/*
    * 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.logging.log4j.core.appender.mom.kafka;
  
  import java.util.Properties;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  import org.apache.kafka.clients.producer.Producer;
  import org.apache.kafka.clients.producer.ProducerRecord;
  import org.apache.logging.log4j.core.LoggerContext;
  import org.apache.logging.log4j.core.appender.AbstractManager;
  import org.apache.logging.log4j.core.config.Property;
  
  public class KafkaManager extends AbstractManager {
  
      public static final String DEFAULT_TIMEOUT_MILLIS = "30000";
  
      /**
       * package-private access for testing.
       */
      static KafkaProducerFactory producerFactory = new DefaultKafkaProducerFactory();
  
      private final Properties config = new Properties();
      private Producer<byte[], byte[]> producer;
      private final int timeoutMillis;
  
      private final String topic;
  
      public KafkaManager(final LoggerContext loggerContext, final String name, final String topic, final Property[] properties) {
          super(loggerContext, name);
          this.topic = topic;
          config.setProperty("key.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");
          config.setProperty("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");
          config.setProperty("batch.size", "0");
          for (final Property property : properties) {
              config.setProperty(property.getName(), property.getValue());
          }
          this.timeoutMillis = Integer.parseInt(config.getProperty("timeout.ms", DEFAULT_TIMEOUT_MILLIS));
      }
  
      @Override
      public boolean releaseSub(final long timeout, final TimeUnit timeUnit) {
          if (timeout > 0) {
              closeProducer(timeout, timeUnit);
          } else {
              closeProducer(timeoutMillis, TimeUnit.MILLISECONDS);
          }
          return true;
      }
  
      private void closeProducer(final long timeout, final TimeUnit timeUnit) {
          if (producer != null) {
              // This thread is a workaround for this Kafka issue: https://issues.apache.org/jira/browse/KAFKA-1660
              final Runnable task = new Runnable() {
                  @Override
                  public void run() {
                      if (producer != null) {
                          producer.close();
                      }
                  }
              };
              try {
                  getLoggerContext().submitDaemon(task).get(timeout, timeUnit);
              } catch (InterruptedException | ExecutionException | TimeoutException e) {
                  // ignore
              }
          }
      }
  
      public void send(final byte[] msg) throws ExecutionException, InterruptedException, TimeoutException {
          if (producer != null) {
              producer.send(new ProducerRecord<byte[], byte[]>(topic, msg)).get(timeoutMillis, TimeUnit.MILLISECONDS);
          }
      }
  
      public void startup() {
          producer = producerFactory.newKafkaProducer(config);
      }
  
      public String getTopic() {
          return topic;
      }
 
 }