Method flip

java/org/apache/tomcat/util/buf/ByteBufferHolder.java:67–74

Flips the buffer if not already flipped. @return true if the buffer was flipped by this call

()

     * @return true if the buffer was flipped by this call
     */
    public boolean flip() {
        if (flipped.compareAndSet(false, true)) {
            buf.flip();
            return true;
        } else {
            return false;
        }
    }
}