| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.datatorrent.lib.db; |
| |
| /** |
| * This is the base implementation for a pass-through output adapter of a transactional store. |
| * This implementation provides the "exactly once" guarantee. |
| * A concrete operator should be created from this skeleton implementation. |
| * <p> |
| * "Pass-through" means it does not wait for end window to write to the store. It will begin transaction at begin window and write to the store as the tuples |
| * come and commit the transaction at end window. |
| * </p> |
| * @displayName Abstract Pass Through Transactionable Store Output |
| * @category Store |
| * @tags transactional, output operator |
| * |
| * @param <T> The tuple type |
| * @param <S> The store type |
| * @since 0.9.3 |
| */ |
| public abstract class AbstractPassThruTransactionableStoreOutputOperator<T, S extends TransactionableStore> extends AbstractTransactionableStoreOutputOperator<T, S> |
| { |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| super.beginWindow(windowId); |
| store.beginTransaction(); |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| store.storeCommittedWindowId(appId, operatorId, currentWindowId); |
| store.commitTransaction(); |
| committedWindowId = currentWindowId; |
| super.endWindow(); |
| } |
| |
| } |