Changes
This page describes the timestamps that are relevant and their relevance for the role of a service engineer. There In UBIK, there are more different types of timestamps used internally , but these should are not be mentioned here. There for Therefore it is best to understand timestamps in UBIK from a non-developer perspective: From this view , we care about 5 different timestamp names and their usage on 4 levels: '''CreationTimeStamp''', '''UpdateTimeStamp''', '''ValidationTimeStamp''', '''ExportTimeStamp ''', and '''ImportTimeStamp'''. The usages are best explained when assigning these timestamps to different levels where they are used:*On Object(instance)level: cts (CreationTimeStamp), uts (UpdateTimeStamp)*On Propertylevel: vts (ValidationTimeStamp), CTS, UTS*On Proxylevel: ets (ExportTimeStamp), its (ImportTimeStamp)*On ProxyPropertylevel: ets (ExportTimeStamp), its (ImportTimeStamp)
Their usages are best explained when assigning these timestamps to different levels where they are used:* On Object (instance) level: '''CTS''' (CreationTimeStamp), '''UTS''' (UpdateTimeStamp)* On Property level: '''VTS''' (ValidationTimeStamp), '''CTS''', '''UTS'''* On Proxy level: '''ETS''' (ExportTimeStamp), '''ITS''' (ImportTimeStamp)* On ProxyProperty level: '''ETS''' (ExportTimeStamp), '''ITS''' (ImportTimeStamp) == On ObjectLevel Object Level / BaseClass ==
=== CreationTimeStamp ===
Saves the date and time when an object is created.
The CreationTimeStamp (ctsCTS) is set exactly once and in at that moment when a new Ubikle is instantiated in the working memory. This time stamp timestamp will never be changed by UBIK. This timestamp does not denote when the Ubikle was written to the database eventually.
=== UpdateTimeStamp ===
Saves the date and time when an object has been changed. If the UTS is null or “01.01.0001 00:00:00” then return , the CTSis returned.
A change is defined by two events:
<ol>
<li>When the The object changes , the ''UpdateTimeStamp '' is set. An object is meant to be changed when at least one of its properties has been changed. To know this , every property will be asked if it has been changed or not (properties hold this information by themselves). A change of a property means either:
<ol style="list-style-type:lower-alpha">
<li>it’s its value has been changed (the property knows its new and old value),</li> <li>it’s its ValidationTimeStamp has been set</li>
</ol>
</li>
<li>When a A new primary child is added to a relation. Primary in this context means the first level of object relation, aka the directly connected object so to say. That means adding such a child counts as a change for the owner object , and the ''UpdateTimeStamp '' will be set. A child can be anything (Attributes, RelationdataRelationData, etc).</li>
</ol>
# the TimeStamp of the LastChange from the PropertyValueChangeLog if the PropertyValueChangeLog is available or
# the property’s UBIKAttribute.UpdateTimeStamp
=== CTS ===
It is sufficient that an existing value is checked on the client. This can be for example by simply pressing an OK button.
== On ProxyPropertyLevel ProxyProperty Level / ProxyAttribute ==
=== InterfaceTimestamp ===
This timestamp actually becomes transformed to the ets '''ETS''' or its so '''ITS''', resulting in it exists existing twice.
'''ExportTimeStamp (ETS)'''
Saves the UTS of a property of an Ubikle so that a third party system knows when the value has been changed.
If UBIK cannot find the property set the ''InterfaceTimeStamp '' to now.
'''ImportTimeStamp (ITS)'''
Saves a given timestamp for a property provided by the third-party system.
== On ProxyLevel Proxy Level / Proxy ==
=== ImportTimeStamp ===
Saves the date and time when an Ubikle has been written to a proxy.
