kafka TaskMetadata 源码
kafka TaskMetadata 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/TaskMetadata.java
/*
* 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.kafka.streams;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.streams.processor.TaskId;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
/**
* Metadata of a task.
*/
public interface TaskMetadata {
/**
* Task ID of the task.
*
* @return task ID consisting of subtopology and partition ID
*/
TaskId taskId();
/**
* Source topic partitions of the task.
*
* @return source topic partitions
*/
Set<TopicPartition> topicPartitions();
/**
* Offsets of the source topic partitions committed so far by the task.
*
* @return map from source topic partitions to committed offsets
*/
Map<TopicPartition, Long> committedOffsets();
/**
* End offsets of the source topic partitions of the task.
*
* @return map source topic partition to end offsets
*/
Map<TopicPartition, Long> endOffsets();
/**
* Time task idling started. If the task is not currently idling it will return empty.
*
* @return time when task idling started, empty {@code Optional} if the task is currently not idling
*/
Optional<Long> timeCurrentIdlingStarted();
/**
* Compares the specified object with this TaskMetadata. Returns {@code true} if and only if the specified object is
* also a TaskMetadata and both {@code taskId()} and {@code topicPartitions()} are equal.
*
* @return {@code true} if this object is the same as the obj argument; {@code false} otherwise.
*/
boolean equals(final Object o);
/**
* Returns the hash code value for this TaskMetadata. The hash code of a list is defined to be the result of the following calculation:
* <pre>
* {@code
* Objects.hash(taskId(), topicPartitions());
* }
* </pre>
*
* @return a hash code value for this object.
*/
int hashCode();
}
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