examples/producer_consumer/database/private/src/reader.c

/**
 * 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.
 */

/*
 * reader.c
 *
 *  \date       16 Feb 2015
 *  \author     <a href="mailto:dev@celix.apache.org">Apache Celix Project Team</a>
 *  \copyright  Apache License, Version 2.0
 */



#include <pthread.h>

#include "array_list.h"
#include "celix_errno.h"
#include "data.h"
#include "database.h"
#include "reader_service.h"


celix_status_t readerService_getFirstData(database_handler_pt handler, data_pt firstData)
{
	celix_status_t status = CELIX_BUNDLE_EXCEPTION;

	celixThreadMutex_lock(&handler->lock);

	if ((firstData = (data_pt) arrayList_remove(handler->data, 0)) != NULL)
	{
		handler->dataIndex--;
		status = CELIX_SUCCESS;
	}

    celixThreadMutex_unlock(&handler->lock);

	return status;
}


celix_status_t readerService_getNextData(database_handler_pt handler, data_pt* nextData)
{
	celix_status_t status = CELIX_BUNDLE_EXCEPTION;

    celixThreadMutex_lock(&handler->lock);

	if (((*nextData) = (data_pt) arrayList_get(handler->data, handler->dataIndex)) != NULL)
	{
		handler->dataIndex++;
		status = CELIX_SUCCESS;
	}

    celixThreadMutex_unlock(&handler->lock);

	return status;
}