jk_objcache.c

Tomcat 4.1与WebServer集成组件的源代码包.

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 *                 The Apache Software License,  Version 1.1                 *
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 * ========================================================================= *
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 * Redistribution and use in source and binary forms,  with or without modi- *
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 * 1. Redistributions of source code  must retain the above copyright notice *
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 * 2. Redistributions  in binary  form  must  reproduce the  above copyright *
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 * 3. The end-user documentation  included with the redistribution,  if any, *
 *    must include the following acknowlegement:                             *
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 *       "This product includes  software developed  by the Apache  Software *
 *        Foundation <http://www.apache.org/>."                              *
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 * 4. The names  "The  Jakarta  Project",  "Jk",  and  "Apache  Software     *
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 * INCLUDING, BUT NOT LIMITED TO,  THE IMPLIED WARRANTIES OF MERCHANTABILITY *
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 * POSSIBILITY OF SUCH DAMAGE.                                               *
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 * This software  consists of voluntary  contributions made  by many indivi- *
 * duals on behalf of the  Apache Software Foundation.  For more information *
 * on the Apache Software Foundation, please see <http://www.apache.org/>.   *
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/* See jk_objCache.h for docs */

#include "jk_global.h"
#include "jk_pool.h"
#include "jk_logger.h"
#include "jk_env.h"

#include "jk_objCache.h"

static int 
jk2_objCache_put(jk_env_t *env, jk_objCache_t *_this, void *obj)
{
    int rc;
    
    if(_this->size <= 0 )
        return JK_ERR;

    if( _this->cs != NULL )
        _this->cs->lock(env, _this->cs );

    rc=JK_FALSE;
    
    if( _this->count >= _this->size && _this->maxSize== -1 ) {
        /* Realloc */
        void **oldData=_this->data;
        _this->data =
            (void **)_this->pool->calloc(env, _this->pool,
                                         2 * sizeof(void *) * _this->size);
        memcpy( _this->data, oldData, _this->size );
        _this->size *= 2;
        /* XXX Can we destroy the old data ? Probably not.
           It may be better to have a list - but it's unlikely
           we'll have too many reallocations */
    }
    
    if( _this->count < _this->size ) {
        _this->data[_this->count++]=obj;
    }
    
    if( _this->cs != NULL )
        _this->cs->unLock(env, _this->cs );

    return JK_OK;
}

static int
jk2_objCache_init(jk_env_t *env, jk_objCache_t *_this, int cacheSize ) {
    jk_bean_t *jkb;
    
    if( cacheSize <= 0 ) {
        _this->size= 64;
    } else {
        _this->size= cacheSize ;
    }
    _this->count=0;
    _this->maxSize=cacheSize;
    
    _this->data =
        (void **)_this->pool->calloc(env, _this->pool,
                                     sizeof(void *) * _this->size);

    if( _this->data==NULL )
        return JK_ERR;
    
    jkb=env->createBean2(env, _this->pool,"threadMutex", NULL);
    if( jkb != NULL ) {
        _this->cs=jkb->object;
        jkb->init(env, jkb );
    }

    return JK_OK;
}

static int  
jk2_objCache_destroy(jk_env_t *env, jk_objCache_t *_this ) {

    if( _this->cs != NULL ) 
        _this->cs->mbean->destroy( env, _this->cs->mbean );

    _this->count=0;
    /* Nothing to free, we use pools */

    return JK_OK;
}


static void * 
jk2_objCache_get(jk_env_t *env, jk_objCache_t *_this )
{
    void *ae=NULL;

    if( _this->cs != NULL )
        _this->cs->lock(env, _this->cs );

    if( _this->count > 0 ) {
        _this->count--;
        ae=_this->data[ _this->count ];
    }

    if( _this->cs != NULL )
        _this->cs->unLock(env, _this->cs );

    return ae;
}

jk_objCache_t *jk2_objCache_create(jk_env_t *env, jk_pool_t *pool ) {
    jk_objCache_t *_this=pool->calloc( env, pool, sizeof( jk_objCache_t ));

    _this->pool=pool;

    _this->count=0;
    _this->size=0;
    _this->maxSize=-1;
    
    _this->get=jk2_objCache_get;
    _this->put=jk2_objCache_put;
    _this->init=jk2_objCache_init;
    _this->destroy=jk2_objCache_destroy;
    
    return _this;
}