Quelle test_file_repeated_add_delete.html

Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/indexedDB/test/test_file_repeated_add_delete.html

<html>
<head>
  <title>Indexed Database Blob Add/Delete Stress Test</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

  <script type="text/javascript">
  /*
   * This is a stress test which rapidly adds and deletes blobs in a row in
   * separate transactions. Internally, blobs are only removed when all memory
   * and database references drop to zero. At that point an asynchronous
   * delete operation is scheduled which removes the backing file from disk.
   * So the overall behavior and timing depends on cycle collection and
   * garbage collection. The main goal of this test is to make it more likely
   * that internal structures are accessed by multiple threads at the same
   * time, potentially discovering races or other issues.
   *
   * Note that the test needs to always create a new blob and a new
   * transaction, otherwise new backing files wouldn't be created due to
   * internal optimizations for de-duplication.
   */
  function* testSteps()
  {
    const READ_WRITE = "readwrite";

    const name = window.location.pathname;

    const objectStoreName = "Blobs";

    {
      const request = indexedDB.open(name, 1);
      request.onerror = errorHandler;
      request.onupgradeneeded = grabEventAndContinueHandler;
      request.onsuccess = grabEventAndContinueHandler;
    }

    {
      const event = yield undefined;

      is(event.type, "upgradeneeded", "Got correct event type");

      const db = event.target.result;
      db.onerror = errorHandler;

      const objectStore = db.createObjectStore(objectStoreName, {});

      objectStore.add(getRandomBlob(1), 1);
    }

    {
      const event = yield undefined;

      is(event.type, "success", "Got correct event type");

      const db = event.target.result;
      db.onerror = errorHandler;

      let index = 1;

      function doWork() {
        const transaction = db.transaction([objectStoreName], READ_WRITE);

        const objectStore = transaction.objectStore(objectStoreName);

        const deleteRequest = objectStore.delete(index);
        deleteRequest.onsuccess = function () {
          index++;

          const addRequest = objectStore.add(getRandomBlob(1), index);
          addRequest.onsuccess = function () {
            if (index < 1000) {
              doWork();
            } else {
              continueToNextStep();
            }
          };
        };
      }

      doWork();

      yield undefined;
    }

    finishTest();
  }
  </script>
  <script type="text/javascript" src="file.js"></script>
  <script type="text/javascript" src="helpers.js"></script>

</head>

<body onload="runTest();"></body>

</html>

Messung V0.5 in Prozent

¤ Dauer der Verarbeitung: 0.24 Sekunden (vorverarbeitet am 2026-08-25) ¤

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