700ac93b15
Currently the DefaultHttp2InboundFlowController only supports the ability to turn on and off "window maintenance" for a stream. This is insufficient for true application-level flow control that may only want to return a few bytes to flow control at a time. Modifications: Removing "window maintenance" interface from DefaultHttp2InboundFlowController in favor of the new interface. Created the Http2InboundFlowState interface which extends Http2FlowState to add the ability to return bytes for a specific stream. Changed the onDataRead method to return an integer number of bytes that will be immediately returned to flow control, to support use cases that want to opt-out of application-level inbound flow control. Updated DefaultHttp2InboundFlowController to use 2 windows per stream. The first, "window", is the actual flow control window that is decremented as soon as data is received. The second "processedWindow" is a delayed view of "window" that is only decremented after the application returns the processed bytes. It is processedWindow that is used when determining when to send a WINDOW_UPDATE to restore part of the inbound flow control window for the stream/connection. Result: The HTTP/2 inbound flow control interfaces support application-level flow control. |
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