {
final long startTime = System.currentTimeMillis();
while (instanceListener.getNumberOfAllocatedResourcesForJob(jobID) != numberOfInstances) {
try {
Thread.sleep(SLEEP_TIME);
} catch (InterruptedException e) {
break;
}
if ((System.currentTimeMillis() - startTime) >= maxWaitTime) {
break;
}
}
}
}