| /* |
| * 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.tang.annotations.Parameter; |
| import org.mortbay.jetty.HttpConnection; |
| import org.mortbay.jetty.Request; |
| import org.mortbay.jetty.handler.AbstractHandler; |
| |
| import javax.inject.Inject; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Jetty Event Handler. |
| */ |
| class JettyHandler extends AbstractHandler { |
| private static final Logger LOG = Logger.getLogger(JettyHandler.class.getName()); |
| /** |
| * a map that contains eventHandler's specification and the reference. |
| */ |
| private final Map<String, HttpHandler> eventHandlers = new HashMap<>(); |
| |
| /** |
| * Jetty Event Handler. It accepts a set of IHttpHandlers |
| * |
| * @param httpEventHandlers |
| */ |
| @Inject |
| JettyHandler(@Parameter(HttpEventHandlers.class) final Set<HttpHandler> httpEventHandlers) { |
| for (final HttpHandler handler : httpEventHandlers) { |
| if (!eventHandlers.containsKey(handler.getUriSpecification())) { |
| eventHandlers.put(handler.getUriSpecification().toLowerCase(), handler); |
| } else { |
| LOG.log(Level.WARNING, "The http event handler for {0} is already registered.", handler.getUriSpecification()); |
| } |
| } |
| } |
| |
| /** |
| * handle http request. |
| * |
| * @param target |
| * @param request |
| * @param response |
| * @param i |
| * @throws IOException |
| * @throws ServletException |
| */ |
| @Override |
| public void handle( |
| final String target, |
| final HttpServletRequest request, |
| final HttpServletResponse response, |
| final int i) |
| throws IOException, ServletException { |
| LOG.log(Level.INFO, "JettyHandler handle is entered with target: {0} ", target); |
| |
| final Request baseRequest = (request instanceof Request) ? (Request) request : |
| HttpConnection.getCurrentConnection().getRequest(); |
| |
| response.setContentType("text/html;charset=utf-8"); |
| |
| final ParsedHttpRequest parsedHttpRequest = new ParsedHttpRequest(request); |
| final HttpHandler handler = validate(request, response, parsedHttpRequest); |
| if (handler != null) { |
| LOG.log(Level.INFO, "calling HttpHandler.onHttpRequest from JettyHandler.handle() for {0}.", |
| handler.getUriSpecification()); |
| handler.onHttpRequest(parsedHttpRequest, response); |
| response.setStatus(HttpServletResponse.SC_OK); |
| } |
| |
| baseRequest.setHandled(true); |
| LOG.log(Level.INFO, "JettyHandler handle exists"); |
| } |
| |
| /** |
| * Validate request and get http handler for the request. |
| * |
| * @param request |
| * @param response |
| * @return |
| * @throws IOException |
| * @throws ServletException |
| */ |
| private HttpHandler validate(final HttpServletRequest request, |
| final HttpServletResponse response, |
| final ParsedHttpRequest parsedHttpRequest) throws IOException, ServletException { |
| final String specification = parsedHttpRequest.getTargetSpecification(); |
| final String version = parsedHttpRequest.getVersion(); |
| |
| if (specification == null) { |
| writeMessage(response, "Specification is not provided in the request.", HttpServletResponse.SC_BAD_REQUEST); |
| return null; |
| } |
| |
| final HttpHandler handler = eventHandlers.get(specification.toLowerCase()); |
| if (handler == null) { |
| writeMessage(response, String.format("No event handler registered for: [%s].", specification), |
| HttpServletResponse.SC_NOT_FOUND); |
| return null; |
| } |
| |
| if (version == null) { |
| writeMessage(response, "Version is not provided in the request.", HttpServletResponse.SC_BAD_REQUEST); |
| return null; |
| } |
| return handler; |
| } |
| |
| /** |
| * process write message and status on the response. |
| * |
| * @param response |
| * @param message |
| * @param status |
| * @throws IOException |
| */ |
| private void writeMessage(final HttpServletResponse response, final String message, final int status) |
| throws IOException { |
| response.getWriter().println(message); |
| response.setStatus(status); |
| } |
| |
| /** |
| * Add a handler explicitly instead of through injection. This is for handlers created on the fly. |
| * |
| * @param handler |
| */ |
| final void addHandler(final HttpHandler handler) { |
| if (handler != null) { |
| if (!eventHandlers.containsKey(handler.getUriSpecification().toLowerCase())) { |
| eventHandlers.put(handler.getUriSpecification().toLowerCase(), handler); |
| } else { |
| LOG.log(Level.WARNING, "JettyHandler handle is already registered: {0} ", handler.getUriSpecification()); |
| } |
| } |
| } |
| } |