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Metrics integration.

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/*
 * #%L
 * 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.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package io.wcm.caravan.commons.metrics.impl;

import java.util.Hashtable;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.health.HealthCheckRegistry;

/**
 * Registers metric and health check registry.
 */
public class BundleActivator implements org.osgi.framework.BundleActivator {

  private ServiceRegistration metricRegistry;
  private ServiceRegistration healthRegistry;

  @Override
  public void start(final BundleContext context) throws Exception {
    metricRegistry = context.registerService(MetricRegistry.class, new MetricRegistry(), new Hashtable());
    healthRegistry = context.registerService(HealthCheckRegistry.class, new HealthCheckRegistry(), new Hashtable());
  }

  @Override
  public void stop(final BundleContext context) throws Exception {
    context.ungetService(metricRegistry.getReference());
    context.ungetService(healthRegistry.getReference());
  }

}