| /* |
| * 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.iotdb.tsfile.compress; |
| |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import org.junit.After; |
| import org.junit.Assert; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.xerial.snappy.Snappy; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.StandardCharsets; |
| import java.util.concurrent.ThreadLocalRandom; |
| |
| public class SnappyTest { |
| |
| private String randomString(int length) { |
| StringBuilder builder = new StringBuilder(length); |
| for (int i = 0; i < length; i++) { |
| builder.append((char) (ThreadLocalRandom.current().nextInt(33, 128))); |
| } |
| return builder.toString(); |
| } |
| |
| @Before |
| public void setUp() {} |
| |
| @After |
| public void tearDown() {} |
| |
| @Test |
| public void testBytes1() throws IOException { |
| int n = 500000; |
| String input = randomString(n); |
| byte[] uncom = input.getBytes(StandardCharsets.UTF_8); |
| long time = System.nanoTime(); |
| byte[] compressed = Snappy.compress(uncom); |
| System.out.println("compression time cost:" + ((System.nanoTime() - time)) / 1000 / 1000); |
| System.out.println("ratio: " + (double) compressed.length / uncom.length); |
| time = System.nanoTime(); |
| byte[] uncompressed = Snappy.uncompress(compressed); |
| System.out.println("decompression time cost:" + ((System.nanoTime() - time)) / 1000 / 1000); |
| |
| Assert.assertArrayEquals(uncom, uncompressed); |
| } |
| |
| @Test |
| public void testBytes2() throws IOException { |
| ICompressor.SnappyCompressor compressor = new ICompressor.SnappyCompressor(); |
| IUnCompressor.SnappyUnCompressor unCompressor = new IUnCompressor.SnappyUnCompressor(); |
| |
| int n = 500000; |
| String input = randomString(n); |
| byte[] uncom = input.getBytes(StandardCharsets.UTF_8); |
| byte[] compressed = compressor.compress(uncom, 0, uncom.length); |
| // length should be same |
| Assert.assertEquals(compressor.compress(uncom).length, compressed.length); |
| byte[] uncompressed = unCompressor.uncompress(compressed); |
| Assert.assertArrayEquals(uncom, uncompressed); |
| } |
| |
| @Test |
| public void testByteBuffer() throws IOException { |
| String input = randomString(5000); |
| ByteBuffer source = ByteBuffer.allocateDirect(input.getBytes().length); |
| source.put(input.getBytes()); |
| source.flip(); |
| |
| long time = System.currentTimeMillis(); |
| ByteBuffer compressed = |
| ByteBuffer.allocateDirect(Snappy.maxCompressedLength(source.remaining())); |
| Snappy.compress(source, compressed); |
| System.out.println("compression time cost:" + (System.currentTimeMillis() - time)); |
| Snappy.uncompressedLength(compressed); |
| time = System.currentTimeMillis(); |
| ByteBuffer uncompressedByteBuffer = |
| ByteBuffer.allocateDirect(Snappy.uncompressedLength(compressed) + 1); |
| Snappy.uncompress(compressed, uncompressedByteBuffer); |
| System.out.println("decompression time cost:" + (System.currentTimeMillis() - time)); |
| assert input.equals(ReadWriteIOUtils.readStringFromDirectByteBuffer(uncompressedByteBuffer)); |
| } |
| } |