Examples of javax.websocket.server.ServerContainer

javax.websocket.server.ServerContainer
The ServerContainer is the specialized view of the WebSocketContainer available in server-side deployments. There is one ServerContainer instance per websocket application. The ServerContainer holds the methods to be able to register server endpoints during the initialization phase of the application.
For websocket enabled web containers, developers may obtain a reference to the ServerContainer instance by retrieving it as an attribute named javax.websocket.server.ServerContainer on the ServletContext. This way, the registration methods held on this interface may be called to register server endpoints from a ServletContextListener during the deployment of the WAR file containing the endpoint.

WebSocket implementations that run outside the web container may have other means by which to provide a ServerContainer instance to the developer at application deployment time.

Once the application deployment phase is complete, and the websocket application has begun accepting incoming connections, the registration methods may no longer be called. @author dannycoward

        private static final String PATH = "/test";


        @Override
        public void contextInitialized(ServletContextEvent sce) {
            super.contextInitialized(sce);
            ServerContainer sc =
                    (ServerContainer) sce.getServletContext().getAttribute(
                            Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE);
            try {
                sc.addEndpoint(ServerEndpointConfig.Builder.create(
                        ConstantTxEndpoint.class, PATH).build());
                if (TestWsWebSocketContainer.timoutOnContainer) {
                    sc.setAsyncSendTimeout(TIMEOUT_MS);
                }
            } catch (DeploymentException e) {
                throw new IllegalStateException(e);
            }
        }

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    public static class ProgramaticServerEndpointConfig extends WsContextListener {


        @Override
        public void contextInitialized(ServletContextEvent sce) {
            super.contextInitialized(sce);
            ServerContainer sc =
                    (ServerContainer) sce.getServletContext().getAttribute(
                            org.apache.tomcat.websocket.server.Constants.
                            SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE);
            try {
                sc.addEndpoint(new ServerEndpointConfig() {
                    @Override
                    public Map<String, Object> getUserProperties() {
                        return Collections.emptyMap();
                    }
                    @Override

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  protected ServerContainer getContainer(HttpServletRequest request) {
    ServletContext servletContext = request.getServletContext();
    String attrName = "javax.websocket.server.ServerContainer";
    ServerContainer container = (ServerContainer) servletContext.getAttribute(attrName);
    Assert.notNull(container, "No 'javax.websocket.server.ServerContainer' ServletContext attribute. " +
        "Are you running in a Servlet container that supports JSR-356?");
    return container;
  }

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        String cometdURLMapping = (String)getOption(COMETD_URL_MAPPING);
        if (cometdURLMapping == null)
            throw new IllegalArgumentException("Missing '" + COMETD_URL_MAPPING + "' parameter");


        ServerContainer container = (ServerContainer)context.getAttribute(ServerContainer.class.getName());
        if (container == null)
            throw new IllegalArgumentException("Missing WebSocket ServerContainer");


        // JSR 356 does not support a input buffer size option
        int maxMessageSize = getOption(MAX_MESSAGE_SIZE_OPTION, container.getDefaultMaxTextMessageBufferSize());
        container.setDefaultMaxTextMessageBufferSize(maxMessageSize);
        long idleTimeout = getOption(IDLE_TIMEOUT_OPTION, container.getDefaultMaxSessionIdleTimeout());
        container.setDefaultMaxSessionIdleTimeout(idleTimeout);


        String protocol = getProtocol();
        List<String> protocols = protocol == null ? null : Collections.singletonList(protocol);


        for (String mapping : normalizeURLMapping(cometdURLMapping))
        {
            ServerEndpointConfig config = ServerEndpointConfig.Builder.create(WebSocketScheduler.class, mapping)
                    .subprotocols(protocols)
                    .configurator(new Configurator(context))
                    .build();
            try
            {
                container.addEndpoint(config);
            }
            catch (DeploymentException x)
            {
                throw new RuntimeException(x);
            }

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        ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
        context.setContextPath("/");
        server.setHandler(context);


        ServerContainer wscontainer = WebSocketServerContainerInitializer.configureContext(context);


        try {
            wscontainer.addEndpoint(new RPDEndpointConfig());
            server.start();
            server.join();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

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@WebListener
public class MyServletContextListenerProgrammatic extends Endpoint implements ServletContextListener {


    @Override
    public void contextInitialized(ServletContextEvent sce) {
        final ServerContainer serverContainer = (ServerContainer) sce.getServletContext().getAttribute("javax.websocket.server.ServerContainer");


        try {
            // this is the important call
            serverContainer.addEndpoint(ServerEndpointConfig.Builder.create(MyServletContextListenerProgrammatic.class,
                    "/programmatic").build());
        } catch (DeploymentException e) {
            e.printStackTrace();
        }
    }

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@ServerEndpoint("/annotated")
public class MyServletContextListenerAnnotated implements ServletContextListener {


    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        final ServerContainer serverContainer = (ServerContainer) servletContextEvent.getServletContext().getAttribute("javax.websocket.server.ServerContainer");


        try {
            // this is the important call
            serverContainer.addEndpoint(MyServletContextListenerAnnotated.class);
        } catch (DeploymentException e) {
            e.printStackTrace();
        }
    }

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public class AddEndpointServlet implements Servlet {
    @Override
    public void init(ServletConfig c) throws ServletException {
        String websocketPath = "/foo";
        ServerEndpointConfig config = ServerEndpointConfig.Builder.create(ProgramaticEndpoint.class, websocketPath).build();
        ServerContainer serverContainer = (ServerContainer) c.getServletContext().getAttribute("javax.websocket.server.ServerContainer");
        try {
            serverContainer.addEndpoint(config);
        } catch (DeploymentException ex) {
            throw new ServletException("Error deploying websocket endpoint:", ex);
        }
    }

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        public static final String PATH = "/block";


        @Override
        public void contextInitialized(ServletContextEvent sce) {
            super.contextInitialized(sce);
            ServerContainer sc =
                    (ServerContainer) sce.getServletContext().getAttribute(
                            Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE);
            try {
                sc.addEndpoint(BlockingPojo.class);
            } catch (DeploymentException e) {
                throw new IllegalStateException(e);
            }
        }

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        private static final String PATH = "/test";


        @Override
        public void contextInitialized(ServletContextEvent sce) {
            super.contextInitialized(sce);
            ServerContainer sc =
                    (ServerContainer) sce.getServletContext().getAttribute(
                            Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE);
            try {
                sc.addEndpoint(ServerEndpointConfig.Builder.create(
                        ConstantTxEndpoint.class, PATH).build());
                if (TestWsWebSocketContainer.timoutOnContainer) {
                    sc.setAsyncSendTimeout(TIMEOUT_MS);
                }
            } catch (DeploymentException e) {
                throw new IllegalStateException(e);
            }
        }

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