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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O 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_OWN_HPP_INCLUDED__
#define __XS_OWN_HPP_INCLUDED__
#include <set>
#include <algorithm>
#include "object.hpp"
#include "options.hpp"
#include "atomic_counter.hpp"
#include "stdint.hpp"
namespace xs
{
class ctx_t;
class io_thread_t;
// Base class for objects forming a part of ownership hierarchy.
// It handles initialisation and destruction of such objects.
class own_t : public object_t
{
public:
// Note that the owner is unspecified in the constructor.
// It'll be supplied later on when the object is plugged in.
// The object is not living within an I/O thread. It has it's own
// thread outside of Crossroads infrastructure.
own_t (xs::ctx_t *parent_, uint32_t tid_);
// The object is living within I/O thread.
own_t (xs::io_thread_t *io_thread_, const options_t &options_);
// When another owned object wants to send command to this object
// it calls this function to let it know it should not shut down
// before the command is delivered.
void inc_seqnum ();
// Use following two functions to wait for arbitrary events before
// terminating. Just add number of events to wait for using
// register_tem_acks functions. When event occurs, call
// remove_term_ack. When number of pending acks reaches zero
// object will be deallocated.
void register_term_acks (int count_);
void unregister_term_ack ();
protected:
// Handlers for incoming commands.
void process_term_req (own_t *object_);
void process_term_ack ();
void process_seqnum ();
// Launch the supplied object and become its owner.
void launch_child (own_t *object_);
// Ask owner object to terminate this object. It may take a while
// while actual termination is started. This function should not be
// called more than once.
void terminate ();
// Returns true if the object is in process of termination.
bool is_terminating ();
// Derived object destroys own_t. There's no point in allowing
// others to invoke the destructor. At the same time, it has to be
// virtual so that generic own_t deallocation mechanism destroys
// specific type of the owned object correctly.
virtual ~own_t ();
// Term handler is protocted rather than private so that it can
// be intercepted by the derived class. This is useful to add custom
// steps to the beginning of the termination process.
void process_term (int linger_);
// A place to hook in when phyicallal destruction of the object
// is to be delayed.
virtual void process_destroy ();
// Socket options associated with this object.
options_t options;
private:
// Set owner of the object
void set_owner (own_t *owner_);
// Check whether all the peding term acks were delivered.
// If so, deallocate this object.
void check_term_acks ();
// True if termination was already initiated. If so, we can destroy
// the object if there are no more child objects or pending term acks.
bool terminating;
// Sequence number of the last command sent to this object.
atomic_counter_t sent_seqnum;
// Sequence number of the last command processed by this object.
uint64_t processed_seqnum;
// Socket owning this object. It's responsible for shutting down
// this object.
own_t *owner;
// List of all objects owned by this socket. We are responsible
// for deallocating them before we quit.
typedef std::set <own_t*> owned_t;
owned_t owned;
// Number of events we have to get before we can destroy the object.
int term_acks;
own_t (const own_t&);
const own_t &operator = (const own_t&);
};
}
#endif
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