io.netty.netty4pingcap.handler.ipfilter.UniqueIpFilter Maven / Gradle / Ivy
/*
* 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.netty4pingcap.handler.ipfilter;
import io.netty.netty4pingcap.channel.Channel;
import io.netty.netty4pingcap.channel.ChannelFuture;
import io.netty.netty4pingcap.channel.ChannelFutureListener;
import io.netty.netty4pingcap.channel.ChannelHandler;
import io.netty.netty4pingcap.channel.ChannelHandlerContext;
import io.netty.netty4pingcap.util.internal.ConcurrentSet;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.Set;
/**
* This class allows one to ensure that at all times for every IP address there is at most one
* {@link Channel} connected to the server.
*/
@ChannelHandler.Sharable
public class UniqueIpFilter extends AbstractRemoteAddressFilter {
private final Set connected = new ConcurrentSet();
@Override
protected boolean accept(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) throws Exception {
final InetAddress remoteIp = remoteAddress.getAddress();
if (connected.contains(remoteIp)) {
return false;
} else {
connected.add(remoteIp);
ctx.channel().closeFuture().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
connected.remove(remoteIp);
}
});
return true;
}
}
}