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/**
* ********************************************************************
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICES file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ********************************************************************
*
*/
package org.eclipse.microprofile.metrics.tck.util;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class ControlledInvocation {
private final BeanWithControlledInvocation bean;
// used to mark when the invocation has already started so the concurrent gauge was incremented
// the bean itself should call countDown
private final CountDownLatch startMarker;
// used to instruct the invocation to finish
// the invocation task calls countDown
private final CountDownLatch endMarker;
// used to mark when the invocation has already finished so the concurrent gauge was decremented
private final CountDownLatch endCommand;
public ControlledInvocation(BeanWithControlledInvocation bean) {
this.bean = bean;
this.startMarker = new CountDownLatch(1);
this.endCommand = new CountDownLatch(1);
this.endMarker = new CountDownLatch(1);
}
/**
* Start the invocation and synchronously wait until we are sure that the relevant metrics were updated.
*/
public void start() throws InterruptedException, TimeoutException {
new Thread(
() -> {
bean.controlledMethod(startMarker, endCommand);
endMarker.countDown();
}).start();
if (!startMarker.await(5, TimeUnit.SECONDS)) {
throw new TimeoutException();
}
}
/**
* Stop the invocation and synchronously wait until we are sure that the relevant metrics were updated.
*/
public void stop() {
try {
// do nothing if stop was already called before
// do nothing if start was never called
if (endCommand.getCount() != 0 && startMarker.getCount() == 0) {
endCommand.countDown();
if (!endMarker.await(5, TimeUnit.SECONDS)) {
throw new TimeoutException();
}
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
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