| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.Context.OperatorContext; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.Operator.Unifier; |
| |
| /** |
| * This unifier consumes boolean tuples. |
| * All the tuples received within an application window are ANDED 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 And |
| * @category Algorithmic |
| * @tags unifier, and |
| * @since 0.3.2 |
| */ |
| public class UnifierBooleanAnd implements Unifier<Boolean> |
| { |
| boolean result = true; |
| boolean doemit = false; |
| |
| /** |
| * This is the output port which emits the ANDED input tuples result. |
| */ |
| public final transient DefaultOutputPort<Boolean> mergedport = new DefaultOutputPort<Boolean>(); |
| |
| /** |
| * ANDs tuple with result so far |
| * @param tuple incoming tuple from a partition |
| */ |
| @Override |
| public void process(Boolean tuple) |
| { |
| doemit = true; |
| result = tuple && result; |
| } |
| |
| /** |
| * resets flag to true |
| * @param windowId |
| */ |
| @Override |
| public void beginWindow(long windowId) |
| { |
| result = true; |
| doemit = false; |
| } |
| |
| /** |
| * emits the result |
| */ |
| @Override |
| public void endWindow() |
| { |
| if (doemit) { |
| mergedport.emit(result); |
| } |
| } |
| |
| /** |
| * a no-op |
| * @param context |
| */ |
| @Override |
| public void setup(OperatorContext context) |
| { |
| } |
| |
| /** |
| * a noop |
| */ |
| @Override |
| public void teardown() |
| { |
| } |
| } |