1 files changed, 131 insertions, 0 deletions
diff --git a/sd/source/ui/tools/TimerBasedTaskExecution.cxx b/sd/source/ui/tools/TimerBasedTaskExecution.cxx
new file mode 100644
index 0000000000..bfd2e2fae5
--- /dev/null
+++ b/sd/source/ui/tools/TimerBasedTaskExecution.cxx
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <tools/TimerBasedTaskExecution.hxx>
+#include <tools/AsynchronousTask.hxx>
+#include <tools/time.hxx>
+#include <sal/log.hxx>
+#include <memory>
+#include <utility>
+
+namespace sd::tools {
+
+/** Used by the shared_ptr instead of the private destructor.
+*/
+class TimerBasedTaskExecution::Deleter
+{
+public:
+    void operator() (TimerBasedTaskExecution* pObject)
+    {
+        delete pObject;
+    }
+};
+
+std::shared_ptr<TimerBasedTaskExecution> TimerBasedTaskExecution::Create (
+    const std::shared_ptr<AsynchronousTask>& rpTask,
+    sal_uInt32 nMillisecondsBetweenSteps,
+    sal_uInt32 nMaxTimePerStep)
+{
+    std::shared_ptr<TimerBasedTaskExecution> pExecution(
+        new TimerBasedTaskExecution(rpTask,nMillisecondsBetweenSteps,nMaxTimePerStep),
+        Deleter());
+    // Let the new object have a shared_ptr to itself, so that it can
+    // release itself when the AsynchronousTask has been executed
+    // completely.
+    if (pExecution->mpTask != nullptr)
+        pExecution->mpSelf = pExecution;
+    return pExecution;
+}
+
+void TimerBasedTaskExecution::Release()
+{
+    maTimer.Stop();
+    mpSelf.reset();
+}
+
+//static
+void TimerBasedTaskExecution::ReleaseTask (
+    const std::weak_ptr<TimerBasedTaskExecution>& rpExecution)
+{
+    if (  rpExecution.expired())
+        return;
+
+    try
+    {
+        std::shared_ptr<tools::TimerBasedTaskExecution> pExecution (rpExecution);
+        pExecution->Release();
+    }
+    catch (const std::bad_weak_ptr&)
+    {
+        // When a bad_weak_ptr has been thrown then the object pointed
+        // to by rpTask has been released right after we checked that it
+        // still existed.  Too bad, but that means, that we have nothing
+        // more do.
+    }
+}
+
+TimerBasedTaskExecution::TimerBasedTaskExecution (
+    std::shared_ptr<AsynchronousTask> pTask,
+    sal_uInt32 nMillisecondsBetweenSteps,
+    sal_uInt32 nMaxTimePerStep)
+    : mpTask(std::move(pTask)),
+      maTimer("sd TimerBasedTaskExecution maTimer"),
+      mnMaxTimePerStep(nMaxTimePerStep)
+{
+    maTimer.SetInvokeHandler( LINK(this,TimerBasedTaskExecution,TimerCallback) );
+    maTimer.SetTimeout(nMillisecondsBetweenSteps);
+    maTimer.Start();
+}
+
+TimerBasedTaskExecution::~TimerBasedTaskExecution()
+{
+    maTimer.Stop();
+}
+
+IMPL_LINK_NOARG(TimerBasedTaskExecution, TimerCallback, Timer *, void)
+{
+    if (mpTask == nullptr)
+        return;
+
+    if (mpTask->HasNextStep())
+    {
+        // Execute as many steps as fit into the time span of length
+        // mnMaxTimePerStep.  Note that the last step may take longer
+        // than allowed.
+        sal_uInt32 nStartTime (::tools::Time( ::tools::Time::SYSTEM ).GetMSFromTime());
+        SAL_INFO("sd.tools", __func__ << ": starting TimerBasedTaskExecution at " << nStartTime);
+        do
+        {
+            mpTask->RunNextStep();
+            sal_uInt32 nDuration (::tools::Time( ::tools::Time::SYSTEM ).GetMSFromTime()-nStartTime);
+            SAL_INFO("sd.tools", __func__ << ": executed step in " << nDuration);
+            if (nDuration > mnMaxTimePerStep)
+                break;
+        }
+        while (mpTask->HasNextStep());
+        SAL_INFO("sd.tools", __func__ << ": TimerBasedTaskExecution sleeping");
+        maTimer.Start();
+    }
+    else
+        mpSelf.reset();
+}
+
+} // end of namespace ::sd::tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */