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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*
* $Id$
*/
#include "attribute_manager.h"
#include <utils/linked_list.h>
#include <utils/mutex.h>
typedef struct private_attribute_manager_t private_attribute_manager_t;
/**
* private data of attribute_manager
*/
struct private_attribute_manager_t {
/**
* public functions
*/
attribute_manager_t public;
/**
* list of registered providers
*/
linked_list_t *providers;
/**
* rwlock provider list
*/
rwlock_t *lock;
};
/**
* Implementation of attribute_manager_t.acquire_address.
*/
static host_t* acquire_address(private_attribute_manager_t *this,
char *pool, identification_t *id,
auth_info_t *auth, host_t *requested)
{
enumerator_t *enumerator;
attribute_provider_t *current;
host_t *host = NULL;
this->lock->read_lock(this->lock);
enumerator = this->providers->create_enumerator(this->providers);
while (enumerator->enumerate(enumerator, ¤t))
{
host = current->acquire_address(current, pool, id, auth, requested);
if (host)
{
break;
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
return host;
}
/**
* Implementation of attribute_manager_t.release_address.
*/
static void release_address(private_attribute_manager_t *this,
char *pool, host_t *address, identification_t *id)
{
enumerator_t *enumerator;
attribute_provider_t *current;
this->lock->read_lock(this->lock);
enumerator = this->providers->create_enumerator(this->providers);
while (enumerator->enumerate(enumerator, ¤t))
{
if (current->release_address(current, pool, address, id))
{
break;
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
}
/**
* Implementation of attribute_manager_t.add_provider.
*/
static void add_provider(private_attribute_manager_t *this,
attribute_provider_t *provider)
{
this->lock->write_lock(this->lock);
this->providers->insert_last(this->providers, provider);
this->lock->unlock(this->lock);
}
/**
* Implementation of attribute_manager_t.remove_provider.
*/
static void remove_provider(private_attribute_manager_t *this,
attribute_provider_t *provider)
{
this->lock->write_lock(this->lock);
this->providers->remove(this->providers, provider, NULL);
this->lock->unlock(this->lock);
}
/**
* Implementation of attribute_manager_t.destroy
*/
static void destroy(private_attribute_manager_t *this)
{
this->providers->destroy(this->providers);
this->lock->destroy(this->lock);
free(this);
}
/*
* see header file
*/
attribute_manager_t *attribute_manager_create()
{
private_attribute_manager_t *this = malloc_thing(private_attribute_manager_t);
this->public.acquire_address = (host_t*(*)(attribute_manager_t*, char*, identification_t*,auth_info_t*,host_t*))acquire_address;
this->public.release_address = (void(*)(attribute_manager_t*, char *, host_t*, identification_t*))release_address;
this->public.add_provider = (void(*)(attribute_manager_t*, attribute_provider_t *provider))add_provider;
this->public.remove_provider = (void(*)(attribute_manager_t*, attribute_provider_t *provider))remove_provider;
this->public.destroy = (void(*)(attribute_manager_t*))destroy;
this->providers = linked_list_create();
this->lock = rwlock_create(RWLOCK_DEFAULT);
return &this->public;
}
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