server/src/main/java/org/apache/druid/guice/CoordinatorDiscoveryModule.java

/*
 * 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.guice;

import com.google.inject.Binder;
import com.google.inject.Module;
import com.google.inject.Provides;
import org.apache.druid.client.coordinator.Coordinator;
import org.apache.druid.client.coordinator.CoordinatorSelectorConfig;
import org.apache.druid.curator.discovery.ServerDiscoveryFactory;
import org.apache.druid.curator.discovery.ServerDiscoverySelector;
import org.apache.druid.discovery.DruidLeaderClient;
import org.apache.druid.discovery.DruidNodeDiscoveryProvider;
import org.apache.druid.discovery.NodeRole;
import org.apache.druid.guice.annotations.EscalatedGlobal;
import org.apache.druid.java.util.http.client.HttpClient;

/**
 */
public class CoordinatorDiscoveryModule implements Module
{
  @Override
  public void configure(Binder binder)
  {
    JsonConfigProvider.bind(binder, "druid.selectors.coordinator", CoordinatorSelectorConfig.class);
  }

  @Provides
  @Coordinator
  @ManageLifecycle
  public ServerDiscoverySelector getServiceProvider(
      CoordinatorSelectorConfig config,
      ServerDiscoveryFactory serverDiscoveryFactory
  )
  {
    return serverDiscoveryFactory.createSelector(config.getServiceName());
  }

  @Provides
  @Coordinator
  @ManageLifecycle
  public DruidLeaderClient getLeaderHttpClient(
      @EscalatedGlobal HttpClient httpClient,
      DruidNodeDiscoveryProvider druidNodeDiscoveryProvider,
      @Coordinator ServerDiscoverySelector serverDiscoverySelector
  )
  {
    return new DruidLeaderClient(
        httpClient,
        druidNodeDiscoveryProvider,
        NodeRole.COORDINATOR,
        "/druid/coordinator/v1/leader",
        serverDiscoverySelector
    );
  }
}