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