org.epics.pvmanager.test.ThreadTestingUtil Maven / Gradle / Ivy
/**
* Copyright (C) 2010-12 Brookhaven National Laboratory
* All rights reserved. Use is subject to license terms.
*/
package org.epics.pvmanager.test;
import java.util.concurrent.Callable;
import org.epics.pvmanager.PVReader;
import org.epics.util.time.TimeDuration;
import org.epics.util.time.TimeInterval;
import org.epics.util.time.Timestamp;
/**
*
* @author carcassi
*/
public class ThreadTestingUtil {
/**
* Waits until either the task returns a value or the timeout expires.
* The task is repeated every ms.
*
* @param the return type of the task
* @param task the task
* @param timeout the timeout
* @return the value from the task or null
* @throws Exception an exception from the task
*/
public static T waitFor(Callable task, TimeDuration timeout)
throws Exception {
TimeInterval runInterval = timeout.after(Timestamp.now());
while (runInterval.contains(Timestamp.now())) {
T value = task.call();
if (value != null) {
return value;
}
try {
Thread.sleep(1);
} catch (Exception e) {
Thread.currentThread().interrupt();
}
}
return null;
}
public static TimeDuration waitForValue(PVReader pvReader, TimeDuration timeout) {
TimeInterval runInterval = timeout.after(Timestamp.now());
while (runInterval.contains(Timestamp.now())) {
if (pvReader.getValue() != null) {
return runInterval.getStart().durationBetween(Timestamp.now());
}
try {
Thread.sleep(1);
} catch (Exception e) {
Thread.currentThread().interrupt();
}
}
return null;
}
}