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Druid emitter extension to support ambari metrics server

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.druid.emitter.ambari.metrics;

import com.fasterxml.jackson.databind.Module;
import com.google.inject.Binder;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provides;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import org.apache.druid.guice.JsonConfigProvider;
import org.apache.druid.guice.ManageLifecycle;
import org.apache.druid.initialization.DruidModule;
import org.apache.druid.java.util.emitter.core.Emitter;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

public class AmbariMetricsEmitterModule implements DruidModule
{
  private static final String EMITTER_TYPE = "ambari-metrics";

  @Override
  public List getJacksonModules()
  {
    return Collections.emptyList();
  }

  @Override
  public void configure(Binder binder)
  {
    JsonConfigProvider.bind(binder, "druid.emitter." + EMITTER_TYPE, AmbariMetricsEmitterConfig.class);
  }

  @Provides
  @ManageLifecycle
  @Named(EMITTER_TYPE)
  public Emitter getEmitter(AmbariMetricsEmitterConfig emitterConfig, final Injector injector)
  {
    List emitters = emitterConfig
        .getAlertEmitters()
        .stream()
        .map((String name) -> injector.getInstance(Key.get(Emitter.class, Names.named(name))))
        .collect(Collectors.toList());
    return new AmbariMetricsEmitter(emitterConfig, emitters);
  }
}