95 lines
2.7 KiB
Java
95 lines
2.7 KiB
Java
/*******************************************************************************
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* Copyright (c) 2011 Ziver Koc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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******************************************************************************/
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package zutil;
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import java.io.IOException;
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import java.net.ServerSocket;
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import java.net.Socket;
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import zutil.io.MultiPrintStream;
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/**
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* This class checks if the app is alredy running
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* by Locking a port
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*
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* @author Ziver Koc
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*/
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public class OneInstanceNetwork extends Thread implements OneInstance{
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private int port;
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/**
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* Creates a One App objekt
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*
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* @param port The port to lock
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*/
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public OneInstanceNetwork(int port){
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this.port = port;
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}
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/**
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* Starts the port lock
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*
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* @return Always true
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*/
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public boolean lockApp(){
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this.start();
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return true;
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}
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/**
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* he port lock thread
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* should not be cald outside the class
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*/
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public void run() {
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ServerSocket serverSocket = null;
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Socket clientSocket = null;
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try {
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// Create the server socket
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serverSocket = new ServerSocket(port, 1);
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while (true) {
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// Wait for a connection
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clientSocket = serverSocket.accept();
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clientSocket.close();
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}
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}
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catch (IOException ioe) {
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MultiPrintStream.out.println("Error in JustOneServer: " + ioe);
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}
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}
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/**
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* Checks if the port is locked
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*
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* @return True if port is locked else false
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*/
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public boolean check() {
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try {
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Socket clientSocket = new Socket("localhost", port);
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MultiPrintStream.out.println("Already running!!!");
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clientSocket.close();
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return true;
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}
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catch (Exception e) {
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return false;
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}
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}
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}
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