예제 #1
0
  public Backend(Configuration storageConfig) {
    this.storageConfig = storageConfig;

    storeManager = getStorageManager(storageConfig);
    indexes = getIndexes(storageConfig);
    storeFeatures = storeManager.getFeatures();

    basicMetrics = storageConfig.getBoolean(BASIC_METRICS, BASIC_METRICS_DEFAULT);
    mergeBasicMetrics =
        storageConfig.getBoolean(MERGE_BASIC_METRICS_KEY, MERGE_BASIC_METRICS_DEFAULT);

    int bufferSizeTmp = storageConfig.getInt(BUFFER_SIZE_KEY, BUFFER_SIZE_DEFAULT);
    Preconditions.checkArgument(
        bufferSizeTmp >= 0, "Buffer size must be non-negative (use 0 to disable)");
    if (!storeFeatures.supportsBatchMutation()) {
      bufferSize = 0;
      log.debug("Buffering disabled because backend does not support batch mutations");
    } else bufferSize = bufferSizeTmp;

    writeAttempts = storageConfig.getInt(WRITE_ATTEMPTS_KEY, WRITE_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(writeAttempts > 0, "Write attempts must be positive");
    readAttempts = storageConfig.getInt(READ_ATTEMPTS_KEY, READ_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(readAttempts > 0, "Read attempts must be positive");
    persistAttemptWaittime =
        storageConfig.getInt(STORAGE_ATTEMPT_WAITTIME_KEY, STORAGE_ATTEMPT_WAITTIME_DEFAULT);
    Preconditions.checkArgument(
        persistAttemptWaittime > 0, "Persistence attempt retry wait time must be non-negative");

    // If lock prefix is unspecified, specify it now
    storageConfig.setProperty(
        ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY,
        storageConfig.getString(
            ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY, storeManager.getName()));

    final String lockBackendName =
        storageConfig.getString(
            GraphDatabaseConfiguration.LOCK_BACKEND,
            GraphDatabaseConfiguration.LOCK_BACKEND_DEFAULT);
    if (REGISTERED_LOCKERS.containsKey(lockBackendName)) {
      lockerCreator = REGISTERED_LOCKERS.get(lockBackendName);
    } else {
      throw new TitanConfigurationException(
          "Unknown lock backend \""
              + lockBackendName
              + "\".  Known lock backends: "
              + Joiner.on(", ").join(REGISTERED_LOCKERS.keySet())
              + ".");
    }
    // Never used for backends that have innate transaction support, but we
    // want to maintain the non-null invariant regardless; it will default
    // to connsistentkey impl if none is specified
    Preconditions.checkNotNull(lockerCreator);

    if (storeFeatures.isDistributed() && storeFeatures.isKeyOrdered()) {
      log.debug("Wrapping index store with HashPrefix");
      hashPrefixIndex = true;
    } else {
      hashPrefixIndex = false;
    }
  }
예제 #2
0
파일: Backend.java 프로젝트: rlwu607/titan
  public Backend(Configuration storageConfig) {
    storeManager = getStorageManager(storageConfig);
    isKeyColumnValueStore = storeManager instanceof KeyColumnValueStoreManager;
    storeFeatures = storeManager.getFeatures();

    int bufferSizeTmp = storageConfig.getInt(BUFFER_SIZE_KEY, BUFFER_SIZE_DEFAULT);
    Preconditions.checkArgument(
        bufferSizeTmp >= 0, "Buffer size must be non-negative (use 0 to disable)");
    if (!storeFeatures.supportsBatchMutation()) {
      bufferSize = 0;
      log.debug("Buffering disabled because backend does not support batch mutations");
    } else bufferSize = bufferSizeTmp;

    if (!storeFeatures.supportsLocking() && storeFeatures.supportsConsistentKeyOperations()) {
      lockConfiguration =
          new ConsistentKeyLockConfiguration(storageConfig, storeManager.toString());
    } else {
      lockConfiguration = null;
    }

    writeAttempts = storageConfig.getInt(WRITE_ATTEMPTS_KEY, WRITE_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(writeAttempts > 0, "Write attempts must be positive");
    readAttempts = storageConfig.getInt(READ_ATTEMPTS_KEY, READ_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(readAttempts > 0, "Read attempts must be positive");
    persistAttemptWaittime =
        storageConfig.getInt(STORAGE_ATTEMPT_WAITTIME_KEY, STORAGE_ATTEMPT_WAITTIME_DEFAULT);
    Preconditions.checkArgument(
        persistAttemptWaittime > 0, "Persistence attempt retry wait time must be non-negative");

    if (storeFeatures.isDistributed() && storeFeatures.isKeyOrdered()) {
      log.debug("Wrapping index store with HashPrefix");
      hashPrefixIndex = true;
    } else {
      hashPrefixIndex = false;
    }
  }