statemachinetest.java

mina是以Java实现的一个开源的网络程序框架

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 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
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 *  specific language governing permissions and limitations
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 */
package org.apache.mina.statemachine;

import junit.framework.TestCase;

import org.apache.mina.statemachine.State;
import org.apache.mina.statemachine.StateControl;
import org.apache.mina.statemachine.StateMachine;
import org.apache.mina.statemachine.context.DefaultStateContext;
import org.apache.mina.statemachine.context.StateContext;
import org.apache.mina.statemachine.event.Event;
import org.apache.mina.statemachine.transition.AbstractTransition;

/**
 * Tests {@link StateMachine}.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 586090 $, $Date: 2007-10-18 21:12:08 +0200 (Thu, 18 Oct 2007) $
 */
public class StateMachineTest extends TestCase {

    public void testBreakAndContinue() throws Exception {
        State s1 = new State("s1");
        s1.addTransition(new BreakAndContinueTransition("foo"));
        s1.addTransition(new SuccessTransition("foo"));

        StateContext context = new DefaultStateContext();
        StateMachine sm = new StateMachine(new State[] { s1 }, "s1");
        sm.handle(new Event("foo", context));
        assertEquals(true, context.getAttribute("success"));
    }
    
    public void testBreakAndGotoNow() throws Exception {
        State s1 = new State("s1");
        State s2 = new State("s2");
        s1.addTransition(new BreakAndGotoNowTransition("foo", "s2"));
        s2.addTransition(new SuccessTransition("foo"));

        StateContext context = new DefaultStateContext();
        StateMachine sm = new StateMachine(new State[] { s1, s2 }, "s1");
        sm.handle(new Event("foo", context));
        assertEquals(true, context.getAttribute("success"));
    }
    
    public void testBreakAndGotoNext() throws Exception {
        State s1 = new State("s1");
        State s2 = new State("s2");
        s1.addTransition(new BreakAndGotoNextTransition("foo", "s2"));
        s2.addTransition(new SuccessTransition("foo"));

        StateContext context = new DefaultStateContext();
        StateMachine sm = new StateMachine(new State[] { s1, s2 }, "s1");
        sm.handle(new Event("foo", context));
        assertSame(s2, context.getCurrentState());
        sm.handle(new Event("foo", context));
        assertEquals(true, context.getAttribute("success"));
    }

    private static class SuccessTransition extends AbstractTransition {
        public SuccessTransition(Object eventId) {
            super(eventId);
        }

        public SuccessTransition(Object eventId, State nextState) {
            super(eventId, nextState);
        }

        @Override
        protected boolean doExecute(Event event) {
            event.getContext().setAttribute("success", true);
            return true;
        }
    }
    
    private static class BreakAndContinueTransition extends AbstractTransition {
        public BreakAndContinueTransition(Object eventId) {
            super(eventId);
        }

        public BreakAndContinueTransition(Object eventId, State nextState) {
            super(eventId, nextState);
        }

        @Override
        protected boolean doExecute(Event event) {
            StateControl.breakAndContinue();
            return true;
        }
    }
    
    private static class BreakAndGotoNowTransition extends AbstractTransition {
        private final String stateId;

        public BreakAndGotoNowTransition(Object eventId, String stateId) {
            super(eventId);
            this.stateId = stateId;
        }

        public BreakAndGotoNowTransition(Object eventId, State nextState, String stateId) {
            super(eventId, nextState);
            this.stateId = stateId;
        }

        @Override
        protected boolean doExecute(Event event) {
            StateControl.breakAndGotoNow(stateId);
            return true;
        }
    }

    private static class BreakAndGotoNextTransition extends AbstractTransition {
        private final String stateId;

        public BreakAndGotoNextTransition(Object eventId, String stateId) {
            super(eventId);
            this.stateId = stateId;
        }

        public BreakAndGotoNextTransition(Object eventId, State nextState, String stateId) {
            super(eventId, nextState);
            this.stateId = stateId;
        }

        @Override
        protected boolean doExecute(Event event) {
            StateControl.breakAndGotoNext(stateId);
            return true;
        }
    }
}