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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.agent;

/**
 * Artificial Intelligence A Modern Approach (3rd Edition): Figure 2.1, page 35.

 * 
 * Figure 2.1 Agents interact with environments through sensors and actuators.
 * 
 * @author Ravi Mohan
 * @author Ciaran O'Reilly
 */
public interface Agent extends EnvironmentObject {
	/**
	 * Call the Agent's program, which maps any given percept sequences to an
	 * action.
	 * 
	 * @param percept
	 *            The current percept of a sequence perceived by the Agent.
	 * @return the Action to be taken in response to the currently perceived
	 *         percept.
	 */
	Action execute(Percept percept);

	/**
	 * Life-cycle indicator as to the liveness of an Agent.
	 * 
	 * @return true if the Agent is to be considered alive, false otherwise.
	 */
	boolean isAlive();

	/**
	 * Set the current liveness of the Agent.
	 * 
	 * @param alive
	 *            set to true if the Agent is to be considered alive, false
	 *            otherwise.
	 */
	void setAlive(boolean alive);
}