jiazhai commented on a change in pull request #4911: expose getLastMessageId method in ConsumerImpl URL: https://github.com/apache/pulsar/pull/4911#discussion_r313306254
########## File path: pulsar-client/src/main/java/org/apache/pulsar/client/impl/MultiMessageIdImpl.java ########## @@ -0,0 +1,111 @@ +/** + * 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.pulsar.client.impl; + +import java.util.Map; +import java.util.Map.Entry; +import java.util.Objects; +import lombok.Getter; +import org.apache.pulsar.client.api.MessageId; +import sun.reflect.generics.reflectiveObjects.NotImplementedException; + +/** + * A MessageId implementation that contains a map of <partitionName, MessageId>. + * This is useful when MessageId is need for partition/multi-topics/pattern consumer. + * e.g. seek(), ackCumulative(), getLastMessageId(). + */ +public class MultiMessageIdImpl implements MessageId { + @Getter + private Map<String, MessageId> map; + + MultiMessageIdImpl(Map<String, MessageId> map) { + this.map = map; + } + + // TODO: Add support for Serialization and Deserialization + // https://github.com/apache/pulsar/issues/4940 + @Override + public byte[] toByteArray() { + throw new NotImplementedException(); + } + + @Override + public int hashCode() { + return Objects.hash(map); + } + + // If all messageId in map are same size, and all bigger/smaller than the other, return valid value. + @Override + public int compareTo(MessageId o) { + if (!(o instanceof MultiMessageIdImpl)) { + throw new IllegalArgumentException( + "expected MultiMessageIdImpl object. Got instance of " + o.getClass().getName()); + } + + MultiMessageIdImpl other = (MultiMessageIdImpl) o; + Map<String, MessageId> otherMap = other.getMap(); + + if ((map == null || map.isEmpty()) && (otherMap == null || otherMap.isEmpty())) { + return 0; + } + + if (otherMap == null || map == null || otherMap.size() != map.size()) { + throw new IllegalArgumentException("Current size and other size not equals"); + } + + int result = 0; + for (Entry<String, MessageId> entry : map.entrySet()) { + MessageId otherMessage = otherMap.get(entry.getKey()); + if (otherMessage == null) { + throw new IllegalArgumentException( + "Other MessageId not have topic " + entry.getKey()); + } + + int currentResult = entry.getValue().compareTo(otherMessage); + if (result == 0) { + result = currentResult; Review comment: 1. result == 0 && currentResult ==0, then this reset has no effect. 2. result ==0 && currentResult !=0, then we keep the non-zero result, this is the result that may be finally returned. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
