Java tutorial
/* ************************************************************************ # # DivConq # # http://divconq.com/ # # Copyright: # Copyright 2014 eTimeline, LLC. All rights reserved. # # License: # See the license.txt file in the project's top-level directory for details. # # Authors: # * Andy White # ************************************************************************ */ package divconq.ctp.net; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import divconq.net.ssl.SslHandler; import io.netty.handler.timeout.ReadTimeoutHandler; import io.netty.handler.timeout.WriteTimeoutHandler; import java.util.List; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.CopyOnWriteArrayList; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; import divconq.bus.net.SocketInfo; import divconq.bus.net.SslContextFactory; import divconq.ctp.CtpAdapter; import divconq.ctp.s.CtpsHandler; import divconq.hub.Hub; import divconq.hub.ISystemWork; import divconq.hub.SysReporter; import divconq.lang.op.OperationContext; import divconq.log.Logger; import divconq.net.acl.AclFilter; import divconq.util.StringUtil; import divconq.xml.XElement; public class CtpServices { protected AclFilter acl = new AclFilter(); // TODO support protected Lock connectLock = new ReentrantLock(); // desired listeners protected List<SocketInfo> listeners = new CopyOnWriteArrayList<>(); protected final ConcurrentHashMap<SocketInfo, Channel> activelisteners = new ConcurrentHashMap<>(); /* * set localHub before calling this */ public void init(XElement config) { int conninterval = 5; if (config != null) { for (XElement node : config.selectAll("Acl")) this.acl.loadConfig(node); for (XElement node : config.selectAll("Listener")) { SocketInfo si = new SocketInfo(); si.loadConfig(node); this.addListener(si); } if (config.hasAttribute("ConnectingInterval")) conninterval = (int) StringUtil.parseInt(config.getAttribute("ConnectingInterval"), conninterval); } int connint = conninterval; ISystemWork busconnector = new ISystemWork() { @Override public void run(SysReporter reporter) { reporter.setStatus("dcCtp Services Connect"); if (!Hub.instance.isStopping()) CtpServices.this.connect(); reporter.setStatus("After dcCtp Services Connect"); } @Override public int period() { return connint; } }; Hub.instance.getClock().addSlowSystemWorker(busconnector); } public void addListener(SocketInfo info) { if (info == null) return; this.listeners.add(info); } public void removeListener(SocketInfo info) { this.listeners.remove(info); } public void connect() { // never try to connect until init has run if (Hub.instance.isStopping()) return; // if connect method is already running then skip - it will try again later if (!this.connectLock.tryLock()) return; try { // ========================================================================== // Add server binding when missing // ========================================================================== for (SocketInfo info : this.listeners) { // only if not currently bound if (this.activelisteners.containsKey(info)) continue; // ------------------------------------------------- // stream port // ------------------------------------------------- ServerBootstrap b = new ServerBootstrap().group(Hub.instance.getEventLoopGroup()) .channel(NioServerSocketChannel.class) .option(ChannelOption.ALLOCATOR, Hub.instance.getBufferAllocator()) //.option(ChannelOption.SO_BACKLOG, 125) // this is probably not needed but serves as note to research .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); if (info.isUseSsl()) pipeline.addLast("ssl", new SslHandler(SslContextFactory.getServerEngine())); // TODO this should be the external SSL not the BUS one pipeline.addLast("readTimeoutHandler", new ReadTimeoutHandler(60)); // TODO config pipeline.addLast("writeTimeoutHandler", new WriteTimeoutHandler(45)); // TODO config //pipeline.addLast("logger", new LoggingHandler(LogLevel.INFO)); // start as guest until authenticated CtpAdapter adapter = new CtpAdapter(OperationContext.allocateGuest()); adapter.setHandler(new CtpsHandler()); pipeline.addLast("ctp", new CtpHandler(adapter, true)); } }); try { // must wait here, both to keep the activelisteners listeners up to date // and also to make sure we don't release connectLock too soon ChannelFuture bfuture = b.bind(info.getAddress()).sync(); if (bfuture.isSuccess()) { Logger.info("dcCtp Server listening"); this.activelisteners.put(info, bfuture.channel()); } else Logger.error("dcCtp Server unable to bind: " + bfuture.cause()); } catch (InterruptedException x) { Logger.warn("dcCtp Server interrupted while binding: " + x); } catch (Exception x) { Logger.error("dcCtp Server unable to bind: " + x); } } // ========================================================================== // Remove server binding as needed // ========================================================================== for (final SocketInfo info : this.activelisteners.keySet()) { // all is well if in the listeners list if (this.listeners.contains(info)) continue; // otherwise we don't want to bind anymore this.stopSocketListener(info); } } finally { this.connectLock.unlock(); } } protected void stopSocketListener(SocketInfo info) { // tear down message port Channel ch = this.activelisteners.remove(info); try { // must wait here, both to keep the activelisteners listeners up to date // but also to make sure we don't release connectLock too soon ChannelFuture bfuture = ch.close().sync(); if (bfuture.isSuccess()) System.out.println("dcCtp Server unbound"); else System.out.println("dcCtp Server unable to unbind: " + bfuture.cause()); } catch (InterruptedException x) { System.out.println("dcCtp Server unable to unbind: " + x); } } public void stopMatrix() { this.connectLock.lock(); try { // we don't want to listen anymore for (final SocketInfo info : this.activelisteners.keySet()) this.stopSocketListener(info); } finally { this.connectLock.unlock(); } } public AclFilter getAcl() { return this.acl; } }