2.1 KiB
Extension Manager
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.. module:: scrapy.extension :synopsis: The extension manager
The Extension Manager is responsible for loading and keeping track of installed extensions and it's configured through the :setting:`EXTENSIONS` setting which contains a list of all available extensions.
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Unknown interpreted text role "setting".The extension manager is a singleton-type class, which is instantiated at module load time and can be accessed like this:
from scrapy.extension import extensions webconsole_extension = extensions.enabled['WebConsole']
Attributes
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.. attribute:: ExtensionManager.loaded
A boolean which is True if extensions are already loaded or False if
they're not.
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.. attribute:: ExtensionManager.enabled
A dict with the enabled extensions. The keys are the extension class names,
and the values are the extension objects. Example::
>>> from scrapy.extension import extensions
>>> extensions.load()
>>> print extensions.enabled
{'CoreStats': <scrapy.stats.corestats.CoreStats object at 0x9e272ac>,
'WebConsoke': <scrapy.management.telnet.TelnetConsole instance at 0xa05670c>,
...
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.. attribute:: ExtensionManager.disabled
A dict with the disabled extensions. The keys are the extension class names,
and the values are the extension class paths (because objects are never
instantiated for disabled extensions). Example::
>>> from scrapy.extension import extensions
>>> extensions.load()
>>> print extensions.disabled
{'MemoryDebugger': 'scrapy.contrib.webconsole.stats.MemoryDebugger',
'SpiderProfiler': 'scrapy.contrib.spider.profiler.SpiderProfiler',
...
Methods
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.. method:: ExtensionManager.load()
Load the available extensions configured in the :setting:`EXTENSIONS`
setting. On a standard run, this method is usually called by the Execution
Manager, but you may need to call it explicitly if you're dealing with
code outside Scrapy.
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.. method:: ExtensionManager.reload()
Reload the available extensions. See ``load()``.