Carsten Brandt 711498f93a Cache user assignments to avoid unnecessary DB queries (#14696) ...

* Cache user assignments to avoid unnecessary DB queries

alternative to #9138 and #10981, only cache on `checkAccess` call which is usually
called on every request. Cache is not necessary in RBAC management.

Similar to #14061 but includes proper cache invalidation and test.

`getAssignments()` always queries the DB. The cache is only applied on
`checkAccess` calls, and invalidated as soon as the RBAC structure is
modified through the manager component (verified by the test case).

Regarding [concerns of memory usage](https://github.com/yiisoft/yii2/pull/14061#issuecomment-297982502)
if used in batch mode on multiple users, you can call
`invalidateCache()` method if this really causes a problem.

fixes #7743
close #9138
close #14061
close #10981

See also
- https://github.com/yiisoft/yii2/issues/7626#issuecomment-77745166
- https://github.com/yiisoft/yii2/pull/14061#issuecomment-319645488

* improve test naming

* fix tests

* fix assignment cache for non-scalar user-ids

2017-09-01 10:50:36 +02:00

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