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HTTP Server component to implement a REST API for the Driver or Evaluators.

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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.reef.webserver;

import org.apache.reef.wake.EventHandler;
import org.apache.reef.wake.time.runtime.event.RuntimeStart;

import javax.inject.Inject;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * RuntimeStartHandler for Http server.
 */
final class HttpRuntimeStartHandler implements EventHandler {
  /**
   * Standard Java logger.
   */
  private static final Logger LOG = Logger.getLogger(HttpRuntimeStartHandler.class.getName());

  /**
   * HttpServer.
   */
  private final HttpServer httpServer;

  /**
   * Constructor of HttpRuntimeStartHandler. It has a reference of HttpServer
   *
   * @param httpServer
   */
  @Inject
  HttpRuntimeStartHandler(final HttpServer httpServer) {
    this.httpServer = httpServer;
  }

  /**
   * Override EventHandler.
   *
   * @param runtimeStart
   */
  @Override
  public synchronized void onNext(final RuntimeStart runtimeStart) {
    LOG.log(Level.FINEST, "HttpRuntimeStartHandler: {0}", runtimeStart);
    try {
      httpServer.start();
      LOG.log(Level.FINEST, "HttpRuntimeStartHandler complete.");
    } catch (final Exception e) {
      LOG.log(Level.SEVERE, "HttpRuntimeStartHandler cannot start the Server. {0}", e);
      throw new RuntimeException("HttpRuntimeStartHandler cannot start the Server.", e);
    }
  }
}