apr_optional_hooks.h

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/* 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.
 */
#ifndef APR_OPTIONAL_HOOK_H
#define APR_OPTIONAL_HOOK_H

#include "apr_tables.h"

#ifdef __cplusplus
extern "C" {
#endif

APU_DECLARE(void) apr_optional_hook_add(const char *szName,void (*pfn)(void),
                    const char * const *aszPre,
                    const char * const *aszSucc,
                    int nOrder);

#define APR_OPTIONAL_HOOK(ns,name,pfn,aszPre,aszSucc,nOrder) do { \
  ns##_HOOK_##name##_t *apu__hook = pfn; \
  apr_optional_hook_add(#name,(void (*)(void))apu__hook,aszPre, aszSucc, nOrder); \
} while (0)

APU_DECLARE(apr_array_header_t *) apr_optional_hook_get(const char *szName);

#define APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ns,link,ret,name,args_decl,args_use,ok,decline) \
link##_DECLARE(ret) ns##_run_##name args_decl \
    { \
    ns##_LINK_##name##_t *pHook; \
    int n; \
    ret rv; \
    apr_array_header_t *pHookArray=apr_optional_hook_get(#name); \
\
    if(!pHookArray) \
    return ok; \
\
    pHook=(ns##_LINK_##name##_t *)pHookArray->elts; \
    for(n=0 ; n < pHookArray->nelts ; ++n) \
    { \
    rv=(pHook[n].pFunc)args_use; \
\
    if(rv != ok && rv != decline) \
        return rv; \
    } \
    return ok; \
    }

#ifdef __cplusplus
}
#endif

#endif /* APR_OPTIONAL_HOOK_H */