3c6017a9b1
Motivation: LZF compression codec provides sending and receiving data encoded by very fast LZF algorithm. Modifications: - Added Compress-LZF library which implements LZF algorithm - Implemented LzfEncoder which extends MessageToByteEncoder and provides compression of outgoing messages - Added tests to verify the LzfEncoder and how it can compress data for the next uncompression using the original library - Implemented LzfDecoder which extends ByteToMessageDecoder and provides uncompression of incoming messages - Added tests to verify the LzfDecoder and how it can uncompress data after compression using the original library - Added integration tests for LzfEncoder/Decoder Result: Full LZF compression codec which can compress/uncompress data using LZF algorithm.
109 lines
3.4 KiB
Java
109 lines
3.4 KiB
Java
/*
|
|
* Copyright 2014 The Netty Project
|
|
*
|
|
* The Netty Project 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 io.netty.handler.codec.compression;
|
|
|
|
import com.ning.compress.lzf.LZFDecoder;
|
|
import io.netty.buffer.ByteBuf;
|
|
import io.netty.buffer.CompositeByteBuf;
|
|
import io.netty.buffer.Unpooled;
|
|
import io.netty.channel.embedded.EmbeddedChannel;
|
|
import io.netty.util.internal.ThreadLocalRandom;
|
|
import org.junit.Before;
|
|
import org.junit.Test;
|
|
|
|
import static org.junit.Assert.*;
|
|
|
|
public class LzfEncoderTest {
|
|
|
|
private static final ThreadLocalRandom rand;
|
|
|
|
private static final byte[] BYTES_SMALL = new byte[256];
|
|
private static final byte[] BYTES_LARGE = new byte[256000];
|
|
|
|
static {
|
|
rand = ThreadLocalRandom.current();
|
|
//fill arrays with compressible data
|
|
for (int i = 0; i < BYTES_SMALL.length; i++) {
|
|
BYTES_SMALL[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
|
}
|
|
for (int i = 0; i < BYTES_LARGE.length; i++) {
|
|
BYTES_LARGE[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
|
}
|
|
}
|
|
|
|
private EmbeddedChannel channel;
|
|
|
|
@Before
|
|
public void initChannel() {
|
|
channel = new EmbeddedChannel(new LzfEncoder());
|
|
}
|
|
|
|
private static void testCompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
|
|
ByteBuf in = Unpooled.wrappedBuffer(data);
|
|
channel.writeOutbound(in);
|
|
channel.finish();
|
|
|
|
final byte[] uncompressed = uncompress(channel);
|
|
|
|
assertArrayEquals(data, uncompressed);
|
|
}
|
|
|
|
@Test
|
|
public void testCompressionOfSmallChunkOfData() throws Exception {
|
|
testCompression(channel, BYTES_SMALL);
|
|
}
|
|
|
|
@Test
|
|
public void testCompressionOfLargeChunkOfData() throws Exception {
|
|
testCompression(channel, BYTES_LARGE);
|
|
}
|
|
|
|
@Test
|
|
public void testCompressionOfBatchedFlowOfData() throws Exception {
|
|
final byte[] data = BYTES_LARGE;
|
|
|
|
int written = 0, length = rand.nextInt(100);
|
|
while (written + length < data.length) {
|
|
ByteBuf in = Unpooled.wrappedBuffer(data, written, length);
|
|
channel.writeOutbound(in);
|
|
written += length;
|
|
length = rand.nextInt(100);
|
|
}
|
|
ByteBuf in = Unpooled.wrappedBuffer(data, written, data.length - written);
|
|
channel.writeOutbound(in);
|
|
channel.finish();
|
|
|
|
final byte[] uncompressed = uncompress(channel);
|
|
|
|
assertArrayEquals(data, uncompressed);
|
|
}
|
|
|
|
private static byte[] uncompress(EmbeddedChannel channel) throws Exception {
|
|
CompositeByteBuf out = Unpooled.compositeBuffer();
|
|
ByteBuf msg;
|
|
while ((msg = channel.readOutbound()) != null) {
|
|
out.addComponent(msg);
|
|
out.writerIndex(out.writerIndex() + msg.readableBytes());
|
|
}
|
|
|
|
byte[] compressed = new byte[out.readableBytes()];
|
|
out.readBytes(compressed);
|
|
out.release();
|
|
|
|
return LZFDecoder.decode(compressed);
|
|
}
|
|
}
|