/**
* Process all non-passive systems.
*
* @see InvocationStrategy to control and extend how systems are invoked.
*/
public void process() {
updateEntityStates();
invocationStrategy.process(systemsBag);
}
/** Set strategy for invoking systems on {@link #process()}. */
protected void setInvocationStrategy(SystemInvocationStrategy invocationStrategy) {
this.invocationStrategy = invocationStrategy;
invocationStrategy.setWorld(this);
invocationStrategy.initialize();
}