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