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/* -*- 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 .
*/
#ifndef __com_sun_star_uno_XWeak_idl__
#define __com_sun_star_uno_XWeak_idl__
#include <com/sun/star/uno/XInterface.idl>
#include <com/sun/star/uno/XAdapter.idl>
//=============================================================================
module com { module sun { module star { module uno {
//=============================================================================
// DocMerge from xml: interface com::sun::star::uno::XWeak
/** the server-side interface to a weak object.
<p>This interface is proxy to the adapted object.
In order to make it possible to have weak references to objects,
the <type>XAdapter</type> interface must be implemented to provide
a weak adapter for the clients.
<h4>Concept of weak referencing:</h4>
</p>
<p>This module specifies the interfaces for implementing and using
weak references.</p>
<p>
</p>
<p>The sense of weak references is to hold a reference to an object
without affecting the lifetime of the object. That means that a weak
reference may become invalid, at any time, if the referenced object dies.
</p>
<p>The following interfaces describe one way to handle weak references
by providing a weak adapter. The weak object has to provide this
adapter if anyone wants to hold a weak reference. To separate their
lifetimes, the adapter and the original object must not share the same
reference counter. The weak reference is in fact only a hard reference
to the adapter, which knows - but does not hold - the original object.
That means that the implementation and synchronization of weak
referencing is the responsibility of the object. The following
interfaces are involved in the concept of weak referencing:
<dl>
<dt>
<type>XWeak</type>
</dt>
<dd>is the server-side interface of the referred object. This
referred object must support the <type>XAdapter</type> interface.
</dd>
<dt>
<type>XReference</type>
</dt>
<dd>is a client-side interface which must be implemented by
the holder of any weak reference. It is used for notification
when the adapted object dies.
</dd>
</dl>
</p>
*/
published interface XWeak: com::sun::star::uno::XInterface
{
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::uno::XWeak::queryAdapter
/** queries the weak adapter.
<p>It is important that the adapter must know, but not hold
the adapted object. If the adapted object dies, all references
to the adapter have to be notified to release the adapter.
</p>
*/
com::sun::star::uno::XAdapter queryAdapter();
};
//=============================================================================
}; }; }; };
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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