Class: Concurrent::Edge::LockFreeLinkedSet::Node

Inherits:
Synchronization::Object show all
Includes:
Comparable
Defined in:
lib-edge/concurrent/edge/lock_free_linked_set/node.rb

Direct Known Subclasses

Head, Tail

Instance Method Summary collapse

Constructor Details

#initialize(data = nil, successor = nil) ⇒ Node

Returns a new instance of Node



11
12
13
14
15
16
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 11

def initialize(data = nil, successor = nil)
  super()
  @SuccessorReference  = AtomicMarkableReference.new(successor || Tail.new)
  @Data                = data
  @Key                 = key_for data
end

Instance Method Details

#<=>(other) ⇒ undocumented

We use Object#hash as a way to enforce ordering on the nodes. This can be configurable in the future; for example, you could enforce a split-ordering on the nodes in the set.



51
52
53
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 51

def <=>(other)
  @Key <=> other.hash
end

#data ⇒ undocumented 



18
19
20
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 18

def data
  @Data
end

#key ⇒ undocumented 



26
27
28
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 26

def key
  @Key
end

#key_for(data) ⇒ undocumented

This method provides a unqiue key for the data which will be used for ordering. This is configurable, and changes depending on how you wish the nodes to be ordered.



44
45
46
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 44

def key_for(data)
  data.hash
end

#last? ⇒ Boolean

Check to see if the node is the last in the list.

Returns:

  • (Boolean) 


31
32
33
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 31

def last?
  @SuccessorReference.value.is_a? Tail
end

#next_node ⇒ undocumented

Next node in the list. Note: this is not the AtomicMarkableReference of the next node, this is the actual Node itself.



37
38
39
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 37

def next_node
  @SuccessorReference.value
end

#successor_reference ⇒ undocumented 



22
23
24
 
# File 'lib-edge/concurrent/edge/lock_free_linked_set/node.rb', line 22

def successor_reference
  @SuccessorReference
end