@Override
public CompletableFuture<Void> listen(Address address, Consumer<Connection> listener) {
Assert.notNull(address, "address");
Assert.notNull(listener, "listener");
if (listening) return CompletableFuture.completedFuture(null);
ThreadContext context = ThreadContext.currentContextOrThrow();
synchronized (this) {
if (listenFuture == null) {
listenFuture = new CompletableFuture<>();
listen(address, listener, context);
}
}
return listenFuture;
}
/** Starts listening for the given member. */
private void listen(Address address, Consumer<Connection> listener, ThreadContext context) {
channelGroup =
new DefaultChannelGroup("catalyst-acceptor-channels", GlobalEventExecutor.INSTANCE);
handler = new ServerHandler(connections, listener, context, transport.properties());
final ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap
.group(transport.eventLoopGroup())
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.DEBUG))
.childHandler(
new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel channel) throws Exception {
ChannelPipeline pipeline = channel.pipeline();
if (transport.properties().sslEnabled()) {
pipeline.addFirst(
new SslHandler(new NettyTls(transport.properties()).initSslEngine(false)));
}
pipeline.addLast(FIELD_PREPENDER);
pipeline.addLast(
new LengthFieldBasedFrameDecoder(
transport.properties().maxFrameSize(), 0, 4, 0, 4));
pipeline.addLast(handler);
}
})
.option(ChannelOption.SO_BACKLOG, transport.properties().acceptBacklog())
.option(ChannelOption.TCP_NODELAY, transport.properties().tcpNoDelay())
.option(ChannelOption.SO_REUSEADDR, transport.properties().reuseAddress())
.childOption(ChannelOption.ALLOCATOR, ALLOCATOR)
.childOption(ChannelOption.SO_KEEPALIVE, transport.properties().tcpKeepAlive());
if (transport.properties().sendBufferSize() != -1) {
bootstrap.childOption(ChannelOption.SO_SNDBUF, transport.properties().sendBufferSize());
}
if (transport.properties().receiveBufferSize() != -1) {
bootstrap.childOption(ChannelOption.SO_RCVBUF, transport.properties().receiveBufferSize());
}
LOGGER.info("Binding to {}", address);
ChannelFuture bindFuture = bootstrap.bind(address.socketAddress());
bindFuture.addListener(
(ChannelFutureListener)
channelFuture -> {
if (channelFuture.isSuccess()) {
listening = true;
context
.executor()
.execute(
() -> {
LOGGER.info("Listening at {}", bindFuture.channel().localAddress());
listenFuture.complete(null);
});
} else {
context.execute(() -> listenFuture.completeExceptionally(channelFuture.cause()));
}
});
channelGroup.add(bindFuture.channel());
}