92efa3c916
Motivation: Uptime example is lack of server. UptimeClient's code style is a little bit different from others, which make reader feel confused. We don't need to create a new Bootstrap instance each time client reconnect to server. Modification: Add UptimeServer and UptimeServerHandler which simply accept all connection and discard all message. Change UptimeClient's code style. Share a single Bootstrap instance. Result: Uptime server support. Consistent code style. Single Bootstrap for all reconnection.
94 lines
3.0 KiB
Java
94 lines
3.0 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.uptime;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.timeout.IdleState;
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import io.netty.handler.timeout.IdleStateEvent;
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import java.util.concurrent.TimeUnit;
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/**
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* Keep reconnecting to the server while printing out the current uptime and
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* connection attempt getStatus.
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*/
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@Sharable
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public class UptimeClientHandler extends SimpleChannelInboundHandler<Object> {
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long startTime = -1;
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@Override
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public void channelActive(ChannelHandlerContext ctx) {
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if (startTime < 0) {
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startTime = System.currentTimeMillis();
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}
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println("Connected to: " + ctx.channel().remoteAddress());
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}
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@Override
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public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
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// Discard received data
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}
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@Override
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public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
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if (!(evt instanceof IdleStateEvent)) {
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return;
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}
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IdleStateEvent e = (IdleStateEvent) evt;
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if (e.state() == IdleState.READER_IDLE) {
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// The connection was OK but there was no traffic for last period.
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println("Disconnecting due to no inbound traffic");
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ctx.close();
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}
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}
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@Override
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public void channelInactive(final ChannelHandlerContext ctx) {
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println("Disconnected from: " + ctx.channel().remoteAddress());
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}
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@Override
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public void channelUnregistered(final ChannelHandlerContext ctx) throws Exception {
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println("Sleeping for: " + UptimeClient.RECONNECT_DELAY + 's');
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ctx.channel().eventLoop().schedule(new Runnable() {
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@Override
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public void run() {
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println("Reconnecting to: " + UptimeClient.HOST + ':' + UptimeClient.PORT);
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UptimeClient.connect();
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}
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}, UptimeClient.RECONNECT_DELAY, TimeUnit.SECONDS);
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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ctx.close();
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}
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void println(String msg) {
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if (startTime < 0) {
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System.err.format("[SERVER IS DOWN] %s%n", msg);
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} else {
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System.err.format("[UPTIME: %5ds] %s%n", (System.currentTimeMillis() - startTime) / 1000, msg);
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}
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}
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}
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