Volatile Attributes and Objects

Last modified 19 Dec 2024 00:26 +01:00

Volatile attributes are ones that can change on the resource without midPoint initiating (or even knowing about) that particular change.

Typical Cases

There are several typical cases of volatile attributes. (Some of these do overlap.)

Various kinds of default values can be set up on the object creation. An example is Microsoft Exchange e-mail address that may get a default value based on the policies set up by the Windows system administrator.
An attribute may change unexpectedly when it’s modified by midPoint.

For example, when SMTP:x@y.z is added to the list of Exchange addresses, the former primary e-mail alias (marked by SMTP: prefix) is automatically downgraded to a secondary alias (marked by smtp: prefix). There is a hidden resource-side processing occurring after the change from midPoint is applied.
There may be dependencies between attributes, e.g., LDAP uid may change if the DN changes.
There may be dependencies between attributes of related objects. For example, let’s assume a role has a projection to an LDAP OU and an LDAP group residing in that OU. When the role is renamed, LDAP OU’s distinguished name is changed. This, however, implicitly changes also the group’s DN.

Configuration Options

Attribute-Level Settings

Attribute volatility is specified using the volatility item in the attribute definition.

There are two cases here:

An attribute in question is the volatile one, i.e., it depends on other attributes. This specified as the incoming dependency. Currently, we can specify only the operation, when this dependency occurs: either add, modify, or both. When no operation is specified, both add and modify are assumed.

(Later, it will be possible to provide specific attributes on which this one depends.)

An example:
Listing 1: The uid attribute depends on unspecified ones, during both add and modify operations
```
<objectType>
    <kind>...</kind>
    <intent>...</intent>
    ...
    <attribute>
        <ref>ri:uid</ref>
        ...
        <volatility>
            <incoming>
                <operation>add</operation>
                <operation>modify</operation>
            </incoming>
        </volatility>
    </attribute>
</objectType>
```
An attribute in question is the volatility source for other (volatile) attributes, i.e., those other attributes depend on it. This is specified as outgoing dependency. Currently, we specify only the operation here, and only the modify operation is supported.

(Later, it will be possible to provide specific attributes that depend on this one.)

An example:
Listing 2: The dn attribute change may trigger changes in other attributes
```
<objectType>
    <kind>...</kind>
    <intent>...</intent>
    ...
    <attribute>
        <ref>ri:dn</ref>
        ...
        <volatility>
            <outgoing>
                <operation>modify</operation>
            </outgoing>
        </volatility>
    </attribute>
</objectType>
```
Note that this is a replacement for (now deprecated) volatilityTrigger attribute property.

Object-Level Settings

The `volatility` Property on the Object Type

Currently, the attribute-level settings may not always be sufficient to ensure correct processing of objects with volatile attributes.

An (experimental) volatility object-level property influences processing in the following way:

If set to unpredictable, midPoint reads the current state of the object after any create or modify operation on it. This should help if the attribute-level volatility is not enough. (It should be used in addition to it.)
If set to explosive, midPoint invokes full focus recompute/reconcile after the current operation finishes. This is meant for the hardest situations. It is quite inefficient. But it may be the only option to reliably manage data in some resources.

The `dataBinding` Property on the Dependency Configuration

For example, the configuration below specifies that entitlement/group depends on entitlement/org (see case #4 among typical cases). If entitlement/org changes, the entitlement/group has to be reloaded, as there is potentially an induced change directly on the resource.

Listing 3: Attributes in entitlement/group depends on the ones in entitlement/org

<objectType>
    <kind>entitlement</kind>
    <intent>group</intent>
    ...
    <dependency>
        <kind>entitlement</kind>
        <intent>org</intent>
        <strictness>strict</strictness>
        <dataBinding>some</dataBinding>
    </dependency>
</objectType>

Limitations

The volatile attributes must not deal with any simulated features (like simulated activation) nor associations.

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