/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2012-2015, Magnus Edenhill
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * 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 OWNER 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.
 */

#include "test.h"

/* Typical include path would be <librdkafka/rdkafka.h>, but this program
 * is built from within the librdkafka source tree and thus differs. */
#include "rdkafka.h"  /* for Kafka driver */


/**
 * Consume with batch + queue interface
 *
 */


static int do_test_consume_batch (void) {
#define topic_cnt 2
	char *topics[topic_cnt];
        const int partition_cnt = 2;
	rd_kafka_t *rk;
        rd_kafka_queue_t *rkq;
        rd_kafka_topic_t *rkts[topic_cnt];
	rd_kafka_resp_err_t err;
        const int msgcnt = 10000;
        uint64_t testid;
        int i, p;
        int batch_cnt = 0;
        int remains;

        testid = test_id_generate();

        /* Produce messages */
        for (i = 0 ; i < topic_cnt ; i++) {
                topics[i] = rd_strdup(test_mk_topic_name(__FUNCTION__, 1));
                for (p = 0 ; p < partition_cnt ; p++)
                        test_produce_msgs_easy(topics[i], testid, p,
                                               msgcnt / topic_cnt /
                                               partition_cnt);
        }


        /* Create simple consumer */
        rk = test_create_consumer(NULL, NULL, NULL, NULL);

        /* Create generic consume queue */
        rkq = rd_kafka_queue_new(rk);

        for (i = 0 ; i < topic_cnt ; i++) {
                /* Create topic object */
                rkts[i] = test_create_topic_object(rk, topics[i],
						   "auto.offset.reset",
						   "smallest",
						   NULL);

                /* Start consuming each partition and redirect
                 * messages to queue */

                TEST_SAY("Start consuming topic %s partitions 0..%d\n",
                         rd_kafka_topic_name(rkts[i]), partition_cnt);

                for (p = 0 ; p < partition_cnt ; p++) {
                        err = rd_kafka_consume_start_queue(
                                rkts[i], p, RD_KAFKA_OFFSET_BEGINNING, rkq);
                        if (err)
                                TEST_FAIL("Failed to start consuming: %s\n",
                                          rd_kafka_err2str(err));
                }
        }

        remains = msgcnt;

        /* Consume messages from common queue using batch interface. */
        TEST_SAY("Consume %d messages from queue\n", remains);
        while (remains > 0) {
                rd_kafka_message_t *rkmessage[1000];
                ssize_t r;
                test_timing_t t_batch;

                TIMING_START(&t_batch, "CONSUME.BATCH");
                r = rd_kafka_consume_batch_queue(rkq, 1000, rkmessage, 1000);
                TIMING_STOP(&t_batch);

                TEST_SAY("Batch consume iteration #%d: Consumed %"PRIdsz
                         "/1000 messages\n", batch_cnt, r);

                if (r == -1)
                        TEST_FAIL("Failed to consume messages: %s\n",
                                  rd_kafka_err2str(rd_kafka_last_error()));

                remains -= (int)r;

                for (i = 0 ; i < r ; i++)
                        rd_kafka_message_destroy(rkmessage[i]);

                batch_cnt++;
        }


        TEST_SAY("Stopping consumer\n");
        for (i = 0 ; i < topic_cnt ; i++) {
                for (p = 0 ; p < partition_cnt ; p++) {
                        err = rd_kafka_consume_stop(rkts[i], p);
                        if (err)
                                TEST_FAIL("Failed to stop consuming: %s\n",
                                          rd_kafka_err2str(err));
                }

                rd_kafka_topic_destroy(rkts[i]);
                rd_free(topics[i]);
        }

        rd_kafka_queue_destroy(rkq);

        rd_kafka_destroy(rk);

        return 0;
}




int main_0022_consume_batch (int argc, char **argv) {
        int fails = 0;

        fails += do_test_consume_batch();

        if (fails > 0)
                TEST_FAIL("See %d previous error(s)\n", fails);

        return 0;
}
