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There is a newer version: 2.3.0

package com.artemis.systems;

import com.artemis.Aspect;
import com.artemis.BaseEntitySystem;

/** Entity system processed at a certain interval, without iteration implementation. */
public abstract class IntervalSystem extends BaseEntitySystem {
	/** Accumulated delta to keep track of interval. */
	protected float acc;
	/** How long to wait between updates. */
	private final float interval;

	private float intervalDelta;

	/**
	 * Creates a new IntervalEntitySystem.
	 * @param aspect
	 *			the aspect to match entities
	 * @param interval
	 *			the interval at which the system processes
	 */
	public IntervalSystem(Aspect.Builder aspect, float interval) {
		super(aspect);
		this.interval = interval;
	}


	@Override
	protected boolean checkProcessing() {
		acc += getTimeDelta();
		if(acc >= interval) {
			acc -= interval;
			intervalDelta = (acc - intervalDelta);

			return true;
		}
		return false;
	}

	/**
	 * Gets the actual delta since this system was last processed.
	 *
	 * @return Time passed since last process round.
	 */
	protected float getIntervalDelta() {
		return interval + intervalDelta;
	}

	protected float getTimeDelta() {
		return world.getDelta();
	}

}