CodecTests.java example

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package org.elasticsearch.index.codec;

import org.apache.lucene.codecs.Codec;
import org.apache.lucene.codecs.lucene40.Lucene40Codec;
import org.apache.lucene.codecs.lucene41.Lucene41Codec;
import org.apache.lucene.codecs.lucene410.Lucene410Codec;
import org.apache.lucene.codecs.lucene42.Lucene42Codec;
import org.apache.lucene.codecs.lucene45.Lucene45Codec;
import org.apache.lucene.codecs.lucene46.Lucene46Codec;
import org.apache.lucene.codecs.lucene49.Lucene49Codec;
import org.apache.lucene.codecs.lucene50.Lucene50Codec;
import org.apache.lucene.codecs.lucene50.Lucene50StoredFieldsFormat;
import org.apache.lucene.codecs.lucene50.Lucene50StoredFieldsFormat.Mode;
import org.apache.lucene.codecs.lucene53.Lucene53Codec;
import org.apache.lucene.codecs.lucene54.Lucene54Codec;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.SegmentReader;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase.SuppressCodecs;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.test.ESSingleNodeTestCase;
import org.junit.Test;

import static org.hamcrest.Matchers.instanceOf;

@SuppressCodecs("*") // we test against default codec so never get a random one here!
public class CodecTests extends ESSingleNodeTestCase {

    @Test
    public void testResolveDefaultCodecs() throws Exception {
        CodecService codecService = createCodecService();
        assertThat(codecService.codec("default"), instanceOf(PerFieldMappingPostingFormatCodec.class));
        assertThat(codecService.codec("default"), instanceOf(Lucene54Codec.class));
        assertThat(codecService.codec("Lucene53"), instanceOf(Lucene53Codec.class));
        assertThat(codecService.codec("Lucene50"), instanceOf(Lucene50Codec.class));
        assertThat(codecService.codec("Lucene410"), instanceOf(Lucene410Codec.class));
        assertThat(codecService.codec("Lucene49"), instanceOf(Lucene49Codec.class));
        assertThat(codecService.codec("Lucene46"), instanceOf(Lucene46Codec.class));
        assertThat(codecService.codec("Lucene45"), instanceOf(Lucene45Codec.class));
        assertThat(codecService.codec("Lucene40"), instanceOf(Lucene40Codec.class));
        assertThat(codecService.codec("Lucene41"), instanceOf(Lucene41Codec.class));
        assertThat(codecService.codec("Lucene42"), instanceOf(Lucene42Codec.class));
    }
    
    public void testDefault() throws Exception {
        Codec codec = createCodecService().codec("default");
        assertCompressionEquals(Mode.BEST_SPEED, codec);
    }
    
    public void testBestCompression() throws Exception {
        Codec codec = createCodecService().codec("best_compression");
        assertCompressionEquals(Mode.BEST_COMPRESSION, codec);
    }
    
    // write some docs with it, inspect .si to see this was the used compression
    private void assertCompressionEquals(Mode expected, Codec actual) throws Exception {
        Directory dir = newDirectory();
        IndexWriterConfig iwc = newIndexWriterConfig(null);
        iwc.setCodec(actual);
        IndexWriter iw = new IndexWriter(dir, iwc);
        iw.addDocument(new Document());
        iw.commit();
        iw.close();
        DirectoryReader ir = DirectoryReader.open(dir);
        SegmentReader sr = (SegmentReader) ir.leaves().get(0).reader();
        String v = sr.getSegmentInfo().info.getAttribute(Lucene50StoredFieldsFormat.MODE_KEY);
        assertNotNull(v);
        assertEquals(expected, Mode.valueOf(v));
        ir.close();
        dir.close();
    }

    private CodecService createCodecService() {
        return createCodecService(Settings.Builder.EMPTY_SETTINGS);
    }

    private CodecService createCodecService(Settings settings) {
        IndexService indexService = createIndex("test", settings);
        return indexService.injector().getInstance(CodecService.class);
    }

}