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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// apps
//
// = FILENAME
// Proxy_Handler.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#if !defined (_PROXY_HANDLER)
#define _PROXY_HANDLER
#include "ace/Service_Config.h"
#include "ace/SOCK_Connector.h"
#include "ace/Svc_Handler.h"
#include "Event_Forwarding_Discriminator.h"
#include "Consumer_Dispatch_Set.h"
#include "Event.h"
// Forward declaration.
class Proxy_Handler_Connector;
class ACE_Event_Channel;
class Proxy_Handler : public ACE_Svc_Handler<ACE_SOCK_STREAM, SYNCH_STRATEGY>
// = TITLE
// Proxy_Handler contains info about connection state and addressing.
//
// = DESCRIPTION
// The Proxy_Handler classes process events sent to the Event
// Channel from Suppliers and forward them to Consumers.
{
public:
Proxy_Handler (ACE_Event_Channel &,
const ACE_INET_Addr &remote_addr,
const ACE_INET_Addr &local_addr,
ACE_INT32 conn_id);
virtual int open (void * = 0);
// Initialize and activate a single-threaded Proxy_Handler (called by
// ACE_Connector::handle_output()).
ACE_INET_Addr &remote_addr (void);
// Returns the peer's routing address.
ACE_INET_Addr &local_addr (void);
// Returns our local address.
// = Set/get routing id.
ACE_INT32 id (void);
void id (ACE_INT32);
// = The current state of the Proxy_Handler.
enum State
{
IDLE = 1, // Prior to initialization.
CONNECTING, // During connection establishment.
ESTABLISHED, // Proxy_Handler is established and active.
DISCONNECTING, // Proxy_Handler is in the process of connecting.
FAILED // Proxy_Handler has failed.
};
// = Set/get the current state.
void state (State);
State state (void);
// = Set/get the current retry timeout delay.
void timeout (int);
int timeout (void);
// = Set/get the maximum retry timeout delay.
void max_timeout (int);
int max_timeout (void);
// = Set/get proxy role (i.e., 'S' for Supplier and 'C' for Consumer
// (necessary for error checking).
void proxy_role (char);
char proxy_role (void);
// = The total number of bytes sent/received on this proxy.
size_t total_bytes (void);
void total_bytes (size_t bytes);
// Increment count by <bytes>.
virtual int handle_timeout (const ACE_Time_Value &, const void *arg);
// Perform timer-based Proxy_Handler reconnection.
protected:
enum
{
MAX_RETRY_TIMEOUT = 300 // 5 minutes is the maximum timeout.
};
virtual int handle_close (ACE_HANDLE = ACE_INVALID_HANDLE,
ACE_Reactor_Mask = ACE_Event_Handler::ALL_EVENTS_MASK);
// Perform Proxy_Handler termination.
ACE_INET_Addr remote_addr_;
// Address of peer.
ACE_INET_Addr local_addr_;
// Address of us.
ACE_INT32 id_;
// The assigned routing ID of this entry.
size_t total_bytes_;
// The total number of bytes sent/received on this proxy.
State state_;
// The current state of the proxy.
int timeout_;
// Amount of time to wait between reconnection attempts.
int max_timeout_;
// Maximum amount of time to wait between reconnection attempts.
char proxy_role_;
// Indicates which role the proxy plays ('S' == Supplier and 'C' ==
// Consumer).
ACE_Event_Channel &event_channel_;
// Reference to the <ACE_Event_Channel> that we use to forward all
// the events from Consumers and Suppliers.
};
class Supplier_Proxy : public Proxy_Handler
// = TITLE
// Handles reception of Events from Suppliers
//
// = DESCRIPTION
// Performs framing and error checking.
{
public:
// = Initialization method.
Supplier_Proxy (ACE_Event_Channel &,
const ACE_INET_Addr &remote_addr,
const ACE_INET_Addr &local_addr,
ACE_INT32 conn_id);
protected:
// = All the following methods are upcalls, so they can be protected.
virtual int handle_input (ACE_HANDLE = ACE_INVALID_HANDLE);
// Receive and process peer events.
virtual int recv (ACE_Message_Block *&);
// Receive an event from a Supplier.
int forward (ACE_Message_Block *event);
// Forward the <event> to its appropriate Consumer. This delegates
// to the <ACE_Event_Channel> to do the actual forwarding.
ACE_Message_Block *msg_frag_;
// Keep track of event fragment to handle non-blocking recv's from
// Suppliers.
};
class Consumer_Proxy : public Proxy_Handler
// = TITLE
// Handles transmission of events to Consumers.
//
// = DESCRIPTION
// Performs queueing and error checking. Uses a single-threaded
// Reactive approach to handle flow control.
{
public:
// = Initialization method.
Consumer_Proxy (ACE_Event_Channel &,
const ACE_INET_Addr &remote_addr,
const ACE_INET_Addr &local_addr,
ACE_INT32 conn_id);
virtual int put (ACE_Message_Block *event,
ACE_Time_Value * = 0);
// Send an event to a Consumer (may be queued if necessary).
protected:
// = We'll allow up to 16 megabytes to be queued per-output proxy.
enum {MAX_QUEUE_SIZE = 1024 * 1024 * 16};
virtual int handle_output (ACE_HANDLE);
// Finish sending event when flow control conditions abate.
int nonblk_put (ACE_Message_Block *mb);
// Perform a non-blocking put().
virtual ssize_t send (ACE_Message_Block *);
// Send an event to a Consumer.
virtual int handle_input (ACE_HANDLE);
// Receive and process shutdowns from a Consumer.
};
#endif /* _PROXY_HANDLER */
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