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89 changes: 89 additions & 0 deletions
89
...src/main/java/rocks/inspectit/oce/eum/server/metrics/percentiles/AsyncMetricRecorder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package rocks.inspectit.oce.eum.server.metrics.percentiles; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import io.opencensus.common.Timestamp; | ||
| import io.opencensus.tags.TagContext; | ||
| import lombok.Value; | ||
| import lombok.extern.slf4j.Slf4j; | ||
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| import java.util.concurrent.ArrayBlockingQueue; | ||
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| /** | ||
| * COPIED FROM THE OCELOT CORE PROJECT! | ||
| * <p> | ||
| * Consumer thread for asynchronously processing measurement observations. | ||
| */ | ||
| @Slf4j | ||
| class AsyncMetricRecorder { | ||
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| private static final int QUEUE_CAPACITY = 8096; | ||
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| private final MetricConsumer metricConsumer; | ||
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| private volatile boolean overflowLogged = false; | ||
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| private volatile boolean isDestroyed = false; | ||
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| @VisibleForTesting | ||
| final ArrayBlockingQueue<MetricRecord> recordsQueue = new ArrayBlockingQueue<>(QUEUE_CAPACITY); | ||
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| @VisibleForTesting | ||
| final Thread worker; | ||
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| AsyncMetricRecorder(MetricConsumer consumer) { | ||
| metricConsumer = consumer; | ||
| worker = new Thread(this::doRecord); | ||
| worker.setDaemon(true); | ||
| worker.setName("InspectIT Ocelot percentile Recorder"); | ||
| worker.start(); | ||
| } | ||
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| void record(String measureName, double value, Timestamp time, TagContext tags) { | ||
| boolean success = recordsQueue.offer(new MetricRecord(value, measureName, time, tags)); | ||
| if (!success && !overflowLogged) { | ||
| overflowLogged = true; | ||
| log.warn("Measurement for percentiles has been dropped because queue is full. This message will not be shown for further drops!"); | ||
| } | ||
| } | ||
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| void destroy() { | ||
| isDestroyed = true; | ||
| worker.interrupt(); | ||
| } | ||
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| private void doRecord() { | ||
| while (true) { | ||
| try { | ||
| MetricRecord record = recordsQueue.take(); | ||
| metricConsumer.record(record.measure, record.value, record.time, record.tagContext); | ||
| } catch (InterruptedException e) { | ||
| if (isDestroyed) { | ||
| return; | ||
| } else { | ||
| log.error("Unexpected interrupt", e); | ||
| } | ||
| } catch (Exception e) { | ||
| log.error("Error processing record: ", e); | ||
| } | ||
| } | ||
| } | ||
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| public interface MetricConsumer { | ||
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| void record(String measure, double value, Timestamp time, TagContext tags); | ||
| } | ||
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| @Value | ||
| private static class MetricRecord { | ||
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| double value; | ||
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| String measure; | ||
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| Timestamp time; | ||
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| TagContext tagContext; | ||
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| } | ||
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| } |
54 changes: 54 additions & 0 deletions
54
...c/main/java/rocks/inspectit/oce/eum/server/metrics/percentiles/CachingMetricProducer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package rocks.inspectit.oce.eum.server.metrics.percentiles; | ||
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| import io.opencensus.metrics.export.Metric; | ||
| import io.opencensus.metrics.export.MetricProducer; | ||
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| import java.time.Duration; | ||
| import java.util.Collection; | ||
| import java.util.function.Supplier; | ||
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| /** | ||
| * COPIED FROM THE OCELOT CORE PROJECT! | ||
| * <p> | ||
| * A metric producer which caches the metrics for a specified amount of time. | ||
| */ | ||
| public class CachingMetricProducer extends MetricProducer { | ||
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| /** | ||
| * The function invoked to generate the metrics. | ||
| */ | ||
| private final Supplier<Collection<Metric>> computeMetricsFunction; | ||
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| /** | ||
| * The duration for which cached metrics are kept. | ||
| */ | ||
| private final long cacheDurationNanos; | ||
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| /** | ||
| * The timestamp when the metrics were computed the last time. | ||
| */ | ||
| private long cacheTimestamp; | ||
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| private Collection<Metric> cachedMetrics = null; | ||
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| /** | ||
| * Constructor. | ||
| * | ||
| * @param computeMetricsFunction the function to invoke for computing the metrics | ||
| * @param cacheDuration the duration for which the values shall be cached. | ||
| */ | ||
| public CachingMetricProducer(Supplier<Collection<Metric>> computeMetricsFunction, Duration cacheDuration) { | ||
| this.computeMetricsFunction = computeMetricsFunction; | ||
| cacheDurationNanos = cacheDuration.toNanos(); | ||
| } | ||
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| @Override | ||
| public synchronized Collection<Metric> getMetrics() { | ||
| long now = System.nanoTime(); | ||
| if (cachedMetrics == null || (now - cacheTimestamp) > cacheDurationNanos) { | ||
| cachedMetrics = computeMetricsFunction.get(); | ||
| cacheTimestamp = now; | ||
| } | ||
| return cachedMetrics; | ||
| } | ||
| } |
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