content: /*
   * Copyright (C) 2018 Facebook, Inc.
   *
   * Licensed 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.airlift.drift.transport.netty.codec;
  
  import io.airlift.drift.TException;
  import io.airlift.drift.protocol.TMessage;
  import io.airlift.drift.protocol.TProtocol;
  import io.airlift.drift.transport.netty.ssl.TChannelBufferInputTransport;
  import io.netty.buffer.ByteBuf;
  
  import java.util.Optional;
  
  import static java.util.Objects.requireNonNull;
  
  public class SimpleFrameInfoDecoder
          implements FrameInfoDecoder
  {
      private final Transport transportType;
      private final Protocol protocolType;
      private final boolean assumeClientsSupportOutOfOrderResponses;
  
      public SimpleFrameInfoDecoder(Transport transportType, Protocol protocolType, boolean assumeClientsSupportOutOfOrderResponses)
      {
          this.transportType = requireNonNull(transportType, "transportType is null");
          this.protocolType = requireNonNull(protocolType, "protocolType is null");
          this.assumeClientsSupportOutOfOrderResponses = assumeClientsSupportOutOfOrderResponses;
      }
  
      @Override
      public Optional<FrameInfo> tryDecodeFrameInfo(ByteBuf buffer)
      {
          TChannelBufferInputTransport transport = new TChannelBufferInputTransport(buffer.retainedDuplicate());
          try {
              TProtocol protocol = protocolType.createProtocol(transport);
              TMessage message;
              try {
                  message = protocol.readMessageBegin();
              }
              catch (TException | RuntimeException e) {
                  // not enough bytes in the input to decode sequence id
                  return Optional.empty();
              }
              return Optional.of(new FrameInfo(
                      message.getName(),
                      message.getType(),
                      message.getSequenceId(),
                      transportType,
                      protocolType,
                      assumeClientsSupportOutOfOrderResponses));
          }
          finally {
              transport.release();
          }
      }
  }
  