コード例 #1
0
ファイル: Backend.java プロジェクト: rlwu607/titan
 public BackendTransaction beginTransaction() throws StorageException {
   StoreTransaction tx = storeManager.beginTransaction(ConsistencyLevel.DEFAULT);
   if (bufferSize > 1) {
     assert storeManager.getFeatures().supportsBatchMutation();
     if (isKeyColumnValueStore) {
       assert storeManager instanceof KeyColumnValueStoreManager;
       tx =
           new BufferTransaction(
               tx,
               (KeyColumnValueStoreManager) storeManager,
               bufferSize,
               writeAttempts,
               persistAttemptWaittime);
     } else {
       assert storeManager instanceof KeyValueStoreManager;
       // TODO: support buffer mutations
     }
   }
   if (!storeFeatures.supportsLocking()) {
     if (storeFeatures.isTransactional()) {
       // No transaction wrapping needed
     } else if (storeFeatures.supportsConsistentKeyOperations()) {
       tx =
           new ConsistentKeyLockTransaction(
               tx, storeManager.beginTransaction(ConsistencyLevel.KEY_CONSISTENT));
     }
   }
   return new BackendTransaction(tx);
 }
コード例 #2
0
ファイル: Backend.java プロジェクト: rlwu607/titan
 private KeyColumnValueStore getLockStore(KeyColumnValueStore store) throws StorageException {
   if (!storeFeatures.supportsLocking()) {
     if (storeFeatures.isTransactional()) {
       store = new TransactionalLockStore(store);
     } else if (storeFeatures.supportsConsistentKeyOperations()) {
       store =
           new ConsistentKeyLockStore(
               store, getStore(store.getName() + LOCK_STORE_SUFFIX), lockConfiguration);
     } else throw new IllegalArgumentException("Store needs to support some form of locking");
   }
   return store;
 }
コード例 #3
0
ファイル: Backend.java プロジェクト: rlwu607/titan
  public void initialize(Configuration config) {
    try {
      // EdgeStore & VertexIndexStore
      KeyColumnValueStore idStore = getStore(ID_STORE_NAME);
      idAuthority = null;
      if (storeFeatures.isTransactional()) {
        idAuthority = new TransactionalIDManager(idStore, storeManager, config);
      } else if (storeFeatures.supportsConsistentKeyOperations()) {
        idAuthority = new ConsistentKeyIDManager(idStore, storeManager, config);
      } else {
        idAuthority = new TransactionalIDManager(idStore, storeManager, config);
        log.error(
            "Store needs to support consistent key or transactional operations for ID manager to guarantee proper id allocations");
      }
      edgeStore = getLockStore(getBufferStore(EDGESTORE_NAME));
      vertexIndexStore = getLockStore(getBufferStore(VERTEXINDEX_STORE_NAME));

      if (hashPrefixIndex)
        vertexIndexStore = new HashPrefixKeyColumnValueStore(vertexIndexStore, 4);
    } catch (StorageException e) {
      throw new TitanException("Could not initialize backend", e);
    }
  }