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 * Taken from https://github.com/concord/concord-jvm 018 */ 019package org.nuxeo.lib.stream.computation; 020 021import java.util.Collections; 022import java.util.Objects; 023import java.util.Set; 024import java.util.stream.Collectors; 025 026/** 027 * The metadata defining a computation. 028 * 029 * @since 9.3 030 */ 031public class ComputationMetadata { 032 protected final String name; 033 034 protected final Set<String> inputStreams; 035 036 protected final Set<String> outputStreams; 037 038 public ComputationMetadata(String name, Set<String> inputStreams, Set<String> outputStreams) { 039 this.name = Objects.requireNonNull(name); 040 041 if (inputStreams == null) { 042 this.inputStreams = Collections.emptySet(); 043 } else { 044 this.inputStreams = inputStreams; 045 } 046 if (outputStreams == null) { 047 this.outputStreams = Collections.emptySet(); 048 } else { 049 this.outputStreams = outputStreams; 050 } 051 052 if (this.inputStreams.isEmpty() && this.outputStreams.isEmpty()) { 053 throw new RuntimeException("Both input and output streams are empty"); 054 } 055 } 056 057 /** 058 * Globally unique identifier of the computation. 059 */ 060 public String name() { 061 return name; 062 } 063 064 /** 065 * List of streams to subscribe this computation to. 066 */ 067 public Set<String> inputStreams() { 068 return inputStreams; 069 } 070 071 /** 072 * List of streams this computation may produce on. 073 */ 074 public Set<String> outputStreams() { 075 return outputStreams; 076 } 077 078 @Override 079 public boolean equals(Object o) { 080 if (this == o) 081 return true; 082 if (o == null || getClass() != o.getClass()) 083 return false; 084 085 ComputationMetadata metadata = (ComputationMetadata) o; 086 087 return name.equals(metadata.name) && inputStreams.equals(metadata.inputStreams) 088 && outputStreams.equals(metadata.outputStreams); 089 } 090 091 @Override 092 public int hashCode() { 093 int result = name.hashCode(); 094 result = 31 * result + inputStreams.hashCode(); 095 result = 31 * result + outputStreams.hashCode(); 096 return result; 097 } 098 099 @Override 100 public String toString() { 101 return "ComputationMetadata{" + "name='" + name + '\'' + ", inputStreams=" 102 + inputStreams.stream().collect(Collectors.joining(",")) + ", outputStreams=" 103 + outputStreams.stream().collect(Collectors.joining(",")) + '}'; 104 } 105}