/*
* Copyright 2012 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.uptime;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundByteHandlerAdapter;
import io.netty.channel.EventLoop;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import java.net.ConnectException;
import java.util.concurrent.TimeUnit;
/**
* Keep reconnecting to the server while printing out the current uptime and
* connection attempt getStatus.
*/
@Sharable
public class UptimeClientHandler extends ChannelInboundByteHandlerAdapter {
private final UptimeClient client;
private long startTime = -1;
public UptimeClientHandler(UptimeClient client) {
this.client = client;
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
if (startTime < 0) {
startTime = System.currentTimeMillis();
}
println("Connected to: " + ctx.channel().remoteAddress());
}
@Override
public void inboundBufferUpdated(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
// Discard received data
in.clear();
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (!(evt instanceof IdleStateEvent)) {
return;
}
IdleStateEvent e = (IdleStateEvent) evt;
if (e.state() == IdleState.READER_IDLE) {
// The connection was OK but there was no traffic for last period.
println("Disconnecting due to no inbound traffic");
ctx.close();
}
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
println("Disconnected from: " + ctx.channel().remoteAddress());
}
@Override
public void channelUnregistered(final ChannelHandlerContext ctx)
throws Exception {
println("Sleeping for: " + UptimeClient.RECONNECT_DELAY + 's');
final EventLoop loop = ctx.channel().eventLoop();
loop.schedule(new Runnable() {
@Override
public void run() {
println("Reconnecting to: " + ctx.channel().remoteAddress());
client.configureBootstrap(new Bootstrap(), loop).connect();
}
}, UptimeClient.RECONNECT_DELAY, TimeUnit.SECONDS);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
if (cause instanceof ConnectException) {
startTime = -1;
println("Failed to connect: " + cause.getMessage());
}
cause.printStackTrace();
ctx.close();
}
void println(String msg) {
if (startTime < 0) {
System.err.format("[SERVER IS DOWN] %s%n", msg);
} else {
System.err.format("[UPTIME: %5ds] %s%n", (System.currentTimeMillis() - startTime) / 1000, msg);
}
}
}