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.



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# File 'lib/protocol/http2/window_update_frame.rb', line 12

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.



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# File 'lib/protocol/http2/window_update_frame.rb', line 47

def available
  @available
end

#capacity ⇒ Object

Returns the value of attribute capacity.



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# File 'lib/protocol/http2/window_update_frame.rb', line 27

def capacity
  @capacity
end

#used ⇒ Object (readonly)

Returns the value of attribute used.



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# File 'lib/protocol/http2/window_update_frame.rb', line 26

def used
  @used
end

Instance Method Details

#available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/protocol/http2/window_update_frame.rb', line 49

def available?
  @available > 0
end

#consume(amount) ⇒ Object 



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

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

#expand(amount) ⇒ Object 



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

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

#full? ⇒ Boolean

The window is completely full?

Returns:

  • (Boolean) 


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# File 'lib/protocol/http2/window_update_frame.rb', line 22

def full?
  @available <= 0
end

#inspect ⇒ Object 



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

def inspect
  "\#<#{self.class} used=#{@used} available=#{@available} capacity=#{@capacity}>"
end

#limited? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/protocol/http2/window_update_frame.rb', line 69

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

#wanted ⇒ Object 



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# File 'lib/protocol/http2/window_update_frame.rb', line 65

def wanted
  @used
end