Package concurrent_tree_crawler :: Module rw_lock_tree_accessor :: Class RWLockTreeAccessor

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Class RWLockTreeAccessor

A version of the TreeAccessor where sensitive methods are protected by readers-writers lock.

Instance Methods

__init__(self, sentinel)

source code

get_lock(self)

source code

(AbstractNode, NodeAction) pair or None

update_and_get_child(self, node, possible_children_names)
Append new children to the node and return a child that can be entered by the crawler.

source code

__update_with_potential_tree_change(self, node, possible_children_names)

source code

set_node_type(self, node, is_leaf)
Set the leaf state of the node

source code

set_error(self, node)
Set the node state as NodeState.ERROR source code

Inherited from tree_accessor.TreeAccessor: get_root, get_sentinel

Inherited from abstract_tree_accessor.AbstractTreeAccessor: get_path

Method Details

init(self, sentinel)
(Constructor)

Parameters:

sentinel - a technical node which will be made parent of the root node.

Overrides: tree_accessor.TreeAccessor.__init__

(inherited documentation)

update_and_get_child(self, node, possible_children_names)

Append new children to the node and return a child that can be entered by the crawler.

Parameters:

node - node considered
possible_children_names - list of children names

Returns: (AbstractNode, NodeAction) pair or None

children node along with information what the crawler should do with it. None instead is returned if all children have state NodeState.CLOSED or NodeState.ERROR or the node has no children.

Overrides: abstract_tree_accessor.AbstractTreeAccessor.update_and_get_child

(inherited documentation)

set_node_type(self, node, is_leaf)

Set the leaf state of the node

Parameters:

is_leaf - True iff the node is a leaf

Overrides: abstract_tree_accessor.AbstractTreeAccessor.set_node_type

(inherited documentation)

set_error(self, node)

Set the node state as NodeState.ERROR

Overrides: abstract_tree_accessor.AbstractTreeAccessor.set_error: (inherited documentation)