apoorvmittal10 commented on code in PR #16860: URL: https://github.com/apache/kafka/pull/16860#discussion_r1713881944
########## tools/src/main/java/org/apache/kafka/tools/consumer/ConsoleShareConsumer.java: ########## @@ -0,0 +1,185 @@ +/* + * 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.tools.consumer; + +import org.apache.kafka.clients.consumer.AcknowledgeType; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.KafkaShareConsumer; +import org.apache.kafka.clients.consumer.ShareConsumer; +import org.apache.kafka.common.MessageFormatter; +import org.apache.kafka.common.errors.AuthenticationException; +import org.apache.kafka.common.errors.TimeoutException; +import org.apache.kafka.common.errors.WakeupException; +import org.apache.kafka.common.serialization.ByteArrayDeserializer; +import org.apache.kafka.common.utils.Exit; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.PrintStream; +import java.time.Duration; +import java.util.Collections; +import java.util.Iterator; +import java.util.Optional; +import java.util.concurrent.CountDownLatch; + + +/** + * Share Consumer that dumps messages to standard out. + */ +public class ConsoleShareConsumer { + + private static final Logger LOG = LoggerFactory.getLogger(ConsoleShareConsumer.class); + private static final CountDownLatch SHUTDOWN_LATCH = new CountDownLatch(1); + + static int messageCount = 0; + + public static void main(String[] args) throws Exception { + ConsoleShareConsumerOptions opts = new ConsoleShareConsumerOptions(args); + try { + run(opts); + } catch (AuthenticationException ae) { + LOG.error("Authentication failed: terminating consumer process", ae); + Exit.exit(1); + } catch (Throwable t) { + LOG.error("Unknown error when running consumer: ", t); + Exit.exit(1); + } + } + + public static void run(ConsoleShareConsumerOptions opts) { + messageCount = 0; + long timeoutMs = opts.timeoutMs() >= 0 ? opts.timeoutMs() : Long.MAX_VALUE; + + ShareConsumer<byte[], byte[]> consumer = new KafkaShareConsumer<>(opts.consumerProps(), new ByteArrayDeserializer(), new ByteArrayDeserializer()); + ConsumerWrapper consumerWrapper = new ConsumerWrapper(opts.topicArg(), consumer, timeoutMs); + + addShutdownHook(consumerWrapper); + + try { + process(opts.maxMessages(), opts.formatter(), consumerWrapper, System.out, opts.rejectMessageOnError(), opts.acknowledgeType()); + } finally { + consumerWrapper.cleanup(); + opts.formatter().close(); + reportRecordCount(); + + SHUTDOWN_LATCH.countDown(); + } + } + + static void addShutdownHook(ConsumerWrapper consumer) { + Exit.addShutdownHook("consumer-shutdown-hook", () -> { + try { + consumer.wakeup(); + SHUTDOWN_LATCH.await(); + } catch (Throwable t) { + LOG.error("Exception while running shutdown hook: ", t); + } + }); + } + + static void process(int maxMessages, MessageFormatter formatter, ConsumerWrapper consumer, PrintStream output, + boolean rejectMessageOnError, AcknowledgeType acknowledgeType) { + while (messageCount < maxMessages || maxMessages == -1) { + ConsumerRecord<byte[], byte[]> msg; + try { + msg = consumer.receive(); + } catch (WakeupException we) { + LOG.trace("Caught WakeupException because consumer is shutdown, ignore and terminate."); + // Consumer will be closed + return; + } catch (Throwable t) { + LOG.error("Error processing message, terminating consumer process: ", t); + // Consumer will be closed + return; + } + messageCount += 1; + try { + formatter.writeTo(new ConsumerRecord<>(msg.topic(), msg.partition(), msg.offset(), msg.timestamp(), msg.timestampType(), + 0, 0, msg.key(), msg.value(), msg.headers(), Optional.empty()), output); + consumer.acknowledge(msg, acknowledgeType); + } catch (Throwable t) { + if (rejectMessageOnError) { + LOG.error("Error processing message, skipping this message: ", t); + consumer.acknowledge(msg, AcknowledgeType.REJECT); + } else { + // Consumer will be closed + throw t; + } + } + if (checkErr(output)) { + // Consumer will be closed + return; + } + } + } + + static void reportRecordCount() { Review Comment: Can it be private, seems we never use it in tests? And same for other methods. -- 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
