offapi/com/sun/star/util/XCloseable.idl

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  27 #ifndef __com_sun_star_util_XClosable_idl__
  28 #define __com_sun_star_util_XClosable_idl__
  29
  30 #ifndef __com_sun_star_uno_XInterface_idl__
  31 #include <com/sun/star/uno/XInterface.idl>
  32 #endif
  33
  34 #ifndef __com_sun_star_util_XCloseBroadcaster_idl__
  35 #include <com/sun/star/util/XCloseBroadcaster.idl>
  36 #endif
  37
  38 //=============================================================================
  39
  40 module com {  module sun {  module star {  module util {
  41
  42 //=============================================================================
  43 /** makes it possible to release any objects in a ordered manner by using
  44     a two-step mechanism
  45
  46     <p>
  47     If an object should be terminated, it can be:<br>
  48     <ul>
  49         <li>disposed (if it supports <member scope="com::sun::star::lang">XComponent::dispose()</member>)</li>
  50         <li>closed   (if it supports <member>XCloseable::close()</member>)</li>
  51     </ul>
  52     First version gives the object no chance to disagree with that (e.g. if a
  53     process is still running and can't be cancelled realy). Last version
  54     provides this possibility, but can't guarantee real termination of called object.
  55     It depends from the environment of an object, if one or both mechanism are neccessary.
  56     </p>
  57
  58     <p>
  59     Base interface <type>XCloseBroadcaster</type> makes it possible that any listener
  60     which is interrested on life time of listened object ...
  61     <ul>
  62         <li>can get a notification about closing of it</li>
  63         <li>or can have a veto to break that.</li>
  64     </ul>
  65     </p>
  66
  67     @see com::sun::star::lang::XComponent::dispose()
  68     @see XCloseBroadcaster
  69     @see XCloseListener
  70  */
  71 published interface XCloseable: XCloseBroadcaster
  72 {
  73     //-------------------------------------------------------------------------
  74     /** try to close the object
  75
  76         <p>
  77         Must definitly be called before <member scope="com::sun::star::lang">XComponent::dispose()</member>.
  78         But nobody can guarentee real closing of called object - because it can disagree with that if any
  79         still running processes can't be cancelled yet. It's not allowed to block this call till internal
  80         operations will be finished here. They must be cancelled or call must return imediatly by throwing
  81         the <type>CloseVetoException</type>.  Otherwise (if nothing exist to disagree) it must return normaly.
  82         </p>
  83
  84         <p>
  85         Before any internal processes will be cancelled, all registered <type>XCloseListener</type>
  86         must be notified. Any of them can disagree with a <type>CloseVetoException</type> too.
  87         It's forbidden to catch this exception inside the called close() method because the caller must
  88         get this information!
  89         </p>
  90
  91         <p>
  92         If somewhere disagree with a CloseVetoException it will not clear who has to close the object again
  93         after still running processes was finished. The parameter <var>DeliverOwnership</var> regulate that.
  94         If it is set to <FALSE/> the caller of the method close() will be the owner of this object in every case.
  95         Then it's not allowed to call close() from any other place (may a registered XCloseListener).
  96         If it is set to <TRUE/> the caller gives up his ownership. If a XCloseListener throw the veto exception
  97         he will be the new owner of the closing object. This information is passed to the listener by a parameter of
  98         his notification method <member>XCloseListener::queryClosing()</member>. After his operations was finished
  99         he MUST try to close it again. If the closing object itselfs disagree by an exception and the parameter
 100         <var>DeliverOwnership</var> was set to <TRUE/> the object will be his own owner with all consequences of that.
 101         <br><strong>Note:</strong><br>
 102         There is no way to get the ownership back if it was delivered!
 103         </p>
 104
 105         <p>
 106         If this method was already called on an object it should return without any reaction. Normaly it's possible to throw
 107         a <type scope="com::sun::star::lang">DisposedException</type> for already disposed or closed objects
 108         (which represent a <type scope="com::sun::star::uno">RuntimeException</type> and can be thrown by every interface call),
 109         but it shouldn't be used here. The veto exception should be the only way to indicates the result.
 110         </p>
 111
 112         @param DeliverOwnership
 113                 <TRUE/> delegates the ownership of ths closing object to any one which throw the CloseVetoException.
 114                 This new owner has to close the closing object again if his still running processes will be finished.
 115                 <br>
 116                 <FALSE/> let the ownership at the original one which called the close() method. He must react for possible
 117                 CloseVetoExceptions and try it again at a later time. This can be usefull for a generic UI handling.
 118
 119         @throws CloseVetoException
 120             indicates that the closing object himself or any of his currently registered listener disagree with this close() request.
 121
 122         @see XCloseListener
 123         @see CloseVetoException
 124         @see com::sun::star::lang::XComponent::dispose()
 125         @see com::sun::star::lang::DisposedException
 126      */
 127     void close( [in] boolean DeliverOwnership )
 128             raises( CloseVetoException );
 129 };
 130
 131 //=============================================================================
 132
 133 }; }; }; };
 134
 135 #endif