| /* |
| * 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.util; |
| |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.Operator.Unifier; |
| |
| /** |
| * |
| * This unifier consumes boolean tuples. |
| * All the tuples received within an application window are ORED together and the result is emitted at the end of the window. |
| * <p> |
| * The processing is done with sticky key partitioning, i.e. each one key belongs only to one partition. |
| * </p> |
| * @displayName Unifier Boolean Or |
| * @category Algorithmic |
| * @tags unifier, or |
| * @since 0.3.2 |
| */ |
| public class UnifierBooleanOr implements Unifier<Boolean> |
| { |
| boolean result = false; |
| /** |
| * This is the output port which emits the ORED tuple result. |
| */ |
| public final transient DefaultOutputPort<Boolean> mergedport = new DefaultOutputPort<Boolean>(); |
| |
| /** |
| * emits result if any partition returns true. Then on the window emits no more tuples |
| * @param tuple incoming tuple from a partition |
| */ |
| @Override |
| public void process(Boolean tuple) |
| { |
| if (!result) { |
| if (tuple) { |
| mergedport.emit(true); |
| } |
| result = true; |
| } |
| } |
| |
| /** |
| * resets flag |
| * @param windowId |
| */ |
| @Override |
| public void beginWindow(long windowId) |
| { |
| result = false; |
| } |
| |
| /** |
| * noop |
| */ |
| @Override |
| public void endWindow() |
| { |
| } |
| |
| /** |
| * a no-op |
| * @param context |
| */ |
| @Override |
| public void setup(OperatorContext context) |
| { |
| } |
| |
| /** |
| * a noop |
| */ |
| @Override |
| public void teardown() |
| { |
| } |
| } |