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/******************************************************************************
*
* Project: MapServer
* Purpose: MapCache tile caching: composite 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 compositeriction, 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 mapcache_cache_composite_cache_link* _mapcache_cache_link_create(apr_pool_t *pool) {
mapcache_cache_composite_cache_link *cl = apr_pcalloc(pool, sizeof(mapcache_cache_composite_cache_link));
cl->cache=NULL;
cl->dimensions=NULL;
cl->grids=NULL;
cl->maxzoom=-1;
cl->minzoom=-1;
return cl;
}
/**
* returns the mapcache_cache to use for a given tile
* @param ctx
* @param tile
* @return
*/
static mapcache_cache* _mapcache_composite_cache_get(mapcache_context *ctx, mapcache_cache_composite *cache, mapcache_tile *tile) {
int i;
for(i=0; i<cache->cache_links->nelts; i++) {
mapcache_cache_composite_cache_link *cache_link = APR_ARRAY_IDX(cache->cache_links,i,mapcache_cache_composite_cache_link*);
if(cache_link->minzoom != -1 && tile->z < cache_link->minzoom) continue;
if(cache_link->maxzoom != -1 && tile->z > cache_link->maxzoom) continue;
if(cache_link->grids) {
int j;
for(j=0;j<cache_link->grids->nelts;j++) {
char *grid_name = APR_ARRAY_IDX(cache_link->grids,j,char*);
if(!strcmp(tile->grid_link->grid->name,grid_name))
break;
}
/* not found */
if(j == cache_link->grids->nelts) continue;
}
return cache_link->cache;
}
ctx->set_error(ctx, 500, "no cache matches for given tile request");
return NULL;
}
static int _mapcache_cache_composite_tile_exists(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
mapcache_cache *subcache;
subcache = _mapcache_composite_cache_get(ctx, cache, tile);
if(GC_HAS_ERROR(ctx) || !subcache)
return MAPCACHE_FAILURE;
return subcache->tile_exists(ctx, subcache, tile);
}
static void _mapcache_cache_composite_tile_delete(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
mapcache_cache *subcache;
subcache = _mapcache_composite_cache_get(ctx, cache, tile);
GC_CHECK_ERROR(ctx);
/*delete the tile itself*/
subcache->tile_delete(ctx,subcache,tile);
}
/**
* \brief get content of given tile
*
* fills the mapcache_tile::data of the given tile with content stored on the composite server
* \private \memberof mapcache_cache_composite
* \sa mapcache_cache::tile_get()
*/
static int _mapcache_cache_composite_tile_get(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
mapcache_cache *subcache;
subcache = _mapcache_composite_cache_get(ctx, cache, tile);
GC_CHECK_ERROR_RETURN(ctx);
return subcache->tile_get(ctx,subcache,tile);
}
static void _mapcache_cache_composite_tile_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
mapcache_cache *subcache;
subcache = _mapcache_composite_cache_get(ctx, cache, tile);
GC_CHECK_ERROR(ctx);
return subcache->tile_set(ctx,subcache,tile);
}
static void _mapcache_cache_composite_tile_multi_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tiles, int ntiles)
{
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
mapcache_cache *subcache;
subcache = _mapcache_composite_cache_get(ctx, cache, &tiles[0]);
GC_CHECK_ERROR(ctx);
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]);
}
}
}
/**
* \private \memberof mapcache_cache_composite
*/
static void _mapcache_cache_composite_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_cache *pcache, mapcache_cfg *config)
{
ezxml_t cur_node;
mapcache_cache_composite *cache = (mapcache_cache_composite*)pcache;
cache->cache_links = apr_array_make(ctx->pool,3,sizeof(mapcache_cache_composite_cache_link*));
for(cur_node = ezxml_child(node,"cache"); cur_node; cur_node = cur_node->next) {
char *sZoom;
int zoom;
mapcache_cache *refcache = mapcache_configuration_get_cache(config, cur_node->txt);
mapcache_cache_composite_cache_link *cachelink;
if(!refcache) {
ctx->set_error(ctx, 400, "composite cache \"%s\" references cache \"%s\","
" but it is not configured (hint:referenced caches must be declared before this composite cache in the xml file)", pcache->name, cur_node->txt);
return;
}
cachelink = _mapcache_cache_link_create(ctx->pool);
cachelink->cache = refcache;
sZoom = (char*)ezxml_attr(cur_node,"max-zoom");
if(sZoom) {
char *endptr;
zoom = (int)strtol(sZoom,&endptr,10);
if(*endptr != 0 || zoom < 0) {
ctx->set_error(ctx, 400, "failed to parse cache max-zoom %s (expecting a positive integer)",
sZoom);
return;
}
cachelink->maxzoom = zoom;
}
sZoom = (char*)ezxml_attr(cur_node,"min-zoom");
if(sZoom) {
char *endptr;
zoom = (int)strtol(sZoom,&endptr,10);
if(*endptr != 0 || zoom < 0) {
ctx->set_error(ctx, 400, "failed to parse cache min-zoom %s (expecting a positive integer)",
sZoom);
return;
}
cachelink->minzoom = zoom;
}
APR_ARRAY_PUSH(cache->cache_links,mapcache_cache_composite_cache_link*) = cachelink;
}
}
/**
* \private \memberof mapcache_cache_composite
*/
static void _mapcache_cache_composite_configuration_post_config(mapcache_context *ctx, mapcache_cache *cache,
mapcache_cfg *cfg)
{
}
/**
* \brief creates and initializes a mapcache_cache_composite
*/
mapcache_cache* mapcache_cache_composite_create(mapcache_context *ctx)
{
mapcache_cache_composite *cache = apr_pcalloc(ctx->pool,sizeof(mapcache_cache_composite));
if(!cache) {
ctx->set_error(ctx, 500, "failed to allocate composite cache");
return NULL;
}
cache->cache.metadata = apr_table_make(ctx->pool,3);
cache->cache.type = MAPCACHE_CACHE_COMPOSITE;
cache->cache.tile_delete = _mapcache_cache_composite_tile_delete;
cache->cache.tile_get = _mapcache_cache_composite_tile_get;
cache->cache.tile_exists = _mapcache_cache_composite_tile_exists;
cache->cache.tile_set = _mapcache_cache_composite_tile_set;
cache->cache.tile_multi_set = _mapcache_cache_composite_tile_multi_set;
cache->cache.configuration_post_config = _mapcache_cache_composite_configuration_post_config;
cache->cache.configuration_parse_xml = _mapcache_cache_composite_configuration_parse_xml;
return (mapcache_cache*)cache;
}
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