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Added volatility to entities, to enable cacheing.

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Simon Brooke 2018-06-30 12:53:08 +01:00
parent 7ea6b5f299
commit a4e0fd1c9a
5 changed files with 87 additions and 141 deletions
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22
resources/schemas/adl-1.4.1.dtd
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@ -246,7 +246,7 @@ that we can allow HTML block level entities within content elements -->
an entity which has properties and relationships; maps onto a database
table or a Java serialisable class - or, of course, various other things
name: obviously, the name of this entity
name: obviously, the name of this entity.
natural-key: if present, the name of a property of this entity which forms
a natural primary key [NOTE: Only partly implemented. NOTE: much of
the present implementation assumes all primary keys will be
@ -254,21 +254,27 @@ that we can allow HTML block level entities within content elements -->
'key' element, below.
table: the name of the table in which this entity is stored. Defaults to same
as name of entity. Strongly recommend this is not used unless it needs
to be different from the name of the entity
to be different from the name of the entity.
foreign: this entity is part of some other system; no code will be generated
for it, although code which links to it will be generated
for it, although code which links to it will be generated.
magnitude: The power of ten which approximates the expected number of records; thus
if ten records are expected, the magnitude is 1; if a million, the
magnitude is 6
magnitude is 6.
volatility: Number representing the anticipated rate of change of records in this
entity; if 0, results should never be cached; otherwise, a power of
10 representing the number of seconds the data may safely be cached.
thus 5 represents a cach time to live of 100,000 seconds, or slightly
more than one day.
-->
<!ELEMENT entity ( documentation?, prompt*, content?, key?,
property*, permission*, (form | page | list)*)>
<!ATTLIST entity
name CDATA #REQUIRED
name CDATA #REQUIRED
natural-key CDATA #IMPLIED
table CDATA #IMPLIED
foreign %Boolean; #IMPLIED
magnitude CDATA #IMPLIED>
table CDATA #IMPLIED
foreign %Boolean; #IMPLIED
magnitude CDATA #IMPLIED
volatility CDATA #IMPLIED>
<!--
contains documentation on the element which immediately contains it. TODO: