kafka AddNamedTopologyResult 源码
kafka AddNamedTopologyResult 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/internals/namedtopology/AddNamedTopologyResult.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.processor.internals.namedtopology;
import org.apache.kafka.common.KafkaFuture;
import org.apache.kafka.streams.errors.StreamsException;
import java.util.concurrent.ExecutionException;
public class AddNamedTopologyResult {
private final KafkaFuture<Void> addTopologyFuture;
public AddNamedTopologyResult(final KafkaFuture<Void> addTopologyFuture) {
this.addTopologyFuture = addTopologyFuture;
}
/**
* @return a {@link KafkaFuture} that completes successfully when all threads on this client have picked up the
* new {@link NamedTopology}. Note that the new topology is not guaranteed to begin processing on this client or
* any others until its addition has been completed by all instances of the application.
*/
public KafkaFuture<Void> all() {
return addTopologyFuture;
}
/**
* Boiler plate to get the root cause as a StreamsException if completed exceptionally, otherwise returns {@code null}.
* Non-blocking.
*/
public StreamsException exceptionNow() {
try {
addTopologyFuture.getNow(null);
return null;
} catch (final ExecutionException e) {
if (e.getCause() instanceof StreamsException) {
return (StreamsException) e.getCause();
} else {
return new StreamsException(e.getCause());
}
} catch (final InterruptedException e) {
return null;
}
}
}
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