blob: 5a7701e91e070c02b33280e5213ef54268e2b2e4 [file] [log] [blame]
#include <stddef.h>
#include <functional>
#include "common/platform/api/quiche_export.h"
namespace http2 {
namespace adapter {
namespace test {
class WindowManagerPeer;
// This class keeps track of a HTTP/2 flow control window, notifying a listener
// when a window update needs to be sent. This class is not thread-safe.
class QUICHE_EXPORT_PRIVATE WindowManager {
// A WindowUpdateListener is invoked when it is time to send a window update.
typedef std::function<void(size_t)> WindowUpdateListener;
WindowManager(size_t window_size_limit,
WindowUpdateListener listener);
size_t CurrentWindowSize() const { return window_; }
size_t WindowSizeLimit() const { return limit_; }
// Called when the window size limit is changed (typically via settings) but
// no window update should be sent.
void OnWindowSizeLimitChange(size_t new_limit);
// Sets the window size limit to |new_limit| and notifies the listener to
// update as necessary.
void SetWindowSizeLimit(size_t new_limit);
// Increments the running total of data bytes buffered. Returns true iff there
// is more window remaining.
bool MarkDataBuffered(size_t bytes);
// Increments the running total of data bytes that have been flushed or
// dropped. Invokes the listener if the current window is smaller than some
// threshold and there is quota available to send.
void MarkDataFlushed(size_t bytes);
// Convenience method, used when incoming data is immediately dropped or
// ignored.
void MarkWindowConsumed(size_t bytes) {
friend class test::WindowManagerPeer;
void MaybeNotifyListener();
// The upper bound on the flow control window. The GFE attempts to maintain a
// window of this size at the peer as data is proxied through.
size_t limit_;
// The current flow control window that has not been advertised to the peer
// and not yet consumed. The peer can send this many bytes before becoming
// blocked.
size_t window_;
// The amount of data already buffered, which should count against the flow
// control window upper bound.
size_t buffered_;
WindowUpdateListener listener_;
} // namespace adapter
} // namespace http2