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from plugin.core.database import Database |
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from stash import Stash, ApswArchive |
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from threading import Lock, Thread |
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import logging |
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import time |
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DEFAULT_SERIALIZER = 'msgpack:///' |
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log = logging.getLogger(__name__) |
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class CacheManager(object): |
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active = {} |
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_lock = Lock() |
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_process_interval = 10 |
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_process_running = True |
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_process_thread = None |
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@classmethod |
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def get(cls, key, serializer=DEFAULT_SERIALIZER): |
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with cls._lock: |
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if key in cls.active: |
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return cls.active[key] |
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return cls.open( |
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key, |
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serializer=serializer, |
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block=False |
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) |
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@classmethod |
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def open(cls, key, serializer=DEFAULT_SERIALIZER, block=True): |
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if block: |
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# Open cache in lock |
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with cls._lock: |
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return cls.open( |
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key, |
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serializer=serializer, |
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block=False |
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) |
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# Construct cache |
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cls.active[key] = Cache( |
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key, |
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serializer=serializer |
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) |
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# Ensure process thread has started |
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cls._start() |
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# Return cache |
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log.debug('Opened "%s" cache (serializer: %r)', key, serializer) |
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return cls.active[key] |
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@classmethod |
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def _start(cls): |
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if cls._process_thread is not None: |
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return |
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cls._process_thread = Thread(name='CacheManager._process', target=cls._process) |
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cls._process_thread.daemon = True |
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cls._process_thread.start() |
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@classmethod |
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def _process(cls): |
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try: |
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cls._process_run() |
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except Exception, ex: |
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log.error('Exception raised in CacheManager: %s', ex, exc_info=True) |
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@classmethod |
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def _process_run(cls): |
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while cls._process_running: |
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# Retrieve current time |
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now = time.time() |
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# Retrieve active caches |
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with cls._lock: |
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caches = cls.active.values() |
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# Sync caches that have been queued |
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for cache in caches: |
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if cache.flush_at is None or cache.flush_at > now: |
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continue |
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cache.flush() |
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time.sleep(cls._process_interval) |
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class Cache(object): |
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def __init__(self, key, serializer=DEFAULT_SERIALIZER): |
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self.key = key |
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self.stash = self._construct(key, serializer=serializer) |
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self._flush_at = None |
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self._flush_lock = Lock() |
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104
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@property |
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def flush_at(self): |
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return self._flush_at |
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108
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@staticmethod |
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def _construct(key, serializer=DEFAULT_SERIALIZER): |
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# Parse `key` |
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fragments = key.split('.') |
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112
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113
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if len(fragments) != 2: |
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raise ValueError('Invalid "key" format') |
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116
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database, table = tuple(fragments) |
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118
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# Construct cache |
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return Stash( |
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ApswArchive(Database.cache(database), table), |
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'lru:///?capacity=500&compact_threshold=1500', |
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serializer=serializer, |
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key_transform=(lambda k: str(k), lambda k: k) |
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) |
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126
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def get(self, key, default=None): |
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return self.stash.get(key, default) |
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129
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def prime(self, keys=None, force=False): |
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return self.stash.prime(keys, force) |
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132
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def __getitem__(self, key): |
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return self.stash[key] |
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135
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def __setitem__(self, key, value): |
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self.stash[key] = value |
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137
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138
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def flush(self, force=False): |
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with self._flush_lock: |
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self._flush(force=force) |
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142
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def _flush(self, force=False): |
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if not force and self._flush_at is None: |
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return |
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145
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146
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try: |
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self.stash.flush() |
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148
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149
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log.debug('Flushed "%s" cache', self.key) |
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except Exception, ex: |
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log.error('Unable to flush "%s" cache: %s', self.key, ex, exc_info=True) |
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finally: |
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self.flush_clear() |
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155
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def flush_queue(self, delay=120): |
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log.debug('Queued flush for "%s" cache in %ss', self.key, delay) |
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157
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158
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self._flush_at = time.time() + 120 |
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160
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def flush_clear(self): |
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if self._flush_at is None: |
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return |
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163
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164
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log.debug('Cleared flush for "%s" cache', self.key) |
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166
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self._flush_at = None |
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167
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fuzeman /
Plex-Trakt-Scrobbler
