Example usage for io.netty.channel ChannelPromise unvoid

Introduction

In this page you can find the example usage for io.netty.channel ChannelPromise unvoid.

Prototype

ChannelPromise unvoid();

Source Link

Document

Returns a new ChannelPromise if #isVoid() returns true otherwise itself.

Usage

From source file:io.grpc.netty.Http2ControlFrameLimitEncoder.java

License:Apache License

private ChannelPromise handleOutstandingControlFrames(ChannelHandlerContext ctx, ChannelPromise promise) {
    if (!limitReached) {
        if (outstandingControlFrames == maxOutstandingControlFrames) {
            // Let's try to flush once as we may be able to flush some of the control frames.
            ctx.flush();//from   w w  w.jav  a 2  s  . c om
        }
        if (outstandingControlFrames == maxOutstandingControlFrames) {
            limitReached = true;
            Http2Exception exception = Http2Exception.connectionError(Http2Error.ENHANCE_YOUR_CALM,
                    "Maximum number %d of outstanding control frames reached", maxOutstandingControlFrames);
            logger.info("Maximum number {} of outstanding control frames reached. Closing channel {}",
                    maxOutstandingControlFrames, ctx.channel(), exception);

            // First notify the Http2LifecycleManager and then close the connection.
            lifecycleManager.onError(ctx, true, exception);
            ctx.close();
        }
        outstandingControlFrames++;

        // We did not reach the limit yet, add the listener to decrement the number of outstanding control frames
        // once the promise was completed
        return promise.unvoid().addListener(outstandingControlFramesListener);
    }
    return promise;
}

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