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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.simple.jdisc;
import java.io.PrintStream;
import java.util.logging.Logger;
import com.yahoo.container.jdisc.MetricConsumerFactory;
import com.yahoo.container.jdisc.state.MetricSnapshot;
import com.yahoo.container.jdisc.state.SnapshotProvider;
import com.yahoo.jdisc.application.MetricConsumer;
import com.yahoo.metrics.simple.Bucket;
import com.yahoo.metrics.simple.MetricReceiver;
/**
* A factory for all the JDisc API classes.
*
* @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
*/
public class JdiscMetricsFactory implements MetricConsumerFactory, SnapshotProvider {
private static final Logger log = Logger.getLogger(JdiscMetricsFactory.class.getName());
private final SimpleMetricConsumer metricInstance;
private final MetricReceiver metricReceiver;
public JdiscMetricsFactory(MetricReceiver receiver) {
this.metricReceiver = receiver;
this.metricInstance = new SimpleMetricConsumer(receiver);
}
@Override
public MetricConsumer newInstance() {
// the underlying implementation is thread safe anyway to allow for stand-alone use
return metricInstance;
}
@Override
public MetricSnapshot latestSnapshot() {
Bucket curr = metricReceiver.getSnapshot();
if (curr == null) {
log.warning("no snapshot from instance of " + metricReceiver.getClass());
return null;
} else {
SnapshotConverter converter = new SnapshotConverter(curr);
return converter.convert();
}
}
@Override
public void histogram(PrintStream output) {
Bucket curr = metricReceiver.getSnapshot();
if (curr == null) {
log.warning("no snapshot from instance of " + metricReceiver.getClass());
} else {
SnapshotConverter converter = new SnapshotConverter(curr);
converter.outputHistograms(output);
}
}
}
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