/*
* Copyright 2011 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 java.net.ConnectException;
import java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;
import io.netty.bootstrap.ClientBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelStateEvent;
import io.netty.channel.ExceptionEvent;
import io.netty.channel.SimpleChannelUpstreamHandler;
import io.netty.handler.timeout.ReadTimeoutException;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
/**
* Keep reconnecting to the server while printing out the current uptime and
* connection attempt status.
*/
public class UptimeClientHandler extends SimpleChannelUpstreamHandler {
final ClientBootstrap bootstrap;
private final Timer timer;
private long startTime = -1;
public UptimeClientHandler(ClientBootstrap bootstrap, Timer timer) {
this.bootstrap = bootstrap;
this.timer = timer;
}
InetSocketAddress getRemoteAddress() {
return (InetSocketAddress) bootstrap.getOption("remoteAddress");
}
@Override
public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
println("Disconnected from: " + getRemoteAddress());
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
println("Sleeping for: " + UptimeClient.RECONNECT_DELAY + "s");
timer.newTimeout(new TimerTask() {
public void run(Timeout timeout) throws Exception {
println("Reconnecting to: " + getRemoteAddress());
bootstrap.connect();
}
}, UptimeClient.RECONNECT_DELAY, TimeUnit.SECONDS);
}
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
if (startTime < 0) {
startTime = System.currentTimeMillis();
}
println("Connected to: " + getRemoteAddress());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
Throwable cause = e.getCause();
if (cause instanceof ConnectException) {
startTime = -1;
println("Failed to connect: " + cause.getMessage());
}
if (cause instanceof ReadTimeoutException) {
// The connection was OK but there was no traffic for last period.
println("Disconnecting due to no inbound traffic");
} else {
cause.printStackTrace();
}
ctx.getChannel().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);
}
}
}