| /* |
| * 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.sling.maven.slingstart.run; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStreamWriter; |
| import java.net.InetSocketAddress; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| |
| /** |
| * Control listener. |
| * This class listens for the startup of a launchpad instance. |
| */ |
| public class ControlListener implements Runnable { |
| |
| // command sent by the client to notify startup |
| private static final String COMMAND_STARTED = "started"; |
| |
| private static final String RESPONSE_OK = "ok"; |
| |
| // The default interface to listen on |
| private static final String DEFAULT_LISTEN_INTERFACE = "127.0.0.1"; |
| |
| // The port to listen on |
| private final int port; |
| |
| private volatile boolean started = false; |
| |
| private volatile boolean stopped = false; |
| |
| private volatile ServerSocket server; |
| |
| public ControlListener(final int p) { |
| this.port = p; |
| final Thread listener = new Thread(this); |
| listener.setDaemon(true); |
| listener.setName("Launchapd startup listener"); |
| listener.start(); |
| } |
| |
| public int getPort() { |
| return this.port; |
| } |
| |
| public boolean isStarted() { |
| return this.started; |
| } |
| |
| public void stop() { |
| stopped = true; |
| if ( server != null ) { |
| try { |
| server.close(); |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| } |
| |
| /** |
| * Implements the server thread receiving commands from clients and acting |
| * upon them. |
| */ |
| @Override |
| public void run() { |
| final InetSocketAddress socketAddress = getSocketAddress(this.port); |
| try { |
| server = new ServerSocket(); |
| server.bind(socketAddress); |
| } catch (final IOException ioe) { |
| return; |
| } |
| |
| try { |
| while (!stopped) { |
| |
| final Socket s = server.accept(); |
| |
| try { |
| final String commandLine = readLine(s); |
| if (commandLine == null) { |
| final String msg = "ERR: missing command"; |
| writeLine(s, msg); |
| continue; |
| } |
| |
| final String command = commandLine; |
| |
| if (COMMAND_STARTED.equals(command)) { |
| writeLine(s, RESPONSE_OK); |
| this.started = true; |
| this.stopped = true; |
| break; |
| |
| } else { |
| final String msg = "ERR:" + command; |
| writeLine(s, msg); |
| |
| } |
| } finally { |
| try { |
| s.close(); |
| } catch (IOException ignore) { |
| } |
| } |
| } |
| } catch (final IOException ioe) { |
| // ignore |
| } finally { |
| try { |
| server.close(); |
| } catch (final IOException ignore) { |
| // ignore |
| } |
| } |
| } |
| |
| private String readLine(final Socket socket) throws IOException { |
| final BufferedReader br = new BufferedReader(new InputStreamReader( |
| socket.getInputStream(), "UTF-8")); |
| return br.readLine(); |
| } |
| |
| private void writeLine(final Socket socket, final String line) throws IOException { |
| final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter( |
| socket.getOutputStream(), "UTF-8")); |
| bw.write(line); |
| bw.write("\r\n"); |
| bw.flush(); |
| } |
| |
| private static InetSocketAddress getSocketAddress(final int port) { |
| final String address = DEFAULT_LISTEN_INTERFACE; |
| |
| final InetSocketAddress addr = new InetSocketAddress(address, port); |
| if (!addr.isUnresolved()) { |
| return addr; |
| } |
| |
| return null; |
| } |
| } |