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 * ownership. Elasticsearch 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
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package org.elasticsearch.versioning;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.test.ESIntegTestCase;

import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;

import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.nullValue;

public class ConcurrentDocumentOperationIT extends ESIntegTestCase {
    public void testConcurrentOperationOnSameDoc() throws Exception {
        logger.info("--> create an index with 1 shard and max replicas based on nodes");
        assertAcked(prepareCreate("test")
                .setSettings(Settings.builder().put(indexSettings()).put("index.number_of_shards", 1)));

        logger.info("execute concurrent updates on the same doc");
        int numberOfUpdates = 100;
        final AtomicReference<Throwable> failure = new AtomicReference<>();
        final CountDownLatch latch = new CountDownLatch(numberOfUpdates);
        for (int i = 0; i < numberOfUpdates; i++) {
            client().prepareIndex("test", "type1", "1").setSource("field1", i).execute(new ActionListener<IndexResponse>() {
                @Override
                public void onResponse(IndexResponse response) {
                    latch.countDown();
                }

                @Override
                public void onFailure(Exception e) {
                    logger.error("Unexpected exception while indexing", e);
                    failure.set(e);
                    latch.countDown();
                }
            });
        }

        latch.await();

        assertThat(failure.get(), nullValue());

        client().admin().indices().prepareRefresh().execute().actionGet();

        logger.info("done indexing, check all have the same field value");
        Map masterSource = client().prepareGet("test", "type1", "1").execute().actionGet().getSourceAsMap();
        for (int i = 0; i < (cluster().size() * 5); i++) {
            assertThat(client().prepareGet("test", "type1", "1").execute().actionGet().getSourceAsMap(), equalTo(masterSource));
        }
    }
}
