| /* |
| * 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 io.netty.util.concurrent.FastThreadLocal; |
| |
| import java.nio.ByteBuffer; |
| import java.util.zip.Checksum; |
| import java.util.zip.CRC32; |
| import java.util.zip.Adler32; |
| |
| 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(); |
| } |
| } |