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// $Id: DisseminationUpdate.nc,v 1.6 2010-06-29 22:07:47 scipio Exp $
/*
* Copyright (c) 2006 Stanford University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
* - Neither the name of the copyright holder nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Update a network shared (disseminated) value. Updates are assured
* to be eventually consistent across a connected network. If multiple
* nodes update a value simultaneously, then nodes within the network
* will see a series of one or more updates, the last update will
* be the same for all nodes. Components that need to use the
* variable should use the DisseminationValue interface.
*
* @author Philip Levis
* @author Gilman Tolle
* @date January 7 2006
*/
interface DisseminationUpdate<t> {
/**
* Update the variable to a new value. This changes the local copy
* and begins to disseminate the new value throughout the network.
* As other nodes may have also changed the variable, it is possible
* that an update may not 'stick,' but will instead be overwritten by
* a separate update.
*
* @param newVal A pointer to the new value. The memory pointed to
* by newVal is copied out, so newVal can be reclaimed when
* <tt>change</tt> returns.
*/
command void change(t* ONE newVal);
}
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