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.cassandra.utils;
  
  import java.nio.ByteBuffer;
  import java.util.zip.Checksum;
  import java.util.zip.CRC32;
  import java.util.zip.Adler32;
  
  import io.netty.util.concurrent.FastThreadLocal;
  
  public enum ChecksumType
  {
      ADLER32
      {
  
          @Override
          public Checksum newInstance()
          {
              return new Adler32();
          }
  
          @Override
          public void update(Checksum checksum, ByteBuffer buf)
          {
              ((Adler32)checksum).update(buf);
          }
  
      },
      CRC32
      {
  
          @Override
          public Checksum newInstance()
          {
              return new CRC32();
          }
  
          @Override
          public void update(Checksum checksum, ByteBuffer buf)
          {
              ((CRC32)checksum).update(buf);
          }
  
      };
  
      public abstract Checksum newInstance();
      public abstract void update(Checksum checksum, ByteBuffer buf);
  
      private FastThreadLocal<Checksum> instances = new FastThreadLocal<Checksum>()
      {
          protected Checksum initialValue() throws Exception
          {
              return newInstance();
          }
      };
  
      public long of(ByteBuffer buf)
      {
          Checksum checksum = instances.get();
          checksum.reset();
          update(checksum, buf);
          return checksum.getValue();
      }
  
      public long of(byte[] data, int off, int len)
      {
          Checksum checksum = instances.get();
          checksum.reset();
          checksum.update(data, off, len);
          return checksum.getValue();
      }
  }
  