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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.metric;
import com.yahoo.container.jdisc.MetricConsumerFactory;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.application.MetricConsumer;
import java.util.Map;
/**
* If more than one {@link MetricConsumerFactory} is registered in a container, calls to <code>Metric</code> need to be
* forwarded to all the underlying <code>MetricConsumers</code>. That is the responsibility of this class.
* Instances of this class is created by the {@link MetricConsumerProvider} in those cases.
*
* @author Simon Thoresen Hult
*/
public final class ForwardingMetricConsumer implements MetricConsumer {
private final MetricConsumer[] consumers;
public ForwardingMetricConsumer(MetricConsumer[] consumers) {
this.consumers = consumers;
}
@Override
public void set(String key, Number val, Metric.Context ctx) {
ForwardingContext fwd = (ForwardingContext)ctx;
for (int i = 0; i < consumers.length; ++i) {
consumers[i].set(key, val, fwd != null ? fwd.contexts[i] : null);
}
}
@Override
public void add(String key, Number val, Metric.Context ctx) {
ForwardingContext fwd = (ForwardingContext)ctx;
for (int i = 0; i < consumers.length; ++i) {
consumers[i].add(key, val, fwd != null ? fwd.contexts[i] : null);
}
}
@Override
public Metric.Context createContext(Map<String, ?> properties) {
Metric.Context[] contexts = new Metric.Context[consumers.length];
for (int i = 0; i < consumers.length; ++i) {
contexts[i] = consumers[i].createContext(properties);
}
return new ForwardingContext(contexts);
}
private static class ForwardingContext implements Metric.Context {
final Metric.Context[] contexts;
ForwardingContext(Metric.Context[] contexts) {
this.contexts = contexts;
}
}
}
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