org.apache.hbase.thirdparty.io.netty.example.redis.RedisClientHandler Maven / Gradle / Ivy
/*
* Copyright 2016 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 org.apache.hbase.thirdparty.io.netty.example.redis;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufUtil;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelPromise;
import org.apache.hbase.thirdparty.io.netty.handler.codec.CodecException;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.ArrayRedisMessage;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.ErrorRedisMessage;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.FullBulkStringRedisMessage;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.IntegerRedisMessage;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.RedisMessage;
import org.apache.hbase.thirdparty.io.netty.handler.codec.redis.SimpleStringRedisMessage;
import org.apache.hbase.thirdparty.io.netty.util.CharsetUtil;
import org.apache.hbase.thirdparty.io.netty.util.ReferenceCountUtil;
import java.util.ArrayList;
import java.util.List;
/**
* An example Redis client handler. This handler read input from STDIN and write output to STDOUT.
*/
public class RedisClientHandler extends ChannelDuplexHandler {
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
String[] commands = ((String) msg).split("\\s+");
List children = new ArrayList(commands.length);
for (String cmdString : commands) {
children.add(new FullBulkStringRedisMessage(ByteBufUtil.writeUtf8(ctx.alloc(), cmdString)));
}
RedisMessage request = new ArrayRedisMessage(children);
ctx.write(request, promise);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
RedisMessage redisMessage = (RedisMessage) msg;
printAggregatedRedisResponse(redisMessage);
ReferenceCountUtil.release(redisMessage);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
System.err.print("exceptionCaught: ");
cause.printStackTrace(System.err);
ctx.close();
}
private static void printAggregatedRedisResponse(RedisMessage msg) {
if (msg instanceof SimpleStringRedisMessage) {
System.out.println(((SimpleStringRedisMessage) msg).content());
} else if (msg instanceof ErrorRedisMessage) {
System.out.println(((ErrorRedisMessage) msg).content());
} else if (msg instanceof IntegerRedisMessage) {
System.out.println(((IntegerRedisMessage) msg).value());
} else if (msg instanceof FullBulkStringRedisMessage) {
System.out.println(getString((FullBulkStringRedisMessage) msg));
} else if (msg instanceof ArrayRedisMessage) {
for (RedisMessage child : ((ArrayRedisMessage) msg).children()) {
printAggregatedRedisResponse(child);
}
} else {
throw new CodecException("unknown message type: " + msg);
}
}
private static String getString(FullBulkStringRedisMessage msg) {
if (msg.isNull()) {
return "(null)";
}
return msg.content().toString(CharsetUtil.UTF_8);
}
}