ProxyUpdateType

Basics

There are three different interface scenarios that can be configured for every single Proxy Prop-erty

Master
Client
Bi-directional

This Interface direction as well as the conflict solving mechanism must be configureable on the Relation between MetaProxy and ProxyMetaProperty.

Master

As the Proxy Property is defined as a Master, the value is always exported from UBIK. The value will never be imported. Changes from the external system will always be discarded.

Client

As the Proxy Property is defined as a Client, the value is always be updated during an import from the 3rd party system. The value will never be exported. Changes in UBIK will always be dis-carded.

Bi-Directional

As the Proxy Property is defined as export/import “Bi-Directional” the Proxy supports both, exporting and importing the Property value. During the processing conflicts must be recog-nized. A conflict is as the property was changed in UBIK AND in the external system. There are two different Conflict scenarios:

Solve the conflict according the Timestamp information: the newest change wins agains the older one.
Manual solve: mark the object and let the user solve the “problem”

Conflict solving scenario: Timestamp

As a MetaProxyProperty is defined to import/export it's value bidirectional, the Timestamp information is used for determine whether a value may be overwritten by an import or must be exported by an export.

The Timstamp - conflict scenario only works properly as the Value Change log is activated for the target property !

Import:

A value is updated during an import when the Import Timestamp (on the proxy) is greater (newer) than the Update timestamp of the target property.
The Import Timestamp is set as new Update Timestamp of the bidirectional target property.

You can find a ChangeLog entry even for properties of "new" created UBIK instances as they are configured as bidirectional and were created during an import process!

Export:

The Update Timestamp of the ubik property which is exported will be used as Export Timestamp on the Proxy instance.