257 lines
9.4 KiB
Java
257 lines
9.4 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package chat;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.PrintWriter;
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import java.util.ArrayList;
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import org.apache.catalina.CometEvent;
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import org.apache.catalina.CometProcessor;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* Helper class to implement Comet functionality.
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*/
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public class ChatServlet
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extends HttpServlet implements CometProcessor {
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protected ArrayList<HttpServletResponse> connections =
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new ArrayList<HttpServletResponse>();
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protected MessageSender messageSender = null;
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public void init() throws ServletException {
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messageSender = new MessageSender();
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Thread messageSenderThread =
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new Thread(messageSender, "MessageSender[" + getServletContext().getContextPath() + "]");
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messageSenderThread.setDaemon(true);
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messageSenderThread.start();
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}
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public void destroy() {
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connections.clear();
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messageSender.stop();
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messageSender = null;
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}
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/**
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* Process the given Comet event.
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*
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* @param event The Comet event that will be processed
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* @throws IOException
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* @throws ServletException
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*/
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public void event(CometEvent event)
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throws IOException, ServletException {
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// Note: There should really be two servlets in this example, to avoid
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// mixing Comet stuff with regular connection processing
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HttpServletRequest request = event.getHttpServletRequest();
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HttpServletResponse response = event.getHttpServletResponse();
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if (event.getEventType() == CometEvent.EventType.BEGIN) {
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String action = request.getParameter("action");
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if (action != null) {
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if ("login".equals(action)) {
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String nickname = request.getParameter("nickname");
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request.getSession(true).setAttribute("nickname", nickname);
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response.sendRedirect("post.jsp");
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event.close();
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return;
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} else {
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String nickname = (String) request.getSession(true).getAttribute("nickname");
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String message = request.getParameter("message");
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messageSender.send(nickname, message);
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response.sendRedirect("post.jsp");
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event.close();
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return;
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}
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} else {
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if (request.getSession(true).getAttribute("nickname") == null) {
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// Redirect to "login"
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log("Redirect to login for session: " + request.getSession(true).getId());
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response.sendRedirect("login.jsp");
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event.close();
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return;
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}
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}
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begin(event, request, response);
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} else if (event.getEventType() == CometEvent.EventType.ERROR) {
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error(event, request, response);
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} else if (event.getEventType() == CometEvent.EventType.END) {
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end(event, request, response);
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} else if (event.getEventType() == CometEvent.EventType.READ) {
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read(event, request, response);
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}
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}
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protected void begin(CometEvent event, HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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log("Begin for session: " + request.getSession(true).getId());
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PrintWriter writer = response.getWriter();
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writer.println("<!doctype html public \"-//w3c//dtd html 4.0 transitional//en\">");
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writer.println("<html><head><title>JSP Chat</title></head><body bgcolor=\"#FFFFFF\">");
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writer.flush();
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synchronized(connections) {
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connections.add(response);
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}
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}
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protected void end(CometEvent event, HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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log("End for session: " + request.getSession(true).getId());
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synchronized(connections) {
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connections.remove(response);
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}
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PrintWriter writer = response.getWriter();
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writer.println("</body></html>");
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event.close();
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}
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protected void error(CometEvent event, HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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log("Error for session: " + request.getSession(true).getId());
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synchronized(connections) {
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connections.remove(response);
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}
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event.close();
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}
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protected void read(CometEvent event, HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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InputStream is = request.getInputStream();
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byte[] buf = new byte[512];
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while (is.available() > 0) {
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log("Available: " + is.available());
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int n = is.read(buf);
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if (n > 0) {
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log("Read " + n + " bytes: " + new String(buf, 0, n)
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+ " for session: " + request.getSession(true).getId());
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} else if (n < 0) {
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log("End of file: " + n);
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end(event, request, response);
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return;
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}
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}
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}
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protected void service(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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// Compatibility method: equivalent method using the regular connection model
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PrintWriter writer = response.getWriter();
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writer.println("<!doctype html public \"-//w3c//dtd html 4.0 transitional//en\">");
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writer.println("<html><head><title>JSP Chat</title></head><body bgcolor=\"#FFFFFF\">");
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writer.println("Chat example only supports Comet processing");
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writer.println("</body></html>");
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}
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/**
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* Poller class.
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*/
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public class MessageSender implements Runnable {
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protected boolean running = true;
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protected ArrayList<String> messages = new ArrayList<String>();
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public MessageSender() {
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}
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public void stop() {
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running = false;
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}
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/**
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* Add specified socket and associated pool to the poller. The socket will
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* be added to a temporary array, and polled first after a maximum amount
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* of time equal to pollTime (in most cases, latency will be much lower,
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* however).
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*
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* @param socket to add to the poller
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*/
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public void send(String user, String message) {
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synchronized (messages) {
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messages.add("[" + user + "]: " + message);
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messages.notify();
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}
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}
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/**
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* The background thread that listens for incoming TCP/IP connections and
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* hands them off to an appropriate processor.
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*/
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public void run() {
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// Loop until we receive a shutdown command
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while (running) {
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// Loop if endpoint is paused
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if (messages.size() == 0) {
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try {
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synchronized (messages) {
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messages.wait();
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}
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} catch (InterruptedException e) {
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// Ignore
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}
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}
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synchronized (connections) {
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String[] pendingMessages = null;
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synchronized (messages) {
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pendingMessages = messages.toArray(new String[0]);
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messages.clear();
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}
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for (int i = 0; i < connections.size(); i++) {
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try {
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PrintWriter writer = connections.get(i).getWriter();
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for (int j = 0; j < pendingMessages.length; j++) {
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// FIXME: Add HTML filtering
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writer.println(pendingMessages[j] + "<br/>");
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}
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writer.flush();
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} catch (IOException e) {
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log("IOExeption sending message", e);
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}
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}
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}
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}
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}
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}
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}
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