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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.codec.delimited.serialization;
    21
    22  import java.nio.ByteBuffer;
    23
    24  import org.apache.mina.codec.ProtocolEncoderException;
    25  import org.apache.mina.codec.delimited.ByteBufferEncoder;
    26  import org.apache.thrift.TBase;
    27  import org.apache.thrift.TException;
    28  import org.apache.thrift.TSerializer;
    29  import org.apache.thrift.protocol.TBinaryProtocol;
    30
    31  /**
    32   * Encode Thrift message into {@link ByteBuffer}
    33   *
    34   * @param <INPUT> the base type for message to encode
    35   *
    36   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    37   */
    38  public class ThriftMessageEncoder<INPUT extends TBase<?, ?>> extends ByteBufferEncoder<INPUT> {
    39      private final TSerializer serializer = new TSerializer(new TBinaryProtocol.Factory());
    40
    41      private INPUT lastMessage;
    42
    43      private byte[] lastBuffer;
    44
    45      public static <L extends TBase<?, ?>> ThriftMessageEncoder<L> newInstance(Class<L> clazz) {
    46          return new ThriftMessageEncoder<L>();
    47      }
    48
    49      private byte[] prepareBuffer(INPUT message) throws TException {
    50          if (message != lastMessage) { // NOSONAR, comparing the messages, not their content
    51              lastBuffer = serializer.serialize(message);
    52              this.lastMessage = message;
    53          }
    54          return lastBuffer;
    55      }
    56
    57      /**
    58       * {@inheritDoc}
    59       */
    60      @Override
    61      public int getEncodedSize(INPUT message) {
    62          try {
    63              return prepareBuffer(message).length;
    64          } catch (TException e) {
    65              return 0;
    66          }
    67      }
    68
    69      /**
    70       * {@inheritDoc}
    71       */
    72      @Override
    73      public void writeTo(INPUT message, ByteBuffer buffer) {
    74          try {
    75              buffer.put(prepareBuffer(message));
    76          } catch (TException e) {
    77              throw new ProtocolEncoderException(e);
    78          }
    79      }
    80  }