Class: Protocol::HTTP2::Window

Inherits:
Object
  • Object
show all
Defined in:
lib/protocol/http2/window_update_frame.rb

Direct Known Subclasses

LocalWindow

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(capacity = 0xFFFF) ⇒ Window

Returns a new instance of Window.

Parameters:

  • capacity (Integer) (defaults to: 0xFFFF) —

    The initial window size, typically from the settings.



27
28
29
30
31
32
33
34
 
# File 'lib/protocol/http2/window_update_frame.rb', line 27

def initialize(capacity = 0xFFFF)
	# This is the main field required:
	@available = capacity
	
	# These two fields are primarily used for efficiently sending window updates:
	@used = 0
	@capacity = capacity
end

Instance Attribute Details

#available ⇒ Object (readonly)

Returns the value of attribute available.



56
57
58
 
# File 'lib/protocol/http2/window_update_frame.rb', line 56

def available
  @available
end

#capacity ⇒ Object

Returns the value of attribute capacity.



42
43
44
 
# File 'lib/protocol/http2/window_update_frame.rb', line 42

def capacity
  @capacity
end

#used ⇒ Object (readonly)

Returns the value of attribute used.



41
42
43
 
# File 'lib/protocol/http2/window_update_frame.rb', line 41

def used
  @used
end

Instance Method Details

#available? ⇒ Boolean

Returns:

  • (Boolean) 


58
59
60
 
# File 'lib/protocol/http2/window_update_frame.rb', line 58

def available?
	@available > 0
end

#consume(amount) ⇒ Object 



51
52
53
54
 
# File 'lib/protocol/http2/window_update_frame.rb', line 51

def consume(amount)
	@available -= amount
	@used += amount
end

#expand(amount) ⇒ Object 



62
63
64
65
66
67
68
69
70
 
# File 'lib/protocol/http2/window_update_frame.rb', line 62

def expand(amount)
	# puts "expand(#{amount}) @available=#{@available}"
	@available += amount
	@used -= amount
	
	if @available > MAXIMUM_ALLOWED_WINDOW_SIZE
		raise FlowControlError, "Expanding window by #{amount} caused overflow: #{@available} > #{MAXIMUM_ALLOWED_WINDOW_SIZE}!"
	end
end

#full? ⇒ Boolean

The window is completely full?

Returns:

  • (Boolean) 


37
38
39
 
# File 'lib/protocol/http2/window_update_frame.rb', line 37

def full?
	@available <= 0
end

#limited? ⇒ Boolean

Returns:

  • (Boolean) 


76
77
78
 
# File 'lib/protocol/http2/window_update_frame.rb', line 76

def limited?
	@available < (@capacity / 2)
end

#to_s ⇒ Object 



80
81
82
 
# File 'lib/protocol/http2/window_update_frame.rb', line 80

def to_s
	"\#<Window used=#{@used} available=#{@available} capacity=#{@capacity}>"
end

#wanted ⇒ Object 



72
73
74
 
# File 'lib/protocol/http2/window_update_frame.rb', line 72

def wanted
	@used
end