third_party/WebKit/LayoutTests/storage/websql/read-transactions-running-concurrently.html

   1 <html>
   2 <head>
   3 <script>
   4
   5 function log(message)
   6 {
   7     document.body.innerHTML += message + "<br>";
   8 }
   9
  10 function terminateTest()
  11 {
  12     if (window.testRunner)
  13         testRunner.notifyDone();
  14 }
  15
  16 function openTestDatabase()
  17 {
  18     return openDatabase("ReadTransactionsRunningConcurrentlyTest",
  19                         "1.0",
  20                         "Test to make sure that multiple read transactions on different DB handles to the same DB run concurrently.",
  21                         32768);
  22 }
  23
  24 var readTransactionsInProgress = 0;
  25 var done = false;
  26
  27 function runReadTransaction(db)
  28 {
  29
  30     db.readTransaction(
  31         function(tx) {
  32             ++readTransactionsInProgress;
  33             if (readTransactionsInProgress === 2) {
  34                 log("Read transactions running concurrently.");
  35                 done = true;
  36             }
  37
  38             (function spin() {
  39                 if (done)
  40                     return;
  41                 tx.executeSql("SELECT ? AS zero", [0], spin,
  42                     errorHandler("execute failed"));
  43             }());
  44         },
  45         errorHandler("Read transaction failed"),
  46         function() {
  47             readTransactionsInProgress--;
  48             if (readTransactionsInProgress === 0)
  49                 terminateTest();
  50         });
  51 }
  52
  53 function errorHandler(message) {
  54     return function(error) {
  55         log(message + ": " + error.message);
  56         terminateTest();
  57     };
  58 }
  59
  60 function runTest() {
  61     if (window.testRunner) {
  62         testRunner.clearAllDatabases();
  63         testRunner.dumpAsText();
  64         testRunner.waitUntilDone();
  65     }
  66
  67     try {
  68         var db1 = openTestDatabase();
  69         var db2 = openTestDatabase();
  70         db1.transaction(
  71             function(tx) {
  72                 tx.executeSql("CREATE TABLE IF NOT EXISTS Test (Foo int);");
  73             },
  74             errorHandler("Cannot create the Test table"),
  75             function() {
  76                 runReadTransaction(db1);
  77                 runReadTransaction(db2);
  78             });
  79      } catch(err) { log(err); }
  80 }
  81 </script>
  82 </head>
  83 <body onload="runTest();">
  84 This test tests that two read-only transactions on different handles to the same database run concurrently.<br>
  85 </body>
  86 </html>