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KafkaResourceHolder.java
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KafkaResourceHolder.java
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/*
* Copyright 2017-2019 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.kafka.core;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import org.apache.kafka.clients.producer.Producer;
import org.springframework.transaction.support.ResourceHolderSupport;
import org.springframework.util.Assert;
/**
* Kafka resource holder, wrapping a Kafka producer. KafkaTransactionManager binds instances of this
* class to the thread, for a given Kafka producer factory.
*
* @param <K> the key type.
* @param <V> the value type.
*
* @author Gary Russell
*/
public class KafkaResourceHolder<K, V> extends ResourceHolderSupport {
private final Producer<K, V> producer;
private final Duration closeTimeout;
/**
* Construct an instance for the producer.
* @param producer the producer.
*/
public KafkaResourceHolder(Producer<K, V> producer) {
this(producer, ProducerFactoryUtils.DEFAULT_CLOSE_TIMEOUT);
}
/**
* Construct an instance for the producer.
* @param producer the producer.
* @param closeTimeout the close timeout.
* @deprecated in favor of {@link #KafkaResourceHolder(Producer, Duration)}
* @since 1.3.11
*/
@Deprecated
public KafkaResourceHolder(Producer<K, V> producer, long closeTimeout) {
Assert.notNull(producer, "'producer' cannot be null");
Assert.notNull(closeTimeout, "'closeTimeout' cannot be null");
this.producer = producer;
this.closeTimeout = Duration.ofMillis(closeTimeout);
}
/**
* Construct an instance for the producer.
* @param producer the producer.
* @param closeTimeout the close timeout.
*/
public KafkaResourceHolder(Producer<K, V> producer, Duration closeTimeout) {
Assert.notNull(producer, "'producer' cannot be null");
Assert.notNull(closeTimeout, "'closeTimeout' cannot be null");
this.producer = producer;
this.closeTimeout = closeTimeout;
}
public Producer<K, V> getProducer() {
return this.producer;
}
public void commit() {
this.producer.commitTransaction();
}
public void close() {
this.producer.close(this.closeTimeout.toMillis(), TimeUnit.MILLISECONDS);
}
public void rollback() {
this.producer.abortTransaction();
}
}