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java - 评估具有延迟的布尔值，但未正确计时

问题描述

我有一个执行 a 的方法，Runnable然后将完成它所花费的时间传递给另一个方法：

public static void benchmark(Runnable runnable) {
    LocalDateTime before = LocalDateTime.now();
    runnable.run();
    logToDocument(before, LocalDateTime.now());
}

当我使用这种方法来计时网页的加载时，两个时间戳完全相同，即同时发生LocalDateTime before = LocalDateTime.now()，logToDocument(before, LocalDateTime.now())尽管我观察到实际上每个页面加载需要几秒钟。我调用的方法benchmark如下：

public static void subTestDelay(boolean log, boolean condition, int delay, String message) {
    if (log) {
        SoftAssert softAssert = new SoftAssert();
        ExtentTestManager.benchmark(() -> {
            if (!condition) {
               tempData.failStatus();
               softAssert.fail("Timeout after waiting ".concat(String.valueOf(delay)).concat(" seconds for ").concat(message));
           }
        });
        softAssert.assertAll();
    } else {
        Assert.assertTrue(condition, "Timeout after waiting ".concat(String.valueOf(delay)).concat(" seconds for ").concat(message));
    }
}

condition在这种情况下，变量是：

public static boolean expectedPageIsLoaded(WebDriver driver, int seconds, String pageName) {
    final By loadingBar = By.cssSelector("div[class*='progress']");
    final Wait<WebDriver> wait = new FluentWait<>(driver).withTimeout(Duration.ofSeconds(seconds)).pollingEvery(Duration.ofSeconds(1)).ignoring(NoSuchElementException.class).ignoring(NullPointerException.class);
    String originalPageName = driver.findElement(By.tagName("body")).getAttribute("page-name");
    if (originalPageName == null) {
        originalPageName = "no previous page";
        tempData.setAction(tempData.REDIRECT);
        tempData.setArbitraryData(driver,tempData.TRIGGER, tempData.NAVIGATION, tempData.ORIGIN, originalPageName, tempData.DESTINATION, "user authentication");
    }
    ExtentTestManager.log(logger, Level.INFO, "Loading page: ".concat(pageName).concat("; Waiting a maximum of: ").concat(String.valueOf(seconds)).concat(" seconds"));
    try {
        startDateTime = LocalDateTime.now();
        wait.until(ExpectedConditions.presenceOfAllElementsLocatedBy(loadingBar));
        wait.until(wd -> (GenericTestMethods.pageName(wd).equals(pageName) && wd.findElements(loadingBar).size() == 0));
        endDateTime = LocalDateTime.now();
        ExtentTestManager.log(logger, Level.INFO, "Page: ".concat(pageName).concat(" loaded after: ").concat(String.valueOf(Duration.between(startDateTime, endDateTime).toMillis())).concat(" milliseconds"));
        return true;
    } catch (TimeoutException ex) {
        return false;
    }
}

当我连续测试 4 个网页时，我得到了每个页面加载的正确持续时间，如您在此处看到的：

12:35:36.774 [main] INFO  test_classes.base.DriverInit - Loading page: user authentication; Waiting a maximum of: 180 seconds
12:35:39.902 [main] INFO  test_classes.base.DriverInit - Page: user authentication loaded after: 3124 milliseconds
12:35:41.333 [main] INFO  test_classes.base.DriverInit - Loading page: user_cockpit; Waiting a maximum of: 180 seconds
12:35:46.474 [main] INFO  test_classes.base.DriverInit - Page: user_cockpit loaded after: 5140 milliseconds
12:35:47.947 [main] INFO  test_classes.base.DriverInit - Loading page: organization_overview_time_focus; Waiting a maximum of: 180 seconds
12:35:50.013 [main] INFO  test_classes.base.DriverInit - Page: organization_overview_time_focus loaded after: 2066 milliseconds
12:35:51.210 [main] INFO  test_classes.base.DriverInit - Loading page: project_time_overview; Waiting a maximum of: 180 seconds
12:35:52.604 [main] INFO  test_classes.base.DriverInit - Page: project_time_overview loaded after: 1393 milliseconds
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 25.446 s - in TestSuite

此反馈来自以下行boolean expectedPageIsLoaded：

startDateTime = LocalDateTime.now();
    wait.until(ExpectedConditions.presenceOfAllElementsLocatedBy(loadingBar));
    wait.until(wd -> (GenericTestMethods.pageName(wd).equals(pageName) && wd.findElements(loadingBar).size() == 0));
    endDateTime = LocalDateTime.now();
    ExtentTestManager.log(logger, Level.INFO, "Page: ".concat(pageName).concat(" loaded after: ").concat(String.valueOf(Duration.between(startDateTime, endDateTime).toMillis())).concat(" milliseconds"));

但是，我得到的反馈benchmark是每次加载页面之前和之后的两个时间戳，它们总是相同的。为了说明这一点，我修改benchmark为打印出Runnable. 这就是我得到的：

Before loading: 2021-11-03T12:42:42.855008800
After loading: 2021-11-03T12:42:42.855008800
Before loading: 2021-11-03T12:42:51.505117900
After loading: 2021-11-03T12:42:51.505117900
Before loading: 2021-11-03T12:42:55.145636200
After loading: 2021-11-03T12:42:55.145636200
Before loading: 2021-11-03T12:42:57.555875200
After loading: 2021-11-03T12:42:57.555875200

似乎condition在我的subTestDelay方法中得到了正确的评估，但它所花费的实际时间被忽略了。我怀疑这是因为runnable.run()该benchmark方法内部是在另一个线程上执行的，但我缺乏找到解决方案的经验。谁能引导我朝着正确的方向前进？

标签： javaseleniumtimestamprunnable

解决方案

我终于能够解决这个问题了！对于那些感兴趣的人，这就是我所做的。我进行了编辑subTestDelay以采用 aSupplier<Boolean> condition而不是boolean condition. 现在，评估condition.get()是定时的。这似乎是解决问题的原因（不过我不知道为什么）。

subTestDelay现在看起来像这样：

public static void subTestDelay(boolean log, Supplier<Boolean> condition, int delay, String message) {
    String msg = "Timeout after waiting ".concat(String.valueOf(delay)).concat(" seconds for ");
    if (log) {
        Assert.assertTrue(ExtentTestManager.benchmark(() -> {
            if (!condition.get()) {
                tempData.failStatus();
                return false;
            }
            return true;
        }), msg.concat(message));
    } else {
        Assert.assertTrue(condition.get(), msg.concat(message));
    }
}

benchmark还被编辑为采用 aSupplier<Boolean>而不是 a Runnable：

public static boolean benchmark(Supplier<Boolean> supplier) {
    LocalDateTime before = LocalDateTime.now();
    boolean returnValue = supplier.get();
    logToDocument(before, LocalDateTime.now());
    return returnValue;
}

现在，相同的测试产生了正确的结果：

Before loading:2021-11-05T11:08:39.758627100
After loading:2021-11-05T11:08:43.953063700
Before loading:2021-11-05T11:08:45.309372500
After loading:2021-11-05T11:08:52.510232700
Before loading:2021-11-05T11:08:53.963683900
After loading:2021-11-05T11:08:56.048520300
Before loading:2021-11-05T11:08:57.233896600
After loading:2021-11-05T11:08:58.438004100

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