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 io.jafka.api.FetchRequest;
  import io.jafka.common.ErrorMapping;
  import io.jafka.common.annotations.ClientSide;
  import io.jafka.common.annotations.ThreadSafe;
  import io.jafka.message.ByteBufferMessageSet;
  import io.jafka.network.BlockingChannel;
  import io.jafka.network.Receive;
  import io.jafka.network.Request;
  import io.jafka.utils.KV;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.net.ConnectException;
  import java.net.SocketTimeoutException;
  import java.nio.channels.ClosedByInterruptException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.locks.LockSupport;
  
  /**
   * Simple operation with jafka broker
   *
   * @author adyliu (imxylz@gmail.com)
   * @since 1.2
   */
  @ThreadSafe
  @ClientSide
  public class SimpleOperation implements Closeable {
  
      private final Logger logger = LoggerFactory.getLogger(SimpleOperation.class);
  
      ////////////////////////////////
      private final BlockingChannel blockingChannel;
  
      private final Object lock = new Object();
  
      public SimpleOperation(String host, int port) {
          this(host, port, 30 * 1000, 64 * 1024);
      }
  
      public SimpleOperation(String host, int port, int soTimeout, int bufferSize) {
          blockingChannel = new BlockingChannel(host, port, bufferSize, BlockingChannel.DEFAULT_BUFFER_SIZE, soTimeout);
      }
  
      private BlockingChannel connect() throws IOException {
          close();
          blockingChannel.connect();
          return blockingChannel;
      }
  
      private void disconnect() {
          if (blockingChannel.isConnected()) {
              blockingChannel.disconnect();
          }
      }
  
      public void close() {
          synchronized (lock) {
              blockingChannel.disconnect();
          }
      }
  
      private void reconnect() throws IOException {
          disconnect();
          connect();
      }
  
  
      private void getOrMakeConnection() throws IOException {
          if (!blockingChannel.isConnected()) {
              connect();
          }
      }
  
  
      public KV<Receive, ErrorMapping> send(Request request) throws IOException {
          synchronized (lock) {
              getOrMakeConnection();
              try {
                  blockingChannel.send(request);
                  return blockingChannel.receive();
              } catch (ClosedByInterruptException cbie) {
                  logger.info("receive interrupted");
                  throw cbie;
              } catch (IOException e) {
                  logger.info("Reconnect in fetch request due to socket error: {}", e.getMessage());
                  //retry once
                  try {
                      reconnect();
                      blockingChannel.send(request);
                      return blockingChannel.receive();
                  } catch (SocketTimeoutException ste){
                      logger.error("Reconnect fail and recur now: {}",ste.getMessage());
                      LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(1));
                      return send(request);
                  }
                  catch (ConnectException ce){
                      logger.error("Reconnect fail and recur now: {}",ce.getMessage());
                      LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(1));
                      return send(request);
                  }
                  catch (IOException e2) {
                      throw e2;
                  }
              }
          }
      }
  
      public ByteBufferMessageSet fetch(FetchRequest request) throws IOException {
          KV<Receive, ErrorMapping> response = send(request);
          return new ByteBufferMessageSet(response.k.buffer(), request.offset, response.v);
      }
  
  
  }
  