author | herrick |
Fri, 16 Nov 2018 14:53:42 -0500 | |
branch | JDK-8200758-branch |
changeset 57028 | 51cc1a1f91f3 |
parent 57017 | 1b08af362a30 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.jpackager.runtime.singleton; |
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import java.io.BufferedReader; |
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import java.io.File; |
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import java.io.FileReader; |
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import java.io.IOException; |
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import java.io.InputStreamReader; |
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import java.io.OutputStream; |
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import java.io.PrintStream; |
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import java.net.Socket; |
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import java.nio.charset.Charset; |
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/** |
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* The {@code SingleInstanceService} class provides public methods for using |
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* Single Instance functionality in applications packaged by jpackager. |
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* To use these methods, the option named "--singleton" must |
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* be specified on the jpackager command line. |
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* |
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* @since 12 |
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*/ |
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public class SingleInstanceService { |
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static private boolean DEBUG = false; |
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static private PrintStream DEBUG_STREAM = null; |
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static private int currPort; |
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static private String stringId = null; |
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static private String randomNumberString = null; |
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static private SingleInstanceImpl instance = null; |
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static final int ENCODING_PLATFORM = 1; |
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static final int ENCODING_UNICODE = 2; |
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static final String ENCODING_PLATFORM_NAME = "UTF-8"; |
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static final String ENCODING_UNICODE_NAME = "UTF-16LE"; |
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static final String APP_ID_PREFIX = "jpackager.si."; |
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private SingleInstanceService() {} |
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static void enableDebug(boolean enable, PrintStream stream) { |
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DEBUG = enable; |
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DEBUG_STREAM = stream; |
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} |
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static void trace(String message) { |
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if (DEBUG && DEBUG_STREAM != null) { |
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DEBUG_STREAM.println(message); |
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} |
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} |
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static void trace(Throwable t) { |
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if (DEBUG && DEBUG_STREAM != null) { |
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t.printStackTrace(DEBUG_STREAM); |
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} |
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} |
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/** |
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* Adds the given slistener for the current process. |
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* |
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* If the given slistener object is null or |
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* has already been added, then nothing is added. |
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* |
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* @param slistener the {@code SingleInstanceListener} to add |
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*/ |
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public static void addSingleInstanceListener( |
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SingleInstanceListener slistener) { |
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if (instance == null) { |
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synchronized(SingleInstanceService.class) { |
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if (instance == null) { |
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instance = new SingleInstanceImpl(); |
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} |
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} |
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} |
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instance.addSingleInstanceListener(slistener, |
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APP_ID_PREFIX + ProcessHandle.current().pid()); |
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} |
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/** |
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* removes the given slistener for the current process. |
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* |
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* If the given slistener object is null or |
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* has not already been added, nothing is removed. |
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* |
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* @param slistener the {@code SingleInstanceListener} to remove. |
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*/ |
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public static void removeSingleInstanceListener( |
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SingleInstanceListener slistener) { |
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if (instance != null) { |
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instance.removeSingleInstanceListener(slistener); |
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} |
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} |
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/** |
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* Returns true if single instance server is running for the id |
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*/ |
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static boolean isServerRunning(String id) { |
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trace("isServerRunning ? : "+ id); |
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File siDir = new File(SingleInstanceImpl.SI_FILEDIR); |
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String[] fList = siDir.list(); |
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if (fList != null) { |
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String prefix = SingleInstanceImpl.getSingleInstanceFilePrefix(id); |
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for (String file : fList) { |
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trace("isServerRunning: " + file); |
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trace("\t String id: " + id); |
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trace("\t SingleInstanceFilePrefix: " + prefix); |
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// if file with the same prefix already exist, server is running |
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if (file.startsWith(prefix)) { |
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try { |
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currPort = Integer.parseInt( |
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file.substring(file.lastIndexOf('_') + 1)); |
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trace("isServerRunning: " + file |
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+ ": port: " + currPort); |
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} catch (NumberFormatException nfe) { |
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trace("isServerRunning: " + file |
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+ ": port parsing failed"); |
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trace(nfe); |
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return false; |
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} |
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trace("Server running at port: " + currPort); |
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File siFile = new File(SingleInstanceImpl.SI_FILEDIR, file); |
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// get random number from single instance file |
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try (BufferedReader br = new BufferedReader( |
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new FileReader(siFile))) { |
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randomNumberString = br.readLine(); |
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trace("isServerRunning: " + file + ": magic: " |
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+ randomNumberString); |
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} catch (IOException ioe ) { |
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trace("isServerRunning: " + file |
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+ ": reading magic failed"); |
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trace(ioe); |
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} |
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trace("isServerRunning: " + file + ": setting id - OK"); |
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stringId = id; |
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return true; |
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164 |
} else { |
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trace("isServerRunning: " + file + ": prefix NOK"); |
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} |
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167 |
} |
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168 |
} else { |
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trace("isServerRunning: empty file list"); |
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} |
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trace("isServerRunning: false"); |
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return false; |
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173 |
} |
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174 |
|
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/** |
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* Returns true if we connect successfully to the server for the stringId |
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*/ |
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static boolean connectToServer(String[] args) { |
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trace("Connect to: " + stringId + " " + currPort); |
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180 |
|
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181 |
if (randomNumberString == null) { |
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// should not happen |
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trace("MAGIC number is null, bail out."); |
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184 |
return false; |
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185 |
} |
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186 |
|
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// Now we open the tcpSocket and the stream |
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188 |
Socket socket = null; |
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189 |
OutputStream os = null; |
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PrintStream out = null; |
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191 |
InputStreamReader isr = null; |
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BufferedReader br = null; |
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193 |
try { |
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socket = new Socket("127.0.0.1", currPort); |
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195 |
os = socket.getOutputStream(); |
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196 |
byte[] encoding = new byte[1]; |
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197 |
encoding[0] = ENCODING_PLATFORM; |
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198 |
os.write(encoding); |
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199 |
String encodingName = Charset.defaultCharset().name(); |
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200 |
|
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201 |
out = new PrintStream(os, true, encodingName); |
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isr = new InputStreamReader(socket.getInputStream(), encodingName); |
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203 |
br = new BufferedReader(isr); |
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204 |
|
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205 |
// send random number |
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|
206 |
out.println(randomNumberString); |
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|
207 |
// send MAGICWORD |
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|
208 |
out.println(SingleInstanceImpl.SI_MAGICWORD); |
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|
209 |
|
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210 |
for (String arg : args) { |
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|
211 |
out.println(arg); |
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|
212 |
} |
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|
213 |
|
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214 |
// indicate end of file transmission |
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215 |
out.println(SingleInstanceImpl.SI_EOF); |
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|
216 |
out.flush(); |
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|
217 |
|
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218 |
// wait for ACK (OK) response |
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|
219 |
trace("Waiting for ack"); |
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|
220 |
final int tries = 5; |
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|
221 |
|
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|
222 |
// try to listen for ACK |
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|
223 |
for (int i=0; i < tries; i++) { |
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|
224 |
String str = br.readLine(); |
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|
225 |
if (str != null && str.equals(SingleInstanceImpl.SI_ACK)) { |
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|
226 |
trace("Got ACK"); |
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|
227 |
return true; |
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|
228 |
} |
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|
229 |
} |
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|
230 |
} catch (java.net.SocketException se) { |
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|
231 |
// no server is running - continue launch |
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|
232 |
trace("No server is running - continue launch."); |
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|
233 |
trace(se); |
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|
234 |
} catch (Exception ioe) { |
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|
235 |
trace(ioe); |
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|
236 |
} |
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|
237 |
finally { |
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|
238 |
try { |
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|
239 |
if (br != null) { |
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|
240 |
br.close(); |
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|
241 |
} |
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|
242 |
if (isr != null) { |
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|
243 |
isr.close(); |
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|
244 |
} |
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|
245 |
if (out != null) { |
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|
246 |
out.close(); |
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|
247 |
} |
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|
248 |
if (os != null) { |
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|
249 |
os.close(); |
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|
250 |
} |
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|
251 |
if (socket != null) { |
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|
252 |
socket.close(); |
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|
253 |
} |
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|
254 |
} catch (IOException ioe) { |
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|
255 |
trace(ioe); |
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|
256 |
} |
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|
257 |
} |
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|
258 |
trace("No ACK from server, bail out."); |
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|
259 |
return false; |
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|
260 |
} |
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|
261 |
} |