Examples with Handler io.helidon.webserver.Handler used on opensource projects

Example 1 with Handler

use of io.helidon.webserver.Handler in project helidon by oracle.

the class Main method routingAsFilter.

/**
 * All routing rules (routes) are evaluated in a definition order. The {@link Handler} assigned with the first valid route
 * for given request is called. It is a responsibility of each handler to process in one of the following ways:
 * <ul>
 *     <li>Respond using one of {@link io.helidon.webserver.ServerResponse#send() ServerResponse.send(...)} method.</li>
 *     <li>Continue to next valid route using {@link io.helidon.webserver.ServerRequest#next() ServerRequest.next()} method.
 *     <i>It is possible to define filtering handlers.</i></li>
 * </ul>
 * <p>
 * If no valid {@link Handler} is found then routing respond by {@code HTTP 404} code.
 * <p>
 * If selected {@link Handler} doesn't process request than the request <b>stacks</b>!
 * <p>
 * <b>Blocking operations:</b><br>
 * For performance reason, {@link Handler} can be called directly by a selector thread. It is not good idea to block
 * such thread. If request must be processed by a blocking operation then such processing should be deferred to another
 * thread.
 */
public void routingAsFilter() {
    Routing routing = Routing.builder().any((req, res) -> {
        System.out.println(req.method() + " " + req.path());
        // Filters are just routing handlers which calls next()
        req.next();
    }).post("/post-endpoint", (req, res) -> res.status(Http.Status.CREATED_201).send()).get("/get-endpoint", (req, res) -> res.status(Http.Status.NO_CONTENT_204).send("Hello World!")).build();
    startServer(routing);
}

Example 2 with Handler

use of io.helidon.webserver.Handler in project helidon by oracle.

the class Main method firstRouting.

// ---------------- EXAMPLES
/**
 * True heart of WebServer API is {@link Routing}. It provides fluent way how to assign custom {@link Handler} to the routing
 * rule. The rule consists from two main factors - <i>HTTP method</i> and <i>path pattern</i>.
 * <p>
 * The (route) {@link Handler} is a functional interface which process HTTP {@link io.helidon.webserver.ServerRequest request} and
 * writes to the {@link io.helidon.webserver.ServerResponse response}.
 */
public void firstRouting() {
    Routing routing = Routing.builder().post("/post-endpoint", (req, res) -> res.status(Http.Status.CREATED_201).send()).get("/get-endpoint", (req, res) -> res.status(Http.Status.NO_CONTENT_204).send("Hello World!")).build();
    startServer(routing);
}