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Merged variable_cache_size [r=jamesh,jkakar] [a=lightyear] [f=257267]

Store's constructor takes an optional cache_size keyword argument
representing the maximum number of objects to keep alive in the
cache at any time.  The default is 100, the same as it was before.

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storm/store.py
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PENDING_REMOVE = 2
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# The maximum number of objects the cache should have per default.
 
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DEFAULT_CACHE_SIZE = 100
 
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class Store(object):
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    """The Storm Store.
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    _result_set_factory = None
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    def __init__(self, database):
 
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    def __init__(self, database, cache_size=DEFAULT_CACHE_SIZE):
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        """
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        @param database: The L{storm.database.Database} instance to use.
 
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        @param cache_size: The maximum number of objects the internal cache
 
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            should keep alive.  Defaults to L{DEFAULT_CACHE_SIZE}.
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        """
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        self._connection = database.connect()
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        self._alive = WeakValueDictionary()
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        self._dirty = {}
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        self._order = {} # (info, info) = count
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        self._cache = Cache(100)
 
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        self._cache = Cache(cache_size)
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        self._implicit_flush_block_count = 0
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        self._sequence = 0 # Advisory ordering.
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        self._event = EventSystem(self)