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/* -*- C++ -*- */
#ifndef _CONSUMER_ROUTER_H
#define _CONSUMER_ROUTER_H
#include "ace/SOCK_Acceptor.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/UPIPE_Acceptor.h"
#include "ace/Svc_Handler.h"
#include "ace/RW_Thread_Mutex.h"
#include "Peer_Router.h"
class Consumer_Router : public Peer_Router
{
// = TITLE
// Provides the interface between one or more Consumers and the
// Event Server <ACE_Stream>.
//
// = DESCRIPTION
// This class normally sits on "top" of the Stream and routes
// messages coming from "downstream" to all the Consumers
// connected to it via its "read" <Task>. Normally, the messages
// flow up the stream from <Supplier_Router>s. However, if
// Consumers transmit data to the <Consumer_Router>, we dutifully
// push it out to the Suppliers via the <Supplier_Router>.
//
// When used on the "reader" side of a Stream, the
// <Consumer_Router> simply forwards all messages up the stream.
// When used on the "writer" side, the <Consumer_Router> queues
// up outgoing messages to suppliers and sends them down to the
// <Supplier_Router> in a separate thread. The reason for this
// is that it's really an "error" for a <Consumer_Router> to
// send messages to Suppliers, so we don't expect this to happen
// very much. When it does we use a separate thread to avoid
// taxing the main thread, which processes "normal" messages.
//
// All of the methods in this class except the constructor are
// called via base class pointers by the <ACE_Stream>.
// Therefore, we can put them in the protected section.
public:
Consumer_Router (Peer_Router_Context *prc);
// Initialization method.
protected:
// = ACE_Task hooks.
virtual int open (void *a = 0);
// Called by the Stream to initialize the router.
virtual int close (u_long flags = 0);
// Called by the Stream to shutdown the router.
virtual int put (ACE_Message_Block *msg, ACE_Time_Value * = 0);
// Called by the <Peer_Handler> to pass a message to the
// <Consumer_Router>. The <Consumer_Router> queues up this message,
// which is then processed in the <svc> method in a separate thread.
virtual int svc ();
// Runs in a separate thread to dequeue messages and pass them up
// the stream.
// = Dynamic linking hooks.
virtual int info (ACE_TCHAR **info_string, size_t length) const;
// Returns information about this service.
};
#endif /* _CONSUMER_ROUTER_H */
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