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Abstract class for plugins
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Virtual method for running the plugin
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Execution wrapper for the plugin
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Return agent cached value for this specific plugin.
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Set agent cache value previously passed to this plugin instance.
To enable caching existing agent_cache list have to be passed
to Plugin on initialization.
Minimally it should be list().
Agent will be able to see only changes in zero element of agent_cache, so
do not manually override self.agent_cache, othervice cache will not be saved!
If self.agent_cache is not a list appropriate exception will be raised.
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