ServerEndpoint实例化

ServerEndpoint实例化

    @Override
    public void onConnect(WebSocketHttpExchange exchange, WebSocketChannel channel) {
        ConfiguredServerEndpoint config = HandshakeUtil.getConfig(channel);
        try {
            if(container.isClosed()) {
                //if the underlying container is closed we just reject
                channel.sendClose();
                channel.resumeReceives();
                return;
            }
            InstanceFactory<?> endpointFactory = config.getEndpointFactory();
            ServerEndpointConfig.Configurator configurator = config.getEndpointConfiguration().getConfigurator();
            final InstanceHandle<?> instance;
            DefaultContainerConfigurator.setCurrentInstanceFactory(endpointFactory);
            final Object instanceFromConfigurator = configurator.getEndpointInstance(config.getEndpointConfiguration().getEndpointClass());
            final InstanceHandle<?> factoryInstance = DefaultContainerConfigurator.clearCurrentInstanceFactory();
            if (factoryInstance == null) {
                instance = new ImmediateInstanceHandle<>(instanceFromConfigurator);
            } else if (factoryInstance.getInstance() == instanceFromConfigurator) {
                instance = factoryInstance;
            } else {
                //the default instance has been wrapped
                instance = new InstanceHandle<Object>() {
                    @Override
                    public Object getInstance() {
                        return instanceFromConfigurator;
                    }

                    @Override
                    public void release() {
                        factoryInstance.release();
                    }
                };
            }

            ServletRequestContext src = exchange.getAttachment(ServletRequestContext.ATTACHMENT_KEY);
            Principal principal = exchange.getAttachment(HandshakeUtil.PRINCIPAL);
            if(principal == null) {
                if(src.getServletRequest() instanceof HttpServletRequest) {
                    principal = ((HttpServletRequest)src.getServletRequest()).getUserPrincipal();
                } else {
                    principal = src.getOriginalRequest().getUserPrincipal();
                }
            }
            final InstanceHandle<Endpoint> endpointInstance;
            if(config.getAnnotatedEndpointFactory() != null) {
                final AnnotatedEndpoint annotated = config.getAnnotatedEndpointFactory().createInstance(instance);
                endpointInstance = new InstanceHandle<Endpoint>() {
                    @Override
                    public Endpoint getInstance() {
                        return annotated;
                    }

                    @Override
                    public void release() {
                        instance.release();
                    }
                };
            } else {
                endpointInstance = (InstanceHandle<Endpoint>) instance;
            }

            UndertowSession session = new UndertowSession(channel, URI.create(exchange.getRequestURI()), exchange.getAttachment(HandshakeUtil.PATH_PARAMS), exchange.getRequestParameters(), this, principal, endpointInstance, config.getEndpointConfiguration(), exchange.getQueryString(), config.getEncodingFactory().createEncoding(config.getEndpointConfiguration()), config, channel.getSubProtocol(), Collections.<Extension>emptyList(), null);
            config.addOpenSession(session);

            session.setMaxBinaryMessageBufferSize(getContainer().getDefaultMaxBinaryMessageBufferSize());
            session.setMaxTextMessageBufferSize(getContainer().getDefaultMaxTextMessageBufferSize());
            session.setMaxIdleTimeout(getContainer().getDefaultMaxSessionIdleTimeout());
            session.getAsyncRemote().setSendTimeout(getContainer().getDefaultAsyncSendTimeout());
            try {
                endpointInstance.getInstance().onOpen(session, config.getEndpointConfiguration());
            } catch (Exception e) {
                endpointInstance.getInstance().onError(session, e);
                IoUtils.safeClose(session);
            }
            channel.resumeReceives();
        } catch (Exception e) {
            JsrWebSocketLogger.REQUEST_LOGGER.endpointCreationFailed(e);
            IoUtils.safeClose(channel);
        }
    }

    @Override
    public <T> T getEndpointInstance(final Class<T> endpointClass) throws InstantiationException {
        InstanceFactory<?> factory = currentInstanceFactory.get();
        if(factory != null) {
            InstanceHandle<?> instance = factory.createInstance();
            currentInstanceHandle.set(instance);
            return (T) instance.getInstance();
        }
        try {
            return endpointClass.newInstance();
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public <T> T getEndpointInstance(Class<T> clazz)
            throws InstantiationException {
        try {
            return clazz.getConstructor().newInstance();
        } catch (InstantiationException e) {
            throw e;
        } catch (ReflectiveOperationException e) {
            InstantiationException ie = new InstantiationException();
            ie.initCause(e);
            throw ie;
        }
    }

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