jtulach@106: package org.apidesign.deadlock.startuplock;
jtulach@106: 
jtulach@106: import java.io.DataOutputStream;
jtulach@106: import java.io.File;
jtulach@106: import java.io.FileOutputStream;
jtulach@106: import java.io.IOException;
jtulach@106: import java.net.ServerSocket;
jtulach@106: import java.util.logging.Level;
jtulach@106: import java.util.logging.Logger;
jtulach@106: 
jtulach@106: public final class CLIHandlerBlocking {
jtulach@106:     // BEGIN: cli.real
jtulach@106:     public static int start(File lockFile) throws IOException {
jtulach@106:         enterState(10);
jtulach@106:         if (lockFile.exists ()) {
jtulach@106:             // read the port number and connect to it
jtulach@106:             enterState(11);
jtulach@106:             int alive = readPortNumber(lockFile);
jtulach@106:             if (alive != -1) {
jtulach@106:                 // exit
jtulach@106:                 return alive;
jtulach@106:             }
jtulach@106:         }
jtulach@106:         // otherwise try to create the file yourself
jtulach@106:         enterState(20);
jtulach@106:         lockFile.createNewFile();
jtulach@106:         DataOutputStream os = new DataOutputStream(new FileOutputStream(lockFile));
jtulach@106:         ServerSocket server = new ServerSocket();
jtulach@106:         enterState(21);
jtulach@106:         int p = server.getLocalPort();
jtulach@106:         enterState(22);
jtulach@106:         os.writeInt(p);
jtulach@106:         enterState(23);
jtulach@106:         
jtulach@106:         return p;
jtulach@106:     }
jtulach@106:     // END: cli.real
jtulach@106: 
jtulach@106:     private static Logger LOG = Logger.getLogger(CLIHandlerBlocking.class.getName());
jtulach@106:     private static void enterState(int state) {
jtulach@106:         LOG.log(Level.FINEST, "enterState {0}", state);
jtulach@106:     }
jtulach@106: 
jtulach@106:     private static int readPortNumber(File lockFile) throws IOException {
jtulach@106:         return -1;
jtulach@106:     }
jtulach@106: }