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• 4.1.0
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• Transition.java

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com.alibaba.cola.statemachine.Transition Maven / Gradle / Ivy

package com.alibaba.cola.statemachine;

import com.alibaba.cola.statemachine.impl.TransitionType;

/**
 * {@code Transition} is something what a state machine associates with a state
 * changes.
 *
 * @author Frank Zhang
 *
 * @param  the type of state
 * @param  the type of event
 * @param  the type of user defined context, which is used to hold application data
 *
 * @date 2020-02-07 2:20 PM
 */
public interface Transition{
    /**
     * Gets the source state of this transition.
     *
     * @return the source state
     */
    State getSource();

    void setSource(State state);

    E getEvent();

    void setEvent(E event);

    void setType(TransitionType type);
    /**
     * Gets the target state of this transition.
     *
     * @return the target state
     */
    State getTarget();

    void setTarget(State state);

    /**
     * Gets the guard of this transition.
     *
     * @return the guard
     */
    Condition getCondition();

    void setCondition(Condition condition);

    Action getAction();

    void setAction(Action action);

    /**
     * Do transition from source state to target state.
     *
     * @return the target state
     */

    State transit(C ctx);
    /**
     * Verify transition correctness
     */
    void verify();
}