wic: plugin: cache results in get_plugins

Store results of PluginMgr.get_plugins to avoid
loading plugins more than once.

This should speed up finding plugins.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>

diff --git a/scripts/lib/wic/plugin.py b/scripts/lib/wic/plugin.py
index 36a120bb1ca571ea9a45a1c3e3ebd4d739cac071..094a878e0fd92e8a194d49847fed002dc74f17f3 100644 (file)
--- a/scripts/lib/wic/plugin.py
+++ b/scripts/lib/wic/plugin.py
@@ -31,7 +31,7 @@ logger = logging.getLogger('wic')
 
 class PluginMgr:
     _plugin_dirs = []
-    _loaded = []
+    _plugins = {}
 
     @classmethod
     def get_plugins(cls, ptype):
@@ -39,6 +39,9 @@ class PluginMgr:
         if ptype not in PLUGIN_TYPES:
             raise WicError('%s is not valid plugin type' % ptype)
 
+        if ptype in cls._plugins:
+            return cls._plugins[ptype]
+
         # collect plugin directories
         if not cls._plugin_dirs:
             cls._plugin_dirs = [os.path.join(os.path.dirname(__file__), 'plugins')]
@@ -52,13 +55,12 @@ class PluginMgr:
         # load plugins
         for pdir in cls._plugin_dirs:
             ppath = os.path.join(pdir, ptype)
-            if ppath not in cls._loaded:
-                if os.path.isdir(ppath):
-                    for fname in os.listdir(ppath):
-                        if fname.endswith('.py'):
-                            mname = fname[:-3]
-                            mpath = os.path.join(ppath, fname)
-                            SourceFileLoader(mname, mpath).load_module()
-                cls._loaded.append(ppath)
+            if os.path.isdir(ppath):
+                for fname in os.listdir(ppath):
+                    if fname.endswith('.py'):
+                        mname = fname[:-3]
+                        mpath = os.path.join(ppath, fname)
+                        SourceFileLoader(mname, mpath).load_module()
 
-        return pluginbase.get_plugins(ptype)
+        cls._plugins[ptype] = pluginbase.get_plugins(ptype)
+        return cls._plugins[ptype]