120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* $Id$
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*/
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#include "database_factory.h"
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#include <utils/linked_list.h>
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#include <utils/mutex.h>
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typedef struct private_database_factory_t private_database_factory_t;
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/**
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* private data of database_factory
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*/
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struct private_database_factory_t {
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/**
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* public functions
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*/
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database_factory_t public;
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/**
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* list of registered database_t implementations
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*/
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linked_list_t *databases;
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/**
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* mutex to lock access to databases
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*/
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mutex_t *mutex;
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};
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/**
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* Implementation of database_factory_t.create.
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*/
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static database_t* create(private_database_factory_t *this, char *uri)
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{
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enumerator_t *enumerator;
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database_t *database = NULL;
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database_constructor_t create;
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this->mutex->lock(this->mutex);
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enumerator = this->databases->create_enumerator(this->databases);
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while (enumerator->enumerate(enumerator, &create))
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{
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database = create(uri);
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if (database)
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{
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->mutex->unlock(this->mutex);
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return database;
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}
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/**
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* Implementation of database_factory_t.add_database.
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*/
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static void add_database(private_database_factory_t *this,
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database_constructor_t create)
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{
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this->mutex->lock(this->mutex);
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this->databases->insert_last(this->databases, create);
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this->mutex->unlock(this->mutex);
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}
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/**
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* Implementation of database_factory_t.remove_database.
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*/
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static void remove_database(private_database_factory_t *this,
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database_constructor_t create)
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{
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this->mutex->lock(this->mutex);
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this->databases->remove(this->databases, create, NULL);
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this->mutex->unlock(this->mutex);
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}
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/**
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* Implementation of database_factory_t.destroy
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*/
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static void destroy(private_database_factory_t *this)
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{
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this->databases->destroy(this->databases);
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this->mutex->destroy(this->mutex);
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free(this);
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}
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/*
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* see header file
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*/
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database_factory_t *database_factory_create()
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{
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private_database_factory_t *this = malloc_thing(private_database_factory_t);
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this->public.create = (database_t*(*)(database_factory_t*, char *url))create;
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this->public.add_database = (void(*)(database_factory_t*, database_constructor_t))add_database;
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this->public.remove_database = (void(*)(database_factory_t*, database_constructor_t))remove_database;
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this->public.destroy = (void(*)(database_factory_t*))destroy;
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this->databases = linked_list_create();
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this->mutex = mutex_create(MUTEX_DEFAULT);
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return &this->public;
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}
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