| /* |
| 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.functional; |
| |
| |
| import static org.apache.edgent.function.Functions.closeFunction; |
| |
| import org.apache.edgent.function.Consumer; |
| |
| /** |
| * Functional peek oplet. |
| * |
| * Each peek calls {@code peeker.accept(tuple)}. |
| * |
| * @param <T> Tuple type. |
| */ |
| public class Peek<T> extends org.apache.edgent.oplet.core.Peek<T> { |
| private static final long serialVersionUID = 1L; |
| private final Consumer<T> peeker; |
| |
| /** |
| * Peek oplet using a function to peek. |
| * @param peeker Function that peeks at the tuple. |
| */ |
| public Peek(Consumer<T> peeker) { |
| this.peeker = peeker; |
| } |
| |
| protected Consumer<T> getPeeker() { |
| return peeker; |
| } |
| |
| @Override |
| protected void peek(T tuple) { |
| peeker.accept(tuple); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| closeFunction(peeker); |
| } |
| } |