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 * You may obtain a copy of the License at
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.indices.cache.query;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.indices.cache.request.IndicesRequestCache;
import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram.Bucket;
import org.elasticsearch.test.ESIntegTestCase;

import java.util.List;

import static org.elasticsearch.search.aggregations.AggregationBuilders.dateHistogram;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertSearchResponse;
import static org.hamcrest.Matchers.greaterThan;

public class IndicesRequestCacheIT extends ESIntegTestCase {

    // One of the primary purposes of the query cache is to cache aggs results
    public void testCacheAggs() throws Exception {
        assertAcked(client().admin().indices().prepareCreate("index")
                .addMapping("type", "f", "type=date")
                .setSettings(IndicesRequestCache.INDEX_CACHE_REQUEST_ENABLED, true).get());
        indexRandom(true,
                client().prepareIndex("index", "type").setSource("f", "2014-03-10T00:00:00.000Z"),
                client().prepareIndex("index", "type").setSource("f", "2014-05-13T00:00:00.000Z"));
        ensureSearchable("index");

        // This is not a random example: serialization with time zones writes shared strings
        // which used to not work well with the query cache because of the handles stream output
        // see #9500
        final SearchResponse r1 = client().prepareSearch("index").setSize(0).setSearchType(SearchType.QUERY_THEN_FETCH)
            .addAggregation(dateHistogram("histo").field("f").timeZone("+01:00").minDocCount(0).interval(DateHistogramInterval.MONTH)).get();
        assertSearchResponse(r1);

        // The cached is actually used
        assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getMemorySizeInBytes(), greaterThan(0l));

        for (int i = 0; i < 10; ++i) {
            final SearchResponse r2 = client().prepareSearch("index").setSize(0).setSearchType(SearchType.QUERY_THEN_FETCH)
                    .addAggregation(dateHistogram("histo").field("f").timeZone("+01:00").minDocCount(0).interval(DateHistogramInterval.MONTH)).get();
            assertSearchResponse(r2);
            Histogram h1 = r1.getAggregations().get("histo");
            Histogram h2 = r2.getAggregations().get("histo");
            final List<? extends Bucket> buckets1 = h1.getBuckets();
            final List<? extends Bucket> buckets2 = h2.getBuckets();
            assertEquals(buckets1.size(), buckets2.size());
            for (int j = 0; j < buckets1.size(); ++j) {
                final Bucket b1 = buckets1.get(j);
                final Bucket b2 = buckets2.get(j);
                assertEquals(b1.getKey(), b2.getKey());
                assertEquals(b1.getDocCount(), b2.getDocCount());
            }
        }
    }

}