FlakyKafkaProducer.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 gobblin.kafka;

import java.util.Properties;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

import gobblin.test.ErrorManager;


/**
 * A Flaky Kafka Producer that wraps a real KafkaProducer.
 * Can be configured to throw errors selectively instead of writing to Kafka
 */
public class FlakyKafkaProducer<K,V> extends KafkaProducer<K,V> {


  private final Future<RecordMetadata> nullFuture = new Future<RecordMetadata>() {
    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
      return false;
    }

    @Override
    public boolean isCancelled() {
      return false;
    }

    @Override
    public boolean isDone() {
      return false;
    }

    @Override
    public RecordMetadata get()
        throws InterruptedException, ExecutionException {
      return null;
    }

    @Override
    public RecordMetadata get(long timeout, TimeUnit unit)
        throws InterruptedException, ExecutionException, TimeoutException {
      return null;
    }
  };

  private final ErrorManager<V> errorManager;

  public FlakyKafkaProducer(Properties properties) {
    super(properties);
    Config config = ConfigFactory.parseProperties(properties);
    errorManager = new ErrorManager(config);
  }

  @Override
  public Future<RecordMetadata> send(ProducerRecord<K, V> record) {
    return send(record, null);
  }

  @Override
  public Future<RecordMetadata> send(ProducerRecord<K, V> record, final Callback callback) {
    boolean error = errorManager.nextError(record.value());
    if (errorManager.nextError(record.value()))
    {
      final Exception e = new Exception();
      callback.onCompletion(null, e);
      return nullFuture;
    }
    else {
      return super.send(record, callback);
    }

  }

}