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ksql-rest-app/src/main/java/io/confluent/ksql/rest/server/ProducerTransactionManager.java
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| /* | ||
| * Copyright 2019 Confluent Inc. | ||
| * | ||
| * Licensed under the Confluent Community License (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.confluent.io/confluent-community-license | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OF ANY KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations under the License. | ||
| */ | ||
|
|
||
| package io.confluent.ksql.rest.server; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import io.confluent.ksql.rest.entity.CommandId; | ||
| import io.confluent.ksql.rest.server.computation.Command; | ||
| import io.confluent.ksql.rest.server.computation.CommandRunner; | ||
| import io.confluent.ksql.rest.util.InternalTopicJsonSerdeUtil; | ||
| import java.util.Collections; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.ExecutionException; | ||
| import org.apache.kafka.clients.consumer.Consumer; | ||
| import org.apache.kafka.clients.consumer.KafkaConsumer; | ||
| import org.apache.kafka.clients.producer.KafkaProducer; | ||
| import org.apache.kafka.clients.producer.Producer; | ||
| import org.apache.kafka.clients.producer.ProducerRecord; | ||
| import org.apache.kafka.clients.producer.RecordMetadata; | ||
| import org.apache.kafka.common.KafkaException; | ||
| import org.apache.kafka.common.TopicPartition; | ||
|
|
||
| /** | ||
| * Used to handle transactional writes to the command topic | ||
| */ | ||
| public class ProducerTransactionManager { | ||
|
|
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| private final TopicPartition commandTopicPartition; | ||
| private final String commandTopicName; | ||
|
|
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| private final Consumer<CommandId, Command> commandConsumer; | ||
| private final Producer<CommandId, Command> commandProducer; | ||
| private final CommandRunner commandRunner; | ||
|
|
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| public ProducerTransactionManager( | ||
| final String commandTopicName, | ||
| final CommandRunner commandRunner, | ||
| final Map<String, Object> kafkaConsumerProperties, | ||
| final Map<String, Object> kafkaProducerProperties | ||
| ) { | ||
| this.commandTopicPartition = new TopicPartition( | ||
| Objects.requireNonNull(commandTopicName, "commandTopicName"), | ||
| 0 | ||
| ); | ||
|
|
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| this.commandConsumer = new KafkaConsumer<>( | ||
| Objects.requireNonNull(kafkaConsumerProperties, "kafkaConsumerProperties"), | ||
| InternalTopicJsonSerdeUtil.getJsonDeserializer(CommandId.class, true), | ||
| InternalTopicJsonSerdeUtil.getJsonDeserializer(Command.class, false) | ||
| ); | ||
|
|
||
| this.commandProducer = new KafkaProducer<>( | ||
| Objects.requireNonNull(kafkaProducerProperties, "kafkaProducerProperties"), | ||
| InternalTopicJsonSerdeUtil.getJsonSerializer(true), | ||
| InternalTopicJsonSerdeUtil.getJsonSerializer(false) | ||
| ); | ||
| this.commandTopicName = Objects.requireNonNull(commandTopicName, "commandTopicName"); | ||
| this.commandRunner = Objects.requireNonNull(commandRunner, "commandRunner"); | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| ProducerTransactionManager( | ||
| final String commandTopicName, | ||
| final CommandRunner commandRunner, | ||
| final Consumer<CommandId, Command> commandConsumer, | ||
| final Producer<CommandId, Command> commandProducer | ||
| ) { | ||
| this.commandTopicPartition = new TopicPartition( | ||
| Objects.requireNonNull(commandTopicName, "commandTopicName"), | ||
| 0 | ||
| ); | ||
| this.commandConsumer = Objects.requireNonNull(commandConsumer, "commandConsumer"); | ||
| this.commandProducer = Objects.requireNonNull(commandProducer, "commandProducer"); | ||
| this.commandTopicName = Objects.requireNonNull(commandTopicName, "commandTopicName"); | ||
| this.commandRunner = Objects.requireNonNull(commandRunner, "commandRunner"); | ||
| } | ||
|
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||
|
|
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| /** begins transaction */ | ||
| public void begin() { | ||
| commandConsumer.assign(Collections.singleton(commandTopicPartition)); | ||
| commandProducer.initTransactions(); | ||
| commandProducer.beginTransaction(); | ||
| } | ||
|
|
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| public void waitForCommandRunner() { | ||
| final long endOffset = getEndOffset(); | ||
|
|
||
| try { | ||
| int retries = 0; | ||
| while (commandRunner.getNumCommandProcessed() < endOffset) { | ||
| Thread.sleep(1000); | ||
|
|
||
| if (retries == 60) { | ||
| throw new RuntimeException("commandRunner has not processed all commands in topic"); | ||
| } | ||
| retries++; | ||
| } | ||
| } catch (Exception exception) { | ||
| throw new RuntimeException( | ||
| "Error while waiting for commandRunner to process command topic:", | ||
| exception | ||
| ); | ||
| } | ||
| } | ||
|
|
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| private long getEndOffset() { | ||
| return commandConsumer.endOffsets(Collections.singletonList(commandTopicPartition)) | ||
| .get(commandTopicPartition); | ||
| } | ||
|
|
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| public RecordMetadata send(final CommandId commandId, final Command command) { | ||
| final ProducerRecord<CommandId, Command> producerRecord = new ProducerRecord<>( | ||
| commandTopicName, | ||
| 0, | ||
| Objects.requireNonNull(commandId, "commandId"), | ||
| Objects.requireNonNull(command, "command")); | ||
| try { | ||
| return commandProducer.send(producerRecord).get(); | ||
| } catch (final ExecutionException e) { | ||
| if (e.getCause() instanceof RuntimeException) { | ||
| throw (RuntimeException) e.getCause(); | ||
| } | ||
| throw new RuntimeException(e.getCause()); | ||
| } catch (final InterruptedException e) { | ||
| throw new RuntimeException(e); | ||
| } catch (KafkaException e) { | ||
| commandProducer.abortTransaction(); | ||
| throw new KafkaException(e); | ||
| } | ||
| } | ||
|
|
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| public void abort() { | ||
| commandProducer.abortTransaction(); | ||
| close(); | ||
|
|
||
| } | ||
|
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| public void commit() { | ||
| commandProducer.commitTransaction(); | ||
| close(); | ||
| } | ||
|
|
||
| public void close() { | ||
| commandConsumer.close(); | ||
| commandProducer.close(); | ||
| } | ||
| } |
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