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# Reactive Web Server
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Reactive web server implementation using Jetty for WebFlux applications. Provides non-blocking, reactive HTTP server capabilities optimized for high-concurrency applications with asynchronous I/O.
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## Capabilities
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### JettyReactiveWebServerFactory
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Creates and configures Jetty reactive web server instances for Spring WebFlux applications.
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```java { .api }
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/**
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 * Factory for creating reactive Jetty web servers for WebFlux applications
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 */
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public class JettyReactiveWebServerFactory 
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    extends AbstractReactiveWebServerFactory 
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    implements ConfigurableJettyWebServerFactory {
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    /** Create factory with default configuration */
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    public JettyReactiveWebServerFactory();
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    /** Create factory with specified port */
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    public JettyReactiveWebServerFactory(int port);
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    /** Create reactive web server with HTTP handler */
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    public WebServer getWebServer(HttpHandler httpHandler);
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    /** Add server customizers for additional configuration */
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    public void addServerCustomizers(JettyServerCustomizer... customizers);
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    /** Get collection of configured server customizers */
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    public Collection<JettyServerCustomizer> getServerCustomizers();
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    /** Set number of acceptor threads */
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    public void setAcceptors(int acceptors);
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    /** Set number of selector threads */
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    public void setSelectors(int selectors);
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    /** Configure forward headers handling */
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    public void setUseForwardHeaders(boolean useForwardHeaders);
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    /** Set resource factory for HTTP client resources */
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    public void setResourceFactory(JettyResourceFactory resourceFactory);
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    /** Get the configured resource factory */
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    public JettyResourceFactory getResourceFactory();
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    /** Set maximum number of connections */
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    public void setMaxConnections(int maxConnections);
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    /** Set thread pool configuration */
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    public void setThreadPool(ThreadPool threadPool);
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    /** Get the configured thread pool */
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    public ThreadPool getThreadPool();
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    /** Set collection of server customizers */
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    public void setServerCustomizers(Collection<? extends JettyServerCustomizer> customizers);
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}
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```
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**Usage Examples:**
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```java
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@Configuration
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public class JettyReactiveConfig {
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    @Bean
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    public JettyReactiveWebServerFactory jettyReactiveWebServerFactory() {
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        JettyReactiveWebServerFactory factory = new JettyReactiveWebServerFactory(8080);
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        // Configure for high concurrency
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        factory.setAcceptors(1);
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        factory.setSelectors(8);
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        // Add custom server configuration
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        factory.addServerCustomizers(server -> {
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            // Configure HTTP/2 support
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            HTTP2ServerConnectionFactory h2 = new HTTP2ServerConnectionFactory(
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                new HttpConfiguration());
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            ServerConnector connector = new ServerConnector(server, h2);
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            connector.setPort(8080);
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            server.addConnector(connector);
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        });
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        return factory;
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    }
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}
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```
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### Resource Management
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Jetty resource factory for managing HTTP client and server resources efficiently.
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```java { .api }
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/**
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 * Factory for managing Jetty HTTP client and server resources
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 */
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public class JettyResourceFactory implements DisposableBean, InitializingBean {
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    /** Create resource factory with default configuration */
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    public JettyResourceFactory();
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    /** Get the HTTP client instance */
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    public HttpClient getHttpClient();
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    /** Get the executor for async operations */
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    public Executor getExecutor();
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    /** Get the scheduler for timed operations */
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    public Scheduler getScheduler();
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    /** Get the byte buffer pool */
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    public ByteBufferPool getByteBufferPool();
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    /** Set custom thread pool */
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    public void setThreadPool(ThreadPool threadPool);
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    /** Set custom executor */
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    public void setExecutor(Executor executor);
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    /** Set custom scheduler */
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    public void setScheduler(Scheduler scheduler);
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    /** Set custom byte buffer pool */
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    public void setByteBufferPool(ByteBufferPool byteBufferPool);
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    /** Lifecycle method - initialize resources */
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    public void afterPropertiesSet() throws Exception;
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    /** Lifecycle method - destroy resources */
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    public void destroy() throws Exception;
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}
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```
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### HTTP/2 Support
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HTTP/2 protocol support is configured through server customizers and Jetty's connection factories.
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**HTTP/2 Configuration Example:**
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```java
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@Configuration
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public class Http2Config {
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    @Bean
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    public JettyReactiveWebServerFactory jettyFactory() {
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        JettyReactiveWebServerFactory factory = new JettyReactiveWebServerFactory();
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        factory.addServerCustomizers(server -> {
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            HttpConfiguration httpConfig = new HttpConfiguration();
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            httpConfig.setSendServerVersion(false);
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            httpConfig.setSendXPoweredBy(false);
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            // HTTP/1.1 configuration
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            HttpConnectionFactory http1 = new HttpConnectionFactory(httpConfig);
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            // HTTP/2 configuration
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            HTTP2ServerConnectionFactory http2 = new HTTP2ServerConnectionFactory(httpConfig);
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            http2.setMaxConcurrentStreams(100);
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            http2.setInitialStreamRecvWindow(65536);
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            // ALPN configuration for protocol negotiation
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            ALPNServerConnectionFactory alpn = new ALPNServerConnectionFactory();
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            alpn.setDefaultProtocol("http/1.1");
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            ServerConnector connector = new ServerConnector(server, alpn, http2, http1);
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            connector.setPort(8080);
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            server.addConnector(connector);
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        });
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        return factory;
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    }
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}
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```
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### Reactive Handler Integration
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Integration with Spring WebFlux HttpHandler for reactive request processing.
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```java { .api }
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/**
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 * Jetty adapter for Spring WebFlux HttpHandler
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 */
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public class JettyHttpHandlerAdapter {
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    /** Create adapter for HTTP handler */
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    public JettyHttpHandlerAdapter(HttpHandler httpHandler);
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    /** Handle reactive HTTP requests */
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    public void handle(Request request, Response response, Callback callback);
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    /** Configure request and response buffer sizes */
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    public void setRequestBufferSize(int requestBufferSize);
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    public void setResponseBufferSize(int responseBufferSize);
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}
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```
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### Server Lifecycle Management
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Lifecycle management for reactive Jetty servers.
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```java { .api }
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/**
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 * Lifecycle management for reactive Jetty web servers
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 */
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public class JettyWebServer implements WebServer {
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    /** Start the reactive server */
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    public void start() throws WebServerException;
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    /** Stop the server gracefully */
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    public void stop() throws WebServerException;
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    /** Get the server port */
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    public int getPort();
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    /** Get the underlying Jetty server */
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    public Server getServer();
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    /** Graceful shutdown with callback */
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    public void shutDownGracefully(GracefulShutdownCallback callback);
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}
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```
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**Reactive Application Example:**
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```java
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@SpringBootApplication
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public class ReactiveJettyApplication {
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    public static void main(String[] args) {
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        SpringApplication.run(ReactiveJettyApplication.class, args);
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    }
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    @Bean
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    public RouterFunction<ServerResponse> routes() {
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        return RouterFunctions.route()
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            .GET("/hello", request -> 
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                ServerResponse.ok()
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                    .contentType(MediaType.TEXT_PLAIN)
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                    .body(Mono.just("Hello from Jetty!"), String.class))
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            .build();
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    }
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}
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```