Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 141 insertions, 0 deletions

diff --git a/framework/source/inc/loadenv/actionlockguard.hxx b/framework/source/inc/loadenv/actionlockguard.hxx
new file mode 100644
index 000000000..ee52fcc0d
--- /dev/null
+++ b/framework/source/inc/loadenv/actionlockguard.hxx
@@ -0,0 +1,141 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <com/sun/star/document/XActionLockable.hpp>
+#include <mutex>
+
+namespace framework{
+
+/** @short  implements a guard, which can use the interface
+            <type scope="css::document">XActionLockable</type>.
+
+    @descr  This guard should be used to be sure, that any lock will be
+            released. Otherwise the locked document can hinder the office on shutdown!
+*/
+class ActionLockGuard final
+{
+
+    // member
+
+    private:
+        std::mutex m_mutex;
+
+        /** @short  points to the object, which can be locked from outside. */
+        css::uno::Reference< css::document::XActionLockable > m_xActionLock;
+
+        /** @short  knows if a lock exists on the internal lock object
+                    forced by this guard instance. */
+        bool m_bActionLocked;
+
+    // interface
+
+    public:
+
+        /** @short  default ctor to initialize a "non working guard".
+
+            @descr  That can be useful in cases, where no resource still exists,
+                    but will be available next time. Then this guard can be used
+                    in a mode "use guard for more than one resources".
+         */
+        ActionLockGuard()
+            : m_bActionLocked(false)
+        {
+        }
+
+        /** @short  release this guard instance and make sure, that no lock
+                    will exist afterwards on the internal wrapped resource.
+         */
+        ~ActionLockGuard()
+        {
+            unlock();
+        }
+
+        /** @short  set a new resource for locking at this guard.
+
+            @descr  This call will fail, if an internal resource already exists
+                    and is currently locked.
+
+            @param  xLock
+                    points to the outside resource, which should be locked.
+
+            @return sal_True, if new resource could be set and locked.
+                    sal_False otherwise.
+         */
+        bool setResource(const css::uno::Reference< css::document::XActionLockable >& xLock)
+        {
+            std::unique_lock g(m_mutex);
+
+            if (m_bActionLocked || !xLock.is())
+                return false;
+
+            m_xActionLock = xLock;
+            m_xActionLock->addActionLock();
+            m_bActionLocked = m_xActionLock->isActionLocked();
+
+            return true;
+        }
+
+        /** @short  set a new resource for locking at this guard.
+
+            @descr  This call will fail, if an internal resource already exists
+                    and is currently locked.
+
+            @param  xLock
+                    points to the outside resource, which should be locked.
+
+            @return sal_True, if new resource could be set and locked.
+                    sal_False otherwise.
+         */
+        void freeResource()
+        {
+            // SAFE -> ..........................
+            std::unique_lock aMutexLock(m_mutex);
+
+            css::uno::Reference< css::document::XActionLockable > xLock   = m_xActionLock;
+            bool                                                  bLocked = m_bActionLocked;
+
+            m_xActionLock.clear();
+            m_bActionLocked = false;
+
+            aMutexLock.unlock();
+            // <- SAFE ..........................
+
+            if (bLocked && xLock.is())
+                xLock->removeActionLock();
+        }
+
+        /** @short  unlock the internal wrapped resource, if it's not already done. */
+        void unlock()
+        {
+            std::unique_lock g(m_mutex);
+            if (m_bActionLocked && m_xActionLock.is())
+            {
+                m_xActionLock->removeActionLock();
+                // don't check for any locks here ...
+                // May another guard use the same lock object :-(
+                m_bActionLocked = false;
+            }
+        }
+};
+
+} // namespace framework
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */