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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _SALHELPER_FUTUREQUEUE_HXX_
+#define _SALHELPER_FUTUREQUEUE_HXX_
+
+#include <sal/types.h>
+#include <rtl/ref.hxx>
+#include <osl/mutex.hxx>
+#include <salhelper/future.hxx>
+#include <salhelper/queue.hxx>
+
+namespace salhelper
+{
+
+//----------------------------------------------------------------------------
+
+#ifndef SALHELPER_COPYCTOR_API
+#define SALHELPER_COPYCTOR_API(C) C (const C&); C& operator= (const C&)
+#endif
+
+//----------------------------------------------------------------------------
+
+template<class element_type>
+class FutureQueue : protected osl::Mutex
+{
+ /** Representation.
+ */
+ typedef salhelper::Future<element_type> future_type;
+
+ salhelper::QueueBase< rtl::Reference<future_type> > m_aDelayed;
+ salhelper::QueueBase< rtl::Reference<future_type> > m_aPresent;
+
+ /** Not implemented.
+ */
+ SALHELPER_COPYCTOR_API(FutureQueue<element_type>);
+
+public:
+ /** Construction.
+ */
+ inline FutureQueue()
+ {}
+
+ /** Destruction.
+ */
+ inline ~FutureQueue()
+ {}
+
+ /** Enqueue element at queue tail.
+ */
+ inline void put (const element_type& element)
+ {
+ osl::MutexGuard aGuard (*this);
+
+ rtl::Reference<future_type> xFuture (m_aDelayed.get());
+ if (!xFuture.is())
+ {
+ xFuture = new future_type();
+ m_aPresent.put (xFuture);
+ }
+ xFuture->set (element);
+ }
+
+ /** Dequeue a future to element at queue head.
+ */
+ inline rtl::Reference< salhelper::Future<element_type> > get()
+ {
+ osl::MutexGuard aGuard (*this);
+
+ rtl::Reference<future_type> xFuture (m_aPresent.get());
+ if (!xFuture.is())
+ {
+ xFuture = new future_type();
+ m_aDelayed.put (xFuture);
+ }
+ return (xFuture);
+ }
+};
+
+//----------------------------------------------------------------------------
+
+} // namespace salhelper
+
+#endif /* !_SALHELPER_FUTUREQUEUE */