| /* |
| 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 java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.edgent.function.Consumer; |
| import org.apache.edgent.oplet.OpletContext; |
| |
| /** |
| * Pipe oplet with a single input and output. |
| * |
| * @param <I> |
| * Data container type for input tuples. |
| * @param <O> |
| * Data container type for output tuples. |
| */ |
| public abstract class Pipe<I, O> extends AbstractOplet<I, O>implements Consumer<I> { |
| private static final long serialVersionUID = 1L; |
| |
| private Consumer<O> destination; |
| |
| @Override |
| public void initialize(OpletContext<I, O> context) { |
| super.initialize(context); |
| |
| destination = context.getOutputs().get(0); |
| } |
| |
| @Override |
| public void start() { |
| } |
| |
| @Override |
| public List<Consumer<I>> getInputs() { |
| return Collections.singletonList(this); |
| } |
| |
| protected Consumer<O> getDestination() { |
| return destination; |
| } |
| |
| /** |
| * Submit a tuple to single output. |
| * @param tuple Tuple to be submitted. |
| */ |
| protected void submit(O tuple) { |
| getDestination().accept(tuple); |
| } |
| } |