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 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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import java.io.IOException;

import java.net.ServerSocket;

import java.net.URI;

import jdk.incubator.http.HttpClient;

import jdk.incubator.http.HttpRequest;

import jdk.incubator.http.HttpResponse;

import jdk.incubator.http.HttpTimeoutException;

import java.time.Duration;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.LinkedBlockingQueue;

import static java.lang.System.out;

import static jdk.incubator.http.HttpResponse.BodyHandler.discard;

/**

 * @test

 * @bug 8178147

 * @summary Ensures that small timeouts do not cause hangs due to race conditions

 * @run main/othervm SmallTimeout

 */

// To enable logging use. Not enabled by default as it changes the dynamics

// of the test.

// @run main/othervm -Djdk.httpclient.HttpClient.log=all,frames:all SmallTimeout

public class SmallTimeout {

    static int[] TIMEOUTS = {2, 1, 3, 2, 100, 1};

    // A queue for placing timed out requests so that their order can be checked.

    static LinkedBlockingQueue<HttpRequest> queue = new LinkedBlockingQueue<>();

    static volatile boolean error;

    public static void main(String[] args) throws Exception {

        HttpClient client = HttpClient.newHttpClient();

        try (ServerSocket ss = new ServerSocket(0, 20)) {

            int port = ss.getLocalPort();

            URI uri = new URI("http://127.0.0.1:" + port + "/");

            HttpRequest[] requests = new HttpRequest[TIMEOUTS.length];

            out.println("--- TESTING Async");

            for (int i = 0; i < TIMEOUTS.length; i++) {

                requests[i] = HttpRequest.newBuilder(uri)

                                         .timeout(Duration.ofMillis(TIMEOUTS[i]))

                                         .GET()

                                         .build();

                final HttpRequest req = requests[i];

                CompletableFuture<HttpResponse<Object>> response = client

                    .sendAsync(req, discard(null))

                    .whenComplete((HttpResponse<Object> r, Throwable t) -> {

                        if (r != null) {

                            out.println("Unexpected response: " + r);

                            error = true;

                        }

                        if (t != null) {

                            if (!(t.getCause() instanceof HttpTimeoutException)) {

                                out.println("Wrong exception type:" + t.toString());

                                Throwable c = t.getCause() == null ? t : t.getCause();

                                c.printStackTrace();

                                error = true;

                            } else {

                                out.println("Caught expected timeout: " + t.getCause());

                            }

                        }

                        if (t == null && r == null) {

                            out.println("Both response and throwable are null!");

                            error = true;

                        }

                        queue.add(req);

                    });

            }

            System.out.println("All requests submitted. Waiting ...");

            checkReturn(requests);

            if (error)

                throw new RuntimeException("Failed. Check output");

            // Repeat blocking in separate threads. Use queue to wait.

            out.println("--- TESTING Sync");

            // For running blocking response tasks

            ExecutorService executor = Executors.newCachedThreadPool();

            for (int i = 0; i < TIMEOUTS.length; i++) {

                requests[i] = HttpRequest.newBuilder(uri)

                                         .timeout(Duration.ofMillis(TIMEOUTS[i]))

                                         .GET()

                                         .build();

                final HttpRequest req = requests[i];

                executor.execute(() -> {

                    try {

                        client.send(req, discard(null));

                    } catch (HttpTimeoutException e) {

                        out.println("Caught expected timeout: " + e);

                        queue.offer(req);

                    } catch (IOException | InterruptedException ee) {

                        Throwable c = ee.getCause() == null ? ee : ee.getCause();

                        c.printStackTrace();

                        error = true;

                    }

                });

            }

            System.out.println("All requests submitted. Waiting ...");

            checkReturn(requests);

            executor.shutdownNow();

            if (error)

                throw new RuntimeException("Failed. Check output");

        } finally {

            ((ExecutorService) client.executor()).shutdownNow();

        }

    }

    static void checkReturn(HttpRequest[] requests) throws InterruptedException {

        // wait for exceptions and check order

        for (int j = 0; j < TIMEOUTS.length; j++) {

            HttpRequest req = queue.take();

            out.println("Got request from queue " + req + ", order: " + getRequest(req, requests));

        }

        out.println("Return ok");

    }

    /** Returns the index of the request in the array. */

    static String getRequest(HttpRequest req, HttpRequest[] requests) {

        for (int i=0; i<requests.length; i++) {

            if (req == requests[i]) {

                return "r" + i;

            }

        }

        throw new AssertionError("Unknown request: " + req);

    }

}