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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.simple;
import com.yahoo.metrics.ManagerConfig;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Common code for running unit tests of simplemetrics
*
* @author ean
*/
public class UnitTestSetup {
MetricManager metricManager;
MetricReceiver receiver;
ObservableUpdater updater;
static class ObservableUpdater extends MetricUpdater {
CountDownLatch gotData = new CountDownLatch(1);
private volatile boolean hasBeenAccessed = false;
@Override
public Bucket createGenerationInstance(Bucket previous) {
if (hasBeenAccessed) {
gotData.countDown();
}
return super.createGenerationInstance(previous);
}
@Override
public Bucket update(Bucket current, Sample x) {
hasBeenAccessed = true;
return super.update(current, x);
}
}
void init() {
updater = new ObservableUpdater();
metricManager = MetricManager.constructWithCustomUpdater(new ManagerConfig(new ManagerConfig.Builder()), updater);
receiver = metricManager.get();
}
void fini() {
receiver = null;
metricManager.deconstruct();
metricManager = null;
updater = null;
}
public Bucket getUpdatedSnapshot() throws InterruptedException {
updater.gotData.await(10, TimeUnit.SECONDS);
Bucket s = receiver.getSnapshot();
long startedWaitingForSnapshot = System.currentTimeMillis();
// just waiting for the correct snapshot being constructed (yes, this is
// necessary)
while (s == null || s.entrySet().size() == 0) {
if (System.currentTimeMillis() - startedWaitingForSnapshot > (10L * 1000L)) {
throw new RuntimeException("Test timed out.");
}
Thread.sleep(10);
s = receiver.getSnapshot();
}
return s;
}
public MetricReceiver getReceiver() {
return receiver;
}
}
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