The Tor Browser: dom/indexedDB/test/unit/test_writer_starvation.js@b8a032363ba2 (annotated)

dom/indexedDB/test/unit/test_writer_starvation.js@b8a032363ba2 (annotated)

dom/indexedDB/test/unit/test_writer_starvation.js

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /**
  * Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 if (!this.window) {
   this.runTest = function() {
     todo(false, "Test disabled in xpcshell test suite for now");
     finishTest();
   }
 }
 var testGenerator = testSteps();
 function testSteps()
 {
   const name = this.window ? window.location.pathname : "Splendid Test";
   // Needs to be enough to saturate the thread pool.
   const SYNC_REQUEST_COUNT = 25;
   let request = indexedDB.open(name, 1);
   request.onerror = errorHandler;
   request.onupgradeneeded = grabEventAndContinueHandler;
   request.onsuccess = grabEventAndContinueHandler;
   let event = yield undefined;
   let db = event.target.result;
   db.onerror = errorHandler;
   is(event.target.transaction.mode, "versionchange", "Correct mode");
   let objectStore = db.createObjectStore("foo", { autoIncrement: true });
   request = objectStore.add({});
   request.onerror = errorHandler;
   request.onsuccess = grabEventAndContinueHandler;
   event = yield undefined;
   let key = event.target.result;
   ok(key, "Got a key");
   yield undefined;
   let continueReading = true;
   let readerCount = 0;
   let writerCount = 0;
   let callbackCount = 0;
   // Generate a bunch of reads right away without returning to the event
   // loop.
   info("Generating " + SYNC_REQUEST_COUNT + " readonly requests");
   for (let i = 0; i < SYNC_REQUEST_COUNT; i++) {
     readerCount++;
     let request = db.transaction("foo").objectStore("foo").get(key);
     request.onsuccess = function(event) {
       is(event.target.transaction.mode, "readonly", "Correct mode");
       callbackCount++;
     };
   }
   while (continueReading) {
     readerCount++;
     info("Generating additional readonly request (" + readerCount + ")");
     let request = db.transaction("foo").objectStore("foo").get(key);
     request.onsuccess = function(event) {
       callbackCount++;
       info("Received readonly request callback (" + callbackCount + ")");
       is(event.target.transaction.mode, "readonly", "Correct mode");
       if (callbackCount == SYNC_REQUEST_COUNT) {
         writerCount++;
         info("Generating 1 readwrite request with " + readerCount +
              " previous readonly requests");
         let request = db.transaction("foo", "readwrite")
                         .objectStore("foo")
                         .add({}, readerCount);
         request.onsuccess = function(event) {
           callbackCount++;
           info("Received readwrite request callback (" + callbackCount + ")");
           is(event.target.transaction.mode, "readwrite", "Correct mode");
           is(event.target.result, callbackCount,
              "write callback came before later reads");
         }
       }
       else if (callbackCount == SYNC_REQUEST_COUNT + 5) {
         continueReading = false;
       }
     };
     setTimeout(function() { testGenerator.next(); }, writerCount ? 1000 : 100);
     yield undefined;
   }
   while (callbackCount < (readerCount + writerCount)) {
     executeSoon(function() { testGenerator.next(); });
     yield undefined;
   }
   is(callbackCount, readerCount + writerCount, "All requests accounted for");
   finishTest();
   yield undefined;
 }