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MXS-1401 Support multiple cache rules

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The possibility to have multiple cache rules in a cache
configuration file is now handled throughout the cache
filter.

The major difference is that while you earlier directly
queried the Cache whether data should be stored to the
cache and whether data in the cache should be used, you
now query the Cache whether data should be stored to the
cache and, if so, get a CacheRules object from which you
subsequently query whether data from the cache should
be used.
This commit is contained in:
Johan Wikman
2018-04-24 18:23:49 +03:00
parent 605f771518
commit a3a8b5523e
15 changed files with 249 additions and 166 deletions
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20
Documentation/Filters/Cache.md
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@ -481,13 +481,14 @@ SET @maxscale.cache.populate=false;
# Rules
The caching rules are expressed as a JSON object.
The caching rules are expressed as a JSON object or as an array
of JSON objects.
There are two decisions to be made regarding the caching; in what circumstances
should data be stored to the cache and in what circumstances should the data in
the cache be used.
In the JSON object this is visible as follows:
Expressed in JSON this looks as follows
```
{
@ -495,12 +496,27 @@ In the JSON object this is visible as follows:
use: [ ... ]
}
```
or, in case an array is used, as
```
[
{
store: [ ... ],
use: [ ... ]
},
{ ... }
]
```
The `store` field specifies in what circumstances data should be stored to
the cache and the `use` field specifies in what circumstances the data in
the cache should be used. In both cases, the value is a JSON array containg
objects.
If an array of rule objects is specified, then, when looking for a rule that
matches, the `store` field of each object are evaluated in sequential order
until a match is found. Then, the `use` field of that object is used when
deciding whether data in the cache should be used.
## When to Store
By default, if no rules file have been provided or if the `store` field is