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/******************************************************************************
*
* Project: MapServer
* Purpose: MapCache tile caching: multitier cache backend.
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2011 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without multitierriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "mapcache.h"
static int _mapcache_cache_multitier_tile_exists(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
int i;
for(i=0; i<cache->caches->nelts; i++) {
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
if(subcache->tile_exists(ctx, subcache, tile) == MAPCACHE_TRUE) {
return MAPCACHE_TRUE;
}
}
return MAPCACHE_FALSE;
}
static void _mapcache_cache_multitier_tile_delete(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
int i;
for(i=0; i<cache->caches->nelts; i++) {
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
subcache->tile_delete(ctx, subcache, tile);
ctx->clear_errors(ctx); /* ignore errors */
}
}
/**
* \brief get content of given tile
*
* fills the mapcache_tile::data of the given tile with content stored on the multitier server
* \private \memberof mapcache_cache_multitier
* \sa mapcache_cache::tile_get()
*/
static int _mapcache_cache_multitier_tile_get(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
mapcache_cache *subcache;
int i,ret;
subcache = APR_ARRAY_IDX(cache->caches,0,mapcache_cache*);
ret = subcache->tile_get(ctx, subcache, tile);
if(ret == MAPCACHE_CACHE_MISS) {
for(i=1; i<cache->caches->nelts; i++) {
subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
if(subcache->tile_get(ctx, subcache, tile) == MAPCACHE_SUCCESS) {
ctx->log(ctx,MAPCACHE_DEBUG,"got tile (%s,z=%d,y=%d,x=%d) from secondary cache (%s)",tile->tileset->name, tile->z, tile->y, tile->x, subcache->name);
for(--i;i>=0;i--) {
subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
subcache->tile_set(ctx, subcache, tile);
ctx->clear_errors(ctx); /* silently ignore these errors */
ctx->log(ctx,MAPCACHE_DEBUG,"transferring tile (%s,z=%d,y=%d,x=%d) to cache (%s)",tile->tileset->name, tile->z, tile->y, tile->x, subcache->name);
}
return MAPCACHE_SUCCESS;
}
}
return MAPCACHE_CACHE_MISS;
} else {
//ctx->log(ctx,MAPCACHE_DEBUG,"got tile (%s,z=%d,y=%d,x=%d) from primary cache (%s)",tile->tileset->name, tile->z, tile->y, tile->x, subcache->name);
return ret;
}
}
static void _mapcache_cache_multitier_tile_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,cache->caches->nelts-1,mapcache_cache*);
return subcache->tile_set(ctx, subcache, tile);
}
static void _mapcache_cache_multitier_tile_multi_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tiles, int ntiles)
{
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,cache->caches->nelts-1,mapcache_cache*);
if(subcache->tile_multi_set) {
return subcache->tile_multi_set(ctx, subcache, tiles, ntiles);
} else {
int i;
for( i=0;i<ntiles;i++ ) {
subcache->tile_set(ctx, subcache, &tiles[i]);
GC_CHECK_ERROR(ctx);
}
}
}
/**
* \private \memberof mapcache_cache_multitier
*/
static void _mapcache_cache_multitier_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_cache *pcache, mapcache_cfg *config)
{
ezxml_t cur_node;
mapcache_cache_multitier *cache = (mapcache_cache_multitier*)pcache;
cache->caches = apr_array_make(ctx->pool,3,sizeof(mapcache_cache*));
for(cur_node = ezxml_child(node,"cache"); cur_node; cur_node = cur_node->next) {
mapcache_cache *refcache = mapcache_configuration_get_cache(config, cur_node->txt);
if(!refcache) {
ctx->set_error(ctx, 400, "multitier cache \"%s\" references cache \"%s\","
" but it is not configured (hint:referenced caches must be declared before this multitier cache in the xml file)", pcache->name, cur_node->txt);
return;
}
APR_ARRAY_PUSH(cache->caches,mapcache_cache*) = refcache;
}
if(cache->caches->nelts == 0) {
ctx->set_error(ctx,400,"multitier cache \"%s\" does not reference any child caches", pcache->name);
}
}
/**
* \private \memberof mapcache_cache_multitier
*/
static void _mapcache_cache_multitier_configuration_post_config(mapcache_context *ctx, mapcache_cache *cache,
mapcache_cfg *cfg)
{
}
/**
* \brief creates and initializes a mapcache_cache_multitier
*/
mapcache_cache* mapcache_cache_multitier_create(mapcache_context *ctx)
{
mapcache_cache_multitier *cache = apr_pcalloc(ctx->pool,sizeof(mapcache_cache_multitier));
if(!cache) {
ctx->set_error(ctx, 500, "failed to allocate multitier cache");
return NULL;
}
cache->cache.metadata = apr_table_make(ctx->pool,3);
cache->cache.type = MAPCACHE_CACHE_COMPOSITE;
cache->cache.tile_delete = _mapcache_cache_multitier_tile_delete;
cache->cache.tile_get = _mapcache_cache_multitier_tile_get;
cache->cache.tile_exists = _mapcache_cache_multitier_tile_exists;
cache->cache.tile_set = _mapcache_cache_multitier_tile_set;
cache->cache.tile_multi_set = _mapcache_cache_multitier_tile_multi_set;
cache->cache.configuration_post_config = _mapcache_cache_multitier_configuration_post_config;
cache->cache.configuration_parse_xml = _mapcache_cache_multitier_configuration_parse_xml;
return (mapcache_cache*)cache;
}
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