kafka ListOffsetsResult 源码
kafka ListOffsetsResult 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/admin/ListOffsetsResult.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.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
import org.apache.kafka.common.KafkaFuture;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.annotation.InterfaceStability;
/**
* The result of the {@link AdminClient#listOffsets(Map)} call.
*
* The API of this class is evolving, see {@link AdminClient} for details.
*/
@InterfaceStability.Evolving
public class ListOffsetsResult {
private final Map<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> futures;
public ListOffsetsResult(Map<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> futures) {
this.futures = futures;
}
/**
* Return a future which can be used to check the result for a given partition.
*/
public KafkaFuture<ListOffsetsResultInfo> partitionResult(final TopicPartition partition) {
KafkaFuture<ListOffsetsResultInfo> future = futures.get(partition);
if (future == null) {
throw new IllegalArgumentException(
"List Offsets for partition \"" + partition + "\" was not attempted");
}
return future;
}
/**
* Return a future which succeeds only if offsets for all specified partitions have been successfully
* retrieved.
*/
public KafkaFuture<Map<TopicPartition, ListOffsetsResultInfo>> all() {
return KafkaFuture.allOf(futures.values().toArray(new KafkaFuture[0]))
.thenApply(new KafkaFuture.BaseFunction<Void, Map<TopicPartition, ListOffsetsResultInfo>>() {
@Override
public Map<TopicPartition, ListOffsetsResultInfo> apply(Void v) {
Map<TopicPartition, ListOffsetsResultInfo> offsets = new HashMap<>(futures.size());
for (Map.Entry<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> entry : futures.entrySet()) {
try {
offsets.put(entry.getKey(), entry.getValue().get());
} catch (InterruptedException | ExecutionException e) {
// This should be unreachable, because allOf ensured that all the futures completed successfully.
throw new RuntimeException(e);
}
}
return offsets;
}
});
}
public static class ListOffsetsResultInfo {
private final long offset;
private final long timestamp;
private final Optional<Integer> leaderEpoch;
public ListOffsetsResultInfo(long offset, long timestamp, Optional<Integer> leaderEpoch) {
this.offset = offset;
this.timestamp = timestamp;
this.leaderEpoch = leaderEpoch;
}
public long offset() {
return offset;
}
public long timestamp() {
return timestamp;
}
public Optional<Integer> leaderEpoch() {
return leaderEpoch;
}
@Override
public String toString() {
return "ListOffsetsResultInfo(offset=" + offset + ", timestamp=" + timestamp + ", leaderEpoch="
+ leaderEpoch + ")";
}
}
}
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