Package org.rocksdb

Examples of org.rocksdb.ReadOptions

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  @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) {
        readOptions.dispose();
      }
    }
  }
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  @Rule
  public ExpectedException exception = ExpectedException.none();

  @Test
  public void verifyChecksum(){
    ReadOptions opt = null;
    try {
      opt = new ReadOptions();
      Random rand = new Random();
      boolean boolValue = rand.nextBoolean();
      opt.setVerifyChecksums(boolValue);
      assertThat(opt.verifyChecksums()).isEqualTo(boolValue);
    } finally {
      if (opt != null) {
        opt.dispose();
      }
    }
  }
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    }
  }

  @Test
  public void fillCache(){
    ReadOptions opt = null;
    try {
      opt = new ReadOptions();
      Random rand = new Random();
      boolean boolValue = rand.nextBoolean();
      opt.setFillCache(boolValue);
      assertThat(opt.fillCache()).isEqualTo(boolValue);
    } finally {
      if (opt != null) {
        opt.dispose();
      }
    }
  }
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    }
  }

  @Test
  public void tailing(){
    ReadOptions opt = null;
    try {
      opt = new ReadOptions();
      Random rand = new Random();
      boolean boolValue = rand.nextBoolean();
      opt.setTailing(boolValue);
      assertThat(opt.tailing()).isEqualTo(boolValue);
    } finally {
      if (opt != null) {
        opt.dispose();
      }
    }
  }
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    }
  }

  @Test
  public void snapshot(){
    ReadOptions opt = null;
    try {
      opt = new ReadOptions();
      opt.setSnapshot(null);
      assertThat(opt.snapshot()).isNull();
    } finally {
      if (opt != null) {
        opt.dispose();
      }
    }
  }
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    }
  }

  @Test
  public void failSetVerifyChecksumUninitialized(){
    ReadOptions readOptions = setupUninitializedReadOptions(
        exception);
    readOptions.setVerifyChecksums(true);
  }
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    readOptions.setVerifyChecksums(true);
  }

  @Test
  public void failVerifyChecksumUninitialized(){
    ReadOptions readOptions = setupUninitializedReadOptions(
        exception);
    readOptions.verifyChecksums();
  }
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    readOptions.verifyChecksums();
  }

  @Test
  public void failSetFillCacheUninitialized(){
    ReadOptions readOptions = setupUninitializedReadOptions(
        exception);
    readOptions.setFillCache(true);
  }
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    readOptions.setFillCache(true);
  }

  @Test
  public void failFillCacheUninitialized(){
    ReadOptions readOptions = setupUninitializedReadOptions(
        exception);
    readOptions.fillCache();
  }
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    readOptions.fillCache();
  }

  @Test
  public void failSetTailingUninitialized(){
    ReadOptions readOptions = setupUninitializedReadOptions(
        exception);
    readOptions.setTailing(true);
  }
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Related Classes of org.rocksdb.ReadOptions

  • org.rocksdb.test.ReadOptionsTest
  • org.rocksdb.test.SnapshotTest
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