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Diffstat (limited to 'docs/deferred.txt')
| -rw-r--r-- | docs/deferred.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/docs/deferred.txt b/docs/deferred.txt new file mode 100644 index 00000000..445eb0e4 --- /dev/null +++ b/docs/deferred.txt @@ -0,0 +1,19 @@ + +deferred.txt + +A few of the database updates required by various functions here +can be deferred until after the result page is displayed to the +user. For example, updating the view counts, updating the +linked-to tables after a save, etc. PHP does not yet have any +way to tell the server to actually return and disconnect while +still running these updates (as a Java servelet could), but it +might have such a feature in the future. + +We handle these by creating a deferred-update object (in a real +O-O language these would be classes that implement an interface) +and putting those objects on a global list, then executing the +whole list after the page is displayed. We don't do anything +smart like collating updates to the same table or such because +the list is almost always going to have just one item on it, if +that, so it's not worth the trouble. + |