Tomcat example source code file (pool.c)

This example Tomcat source code file (pool.c) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

apr_success, j2p, j2p, j2s, null, null, p2j, pool, pool, tcn_assert, tcn_implement_call, tcn_implement_call, unreferenced, unreferenced_stdargs

The Tomcat pool.c source code

/* 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.
 */

/*
 *
 * @author Mladen Turk
 * @version $Revision: 466585 $, $Date: 2006-10-22 00:16:34 +0200 (dim., 22 oct. 2006) $
 */

#include "tcn.h"

extern apr_pool_t *tcn_global_pool;

static apr_status_t generic_pool_cleanup(void *data)
{
    apr_status_t rv = APR_SUCCESS;
    tcn_callback_t *cb = (tcn_callback_t *)data;

    if (data) {
        JNIEnv *env;
        tcn_get_java_env(&env);
        if (!TCN_IS_NULL(env, cb->obj)) {
            rv = (*(env))->CallIntMethod(env, cb->obj, cb->mid[0],
                                         NULL);
            TCN_UNLOAD_CLASS(env, cb->obj);
        }
        free(cb);
    }
    return rv;
}

TCN_IMPLEMENT_CALL(jlong, Pool, create)(TCN_STDARGS, jlong parent)
{
    apr_pool_t *p = J2P(parent, apr_pool_t *);
    apr_pool_t *n;

    UNREFERENCED(o);
    /* Make sure our global pool is accessor for all pools */
    if (p == NULL)
        p = tcn_global_pool;
    TCN_THROW_IF_ERR(apr_pool_create(&n, p), n);
cleanup:
    return P2J(n);
}

TCN_IMPLEMENT_CALL(void, Pool, clear)(TCN_STDARGS, jlong pool)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    UNREFERENCED_STDARGS;
    TCN_ASSERT(pool != 0);
    apr_pool_clear(p);
}

TCN_IMPLEMENT_CALL(void, Pool, destroy)(TCN_STDARGS, jlong pool)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    UNREFERENCED_STDARGS;
    TCN_ASSERT(pool != 0);
    apr_pool_destroy(p);
}

TCN_IMPLEMENT_CALL(jlong, Pool, parentGet)(TCN_STDARGS, jlong pool)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    UNREFERENCED_STDARGS;
    TCN_ASSERT(pool != 0);
    return P2J(apr_pool_parent_get(p));
}

TCN_IMPLEMENT_CALL(jboolean, Pool, isAncestor)(TCN_STDARGS, jlong a, jlong b)
{
    apr_pool_t *pa = J2P(a, apr_pool_t *);
    apr_pool_t *pb = J2P(b, apr_pool_t *);
    UNREFERENCED_STDARGS;
    return apr_pool_is_ancestor(pa, pb) ? JNI_TRUE : JNI_FALSE;
}

TCN_IMPLEMENT_CALL(jlong, Pool, palloc)(TCN_STDARGS, jlong pool, jint size)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    UNREFERENCED_STDARGS;
    return P2J(apr_palloc(p, (apr_size_t)size));
}

TCN_IMPLEMENT_CALL(jlong, Pool, pcalloc)(TCN_STDARGS, jlong pool, jint size)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    UNREFERENCED_STDARGS;
    return P2J(apr_pcalloc(p, (apr_size_t)size));
}

TCN_IMPLEMENT_CALL(jlong, Pool, cleanupRegister)(TCN_STDARGS, jlong pool,
                                                 jobject obj)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    tcn_callback_t *cb = (tcn_callback_t *)malloc(sizeof(tcn_callback_t));
    jclass cls;

    UNREFERENCED(o);

    if (cb == NULL) {
       TCN_THROW_OS_ERROR(e);
       return 0;
    }
    cls = (*e)->GetObjectClass(e, obj);
    cb->obj    = (*e)->NewGlobalRef(e, obj);
    cb->mid[0] = (*e)->GetMethodID(e, cls, "callback", "()I");

    apr_pool_cleanup_register(p, (const void *)cb,
                              generic_pool_cleanup,
                              apr_pool_cleanup_null);

    return P2J(cb);
}

TCN_IMPLEMENT_CALL(void, Pool, cleanupKill)(TCN_STDARGS, jlong pool,
                                            jlong data)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    tcn_callback_t *cb = J2P(data, tcn_callback_t *);

    UNREFERENCED(o);
    TCN_ASSERT(pool != 0);
    apr_pool_cleanup_kill(p, cb, generic_pool_cleanup);
    (*e)->DeleteGlobalRef(e, cb->obj);
    free(cb);
}

TCN_IMPLEMENT_CALL(jobject, Pool, alloc)(TCN_STDARGS, jlong pool,
                                         jint size)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    apr_size_t sz = (apr_size_t)size;
    void *mem;

    UNREFERENCED(o);
    TCN_ASSERT(pool != 0);

    if ((mem = apr_palloc(p, sz)) != NULL)
        return (*e)->NewDirectByteBuffer(e, mem, (jlong)sz);
    else
        return NULL;
}

TCN_IMPLEMENT_CALL(jobject, Pool, calloc)(TCN_STDARGS, jlong pool,
                                          jint size)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    apr_size_t sz = (apr_size_t)size;
    void *mem;

    UNREFERENCED(o);
    TCN_ASSERT(pool != 0);

    if ((mem = apr_pcalloc(p, sz)) != NULL)
        return (*e)->NewDirectByteBuffer(e, mem, (jlong)sz);
    else
        return NULL;
}

static apr_status_t generic_pool_data_cleanup(void *data)
{
    apr_status_t rv = APR_SUCCESS;
    tcn_callback_t *cb = (tcn_callback_t *)data;

    if (data) {
        JNIEnv *env;
        tcn_get_java_env(&env);
        
        if (!TCN_IS_NULL(env, cb->obj)) {
            TCN_UNLOAD_CLASS(env, cb->obj);
        }
        free(cb);
    }
    return rv;
}

TCN_IMPLEMENT_CALL(jint, Pool, dataSet)(TCN_STDARGS, jlong pool,
                                        jstring key, jobject data)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    apr_status_t rv = APR_SUCCESS;
    void *old = NULL;
    TCN_ALLOC_CSTRING(key);

    UNREFERENCED(o);
    TCN_ASSERT(pool != 0);

    if (apr_pool_userdata_get(&old, J2S(key), p) == APR_SUCCESS) {
        if (old)
            apr_pool_cleanup_run(p, old, generic_pool_data_cleanup);
    }
    if (data) {
        JNIEnv *e;        
        tcn_callback_t *cb = (tcn_callback_t *)malloc(sizeof(tcn_callback_t));
        tcn_get_java_env(&e);
        cb->obj = (*e)->NewGlobalRef(e, data);
        if ((rv = apr_pool_userdata_set(cb, J2S(key), generic_pool_data_cleanup,
                                        p)) != APR_SUCCESS) {
            (*e)->DeleteGlobalRef(e, cb->obj);
            free(cb);
        }
    }
    else {
        /* Clear the exiting user data */
        rv = apr_pool_userdata_set(NULL, J2S(key), NULL, p);
    }
    TCN_FREE_CSTRING(key);
    return rv;
}

TCN_IMPLEMENT_CALL(jobject, Pool, dataGet)(TCN_STDARGS, jlong pool,
                                           jstring key)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    void *old = NULL;
    TCN_ALLOC_CSTRING(key);
    jobject rv = NULL;

    UNREFERENCED(o);
    TCN_ASSERT(pool != 0);

    if (apr_pool_userdata_get(&old, J2S(key), p) == APR_SUCCESS) {
        if (old) {
            tcn_callback_t *cb = (tcn_callback_t *)old;
            rv = cb->obj;
        }
    }
    TCN_FREE_CSTRING(key);
    return rv;
}

TCN_IMPLEMENT_CALL(void, Pool, cleanupForExec)(TCN_STDARGS)
{
    UNREFERENCED_STDARGS;
    apr_pool_cleanup_for_exec();
}