| /* |
| 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 org.apache.edgent.oplet.core; |
| |
| import org.apache.edgent.oplet.OpletContext; |
| |
| /** |
| * Union oplet, merges multiple input ports |
| * into a single output port. |
| * |
| * Processing for each input is identical |
| * and just submits the tuple to the single output. |
| * |
| * @param <T> Tuple type |
| */ |
| public final class Union<T> extends FanIn<T, T> { |
| |
| @Override |
| public void start() { |
| } |
| |
| |
| @Override |
| public void initialize(OpletContext<T, T> context) { |
| super.initialize(context); |
| |
| // forward every tuple to the output port |
| setReceiver((tuple, iportIndex) -> tuple); |
| } |
| |
| @Override |
| public void close() { |
| } |
| } |