Cache

class trytond.cache.Cache(name[, size_limit[, context]])

The class is used to cache values between server requests. The name should be unique and it’s used to identify the cache. We usually use <class_name>.<content_name> to make it unique. The size_limit field can be used to limit the number of values cached and the context parameter is used to indicate if the cache depends on the user context and is true by default. The cache is cleaned on Transaction starts and resets on Transaction commit or rollback.

Warning

As there is no deepcopy of the values cached, they must never be mutated after being set in or retrieved from the cache.

trytond.cache.get(key[, default])

Retrieve the value of the key in the cache. If a default is specified it will be returned when the key is missing otherwise it will return None.

trytond.cache.set(key, value)

Sets the value of the key in the cache.

trytond.cache.clear()

Clears all the keys in the cache.

classmethod trytond.cache.sync(transaction)

Synchronize cache instances using transaction.

classmethod trytond.cache.commit(transaction)

Apply cache changes from transaction.

classmethod trytond.cache.rollback(transaction)

Remove cache changes from transaction.

static trytond.cache.drop(dbname)

Drops all the caches for database dbname

Note

By default Tryton uses a MemoryCache, but this behaviour can be overridden by setting a fully qualified name of an alternative class defined in the configuration class of the cache section.