/*------------------------------------------------------------------------------
 *
 * Copyright (c) 2011-2016, EURid. All rights reserved.
 * The YADIFA TM software product is provided under the BSD 3-clause license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *        * Redistributions of source code must retain the above copyright 
 *          notice, this list of conditions and the following disclaimer.
 *        * Redistributions in binary form must reproduce the above copyright 
 *          notice, this list of conditions and the following disclaimer in the 
 *          documentation and/or other materials provided with the distribution.
 *        * Neither the name of EURid nor the names of its contributors may be 
 *          used to endorse or promote products derived from this software 
 *          without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *------------------------------------------------------------------------------
 *
 */
/** @defgroup streaming Streams
 *  @ingroup dnscore
 *  @brief 
 *
 *  
 *
 * @{
 *
 *----------------------------------------------------------------------------*/
#include "dnscore/dnscore-config.h"
#include <stdio.h>
#include <stdlib.h>

#include "dnscore/mt_output_stream.h"

#define MT_OUTPUT_STREAM_TAG 0x534F544D /* MTOS */

typedef struct mt_output_stream_data mt_output_stream_data;


struct mt_output_stream_data
{
    output_stream filtered;
    pthread_mutex_t mutex;
    pthread_cond_t cond;
    volatile s32 locked;
};

static ya_result
mt_write(output_stream *stream, const u8 *buffer, u32 len)
{
    mt_output_stream_data *data = (mt_output_stream_data *) stream->data;

    pthread_mutex_lock(&data->mutex);

    data->locked++;

    while(data->locked > 1)
    {
        pthread_cond_wait(&data->cond, &data->mutex);
    }

    ya_result ret = output_stream_write(&data->filtered, buffer, len);

    data->locked--;

    pthread_cond_broadcast(&data->cond);
    pthread_mutex_unlock(&data->mutex);

    return ret;
}

static ya_result
mt_flush(output_stream *stream)
{
    mt_output_stream_data *data = (mt_output_stream_data *) stream->data;

    pthread_mutex_lock(&data->mutex);

    data->locked++;

    while(data->locked > 1)
    {
        pthread_cond_wait(&data->cond, &data->mutex);
    }

    ya_result ret = output_stream_flush(&data->filtered);

    data->locked--;

    pthread_cond_broadcast(&data->cond);
    pthread_mutex_unlock(&data->mutex);

    return ret;
}

static void
mt_close(output_stream *stream)
{
    mt_output_stream_data *data = (mt_output_stream_data *) stream->data;

    pthread_mutex_lock(&data->mutex);

    data->locked++;

    while(data->locked > 1)
    {
        pthread_cond_wait(&data->cond, &data->mutex);
    }

    output_stream_set_void(stream);

    output_stream_close(&data->filtered);

    data->locked--;

    pthread_cond_broadcast(&data->cond);
    pthread_mutex_unlock(&data->mutex);

    pthread_cond_destroy(&data->cond);
    pthread_mutex_destroy(&data->mutex);

    free(data);
}

static const output_stream_vtbl mt_output_stream_vtbl =
{
        mt_write,
        mt_flush,
        mt_close,
        "mt_output_stream",
};

ya_result
mt_output_stream_init(output_stream *stream, output_stream *filtered)
{
    mt_output_stream_data *data;

    if(filtered->vtbl == NULL)
    {
        return INVALID_STATE_ERROR;
    }

    MALLOC_OR_DIE(mt_output_stream_data*, data, sizeof(mt_output_stream_data), MT_OUTPUT_STREAM_TAG);

    data->filtered.data = filtered->data;
    data->filtered.vtbl = filtered->vtbl;

    filtered->data = NULL;            /* Clean the filtered BEFORE setting up the stream */
    filtered->vtbl = NULL;

    pthread_mutex_init(&data->mutex, NULL);
    pthread_cond_init(&data->cond, NULL);
    data->locked = 0;

    stream->data = data;
    stream->vtbl = &mt_output_stream_vtbl;

    return SUCCESS;
}

output_stream *
mt_output_stream_get_filtered(output_stream *bos)
{
    mt_output_stream_data *data = (mt_output_stream_data *) bos->data;

    return &data->filtered;
}

bool
is_mt_output_stream(const output_stream* bos)
{
    return bos->vtbl == &mt_output_stream_vtbl;
}

/** @} */

/*----------------------------------------------------------------------------*/

