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druid-services

There is a newer version: 0.12.3

/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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.
 */

package io.druid.cli;

import com.google.common.base.Throwables;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Module;
import com.metamx.common.lifecycle.Lifecycle;
import com.metamx.common.logger.Logger;
import io.druid.initialization.Initialization;
import io.druid.initialization.LogLevelAdjuster;

import java.util.List;

/**
 */
public abstract class GuiceRunnable implements Runnable
{
  private final Logger log;

  private Injector baseInjector;

  public GuiceRunnable(Logger log)
  {
    this.log = log;
  }

  @Inject
  public void configure(Injector injector)
  {
    this.baseInjector = injector;
  }

  protected abstract List getModules();

  public Injector makeInjector()
  {
    try {
      return Initialization.makeInjectorWithModules(
          baseInjector, getModules()
      );
    }
    catch (Exception e) {
      throw Throwables.propagate(e);
    }
  }

  public Lifecycle initLifecycle(Injector injector)
  {
    try {
      LogLevelAdjuster.register();
      final Lifecycle lifecycle = injector.getInstance(Lifecycle.class);

      try {
        lifecycle.start();
      }
      catch (Throwable t) {
        log.error(t, "Error when starting up.  Failing.");
        System.exit(1);
      }

      return lifecycle;
    }
    catch (Exception e) {
      throw Throwables.propagate(e);
    }
  }
}