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// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************

using System;
using System.Threading;
using System.Collections;
using Demo;

public class WorkQueue
{
    private class CallbackEntry
    {
        public AMD_Hello_sayHello cb;
	public int delay;
    }

    public void Join()
    {
        thread_.Join();
    }

    public void Start()
    {
        thread_ = new Thread(new ThreadStart(Run));
	thread_.Start();
    }

    public void Run()
    {
        lock(this)
	{
	    while(!_done)
	    {
	        if(_callbacks.Count == 0)
		{
		    Monitor.Wait(this);
		}

		if(_callbacks.Count != 0)
		{
		    //
		    // Get next work item.
		    //
		    CallbackEntry entry = (CallbackEntry)_callbacks[0];

		    //
		    // Wait for the amount of time indicated in delay to
		    // emulate a process that takes a significant period of
		    // time to complete.
		    //
		    Monitor.Wait(this, entry.delay);

		    if(!_done)
		    {
		        //
			// Print greeting and send response.
			//
			_callbacks.RemoveAt(0);
			Console.Out.WriteLine("Belated Hello World!");
			entry.cb.ice_response();
		    }
		}
	    }

	    foreach(CallbackEntry e in _callbacks)
	    {
	        e.cb.ice_exception(new RequestCanceledException());
	    }
	}
    }

    public void Add(AMD_Hello_sayHello cb, int delay)
    {
        lock(this)
	{
	    if(!_done)
	    {
	        //
		// Add the work item.
		//
		CallbackEntry entry = new CallbackEntry();
		entry.cb = cb;
		entry.delay = delay;

		if(_callbacks.Count == 0)
		{
		    Monitor.Pulse(this);
		}
		_callbacks.Add(entry);
	    }
	    else
	    {
	        //
		// Destroyed, throw exception.
		//
		cb.ice_exception(new RequestCanceledException());
	    }
	}
    }

    public void destroy()
    {
        lock(this)
	{
	    _done = true;
	    Monitor.Pulse(this);
	}
    }

    private ArrayList _callbacks = new ArrayList();
    private bool _done = false;
    private Thread thread_;
}