kirktrue commented on code in PR #14406: URL: https://github.com/apache/kafka/pull/14406#discussion_r1334870549
########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/events/BackgroundEventProcessor.java: ########## @@ -0,0 +1,103 @@ +/* + * 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.events; + +import org.apache.kafka.common.utils.LogContext; +import org.slf4j.Logger; + +import java.util.LinkedList; +import java.util.Objects; +import java.util.concurrent.BlockingQueue; + +public class BackgroundEventProcessor { + + private final Logger log; + private final BlockingQueue<BackgroundEvent> backgroundEventQueue; + + public BackgroundEventProcessor(final LogContext logContext, + final BlockingQueue<BackgroundEvent> backgroundEventQueue) { + this.log = logContext.logger(BackgroundEventProcessor.class); + this.backgroundEventQueue = backgroundEventQueue; + } + + /** + * Drains all available {@link BackgroundEvent}s, and then processes them in order. If any + * errors are thrown as a result of a {@link ErrorBackgroundEvent} or an error occurs while processing + * another type of {@link BackgroundEvent}, only the <em>first</em> exception will be thrown, all + * subsequent errors will simply be logged at <code>WARN</code> level. + * + * @throws RuntimeException or subclass + */ + public void process() { + LinkedList<BackgroundEvent> events = new LinkedList<>(); + backgroundEventQueue.drainTo(events); + + RuntimeException first = null; + int errorCount = 0; + + for (BackgroundEvent event : events) { + log.debug("Consuming background event: {}", event); + + try { + process(event); + } catch (RuntimeException e) { + errorCount++; + + if (first == null) { + first = e; + log.warn("Error #{} from background thread (will be logged and thrown): {}", errorCount, e.getMessage(), e); Review Comment: Sorry, can you elaborate? Where is the error logged other than this? -- 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: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
