refactor plan...

RefactorPlan

@@ -62,3 +62,11 @@ out exact error is try to parse error string (which is localized).
 ==> database
 * brr...
 
+
+==> class attributes
+* In some classes there are some attributes assigned but never
+used. (see remove_unused_attributes.patch)
+
+* PiSi uses heavy classes and creates thousands of instances of them
+  (Package, Metadata, Dependency, ...). These classes should define
+  __slots__ to reduce the heap used.

remove_unused_attributes.patch

@@ -0,0 +1,76 @@
+Index: pisi/atomicoperations.py
+===================================================================
+--- pisi/atomicoperations.py	(revision 11473)
++++ pisi/atomicoperations.py	(working copy)
+@@ -42,12 +42,8 @@
+ 
+ class AtomicOperation(object):
+ 
+-    def __init__(self, ignore_dep = None):
+-        #self.package = package
+-        if ignore_dep==None:
+-            self.ignore_dep = ctx.config.get_option('ignore_dependency')
+-        else:
+-            self.ignore_dep = ignore_dep
++    def __init__(self):
++        pass
+ 
+     def run(self, package):
+         "perform an atomic package operation"
+@@ -58,7 +54,7 @@
+     "Install class, provides install routines for pisi packages"
+ 
+     @staticmethod
+-    def from_name(name, ignore_dep = None):
++    def from_name(name):
+         # download package and return an installer object
+         # find package in repository
+         repo = ctx.packagedb.which_repo(name)
+@@ -77,13 +73,13 @@
+ 
+             ctx.ui.info(_("Package URI: %s") % pkg_path, verbose=True)
+ 
+-            return Install(pkg_path, ignore_dep)
++            return Install(pkg_path)
+         else:
+             raise Error(_("Package %s not found in any active repository.") % name)
+ 
+-    def __init__(self, package_fname, ignore_dep = None, ignore_file_conflicts = None):
++    def __init__(self, package_fname, ignore_file_conflicts = None):
+         "initialize from a file name"
+-        super(Install, self).__init__(ignore_dep)
++        super(Install, self).__init__()
+         if not ignore_file_conflicts:
+             ignore_file_conflicts = ctx.get_option('ignore_file_conflicts')
+         self.ignore_file_conflicts = ignore_file_conflicts
+@@ -394,8 +390,8 @@
+ 
+ class Remove(AtomicOperation):
+ 
+-    def __init__(self, package_name, ignore_dep = None):
+-        super(Remove, self).__init__(ignore_dep)
++    def __init__(self, package_name):
++        super(Remove, self).__init__()
+         self.package_name = package_name
+         self.package = ctx.packagedb.get_package(self.package_name, pisi.itembyrepodb.installed)
+         try:
+Index: pisi/archive.py
+===================================================================
+--- pisi/archive.py	(revision 11473)
++++ pisi/archive.py	(working copy)
+@@ -42,12 +42,11 @@
+         self.type = atype
+ 
+     def unpack(self, target_dir, clean_dir = False):
+-        self.target_dir = target_dir
+         # first we check if we need to clean-up our working env.
+-        if os.path.exists(self.target_dir) and clean_dir:
+-            util.clean_dir(self.target_dir)
++        if os.path.exists(target_dir) and clean_dir:
++            util.clean_dir(target_dir)
+ 
+-        os.makedirs(self.target_dir)
++        os.makedirs(target_dir)
+ 
+ 
+ class ArchiveBinary(ArchiveBase):