Examples of org.rocksdb.RocksDB

org.rocksdb.RocksDB
A RocksDB is a persistent ordered map from keys to values. It is safe for concurrent access from multiple threads without any external synchronization. All methods of this class could potentially throw RocksDBException, which indicates sth wrong at the RocksDB library side and the call failed.

  @Rule
  public TemporaryFolder dbFolder = new TemporaryFolder();


  @Test
  public void rocksIterator() throws RocksDBException {
    RocksDB db = null;
    Options options = null;
    RocksIterator iterator = null;
    try {
      options = new Options();
      options.setCreateIfMissing(true)
          .setCreateMissingColumnFamilies(true);
      db = RocksDB.open(options,
          dbFolder.getRoot().getAbsolutePath());
      db.put("key1".getBytes(), "value1".getBytes());
      db.put("key2".getBytes(), "value2".getBytes());


      iterator = db.newIterator();


      iterator.seekToFirst();
      assertThat(iterator.isValid()).isTrue();
      assertThat(iterator.key()).isEqualTo("key1".getBytes());
      assertThat(iterator.value()).isEqualTo("value1".getBytes());
      iterator.next();
      assertThat(iterator.isValid()).isTrue();
      assertThat(iterator.key()).isEqualTo("key2".getBytes());
      assertThat(iterator.value()).isEqualTo("value2".getBytes());
      iterator.next();
      assertThat(iterator.isValid()).isFalse();
      iterator.seekToLast();
      iterator.prev();
      assertThat(iterator.isValid()).isTrue();
      assertThat(iterator.key()).isEqualTo("key1".getBytes());
      assertThat(iterator.value()).isEqualTo("value1".getBytes());
      iterator.seekToFirst();
      iterator.seekToLast();
      assertThat(iterator.isValid()).isTrue();
      assertThat(iterator.key()).isEqualTo("key2".getBytes());
      assertThat(iterator.value()).isEqualTo("value2".getBytes());
      iterator.status();
    } finally {
      if (db != null) {
        db.close();
      }
      if (options != null) {
        options.dispose();
      }
      if (iterator != null) {

View Full Code Here

  }


  @Test
  public void rocksIteratorGc()
      throws RocksDBException {
    RocksDB db = null;
    Options options = null;
    try {
      options = new Options();
      options.setCreateIfMissing(true)
          .setCreateMissingColumnFamilies(true);
      db = RocksDB.open(options,
          dbFolder.getRoot().getAbsolutePath());
      db.put("key".getBytes(), "value".getBytes());
      db.newIterator();
      db.newIterator();
      RocksIterator iter3 = db.newIterator();
      db.close();
      db = null;
      System.gc();
      System.runFinalization();
      iter3.dispose();
      System.gc();
      System.runFinalization();
    } finally {
      if (db != null) {
        db.close();
      }
      if (options != null) {
        options.dispose();
      }
    }

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  @Rule
  public TemporaryFolder dbFolder = new TemporaryFolder();


  @Test
  public void snapshots() throws RocksDBException {
    RocksDB db = null;
    Options options = null;
    ReadOptions readOptions = null;
    try {


      options = new Options();
      options.setCreateIfMissing(true);


      db = RocksDB.open(options, dbFolder.getRoot().getAbsolutePath());
      db.put("key".getBytes(), "value".getBytes());
      // Get new Snapshot of database
      Snapshot snapshot = db.getSnapshot();
      readOptions = new ReadOptions();
      // set snapshot in ReadOptions
      readOptions.setSnapshot(snapshot);
      // retrieve key value pair
      assertThat(new String(db.get("key".getBytes()))).
          isEqualTo("value");
      // retrieve key value pair created before
      // the snapshot was made
      assertThat(new String(db.get(readOptions,
          "key".getBytes()))).isEqualTo("value");
      // add new key/value pair
      db.put("newkey".getBytes(), "newvalue".getBytes());
      // using no snapshot the latest db entries
      // will be taken into account
      assertThat(new String(db.get("newkey".getBytes()))).
          isEqualTo("newvalue");
      // snapshopot was created before newkey
      assertThat(db.get(readOptions, "newkey".getBytes())).
          isNull();
      // Retrieve snapshot from read options
      Snapshot sameSnapshot = readOptions.snapshot();
      readOptions.setSnapshot(sameSnapshot);
      // results must be the same with new Snapshot
      // instance using the same native pointer
      assertThat(new String(db.get(readOptions,
          "key".getBytes()))).isEqualTo("value");
      // update key value pair to newvalue
      db.put("key".getBytes(), "newvalue".getBytes());
      // read with previously created snapshot will
      // read previous version of key value pair
      assertThat(new String(db.get(readOptions,
          "key".getBytes()))).isEqualTo("value");
      // read for newkey using the snapshot must be
      // null
      assertThat(db.get(readOptions, "newkey".getBytes())).
          isNull();
      // setting null to snapshot in ReadOptions leads
      // to no Snapshot being used.
      readOptions.setSnapshot(null);
      assertThat(new String(db.get(readOptions,
          "newkey".getBytes()))).isEqualTo("newvalue");
      // release Snapshot
      db.releaseSnapshot(snapshot);
    } finally {
      if (db != null) {
        db.close();
      }
      if (options != null) {
        options.dispose();
      }
      if (readOptions != null) {

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Related Classes of org.rocksdb.RocksDB

org.rocksdb.test.RocksIteratorTest

org.rocksdb.test.SnapshotTest

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