kafka FutureRecordMetadata 源码
kafka FutureRecordMetadata 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/producer/internals/FutureRecordMetadata.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.producer.internals;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.utils.Time;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* The future result of a record send
*/
public final class FutureRecordMetadata implements Future<RecordMetadata> {
private final ProduceRequestResult result;
private final int batchIndex;
private final long createTimestamp;
private final int serializedKeySize;
private final int serializedValueSize;
private final Time time;
private volatile FutureRecordMetadata nextRecordMetadata = null;
public FutureRecordMetadata(ProduceRequestResult result, int batchIndex, long createTimestamp, int serializedKeySize,
int serializedValueSize, Time time) {
this.result = result;
this.batchIndex = batchIndex;
this.createTimestamp = createTimestamp;
this.serializedKeySize = serializedKeySize;
this.serializedValueSize = serializedValueSize;
this.time = time;
}
@Override
public boolean cancel(boolean interrupt) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public RecordMetadata get() throws InterruptedException, ExecutionException {
this.result.await();
if (nextRecordMetadata != null)
return nextRecordMetadata.get();
return valueOrError();
}
@Override
public RecordMetadata get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
// Handle overflow.
long now = time.milliseconds();
long timeoutMillis = unit.toMillis(timeout);
long deadline = Long.MAX_VALUE - timeoutMillis < now ? Long.MAX_VALUE : now + timeoutMillis;
boolean occurred = this.result.await(timeout, unit);
if (!occurred)
throw new TimeoutException("Timeout after waiting for " + timeoutMillis + " ms.");
if (nextRecordMetadata != null)
return nextRecordMetadata.get(deadline - time.milliseconds(), TimeUnit.MILLISECONDS);
return valueOrError();
}
/**
* This method is used when we have to split a large batch in smaller ones. A chained metadata will allow the
* future that has already returned to the users to wait on the newly created split batches even after the
* old big batch has been deemed as done.
*/
void chain(FutureRecordMetadata futureRecordMetadata) {
if (nextRecordMetadata == null)
nextRecordMetadata = futureRecordMetadata;
else
nextRecordMetadata.chain(futureRecordMetadata);
}
RecordMetadata valueOrError() throws ExecutionException {
RuntimeException exception = this.result.error(batchIndex);
if (exception != null)
throw new ExecutionException(exception);
else
return value();
}
RecordMetadata value() {
if (nextRecordMetadata != null)
return nextRecordMetadata.value();
return new RecordMetadata(result.topicPartition(), this.result.baseOffset(), this.batchIndex,
timestamp(), this.serializedKeySize, this.serializedValueSize);
}
private long timestamp() {
return result.hasLogAppendTime() ? result.logAppendTime() : createTimestamp;
}
@Override
public boolean isDone() {
if (nextRecordMetadata != null)
return nextRecordMetadata.isDone();
return this.result.completed();
}
}
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