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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.jdisc.application;
import com.google.inject.ProvidedBy;
import com.google.inject.Provider;
import com.yahoo.jdisc.Metric;
import java.util.Map;
/**
* <p>This interface defines the consumer counterpart of the {@link Metric} interface. All Metric objects contain their
* own thread local instance of this interface, so most implementations will require a registry of sorts to manage the
* aggregation of state across MetricConsumers.</p>
*
* <p>An {@link Application} needs to bind a {@link Provider} of this interface to an implementation, or else all calls
* to the Metric objects become no-ops. An implementation will look similar to:</p>
*
* <pre>
* private final MyMetricRegistry myMetricRegistry = new MyMetricRegistry();
* void createContainer() {
* ContainerBuilder builder = containerActivator.newContainerBuilder();
* builder.guice().install(new MyGuiceModule());
* (...)
* }
* class MyGuiceModule extends com.google.inject.AbstractModule {
* void configure() {
* bind(MetricConsumer.class).toProvider(myMetricRegistry);
* (...)
* }
* }
* class MyMetricRegistry implements com.google.inject.Provider<MetricConsumer> {
* (...)
* }
* </pre>
*
* @author Simon Thoresen Hult
*/
@ProvidedBy(MetricNullProvider.class)
public interface MetricConsumer {
/**
* Consume a call to <code>Metric.set(String, Number, Metric.Context)</code>.
*
* @param key the name of the metric to modify
* @param val the value to assign to the named metric
* @param ctx the context to further describe this entry
*/
void set(String key, Number val, Metric.Context ctx);
/**
* Consume a call to <code>Metric.add(String, Number, Metric.Context)</code>.
*
* @param key the name of the metric to modify
* @param val the value to add to the named metric
* @param ctx the context to further describe this entry
*/
void add(String key, Number val, Metric.Context ctx);
/**
* Creates a <code>Metric.Context</code> object that encapsulates the given properties. The returned Context object
* will be passed along every future call to <code>set(String, Number, Metric.Context)</code> and
* <code>add(String, Number, Metric.Context)</code> where the properties match those given here.
*
* @param properties the properties to incorporate in the context
* @return the created context
*/
Metric.Context createContext(Map<String, ?> properties);
}
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