Java tutorial
/* * Copyright 2017 ZhangJiupeng * * Licensed 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 cc.agentx.client.net.nio; import io.netty.channel.Channel; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.util.concurrent.Promise; import io.netty.util.internal.logging.InternalLogger; import io.netty.util.internal.logging.InternalLoggerFactory; public final class XPingHandler extends ChannelInboundHandlerAdapter { private static final InternalLogger log; static { log = InternalLoggerFactory.getInstance(XPingHandler.class); } private final Promise<Channel> promise; private final long initializeTimeMillis; public XPingHandler(Promise<Channel> promise, long initializeTimeMillis) { log.info("\t Proxy -> Target \tPing"); this.promise = promise; this.initializeTimeMillis = initializeTimeMillis; } @Override public void channelActive(ChannelHandlerContext ctx) { log.info("\t Proxy <- Target \tPong ~{}ms", System.currentTimeMillis() - initializeTimeMillis); ctx.pipeline().remove(this); promise.setSuccess(ctx.channel()); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable throwable) { log.warn("\tBad Ping! ({})", throwable.getMessage()); promise.setFailure(throwable); } }