146 lines
3.8 KiB
C
146 lines
3.8 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 "attribute_manager.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_attribute_manager_t private_attribute_manager_t;
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/**
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* private data of attribute_manager
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*/
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struct private_attribute_manager_t {
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/**
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* public functions
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*/
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attribute_manager_t public;
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/**
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* list of registered providers
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*/
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linked_list_t *providers;
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/**
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* rwlock provider list
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*/
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rwlock_t *lock;
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};
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/**
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* Implementation of attribute_manager_t.acquire_address.
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*/
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static host_t* acquire_address(private_attribute_manager_t *this,
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char *pool, identification_t *id,
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auth_info_t *auth, host_t *requested)
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{
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enumerator_t *enumerator;
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attribute_provider_t *current;
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host_t *host = NULL;
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this->lock->read_lock(this->lock);
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enumerator = this->providers->create_enumerator(this->providers);
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while (enumerator->enumerate(enumerator, ¤t))
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{
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host = current->acquire_address(current, pool, id, auth, requested);
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if (host)
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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->lock->unlock(this->lock);
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return host;
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}
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/**
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* Implementation of attribute_manager_t.release_address.
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*/
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static void release_address(private_attribute_manager_t *this,
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char *pool, host_t *address, identification_t *id)
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{
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enumerator_t *enumerator;
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attribute_provider_t *current;
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this->lock->read_lock(this->lock);
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enumerator = this->providers->create_enumerator(this->providers);
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while (enumerator->enumerate(enumerator, ¤t))
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{
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if (current->release_address(current, pool, address, id))
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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->lock->unlock(this->lock);
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}
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/**
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* Implementation of attribute_manager_t.add_provider.
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*/
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static void add_provider(private_attribute_manager_t *this,
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attribute_provider_t *provider)
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{
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this->lock->write_lock(this->lock);
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this->providers->insert_last(this->providers, provider);
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this->lock->unlock(this->lock);
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}
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/**
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* Implementation of attribute_manager_t.remove_provider.
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*/
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static void remove_provider(private_attribute_manager_t *this,
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attribute_provider_t *provider)
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{
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this->lock->write_lock(this->lock);
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this->providers->remove(this->providers, provider, NULL);
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this->lock->unlock(this->lock);
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}
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/**
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* Implementation of attribute_manager_t.destroy
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*/
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static void destroy(private_attribute_manager_t *this)
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{
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this->providers->destroy(this->providers);
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this->lock->destroy(this->lock);
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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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attribute_manager_t *attribute_manager_create()
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{
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private_attribute_manager_t *this = malloc_thing(private_attribute_manager_t);
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this->public.acquire_address = (host_t*(*)(attribute_manager_t*, char*, identification_t*,auth_info_t*,host_t*))acquire_address;
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this->public.release_address = (void(*)(attribute_manager_t*, char *, host_t*, identification_t*))release_address;
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this->public.add_provider = (void(*)(attribute_manager_t*, attribute_provider_t *provider))add_provider;
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this->public.remove_provider = (void(*)(attribute_manager_t*, attribute_provider_t *provider))remove_provider;
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this->public.destroy = (void(*)(attribute_manager_t*))destroy;
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this->providers = linked_list_create();
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this->lock = rwlock_create(RWLOCK_DEFAULT);
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return &this->public;
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}
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