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New API added to PrimaryDataStoreDriver that can be returned to CloudStack clients

In order to help a GUI UI perform checking on the value of a given key as well as what keys are applicable, we intend to add a method to the PrimaryDataStoreDriver interface with the following interface:

List<StringMap<String, String> getPropertiesAndTypes();

The key of the returned list map is a String representing a given property that is supported by the plug-in. For example, "burstIops". These are vendor specific and have no meaning to CloudStack.

The value of the returned list map is a String representing the type of the property. For example, "Integer", "Float", "String". All supported types will be listed as public static final member variables in the PrimaryDataStoreDriver interface.

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A new API will be added to CloudStack that returns such a list map for a given storage plug-in. With the above information, the client application a UI could display to the admin all applicable properties and perform basic type checking on assigned values based on returned types.

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