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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.Diagnostics;

namespace IceInternal
{

    public abstract class EventHandler
    {
	//
	// Return true if the handler is for a datagram transport, false otherwise.
	//
	abstract public bool datagram();
	
	//
	// Return true if read() must be called before calling message().
	//
	abstract public bool readable();
	
	//
	// Read data via the event handler. May only be called if
	// readable() returns true.
	//
	abstract public void read(BasicStream istr);
	
	//
	// A complete message has been received.
	//
	abstract public void message(BasicStream stream, ThreadPool threadPool);
	
	//
	// Will be called if the event handler is finally
	// unregistered. (Calling unregister() does not unregister
	// immediately.)
	//
	abstract public void finished(ThreadPool threadPool);
	
	//
	// Propagate an exception to the event handler.
	//
	abstract public void exception(Ice.LocalException ex);
	
	//
	// Get a textual representation of the event handler.
	//
	public abstract override string ToString();
	
        public Instance instance()
        {
            return instance_;
        }

	protected internal EventHandler(Instance instance)
	{
	    instance_ = instance;
	    stream_ = new BasicStream(instance);
	}

	protected internal Instance instance_;
	
	//
	// The stream_ data member is for use by ThreadPool only.
	//
	internal BasicStream stream_;
    }

}