Examples of org.apache.lucene.index.SnapshotDeletionPolicy

org.apache.lucene.index.SnapshotDeletionPolicy
A {@link IndexDeletionPolicy} that wraps around any other{@link IndexDeletionPolicy} and adds the ability to hold andlater release a single "snapshot" of an index. While the snapshot is held, the {@link IndexWriter} will notremove any files associated with it even if the index is otherwise being actively, arbitrarily changed. Because we wrap another arbitrary {@link IndexDeletionPolicy}, this gives you the freedom to continue using whatever {@link IndexDeletionPolicy} you would normally want to use with yourindex. Note that you can re-use a single instance of SnapshotDeletionPolicy across multiple writers as long as they are against the same index Directory. Any snapshot held when a writer is closed will "survive" when the next writer is opened.
WARNING: This API is a new and experimental and may suddenly change.

  public void testExistingSnapshots() throws Exception {
    // Tests the ability to construct a SDP from existing snapshots, and
    // asserts that those snapshots/commit points are protected.
    int numSnapshots = 3;
    Directory dir = newDirectory();
    SnapshotDeletionPolicy sdp = getDeletionPolicy();
    IndexWriter writer = new IndexWriter(dir, getConfig(random, sdp));
    prepareIndexAndSnapshots(sdp, writer, numSnapshots, "snapshot");
    writer.close();


    // Make a new policy and initialize with snapshots.
    sdp = getDeletionPolicy(sdp.getSnapshots());
    writer = new IndexWriter(dir, getConfig(random, sdp));
    // attempt to delete unused files - the snapshotted files should not be deleted
    writer.deleteUnusedFiles();
    writer.close();
    assertSnapshotExists(dir, sdp, numSnapshots);

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    callback = new IndexReadyCallback(handlerDir);
    handler = new IndexReplicationHandler(handlerDir, callback);
    client = new ReplicationClient(replicator, handler, sourceDirFactory);
    
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    publishWriter = new IndexWriter(publishDir, conf);
  }

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    callback = new IndexAndTaxonomyReadyCallback(handlerIndexDir, handlerTaxoDir);
    handler = new IndexAndTaxonomyReplicationHandler(handlerIndexDir, handlerTaxoDir, callback);
    client = new ReplicationClient(replicator, handler, sourceDirFactory);
    
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    publishIndexWriter = new IndexWriter(publishIndexDir, conf);
    publishTaxoWriter = new SnapshotDirectoryTaxonomyWriter(publishTaxoDir);
  }

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  @Override
  public void setUp() throws Exception {
    super.setUp();
    sourceDir = newDirectory();
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    sourceWriter = new IndexWriter(sourceDir, conf);
    replicator = new LocalReplicator();
  }

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    }
    
    @Override
    protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
      IndexWriterConfig conf = super.createIndexWriterConfig(openMode);
      sdp = new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy());
      conf.setIndexDeletionPolicy(sdp);
      return conf;
    }

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  @Test
  public void testNoCommit() throws Exception {
    Directory indexDir = newDirectory();
    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    IndexWriter indexWriter = new IndexWriter(indexDir, conf);
    
    Directory taxoDir = newDirectory();
    SnapshotDirectoryTaxonomyWriter taxoWriter = new SnapshotDirectoryTaxonomyWriter(taxoDir);
    try {

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  @Test
  public void testRevisionRelease() throws Exception {
    Directory indexDir = newDirectory();
    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    IndexWriter indexWriter = new IndexWriter(indexDir, conf);
    
    Directory taxoDir = newDirectory();
    SnapshotDirectoryTaxonomyWriter taxoWriter = new SnapshotDirectoryTaxonomyWriter(taxoDir);
    try {

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  @Test
  public void testSegmentsFileLast() throws Exception {
    Directory indexDir = newDirectory();
    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    IndexWriter indexWriter = new IndexWriter(indexDir, conf);
    
    Directory taxoDir = newDirectory();
    SnapshotDirectoryTaxonomyWriter taxoWriter = new SnapshotDirectoryTaxonomyWriter(taxoDir);
    try {

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  @Test
  public void testOpen() throws Exception {
    Directory indexDir = newDirectory();
    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    IndexWriter indexWriter = new IndexWriter(indexDir, conf);
    
    Directory taxoDir = newDirectory();
    SnapshotDirectoryTaxonomyWriter taxoWriter = new SnapshotDirectoryTaxonomyWriter(taxoDir);
    try {

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  @Test
  public void testNoCommit() throws Exception {
    Directory dir = newDirectory();
    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
    conf.setIndexDeletionPolicy(new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()));
    IndexWriter writer = new IndexWriter(dir, conf);
    try {
      assertNotNull(new IndexRevision(writer));
      fail("should have failed when there are no commits to snapshot");
    } catch (IllegalStateException e) {

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