| /** |
| * 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.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| import com.sun.net.httpserver.HttpExchange; |
| import com.sun.net.httpserver.HttpHandler; |
| |
| import org.apache.heron.proto.scheduler.Scheduler; |
| import org.apache.heron.scheduler.utils.Runtime; |
| import org.apache.heron.scheduler.utils.SchedulerUtils; |
| import org.apache.heron.spi.common.Config; |
| import org.apache.heron.spi.scheduler.IScheduler; |
| import org.apache.heron.spi.utils.NetworkUtils; |
| |
| /** |
| * {@code HttpHandler} decorator that returns an OK response unless an exception is caught, in |
| * which case a NOTOK response is returned. If the delegate throws a |
| * {@code TerminateSchedulerException}, the scheduler will be terminated after the response is |
| * handled. |
| */ |
| class ExceptionalRequestHandler implements HttpHandler { |
| private static final Logger LOG = Logger.getLogger(ExceptionalRequestHandler.class.getName()); |
| private HttpHandler delegate; |
| private Config runtime; |
| private IScheduler scheduler; |
| |
| ExceptionalRequestHandler(HttpHandler delegate, Config runtime, IScheduler scheduler) { |
| this.delegate = delegate; |
| this.runtime = runtime; |
| this.scheduler = scheduler; |
| } |
| |
| @SuppressWarnings("IllegalCatch") |
| @Override |
| public void handle(HttpExchange exchange) throws IOException { |
| |
| try { |
| delegate.handle(exchange); |
| sendResponse(exchange, true); |
| } catch (TerminateSchedulerException e) { |
| sendResponse(exchange, true); |
| |
| // tell the scheduler to shutdown |
| LOG.info("Request handler issuing a terminate request to scheduler"); |
| try { |
| scheduler.close(); |
| } finally { |
| Runtime.schedulerShutdown(runtime).terminate(); |
| } |
| } catch (Exception e) { |
| handleFailure(exchange, e); |
| } |
| } |
| |
| private static void handleFailure(HttpExchange exchange, Exception e) { |
| LOG.log(Level.SEVERE, |
| String.format("Failed to handle %s request", exchange.getRequestURI()), e); |
| sendResponse(exchange, false); |
| } |
| |
| private static void sendResponse(HttpExchange exchange, boolean success) { |
| Scheduler.SchedulerResponse response = SchedulerUtils.constructSchedulerResponse(success); |
| NetworkUtils.sendHttpResponse(exchange, response.toByteArray()); |
| } |
| } |