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// **********************************************************************
//
// Copyright (c) 2001
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
package IceInternal;
abstract class EventHandler
{
//
// Return true if read() must be called before calling message().
//
abstract boolean readable();
//
// Try to read data (non-blocking) via the event handler. Returns
// true if a subsequent call to read() is necessary, false otherwise.
// May only be called if readable() returns true.
//
abstract boolean tryRead(BasicStream is);
//
// Read data via the event handler. May only be called if
// readable() returns true.
//
abstract void read(BasicStream is);
//
// A complete message has been received.
//
abstract void message(BasicStream stream, ThreadPool threadPool);
//
// Will be called if the event handler is finally
// unregistered. (Calling unregister() does not unregister
// immediately.)
//
abstract void finished(ThreadPool threadPool);
//
// Propagate an exception to the event handler.
//
abstract void exception(Ice.LocalException ex);
//
// Try to destroy the event handler. Returns false if the event
// handler cannot be destroyed because it is in use, or true
// otherwise.
//
// abstract boolean tryDestroy(ThreadPool threadPool);
protected
EventHandler(Instance instance)
{
_instance = instance;
_stream = new BasicStream(instance);
}
protected Instance _instance;
//
// The _stream data member is for use by ThreadPool only
//
BasicStream _stream;
}
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