elk-reasoner/src/main/java/org/semanticweb/elk/reasoner/stages/AbstractReasonerStage.java
@Override
	public boolean preExecute() {
		if (isInitialized_)
			return false;
		LOGGER_.trace("{}: initialized", this);
		this.workerNo = reasoner.getNumberOfWorkers();
		return isInitialized_ = true;
	}
@Override
	public boolean preExecute() {
		if (isInitialized_)
			return false;
		LOGGER_.trace("{}: initialized", this);
		this.workerNo = reasoner.getNumberOfWorkers();
		return isInitialized_ = true;
	}
Initialize the parameters of the computation for this stage; this is the
first thing to be done before stage is executed

@return {@code true} if the operation is successful