tdf#116983 tdf#136175: retry if failed

Debugging the test case from the latter bug report shows that indeed
the call to OleGetClipboard may fail first time, as jasonkres had
suspected in the former bug. So follow the suggestion in tdf#116983,
and retry the failing calls several times in case of failure.

Many thanks to Telesto for preparing a clear bug report with reliable
test case.

Co-authored-by: jasonkres

Change-Id: Ib3c497da830bc5faac586bcfe1eededa54bfa117
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111825
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/sal/qa/systools/test_retry_if_failed.cxx b/sal/qa/systools/test_retry_if_failed.cxx
new file mode 100644
index 000000000000..845cba83092d
--- /dev/null
+++ b/sal/qa/systools/test_retry_if_failed.cxx
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/plugin/TestPlugIn.h>
+#include <systools/win32/retry_if_failed.hxx>
+
+namespace test_systools
+{
+class test_retry_if_failed : public CppUnit::TestFixture
+{
+public:
+    void test_success()
+    {
+        const DWORD nTicksBefore = GetTickCount();
+        HRESULT hr = sal::systools::RetryIfFailed(10, 100, Tester(5));
+        const DWORD nTicksAfter = GetTickCount();
+        const DWORD nTicksElapsed = nTicksAfter > nTicksBefore ? nTicksAfter - nTicksBefore
+                                                               : std::numeric_limits<DWORD>::max()
+                                                                     - nTicksBefore + nTicksAfter;
+        CPPUNIT_ASSERT(SUCCEEDED(hr));
+        CPPUNIT_ASSERT(nTicksElapsed >= 400); // 5 attempts, 4 sleeps by 100 ms
+    }
+
+    void test_failure()
+    {
+        const DWORD nTicksBefore = GetTickCount();
+        HRESULT hr = sal::systools::RetryIfFailed(10, 100, Tester(15));
+        const DWORD nTicksAfter = GetTickCount();
+        const DWORD nTicksElapsed = nTicksAfter > nTicksBefore ? nTicksAfter - nTicksBefore
+                                                               : std::numeric_limits<DWORD>::max()
+                                                                     - nTicksBefore + nTicksAfter;
+        CPPUNIT_ASSERT(FAILED(hr));
+        CPPUNIT_ASSERT(nTicksElapsed >= 900); // 10 attempts, 9 sleeps by 100 ms
+    }
+
+    CPPUNIT_TEST_SUITE(test_retry_if_failed);
+    CPPUNIT_TEST(test_success);
+    CPPUNIT_TEST(test_failure);
+    CPPUNIT_TEST_SUITE_END();
+
+private:
+    struct Tester
+    {
+        Tester(unsigned triesBeforeSuccess)
+            : m_nTriesBeforeSuccess(triesBeforeSuccess)
+        {
+        }
+
+        HRESULT operator()()
+        {
+            return ++m_nTriesAttempted >= m_nTriesBeforeSuccess ? S_OK : E_FAIL;
+        }
+
+        unsigned m_nTriesBeforeSuccess;
+        unsigned m_nTriesAttempted = 0;
+    };
+};
+
+CPPUNIT_TEST_SUITE_REGISTRATION(test_systools::test_retry_if_failed);
+
+} // namespace test_systools
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */