From 1bdd0a59d7aa94ee35f280abf4904260e5c7aca5 Mon Sep 17 00:00:00 2001
From: Nikita <abracham.mitchell@gmail.com>
Date: Fri, 13 Nov 2015 13:56:06 +0300
Subject: [PATCH] LZ4 codec added. #267

---
 pom.xml                                       |   6 +
 .../java/org/redisson/codec/LZ4Codec.java     | 110 ++++++++++++++++++
 .../java/org/redisson/RedissonCodecTest.java  |  11 ++
 3 files changed, 127 insertions(+)
 create mode 100644 src/main/java/org/redisson/codec/LZ4Codec.java

diff --git a/pom.xml b/pom.xml
index b17614976..513155e8b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -140,6 +140,12 @@
       <scope>test</scope>
   </dependency>
 
+  <dependency>
+      <groupId>net.jpountz.lz4</groupId>
+      <artifactId>lz4</artifactId>
+      <version>1.3.0</version>
+      <scope>provided</scope>
+  </dependency>
   <dependency>
       <groupId>org.msgpack</groupId>
       <artifactId>jackson-dataformat-msgpack</artifactId>
diff --git a/src/main/java/org/redisson/codec/LZ4Codec.java b/src/main/java/org/redisson/codec/LZ4Codec.java
new file mode 100644
index 000000000..01afffa60
--- /dev/null
+++ b/src/main/java/org/redisson/codec/LZ4Codec.java
@@ -0,0 +1,110 @@
+/**
+ * Copyright 2014 Nikita Koksharov, Nickolay Borbit
+ *
+ * Licensed 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.redisson.codec;
+
+import java.io.IOException;
+
+import org.redisson.client.codec.Codec;
+import org.redisson.client.handler.State;
+import org.redisson.client.protocol.Decoder;
+import org.redisson.client.protocol.Encoder;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import net.jpountz.lz4.LZ4Compressor;
+import net.jpountz.lz4.LZ4Factory;
+import net.jpountz.lz4.LZ4SafeDecompressor;
+
+/**
+ * LZ4 compression codec.
+ * Uses inner <code>Codec</codec> to convert object to binary stream.
+ * <codec>FstCodec</codec> used by default.
+ *
+ * https://github.com/jpountz/lz4-java
+ *
+ * @see org.redisson.codec.FstCodec
+ *
+ * @author Nikita Koksharov
+ *
+ */
+public class LZ4Codec implements Codec {
+
+    private final LZ4Factory factory = LZ4Factory.fastestInstance();
+
+    private final Codec innerCodec;
+
+    public LZ4Codec() {
+        this(new FstCodec());
+    }
+
+    public LZ4Codec(Codec innerCodec) {
+        this.innerCodec = innerCodec;
+    }
+
+    private final Decoder<Object> decoder = new Decoder<Object>() {
+        @Override
+        public Object decode(ByteBuf buf, State state) throws IOException {
+            byte[] bytes = new byte[buf.readableBytes()];
+            buf.readBytes(bytes);
+
+            LZ4SafeDecompressor decompressor = factory.safeDecompressor();
+            bytes = decompressor.decompress(bytes, bytes.length*3);
+            ByteBuf bf = Unpooled.wrappedBuffer(bytes);
+            return innerCodec.getValueDecoder().decode(bf, state);
+        }
+    };
+
+    private final Encoder encoder = new Encoder() {
+
+        @Override
+        public byte[] encode(Object in) throws IOException {
+            LZ4Compressor compressor = factory.fastCompressor();
+            byte[] bytes = innerCodec.getValueEncoder().encode(in);
+            return compressor.compress(bytes);
+        }
+    };
+
+    @Override
+    public Decoder<Object> getMapValueDecoder() {
+        return getValueDecoder();
+    }
+
+    @Override
+    public Encoder getMapValueEncoder() {
+        return getValueEncoder();
+    }
+
+    @Override
+    public Decoder<Object> getMapKeyDecoder() {
+        return getValueDecoder();
+    }
+
+    @Override
+    public Encoder getMapKeyEncoder() {
+        return getValueEncoder();
+    }
+
+    @Override
+    public Decoder<Object> getValueDecoder() {
+        return decoder;
+    }
+
+    @Override
+    public Encoder getValueEncoder() {
+        return encoder;
+    }
+
+}
diff --git a/src/test/java/org/redisson/RedissonCodecTest.java b/src/test/java/org/redisson/RedissonCodecTest.java
index 3b4903a4d..5bc89be98 100644
--- a/src/test/java/org/redisson/RedissonCodecTest.java
+++ b/src/test/java/org/redisson/RedissonCodecTest.java
@@ -12,6 +12,7 @@ import org.redisson.codec.CborJacksonCodec;
 import org.redisson.codec.FstCodec;
 import org.redisson.codec.JsonJacksonCodec;
 import org.redisson.codec.KryoCodec;
+import org.redisson.codec.LZ4Codec;
 import org.redisson.codec.MsgPackJacksonCodec;
 import org.redisson.codec.SerializationCodec;
 import org.redisson.codec.SnappyCodec;
@@ -25,6 +26,16 @@ public class RedissonCodecTest extends BaseTest {
     private Codec fstCodec = new FstCodec();
     private Codec snappyCodec = new SnappyCodec();
     private Codec msgPackCodec = new MsgPackJacksonCodec();
+    private Codec lz4Codec = new LZ4Codec();
+
+    @Test
+    public void testLZ4() {
+        Config config = createConfig();
+        config.setCodec(lz4Codec);
+        redisson = Redisson.create(config);
+
+        test();
+    }
 
     @Test
     public void testJdk() {