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// **********************************************************************
//
// Copyright (c) 2002
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
package Ice;
public abstract class Application
{
public
Application()
{
}
//
// This main() must be called by the global main(). main()
// initializes the Communicator, calls run(), and destroys
// the Communicator upon return from run(). It thereby handles
// all exceptions properly, i.e., error messages are printed
// if exceptions propagate to main(), and the Communicator is
// always destroyed, regardless of exceptions.
//
public final int
main(String appName, String[] args)
{
return main(appName, args, null);
}
public final int
main(String appName, String[] args, String configFile)
{
if(_communicator != null)
{
System.err.println(appName + ": only one instance of the " +
"Application class can be used");
return 1;
}
_appName = appName;
int status = 0;
try
{
StringSeqHolder argHolder = new StringSeqHolder(args);
if(configFile != null)
{
Properties properties = Util.createProperties(argHolder);
properties.load(configFile);
_communicator = Util.initializeWithProperties(argHolder, properties);
}
else
{
_communicator = Util.initialize(argHolder);
}
status = run(argHolder.value);
}
catch(LocalException ex)
{
System.err.println(_appName + ": " + ex);
ex.printStackTrace();
status = 1;
}
catch(Exception ex)
{
System.err.println(_appName + ": unknown exception");
ex.printStackTrace();
status = 1;
}
if(_communicator != null)
{
try
{
_communicator.destroy();
}
catch(LocalException ex)
{
System.err.println(_appName + ": " + ex);
ex.printStackTrace();
status = 1;
}
catch(Exception ex)
{
System.err.println(_appName + ": unknown exception");
ex.printStackTrace();
status = 1;
}
_communicator = null;
}
synchronized(this)
{
if(_shutdownHook != null)
{
_shutdownHook.done();
}
}
return status;
}
public abstract int
run(String[] args);
//
// Return the application name, i.e., argv[0].
//
public static String
appName()
{
return _appName;
}
//
// One limitation of this class is that there can only be one
// Application instance, with one global Communicator, accessible
// with this communicator() operation. This limitiation is due to
// how the signal handling functions below operate. If you require
// multiple Communicators, then you cannot use this Application
// framework class.
//
public static Communicator
communicator()
{
return _communicator;
}
synchronized public static void
shutdownOnInterrupt()
{
if(_shutdownHook == null)
{
//
// As soon as the shutdown hook ends all the threads are
// terminated. So the shutdown hook will join the current
// thread before to end.
//
_shutdownHook = new ShutdownHook();
try
{
Runtime.getRuntime().addShutdownHook(_shutdownHook);
}
catch(java.lang.IllegalStateException ex)
{
if(_communicator != null)
{
_communicator.shutdown();
}
}
}
}
synchronized public static void
ignoreInterrupt()
{
//
// We cannot ignore, only set back to default.
//
defaultInterrupt();
}
synchronized public static void
defaultInterrupt()
{
if(_shutdownHook != null)
{
try
{
Runtime.getRuntime().removeShutdownHook(_shutdownHook);
_shutdownHook = null;
}
catch(java.lang.IllegalStateException ex)
{
//
// Expected if we are in the process of shutting down.
//
}
}
}
static class ShutdownHook extends Thread
{
ShutdownHook()
{
_done = false;
}
public void
run()
{
synchronized(_doneMutex)
{
communicator().signalShutdown();
while(!_done)
{
try
{
_doneMutex.wait();
}
catch(InterruptedException ex)
{
}
}
}
}
void
done()
{
synchronized(_doneMutex)
{
_done = true;
_doneMutex.notify();
}
}
private boolean _done;
private java.lang.Object _doneMutex = new java.lang.Object();
}
private static String _appName;
private static Communicator _communicator;
private static ShutdownHook _shutdownHook;
}
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