/*
 * 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.ambari.funtest.server;

import com.google.inject.Inject;
import org.apache.ambari.server.controller.AmbariServer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.google.inject.Injector;

/**
* Wrap AmbariServer as a testable unit.
*/
public class LocalAmbariServer implements Runnable {

  private static Log LOG = LogFactory.getLog(AmbariServer.class);

  /**
   * Actual ambari server instance.
   */
  private AmbariServer ambariServer = null;

  @Inject
  private Injector injector;

  public LocalAmbariServer() {}

  /**
   * Thread entry point.
   */
  @Override
  public void run(){
    try {
      startServer();
    }
    catch (Exception ex) {
      LOG.info("Exception received ", ex);
      throw new RuntimeException(ex);
    }
  }

  /**
   * Configures the Guice injector to use the in-memory test DB
   * and attempts to start an instance of AmbariServer.
   *
   * @throws Exception
   */
  private void startServer() throws Exception {
    try {
      LOG.info("Attempting to start ambari server...");

      AmbariServer.setupProxyAuth();
      ambariServer = injector.getInstance(AmbariServer.class);
      ambariServer.initViewRegistry();
      ambariServer.run();
    } catch (InterruptedException ex) {
      LOG.info(ex);
    } catch (Throwable t) {
      LOG.error("Failed to run the Ambari Server", t);
      stopServer();
      throw t;
    }
  }

  /**
   * Attempts to stop the test AmbariServer instance.
   * @throws Exception
   */
  public void stopServer() throws Exception {
    LOG.info("Stopping ambari server...");

    if (ambariServer != null) {
      ambariServer.stop();
    }
  }
}