001/* 002 * (C) Copyright 2017 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * bdelbosc 018 */ 019package org.nuxeo.lib.stream.computation; 020 021import java.util.stream.Collectors; 022import java.util.stream.IntStream; 023 024/** 025 * An abstract {@link Computation} that manages the metadata init. The inputs streams are named i1, i2 ... The output 026 * streams are named o1, o2 ... 027 * 028 * @since 9.3 029 */ 030public abstract class AbstractComputation implements Computation { 031 protected final ComputationMetadata metadata; 032 033 public AbstractComputation(String name, int nbInputStreams, int nbOutputStreams) { 034 this.metadata = new ComputationMetadata(name, 035 IntStream.range(1, nbInputStreams + 1).boxed().map(i -> "i" + i).collect(Collectors.toSet()), 036 IntStream.range(1, nbOutputStreams + 1).boxed().map(i -> "o" + i).collect(Collectors.toSet())); 037 } 038 039 @Override 040 public void init(ComputationContext context) { 041 042 } 043 044 @Override 045 public void processTimer(ComputationContext context, String key, long timestamp) { 046 047 } 048 049 @Override 050 public ComputationMetadata metadata() { 051 return metadata; 052 } 053}