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00031 import traceback
00032
00033 from python_qt_binding.QtCore import qCritical
00034
00035 from .plugin_provider import PluginProvider
00036
00037
00038 class CompositePluginProvider(PluginProvider):
00039
00040 """Composite of multiple `PluginProvider`s."""
00041
00042 def __init__(self, plugin_providers=None):
00043 super(CompositePluginProvider, self).__init__()
00044 self.setObjectName('CompositePluginProvider')
00045
00046 self._plugin_providers = plugin_providers or []
00047 self._discovered_plugins = {}
00048 self._running_plugins = {}
00049
00050 def set_plugin_providers(self, plugin_providers):
00051 self._plugin_providers = plugin_providers
00052
00053 def discover(self, discovery_data):
00054
00055 discovered_plugins = []
00056 for plugin_provider in self._plugin_providers:
00057 try:
00058 plugin_descriptors = plugin_provider.discover(discovery_data)
00059 except Exception:
00060 qCritical('CompositePluginProvider.discover() could not discover plugins from provider "%s":\n%s' % (type(plugin_provider), traceback.format_exc()))
00061 else:
00062 self._discovered_plugins[plugin_provider] = plugin_descriptors
00063 discovered_plugins += plugin_descriptors
00064 return discovered_plugins
00065
00066 def load(self, plugin_id, plugin_context):
00067
00068 for plugin_provider, plugin_descriptors in self._discovered_plugins.items():
00069 for plugin_descriptor in plugin_descriptors:
00070 if plugin_descriptor.plugin_id() == plugin_id:
00071 instance = plugin_provider.load(plugin_id, plugin_context)
00072 self._running_plugins[instance] = plugin_provider
00073 return instance
00074 raise UserWarning('plugin_id "%s" not found' % plugin_id)
00075
00076 def unload(self, plugin_instance):
00077
00078 if plugin_instance in self._running_plugins:
00079 self._running_plugins[plugin_instance].unload(plugin_instance)
00080 self._running_plugins.pop(plugin_instance)
00081 return
00082 raise UserWarning('plugin_instance not found')
00083
00084 def shutdown(self):
00085 for plugin_provider in self._plugin_providers:
00086 plugin_provider.shutdown()