@Override
        public void onClose() {
            for (final Runnable action : onClose) {
                action.run();
            }
        }
Configuration parameter that controls if a request for a new connection
should be queued until one becomes available or if it should cause an
exception to be thrown if no connection is available.
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/component/connectionpool/SingletonConnectionPoolComponent.java