| /** |
| * 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.heron.scheduler.server; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| import com.sun.net.httpserver.HttpServer; |
| |
| import org.apache.heron.spi.common.Config; |
| import org.apache.heron.spi.scheduler.IScheduler; |
| import org.apache.heron.spi.utils.NetworkUtils; |
| |
| public class SchedulerServer { |
| |
| // initialize the various URL end points |
| private static final String KILL_REQUEST_CONTEXT = "/kill"; |
| private static final String RESTART_REQUEST_CONTEXT = "/restart"; |
| private static final String UPDATE_REQUEST_CONTEXT = "/update"; |
| |
| private static final int SERVER_BACK_LOG = 0; |
| |
| private final HttpServer schedulerServer; |
| private final IScheduler scheduler; |
| private final ExecutorService executorService = Executors.newSingleThreadExecutor(); |
| |
| public SchedulerServer(Config runtime, IScheduler scheduler, int port) |
| throws IOException { |
| |
| this.scheduler = scheduler; |
| this.schedulerServer = createServer(port, executorService); |
| |
| // associate handlers with the URL service end points |
| this.schedulerServer.createContext(KILL_REQUEST_CONTEXT, |
| new ExceptionalRequestHandler(new KillRequestHandler(scheduler), runtime, scheduler)); |
| |
| this.schedulerServer.createContext(RESTART_REQUEST_CONTEXT, |
| new ExceptionalRequestHandler(new RestartRequestHandler(scheduler), runtime, scheduler)); |
| |
| this.schedulerServer.createContext(UPDATE_REQUEST_CONTEXT, |
| new ExceptionalRequestHandler(new UpdateRequestHandler(scheduler), runtime, scheduler)); |
| } |
| |
| public void start() { |
| schedulerServer.start(); |
| } |
| |
| public void stop() { |
| schedulerServer.stop(0); |
| scheduler.close(); |
| |
| // Stopping the server will not shut down the Executor |
| // We have to shut it down explicitly |
| executorService.shutdownNow(); |
| } |
| |
| public String getHost() { |
| return NetworkUtils.getHostName(); |
| } |
| |
| public int getPort() { |
| return schedulerServer.getAddress().getPort(); |
| } |
| |
| protected HttpServer createServer(int port, Executor executor) throws IOException { |
| HttpServer server = HttpServer.create(new InetSocketAddress(port), SERVER_BACK_LOG); |
| server.setExecutor(executor); |
| return server; |
| } |
| } |