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/*
Copyright (c) 2011-2012 250bpm s.r.o.
Copyright (c) 2011-2012 Spotify AB
Copyright (c) 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_MTRIE_HPP_INCLUDED__
#define __XS_MTRIE_HPP_INCLUDED__
#include <stddef.h>
#include <set>
#include "stdint.hpp"
namespace xs
{
class pipe_t;
// Multi-trie. Each node in the trie is a set of pointers to pipes.
class mtrie_t
{
public:
mtrie_t ();
~mtrie_t ();
// Add key to the trie. Returns true if it's a new subscription
// rather than a duplicate.
bool add (unsigned char *prefix_, size_t size_, xs::pipe_t *pipe_);
// Remove all subscriptions for a specific peer from the trie.
// If there are no subscriptions left on some topics, invoke the
// supplied callback function.
void rm (xs::pipe_t *pipe_,
void (*func_) (unsigned char *data_, size_t size_, void *arg_),
void *arg_);
// Remove specific subscription from the trie. Return true is it was
// actually removed rather than de-duplicated.
bool rm (unsigned char *prefix_, size_t size_, xs::pipe_t *pipe_);
// Signal all the matching pipes.
void match (unsigned char *data_, size_t size_,
void (*func_) (xs::pipe_t *pipe_, void *arg_), void *arg_);
private:
bool add_helper (unsigned char *prefix_, size_t size_,
xs::pipe_t *pipe_);
void rm_helper (xs::pipe_t *pipe_, unsigned char **buff_,
size_t buffsize_, size_t maxbuffsize_,
void (*func_) (unsigned char *data_, size_t size_, void *arg_),
void *arg_);
bool rm_helper (unsigned char *prefix_, size_t size_,
xs::pipe_t *pipe_);
bool is_redundant () const;
typedef std::set <xs::pipe_t*> pipes_t;
pipes_t *pipes;
unsigned char min;
unsigned short count;
unsigned short live_nodes;
union {
class mtrie_t *node;
class mtrie_t **table;
} next;
mtrie_t (const mtrie_t&);
const mtrie_t &operator = (const mtrie_t&);
};
}
#endif
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