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/*
* cache-null.c: dummy caching object for Subversion
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#include "svn_private_config.h"
#include "cache.h"
/* There is no dedicated cache data structure. Instead, we store the
* cache ID directly in svn_cache__t.cache_internal .
*/
static svn_error_t *
null_cache_get(void **value_p,
svn_boolean_t *found,
void *cache_void,
const void *key,
apr_pool_t *result_pool)
{
/* We know there is nothing to be found in this cache. */
*value_p = NULL;
*found = FALSE;
return SVN_NO_ERROR;
}
static svn_error_t *
null_cache_has_key(svn_boolean_t *found,
void *cache_void,
const void *key,
apr_pool_t *scratch_pool)
{
/* We know there is nothing to be found in this cache. */
*found = FALSE;
return SVN_NO_ERROR;
}
static svn_error_t *
null_cache_set(void *cache_void,
const void *key,
void *value,
apr_pool_t *scratch_pool)
{
/* We won't cache anything. */
return SVN_NO_ERROR;
}
static svn_error_t *
null_cache_iter(svn_boolean_t *completed,
void *cache_void,
svn_iter_apr_hash_cb_t user_cb,
void *user_baton,
apr_pool_t *scratch_pool)
{
/* Iteration over an empty set is a no-op. */
if (completed)
*completed = TRUE;
return SVN_NO_ERROR;
}
static svn_error_t *
null_cache_get_partial(void **value_p,
svn_boolean_t *found,
void *cache_void,
const void *key,
svn_cache__partial_getter_func_t func,
void *baton,
apr_pool_t *result_pool)
{
/* We know there is nothing to be found in this cache. */
*found = FALSE;
return SVN_NO_ERROR;
}
static svn_error_t *
null_cache_set_partial(void *cache_void,
const void *key,
svn_cache__partial_setter_func_t func,
void *baton,
apr_pool_t *scratch_pool)
{
/* We know there is nothing to update in this cache. */
return SVN_NO_ERROR;
}
static svn_boolean_t
null_cache_is_cachable(void *cache_void,
apr_size_t size)
{
/* We won't cache anything */
return FALSE;
}
static svn_error_t *
null_cache_get_info(void *cache_void,
svn_cache__info_t *info,
svn_boolean_t reset,
apr_pool_t *result_pool)
{
const char *id = cache_void;
info->id = apr_pstrdup(result_pool, id);
info->used_entries = 0;
info->total_entries = 0;
info->used_size = 0;
info->data_size = 0;
info->total_size = 0;
return SVN_NO_ERROR;
}
static svn_cache__vtable_t null_cache_vtable = {
null_cache_get,
null_cache_has_key,
null_cache_set,
null_cache_iter,
null_cache_is_cachable,
null_cache_get_partial,
null_cache_set_partial,
null_cache_get_info
};
svn_error_t *
svn_cache__create_null(svn_cache__t **cache_p,
const char *id,
apr_pool_t *result_pool)
{
svn_cache__t *cache = apr_pcalloc(result_pool, sizeof(*cache));
cache->vtable = &null_cache_vtable;
cache->cache_internal = apr_pstrdup(result_pool, id);
cache->pretend_empty = FALSE; /* There is no point in pretending --
this cache _is_ empty. */
*cache_p = cache;
return SVN_NO_ERROR;
}
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