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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2011 VMware, Inc.
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads project.
Crossroads is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __XS_SOCKET_BASE_HPP_INCLUDED__
#define __XS_SOCKET_BASE_HPP_INCLUDED__
#include <string>
#include "own.hpp"
#include "array.hpp"
#include "stdint.hpp"
#include "poller.hpp"
#include "atomic_counter.hpp"
#include "i_poll_events.hpp"
#include "mailbox.hpp"
#include "stdint.hpp"
#include "pipe.hpp"
namespace xs
{
class ctx_t;
class msg_t;
class pipe_t;
class socket_base_t :
public own_t,
public array_item_t <>,
public i_poll_events,
public i_pipe_events
{
friend class reaper_t;
public:
// Returns false if object is not a socket.
bool check_tag ();
// Create a socket of a specified type.
static socket_base_t *create (int type_, xs::ctx_t *parent_,
uint32_t tid_, int sid_);
// Returns the mailbox associated with this socket.
mailbox_t *get_mailbox ();
// Interrupt blocking call if the socket is stuck in one.
// This function can be called from a different thread!
void stop ();
// Interface for communication with the API layer.
int setsockopt (int option_, const void *optval_, size_t optvallen_);
int getsockopt (int option_, void *optval_, size_t *optvallen_);
int bind (const char *addr_);
int connect (const char *addr_);
int send (xs::msg_t *msg_, int flags_);
int recv (xs::msg_t *msg_, int flags_);
int close ();
// These functions are used by the polling mechanism to determine
// which events are to be reported from this socket.
bool has_in ();
bool has_out ();
// Using this function reaper thread ask the socket to regiter with
// its poller.
void start_reaping (poller_t *poller_);
// i_poll_events implementation. This interface is used when socket
// is handled by the poller in the reaper thread.
void in_event (fd_t fd_);
void out_event (fd_t fd_);
void timer_event (int id_);
// i_pipe_events interface implementation.
void read_activated (pipe_t *pipe_);
void write_activated (pipe_t *pipe_);
void hiccuped (pipe_t *pipe_);
void terminated (pipe_t *pipe_);
protected:
socket_base_t (xs::ctx_t *parent_, uint32_t tid_, int sid_);
virtual ~socket_base_t ();
// Concrete algorithms for the x- methods are to be defined by
// individual socket types.
virtual void xattach_pipe (xs::pipe_t *pipe_) = 0;
// The default implementation assumes there are no specific socket
// options for the particular socket type. If not so, overload this
// method.
virtual int xsetsockopt (int option_, const void *optval_,
size_t optvallen_);
// The default implementation assumes that send is not supported.
virtual bool xhas_out ();
virtual int xsend (xs::msg_t *msg_, int flags_);
// The default implementation assumes that recv in not supported.
virtual bool xhas_in ();
virtual int xrecv (xs::msg_t *msg_, int flags_);
// i_pipe_events will be forwarded to these functions.
virtual void xread_activated (pipe_t *pipe_);
virtual void xwrite_activated (pipe_t *pipe_);
virtual void xhiccuped (pipe_t *pipe_);
virtual void xterminated (pipe_t *pipe_) = 0;
// Delay actual destruction of the socket.
void process_destroy ();
private:
// To be called after processing commands or invoking any command
// handlers explicitly. If required, it will deallocate the socket.
void check_destroy ();
// Moves the flags from the message to local variables,
// to be later retrieved by getsockopt.
void extract_flags (msg_t *msg_);
// Used to check whether the object is a socket.
uint32_t tag;
// If true, associated context was already terminated.
bool ctx_terminated;
// If true, object should have been already destroyed. However,
// destruction is delayed while we unwind the stack to the point
// where it doesn't intersect the object being destroyed.
bool destroyed;
// Parse URI string.
int parse_uri (const char *uri_, std::string &protocol_,
std::string &address_);
// Check whether transport protocol, as specified in connect or
// bind, is available and compatible with the socket type.
int check_protocol (const std::string &protocol_);
// Register the pipe with this socket.
void attach_pipe (xs::pipe_t *pipe_);
// Processes commands sent to this socket (if any). If timeout is -1,
// returns only after at least one command was processed.
// If throttle argument is true, commands are processed at most once
// in a predefined time period.
int process_commands (int timeout_, bool throttle_);
// Handlers for incoming commands.
void process_stop ();
void process_bind (xs::pipe_t *pipe_);
void process_unplug ();
void process_term (int linger_);
// Socket's mailbox object.
mailbox_t mailbox;
// List of attached pipes.
typedef array_t <pipe_t, 3> pipes_t;
pipes_t pipes;
// Reaper's poller and handle of this socket within it.
poller_t *poller;
handle_t handle;
// Timestamp of when commands were processed the last time.
uint64_t last_tsc;
// Number of messages received since last command processing.
int ticks;
// True if the last message received had MORE flag set.
bool rcvmore;
socket_base_t (const socket_base_t&);
const socket_base_t &operator = (const socket_base_t&);
};
}
#endif
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