kafka OffsetSpec 源码
kafka OffsetSpec 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/admin/OffsetSpec.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.clients.admin;
import java.util.Map;
/**
* This class allows to specify the desired offsets when using {@link KafkaAdminClient#listOffsets(Map, ListOffsetsOptions)}
*/
public class OffsetSpec {
public static class EarliestSpec extends OffsetSpec { }
public static class LatestSpec extends OffsetSpec { }
public static class MaxTimestampSpec extends OffsetSpec { }
public static class TimestampSpec extends OffsetSpec {
private final long timestamp;
TimestampSpec(long timestamp) {
this.timestamp = timestamp;
}
long timestamp() {
return timestamp;
}
}
/**
* Used to retrieve the latest offset of a partition
*/
public static OffsetSpec latest() {
return new LatestSpec();
}
/**
* Used to retrieve the earliest offset of a partition
*/
public static OffsetSpec earliest() {
return new EarliestSpec();
}
/**
* Used to retrieve the earliest offset whose timestamp is greater than
* or equal to the given timestamp in the corresponding partition
* @param timestamp in milliseconds
*/
public static OffsetSpec forTimestamp(long timestamp) {
return new TimestampSpec(timestamp);
}
/**
* Used to retrieve the offset with the largest timestamp of a partition
* as message timestamps can be specified client side this may not match
* the log end offset returned by LatestSpec
*/
public static OffsetSpec maxTimestamp() {
return new MaxTimestampSpec();
}
}
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