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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.jdisc.application;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.yahoo.jdisc.Metric;
import java.util.Map;
/**
* @author Simon Thoresen Hult
*/
class MetricImpl implements Metric {
private final LocalConsumer consumer;
@Inject
public MetricImpl(Provider<MetricConsumer> provider) {
consumer = new LocalConsumer(provider);
}
@Override
public void set(String key, Number val, Context ctx) {
MetricConsumer consumer = currentConsumer();
if (consumer != null) {
consumer.set(key, val, ctx);
}
}
@Override
public void add(String key, Number val, Context ctx) {
MetricConsumer consumer = currentConsumer();
if (consumer != null) {
consumer.add(key, val, ctx);
}
}
@Override
public Context createContext(Map<String, ?> keys) {
MetricConsumer consumer = currentConsumer();
if (consumer == null) {
return null;
}
return consumer.createContext(keys);
}
private MetricConsumer currentConsumer() {
return Thread.currentThread() instanceof ContainerThread thread ? thread.consumer() : consumer.get();
}
private static class LocalConsumer extends ThreadLocal<MetricConsumer> {
final Provider<MetricConsumer> factory;
LocalConsumer(Provider<MetricConsumer> factory) {
this.factory = factory;
}
@Override
protected MetricConsumer initialValue() {
return factory.get();
}
}
}
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