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 org.apache.kafka.common.compress;
  
  import org.apache.kafka.common.KafkaException;
  import org.apache.kafka.common.record.CompressionType;
  import org.apache.kafka.common.utils.BufferSupplier;
  import org.apache.kafka.common.utils.ByteBufferInputStream;
  import org.apache.kafka.common.utils.ByteBufferOutputStream;
  import org.apache.kafka.common.utils.ChunkedBytesStream;
  
  import org.xerial.snappy.SnappyInputStream;
  import org.xerial.snappy.SnappyOutputStream;
  
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  
  public class SnappyCompression implements Compression {
  
      private SnappyCompression() {}
  
      @Override
      public CompressionType type() {
          return CompressionType.SNAPPY;
      }
  
      @Override
      public OutputStream wrapForOutput(ByteBufferOutputStream bufferStream, byte messageVersion) {
          try {
              return new SnappyOutputStream(bufferStream);
          } catch (Throwable e) {
              throw new KafkaException(e);
          }
      }
  
      @Override
      public InputStream wrapForInput(ByteBuffer buffer, byte messageVersion, BufferSupplier decompressionBufferSupplier) {
          // SnappyInputStream uses default implementation of InputStream for skip. Default implementation of
          // SnappyInputStream allocates a new skip buffer every time, hence, we prefer our own implementation.
          try {
              return new ChunkedBytesStream(new SnappyInputStream(new ByteBufferInputStream(buffer)),
                                            decompressionBufferSupplier,
                                            decompressionOutputSize(),
                                            false);
          } catch (Throwable e) {
              throw new KafkaException(e);
          }
      }
  
      @Override
      public int decompressionOutputSize() {
          // SnappyInputStream already uses an intermediate buffer internally. The size
          // of this buffer is based on legacy implementation based on skipArray introduced in
          // https://github.com/apache/kafka/pull/6785
          return 2 * 1024; // 2KB
      }
  
      @Override
      public boolean equals(Object o) {
          return o instanceof SnappyCompression;
      }
  
      @Override
      public int hashCode() {
          return super.hashCode();
      }
  
      public static class Builder implements Compression.Builder<SnappyCompression> {
  
          @Override
          public SnappyCompression build() {
              return new SnappyCompression();
          }
      }
  
  }
  