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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.container.jdisc.metric;
import com.google.inject.Inject;
import com.yahoo.component.provider.ComponentRegistry;
import com.yahoo.container.jdisc.MetricConsumerFactory;
import com.yahoo.container.jdisc.metric.state.StateMetricConsumerFactory;
import com.yahoo.container.jdisc.state.StateMonitor;
import com.yahoo.jdisc.application.MetricConsumer;
import com.yahoo.metrics.MetricsPresentationConfig;
/**
* <p>The purpose of this class it to be the only provider for the <tt>MetricConsumer</tt> interface in a component
* graph. This component is automatically registered in the graph by the config server. Configuring a different
* <tt>MetricConsumer</tt> is done by registering one or more {@link MetricConsumerFactory} in the services-file.</p>
*
* <p>Because this class depends on the {@link ComponentRegistry} of {@link MetricConsumerFactory}, any added or removed
* {@link MetricConsumerFactory} will cause this component to be reconfigured. Because {@link MetricProvider} depends on
* this class, which means any component that uses <tt>Metric</tt> will be reconfigured. Any component that depends
* directly on <tt>MetricConsumer</tt> will also be reconfigured.</p>
*
* @author Simon Thoresen Hult
*/
public class MetricConsumerProvider {
private final MetricConsumerFactory[] factories;
@Inject
public MetricConsumerProvider(ComponentRegistry<MetricConsumerFactory> factoryRegistry,
MetricsPresentationConfig presentationConfig,
StateMonitor stateMonitor) {
MetricConsumerFactory[] factories;
if (factoryRegistry.getComponentCount() == 0 || ! presentationConfig.slidingwindow()) {
factories = new MetricConsumerFactory[1];
factories[0] = new StateMetricConsumerFactory(stateMonitor);
} else {
factories = new MetricConsumerFactory[factoryRegistry.getComponentCount()];
factoryRegistry.allComponents().toArray(factories);
}
this.factories = factories;
}
public MetricConsumer newInstance() {
if (factories.length == 1) {
return factories[0].newInstance();
}
MetricConsumer[] consumers = new MetricConsumer[factories.length];
for (int i = 0; i < factories.length; ++i) {
consumers[i] = factories[i].newInstance();
}
return new ForwardingMetricConsumer(consumers);
}
}
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