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<?php
/**
* Interface that deferrable updates can implement to signal that updates can be combined.
*
* DeferredUpdates uses this to merge all pending updates of PHP class into a single update
* by calling merge(). Note that upon merge(), the combined update goes to the back of the FIFO
* queue so that such updates occur after related non-mergeable deferred updates. For example,
* suppose updates that purge URLs can be merged, and the calling pattern is:
* - a) DeferredUpdates::addUpdate( $purgeCdnUrlsA );
* - b) DeferredUpdates::addUpdate( $deleteContentUrlsB );
* - c) DeferredUpdates::addUpdate( $purgeCdnUrlsB )
*
* The purges for urls A and B will all happen after the $deleteContentUrlsB update.
*
* @stable to implement
*
* @since 1.27
*/
interface MergeableUpdate extends DeferrableUpdate {
/**
* Merge this update with $update
*
* @param MergeableUpdate $update Update of the same class type
*/
public function merge( MergeableUpdate $update );
}
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