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"""Cache abstractions."""

from .entry import CacheEntry

from .memory_store import MemoryStore

from .stats import CacheStats

class Cache(object):

"""A unified interface to different implementations of data caching.

Example of an implementetion is

:class:`stormpath.cache.memory_store.MemoryStore`.

It also provides usage statistics with

:class:`stormpath.cache.stats.CacheStats`.

"""

DEFAULT_STORE = MemoryStore

DEFAULT_TTL = 5 * 60 # seconds

DEFAULT_TTI = 5 * 60 # seconds

def __init__(self, store=DEFAULT_STORE, ttl=DEFAULT_TTL, tti=DEFAULT_TTI,

**kwargs):

self.ttl = ttl

self.tti = tti

store_opts = kwargs.get('store_opts', {})

# pass along max entries only to memory store instances

if store != MemoryStore:

store_opts.pop('max_entries', None)

self.store = store(**store_opts)

self.stats = CacheStats()

def get(self, key):

entry = self.store[key]

if entry:

if entry.is_expired(self.ttl, self.tti):

self.stats.miss(expired=True)

del self.store[key]

return None

else:

self.stats.hit()

entry.touch()

return entry.value

else:

self.stats.miss()

return None

def put(self, key, value, new=True):

self.store[key] = CacheEntry(value)

self.stats.put(new=new)

def delete(self, key):

del self.store[key]

self.stats.delete()

def clear(self):

self.store.clear()

self.stats.clear()

@property

def size(self):

return len(self.store)

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