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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 java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import com.yahoo.concurrent.ThreadLocalDirectory;
import com.yahoo.metrics.ManagerConfig;
/**
* Worker thread to collect the data stored in worker threads and build
* snapshots for external consumption. Using the correct executor gives the
* necessary guarantees for this being invoked from only a single thread.
*
* @author Steinar Knutsen
*/
class MetricAggregator implements Runnable {
private final ThreadLocalDirectory<Bucket, Sample> metricsCollection;
private final AtomicReference<Bucket> currentSnapshot;
private int generation = 0;
private final Bucket[] buffer;
private long fromMillis;
private final DimensionCache dimensions;
MetricAggregator(ThreadLocalDirectory<Bucket, Sample> metricsCollection,
AtomicReference<Bucket> currentSnapshot,
ManagerConfig settings) {
if (settings.reportPeriodSeconds() < 10) {
throw new IllegalArgumentException("Do not use this metrics implementation" +
" if report periods of less than 10 seconds is desired.");
}
buffer = new Bucket[settings.reportPeriodSeconds()];
dimensions = new DimensionCache(settings.pointsToKeepPerMetric());
fromMillis = System.currentTimeMillis();
this.metricsCollection = metricsCollection;
this.currentSnapshot = currentSnapshot;
}
@Override
public void run() {
Bucket toDelete = updateBuffer();
createSnapshot(toDelete);
}
private void createSnapshot(Bucket toDelete) {
Bucket toPresent = new Bucket();
for (Bucket b : buffer) {
if (b == null) continue;
toPresent.merge(b);
}
dimensions.updateDimensionPersistence(toDelete, toPresent);
currentSnapshot.set(toPresent);
}
private Bucket updateBuffer() {
List<Bucket> buckets = metricsCollection.fetch();
long toMillis = System.currentTimeMillis();
int bucketIndex = generation++ % buffer.length;
Bucket bucketToDelete = buffer[bucketIndex];
Bucket latest = new Bucket(fromMillis, toMillis);
for (Bucket b : buckets) {
latest.merge(b, true);
}
buffer[bucketIndex] = latest;
this.fromMillis = toMillis;
return bucketToDelete;
}
}
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