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+ /*
+
+ Copyright (C) 2001 Stefan Westerfeld
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+
+ */
+
+#ifndef ARTS_MCOP_DELAYEDRETURN_H
+#define ARTS_MCOP_DELAYEDRETURN_H
+
+#include "arts_export.h"
+
+/*
+ * BC - Status (2002-03-08): DelayedReturn
+ *
+ * This class will be kept binary compatible. It has a private d-pointer for
+ * further extensions.
+ */
+
+namespace Arts {
+
+class AnyConstRef;
+class Buffer;
+class Connection;
+class DelayedReturnPrivate;
+
+/**
+ * The "DelayedReturn" class implements delayed returning from functions.
+ *
+ * For instance, suppose you would like to return from a wait() operation
+ * only after a certain time has passed, without blocking other clients
+ * from using your interface during this time.
+ *
+ * Your implementation (in the skel file) of wait should look like this
+ *
+ * <pre>
+ * static DelayedReturn *delayedReturn = 0;
+ *
+ * bool TimeServer::waitUntil(long time)
+ * {
+ * if(time(0) < time)
+ * {
+ * // ... initialize timer here ...
+ * delayedReturn = Dispatcher::the()->delayReturn();
+ * }
+ * return false;
+ * }
+ *
+ * void timerEvent()
+ * {
+ * delayedReturn->doReturn(true);
+ * }
+ * </pre>
+ *
+ * NOTE: this class breaks for local use (i.e. you can only use it if the
+ * call was a remote call), so it is strongly recommended not to use it
+ * unless there is no alternative (and you should really know what you are
+ * doing, too).
+ */
+class ARTS_EXPORT DelayedReturn {
+friend class Dispatcher;
+private:
+ DelayedReturnPrivate *d;
+
+protected:
+ Buffer *buffer;
+ Connection *connection;
+
+ DelayedReturn();
+ void initialize(Connection *connection, Buffer *buffer);
+ ~DelayedReturn();
+
+public:
+ /**
+ * call this only once to make the request really return
+ */
+ void doReturn(const AnyConstRef& value);
+
+ /**
+ * return without value (for void functions)
+ */
+ void doReturn();
+};
+
+}
+
+#endif /* ARTS_MCOP_DELAYEDRETURN_H */