third_party/WebKit/LayoutTests/storage/indexeddb/resources/transaction-starvation.js

   1 if (this.importScripts) {
   2     importScripts('../../../resources/js-test.js');
   3     importScripts('shared.js');
   4 }
   5
   6 description("Check that read-only transactions don't starve read-write transactions.");
   7
   8 indexedDBTest(prepareDatabase, runTransactions);
   9
  10 function prepareDatabase(evt)
  11 {
  12     preamble(evt);
  13     evalAndLog("db = event.target.result");
  14     evalAndLog("db.createObjectStore('store')");
  15 }
  16
  17 function runTransactions(evt)
  18 {
  19     preamble(evt);
  20     evalAndLog("db = event.target.result");
  21     debug("");
  22
  23     evalAndLog("readWriteTransactionStarted = false");
  24     evalAndLog("readWriteTransactionComplete = false");
  25
  26     startReadOnlyTransaction();
  27 }
  28
  29
  30 function startReadOnlyTransaction()
  31 {
  32     preamble();
  33     evalAndLog("transaction = db.transaction('store', 'readonly')");
  34     transaction.onabort = unexpectedAbortCallback;
  35     evalAndLog("store = transaction.objectStore('store')");
  36     debug("Keep the transaction alive with an endless series of gets");
  37
  38     function doGet() {
  39         request = store.get(0);
  40         request.onsuccess = function() {
  41             if (!readWriteTransactionStarted)
  42                 startReadWriteTransaction();
  43
  44             if (!readWriteTransactionComplete)
  45                 doGet();
  46         };
  47     }
  48     doGet();
  49 }
  50
  51 function startReadWriteTransaction()
  52 {
  53     preamble();
  54     evalAndLog("transaction = db.transaction('store', 'readwrite')");
  55     transaction.onabort = unexpectedAbortCallback;
  56     evalAndLog("readWriteTransactionStarted = true");
  57     transaction.oncomplete = function readWriteTransactionComplete() {
  58         preamble();
  59         testPassed("Transaction wasn't starved");
  60         evalAndLog("readWriteTransactionComplete = true");
  61         finishJSTest();
  62     };
  63 }