bytesBeforeWritable() — netty Function Reference

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/AbstractHttp2StreamChannel.java lines 421–429

    @Override
    public long bytesBeforeWritable() {
        // +1 because writability doesn't change until the threshold is crossed (not equal to).
        long bytes = totalPendingSize - config().getWriteBufferLowWaterMark() + 1;
        // If bytes is negative we know we are writable, but if bytes is non-negative we have to check writability.
        // Note that totalPendingSize and isWritable() use different volatile variables that are not synchronized
        // together. totalPendingSize will be updated before isWritable().
        return bytes <= 0 || isWritable() ? 0 : bytes;
    }