Method reserveWindowSize

java/org/apache/coyote/http2/Stream.java:253–291

(int reservation, boolean block)

    final int reserveWindowSize(int reservation, boolean block) throws IOException {
        windowAllocationLock.lock();
        try {
            long windowSize = getWindowSize();
            while (windowSize < 1) {
                if (!canWrite()) {
                    throw new CloseNowException(sm.getString("stream.notWritable", getConnectionId(), getIdAsString()));
                }
                if (block) {
                    try {
                        long writeTimeout = handler.getProtocol().getStreamWriteTimeout();
                        allocationManager.waitForStream(writeTimeout);
                        windowSize = getWindowSize();
                        if (windowSize == 0) {
                            doStreamCancel(sm.getString("stream.writeTimeout"), Http2Error.ENHANCE_YOUR_CALM);
                        }
                    } catch (InterruptedException e) {
                        // Possible shutdown / rst or similar. Use an IOException to
                        // signal to the client that further I/O isn't possible for this
                        // Stream.
                        throw new IOException(e);
                    }
                } else {
                    allocationManager.waitForStreamNonBlocking();
                    return 0;
                }
            }
            int allocation;
            if (windowSize < reservation) {
                allocation = (int) windowSize;
            } else {
                allocation = reservation;
            }
            decrementWindowSize(allocation);
            return allocation;
        } finally {
            windowAllocationLock.unlock();
        }
    }


    void doStreamCancel(String msg, Http2Error error) throws CloseNowException {