/*
* 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.example.memcache.binary;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.memcache.binary.BinaryMemcacheOpcodes;
import io.netty.handler.codec.memcache.binary.BinaryMemcacheRequest;
import io.netty.handler.codec.memcache.binary.DefaultBinaryMemcacheRequest;
import io.netty.handler.codec.memcache.binary.DefaultFullBinaryMemcacheRequest;
import io.netty.handler.codec.memcache.binary.FullBinaryMemcacheResponse;
import io.netty.util.CharsetUtil;
public class MemcacheClientHandler extends ChannelHandlerAdapter {
/**
* Transforms basic string requests to binary memcache requests
*/
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
String command = (String) msg;
if (command.startsWith("get ")) {
String key = command.substring("get ".length());
BinaryMemcacheRequest req = new DefaultBinaryMemcacheRequest(key);
req.setOpcode(BinaryMemcacheOpcodes.GET);
req.setKeyLength((short) key.length());
req.setTotalBodyLength(key.length());
ctx.write(req, promise);
} else if (command.startsWith("set ")) {
String[] parts = command.split(" ", 3);
if (parts.length < 3) {
throw new IllegalArgumentException("Malformed Command: " + command);
}
String key = parts[1];
String value = parts[2];
ByteBuf content = Unpooled.wrappedBuffer(value.getBytes(CharsetUtil.UTF_8));
ByteBuf extras = ctx.alloc().buffer(8);
BinaryMemcacheRequest req = new DefaultFullBinaryMemcacheRequest(key, extras, content);
req.setOpcode(BinaryMemcacheOpcodes.SET);
req.setKeyLength((short) key.length());
req.setExtrasLength((byte) 8);
req.setTotalBodyLength(key.length() + 8 + value.length());
ctx.write(req, promise);
} else {
throw new IllegalStateException("Unknown Message: " + msg);
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
FullBinaryMemcacheResponse res = (FullBinaryMemcacheResponse) msg;
System.out.println(res.content().toString(CharsetUtil.UTF_8));
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}