content: /**
   * 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 io.jafka.consumer;
  
  import com.github.zkclient.ZkClient;
  import io.jafka.api.FetchRequest;
  import io.jafka.api.MultiFetchResponse;
  import io.jafka.api.OffsetRequest;
  import io.jafka.cluster.Broker;
  import io.jafka.cluster.Partition;
  import io.jafka.common.ErrorMapping;
  import io.jafka.common.annotations.ClientSide;
  import io.jafka.message.ByteBufferMessageSet;
  import io.jafka.utils.Closer;
  import io.jafka.utils.zookeeper.ZkGroupTopicDirs;
  import io.jafka.utils.zookeeper.ZkUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.nio.channels.ClosedByInterruptException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static java.lang.String.format;
  
  /**
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  @ClientSide
  public class FetcherRunnable extends Thread {
  
      private final CountDownLatch shutdownLatch = new CountDownLatch(1);
  
      private final SimpleConsumer simpleConsumer;
  
      private volatile boolean stopped = false;
  
      private final ConsumerConfig config;
  
      private final Broker broker;
  
      private final ZkClient zkClient;
  
      private final List<PartitionTopicInfo> partitionTopicInfos;
  
      private final Logger logger = LoggerFactory.getLogger(FetcherRunnable.class);
  
      private final static AtomicInteger threadIndex = new AtomicInteger(0);
  
      public FetcherRunnable(String name,//
                             ZkClient zkClient,//
                             ConsumerConfig config,//
                             Broker broker,//
                             List<PartitionTopicInfo> partitionTopicInfos) {
          super(name + "-" + threadIndex.getAndIncrement());
          this.zkClient = zkClient;
          this.config = config;
          this.broker = broker;
          this.partitionTopicInfos = partitionTopicInfos;
          this.simpleConsumer = new SimpleConsumer(broker.host, broker.port, config.getSocketTimeoutMs(),
                  config.getSocketBufferSize());
      }
  
      public void shutdown() throws InterruptedException {
          logger.info("shutdown the fetcher " + getName());
          stopped = true;
          interrupt();
          shutdownLatch.await(5, TimeUnit.SECONDS);
      }
  
      @Override
      public void run() {
          StringBuilder buf = new StringBuilder("[");
          for (PartitionTopicInfo pti : partitionTopicInfos) {
              buf.append(format("%s-%d-%d,", pti.topic, pti.partition.brokerId, pti.partition.partId));
          }
          buf.append(']');
          logger.info(String.format("%s comsume at %s:%d with %s", getName(), broker.host, broker.port, buf.toString()));
          //
          try {
              final long maxFetchBackoffMs = config.getMaxFetchBackoffMs();
              long fetchBackoffMs = config.getFetchBackoffMs();
              while (!stopped) {
                  if (fetchOnce() == 0) {//read empty bytes
                      if (logger.isDebugEnabled()) {
                          logger.debug("backing off " + fetchBackoffMs + " ms");
                      }
                      Thread.sleep(fetchBackoffMs);
                      if (fetchBackoffMs < maxFetchBackoffMs) {
                          fetchBackoffMs += fetchBackoffMs / 10;
                      }
                  } else {
                      fetchBackoffMs = config.getFetchBackoffMs();
                  }
              }
          } catch (ClosedByInterruptException cbie) {
              logger.info("FetcherRunnable " + this + " interrupted");
          } catch (Exception e) {
              if (stopped) {
                  logger.info("FetcherRunnable " + this + " interrupted");
              } else {
                  logger.error("error in FetcherRunnable ", e);
              }
          }
          //
          logger.debug("stopping fetcher " + getName() + " to broker " + broker);
          Closer.closeQuietly(simpleConsumer);
          shutdownComplete();
      }
  
      private long fetchOnce() throws IOException, InterruptedException {
          List<FetchRequest> fetches = new ArrayList<FetchRequest>();
          for (PartitionTopicInfo info : partitionTopicInfos) {
              fetches.add(new FetchRequest(info.topic, info.partition.partId, info.getFetchedOffset(), config
                      .getFetchSize()));
          }
          MultiFetchResponse response = simpleConsumer.multifetch(fetches);
          int index = 0;
          long read = 0L;
          for (ByteBufferMessageSet messages : response) {
              PartitionTopicInfo info = partitionTopicInfos.get(index);
              //
              try {
                  read += processMessages(messages, info);
              } catch (IOException e) {
                  throw e;
              } catch (InterruptedException e) {
                  if (!stopped) {
                      logger.error("error in FetcherRunnable for " + info, e);
                      info.enqueueError(e, info.getFetchedOffset());
                  }
                  throw e;
              } catch (RuntimeException e) {
                  if (!stopped) {
                      logger.error("error in FetcherRunnable for " + info, e);
                      info.enqueueError(e, info.getFetchedOffset());
                  }
                  throw e;
              }
  
              //
              index++;
          }
          return read;
      }
  
      private long processMessages(ByteBufferMessageSet messages, PartitionTopicInfo info) throws IOException,
              InterruptedException {
          boolean done = false;
          if (messages.getErrorCode() == ErrorMapping.OffsetOutOfRangeCode) {
              logger.warn("offset for " + info + " out of range, now we fix it");
              long resetOffset = resetConsumerOffsets(info.topic, info.partition);
              if (resetOffset >= 0) {
                  info.resetFetchOffset(resetOffset);
                  info.resetConsumeOffset(resetOffset);
                  done = true;
              }
          }
          if (!done) {
              return info.enqueue(messages, info.getFetchedOffset());
          }
          return 0;
      }
  
      private void shutdownComplete() {
          this.shutdownLatch.countDown();
      }
  
      private long resetConsumerOffsets(String topic, Partition partition) throws IOException {
          long offset = -1;
          String autoOffsetReset = config.getAutoOffsetReset();
          if (OffsetRequest.SMALLES_TIME_STRING.equals(autoOffsetReset)) {
              offset = OffsetRequest.EARLIES_TTIME;
          } else if (OffsetRequest.LARGEST_TIME_STRING.equals(autoOffsetReset)) {
              offset = OffsetRequest.LATES_TTIME;
          }
          //
          final ZkGroupTopicDirs topicDirs = new ZkGroupTopicDirs(config.getGroupId(), topic);
          long[] offsets = simpleConsumer.getOffsetsBefore(topic, partition.partId, offset, 1);
          //TODO: fixed no offsets?
          ZkUtils.updatePersistentPath(zkClient, topicDirs.consumerOffsetDir + "/" + partition.getName(), "" + offsets[0]);
          return offsets[0];
      }
  }
  