lucasbru commented on code in PR #20511: URL: https://github.com/apache/kafka/pull/20511#discussion_r2349320450
########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsRebalanceListenerInvoker.java: ########## @@ -0,0 +1,120 @@ +/* + * 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.consumer.internals; + +import org.apache.kafka.common.errors.InterruptException; +import org.apache.kafka.common.errors.WakeupException; +import org.apache.kafka.common.utils.LogContext; + +import org.slf4j.Logger; + +import java.util.Objects; +import java.util.Optional; +import java.util.Set; + +/** + * This class encapsulates the invocation of the callback methods defined in the {@link StreamsRebalanceListener} + * interface. When streams group task assignment changes, these methods are invoked. This class wraps those + * callback calls with some logging and error handling. + */ +public class StreamsRebalanceListenerInvoker { + + private final Logger log; + + private final StreamsRebalanceData streamsRebalanceData; + private Optional<StreamsRebalanceListener> listener; + + StreamsRebalanceListenerInvoker(LogContext logContext, StreamsRebalanceData streamsRebalanceData) { + this.log = logContext.logger(getClass()); + this.listener = Optional.empty(); + this.streamsRebalanceData = streamsRebalanceData; + } + + public void setRebalanceListener(StreamsRebalanceListener streamsRebalanceListener) { + Objects.requireNonNull(streamsRebalanceListener, "StreamsRebalanceListener cannot be null"); + if (listener.isPresent() && listener.get() != streamsRebalanceListener) { + throw new IllegalStateException("StreamsRebalanceListener can only be set once"); Review Comment: Streams will always use the same rebalance listener to subscribe -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
