[2155] | 1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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| 2 | // |
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| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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| 4 | // you may not use this file except in compliance with the License. |
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| 5 | // You may obtain a copy of the License at |
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| 6 | // |
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| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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| 8 | // |
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| 9 | // Unless required by applicable law or agreed to in writing, software |
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| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 12 | // See the License for the specific language governing permissions and |
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| 13 | // limitations under the License. |
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| 14 | |
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| 15 | package de.ugoe.cs.autoquest.genericeventmonitor; |
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| 16 | |
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| 17 | import java.util.EnumSet; |
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| 18 | |
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| 19 | import javax.servlet.DispatcherType; |
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| 20 | |
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| 21 | import org.eclipse.jetty.server.Server; |
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| 22 | import org.eclipse.jetty.servlet.FilterHolder; |
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| 23 | import org.eclipse.jetty.servlet.ServletContextHandler; |
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| 24 | import org.eclipse.jetty.servlet.ServletHolder; |
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| 25 | import org.eclipse.jetty.servlets.CrossOriginFilter; |
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| 26 | |
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| 27 | import de.ugoe.cs.util.console.Console; |
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| 28 | |
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| 29 | /** |
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| 30 | * <p> |
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| 31 | * this is the web server, that receives the events. It is initialized with a port on which it |
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| 32 | * shall listen, as well as a message listener to forward the received messages to. Internally it |
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| 33 | * starts a jetty web server with a single {@link GenericEventMonitorServlet} to receive the |
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| 34 | * events. |
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| 35 | * </p> |
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| 36 | * |
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| 37 | * @author Patrick Harms |
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| 38 | */ |
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| 39 | class GenericEventMonitorServer implements GenericEventMonitorComponent { |
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| 40 | |
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| 41 | /** |
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| 42 | * the port to listen on |
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| 43 | */ |
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| 44 | private int port; |
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| 45 | |
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| 46 | /** |
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| 47 | * the jetty web server used for receiving messages |
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| 48 | */ |
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| 49 | private Server server; |
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| 50 | |
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| 51 | /** |
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| 52 | * the message listener to forward the messages to |
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| 53 | */ |
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| 54 | private GenericEventMonitorMessageListener messageListener; |
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| 55 | |
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| 56 | /** |
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| 57 | * <p> |
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| 58 | * initializes the server with the port to listen on and the message listener to forward |
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| 59 | * the messages to. |
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| 60 | * </p> |
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| 61 | * |
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| 62 | * @param port the port to listen on |
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| 63 | * @param messageListener the message listener to forward the messages to |
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| 64 | */ |
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| 65 | GenericEventMonitorServer(int port, GenericEventMonitorMessageListener messageListener) { |
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| 66 | this.port = port; |
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| 67 | this.messageListener = messageListener; |
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| 68 | } |
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| 69 | |
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| 70 | /* (non-Javadoc) |
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| 71 | * @see de.ugoe.cs.autoquest.genericeventmonitor.GenericEventMonitorComponent#init() |
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| 72 | */ |
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| 73 | @Override |
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| 74 | public synchronized void init() { |
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| 75 | if (server != null) { |
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| 76 | throw new IllegalStateException("already initialized. First call stop()"); |
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| 77 | } |
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| 78 | |
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| 79 | server = new Server(port); |
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| 80 | |
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| 81 | /* |
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| 82 | // the following code can be used to support SSL directly |
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| 83 | server = new Server(); |
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| 84 | |
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| 85 | SslSocketConnector connector = new SslSocketConnector(); |
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| 86 | connector.setPort(port); |
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| 87 | connector.setKeystore("data/keystore"); |
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| 88 | connector.setPassword("123456"); |
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| 89 | connector.setKeyPassword("123456"); |
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| 90 | connector.setTruststore("data/keystore"); |
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| 91 | connector.setTrustPassword("123456"); |
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| 92 | server.addConnector(connector);*/ |
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| 93 | |
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| 94 | ServletContextHandler root = |
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| 95 | new ServletContextHandler(server, "/", ServletContextHandler.SESSIONS); |
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| 96 | |
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| 97 | GenericEventMonitorServlet servlet = new GenericEventMonitorServlet(messageListener); |
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| 98 | ServletHolder servletHolder = new ServletHolder(servlet); |
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| 99 | root.addServlet(servletHolder, "/*"); |
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| 100 | |
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| 101 | CrossOriginFilter filter = new CrossOriginFilter(); |
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| 102 | FilterHolder filterHolder = new FilterHolder(filter); |
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| 103 | filterHolder.setInitParameter("allowedOrigins", "*"); |
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| 104 | filterHolder.setInitParameter("allowedMethods", "GET,POST"); |
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| 105 | root.addFilter(filterHolder, "/*", EnumSet.allOf(DispatcherType.class)); |
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| 106 | } |
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| 107 | |
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| 108 | /* (non-Javadoc) |
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| 109 | * @see de.ugoe.cs.autoquest.genericeventmonitor.GenericEventMonitorComponent#start() |
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| 110 | */ |
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| 111 | @Override |
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| 112 | public synchronized void start() throws GenericEventMonitorException { |
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| 113 | if (server == null) { |
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| 114 | throw new IllegalStateException("server not initialized yet. First call init()"); |
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| 115 | } |
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| 116 | |
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| 117 | try { |
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| 118 | server.start(); |
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| 119 | } |
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| 120 | catch (Exception e) { |
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| 121 | throw new GenericEventMonitorException("could not start server", e); |
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| 122 | } |
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| 123 | } |
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| 124 | |
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| 125 | |
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| 126 | /* (non-Javadoc) |
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| 127 | * @see de.ugoe.cs.autoquest.genericeventmonitor.GenericEventMonitorComponent#stop() |
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| 128 | */ |
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| 129 | @Override |
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| 130 | public synchronized void stop() { |
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| 131 | try { |
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| 132 | if (server != null) { |
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| 133 | server.stop(); |
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| 134 | } |
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| 135 | } |
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| 136 | catch (Exception e) { |
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| 137 | Console.printerrln("could not stop generic event monitor server: " + e.getMessage()); |
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| 138 | Console.logException(e); |
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| 139 | } |
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| 140 | } |
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| 141 | |
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| 142 | } |
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