HystrixMetricsMounter.java

/*
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 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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package io.wcm.caravan.io.http.impl;

import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;

import com.codahale.metrics.MetricRegistry;
import com.netflix.hystrix.contrib.codahalemetricspublisher.HystrixCodaHaleMetricsPublisher;
import com.netflix.hystrix.strategy.HystrixPlugins;

/**
 * Mounter for the Hystrix Metrics plugin.
 */
@Component
public class HystrixMetricsMounter {

  @Reference
  private MetricRegistry metricRegistry;

  @Activate
  protected void activate() {
    HystrixCodaHaleMetricsPublisher publisher = new HystrixCodaHaleMetricsPublisher(metricRegistry);
    HystrixPlugins.getInstance().registerMetricsPublisher(publisher);
  }

  @Deactivate
  protected void deactivate() {
    metricRegistry.getNames().stream().forEach(name -> metricRegistry.remove(name));
    HystrixPlugins.reset();
  }

}