trunk/proposal/sandbox/junit/src/main/org/apache/tools/ant/taskdefs/optional/rjunit/remote/EventDispatcher.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.tools.ant.taskdefs.optional.rjunit.remote;

import java.util.ArrayList;
import java.util.HashMap;

/**
 * Dispatch messages to appropriate listener methode based on event id.
 *
 */
public class EventDispatcher {

    private final static HashMap eventMap = new HashMap(3);

    static {
        registerDefaults();
    }

    /** the set of registered listeners */
    private ArrayList listeners = new ArrayList();

    /**
     * Add a new listener.
     * @param listener a listener that will receive events from the client.
     */
    public void addListener(TestRunListener listener) {
        listeners.add(listener);
    }

    public void removeListener(TestRunListener listener) {
        listeners.remove(listener);
    }

    /**
     * Process a message from the client and dispatch the
     * appropriate message to the listeners.
     */
    public void dispatchEvent(TestRunEvent evt) {
        final Integer type = new Integer(evt.getType());
        final EventAction action = (EventAction) eventMap.get(type);
        if (action == null) {
            return;
        }
        synchronized (listeners) {
            final int count = listeners.size();
            for (int i = 0; i < count; i++) {
                TestRunListener listener = (TestRunListener) listeners.get(i);
                action.dispatch(listener, evt);
            }
        }
    }

    private static void registerDefaults() {
        registerAction(TestRunEvent.RUN_STARTED, new RunStartedAction());
        registerAction(TestRunEvent.RUN_ENDED, new RunEndedAction());
        registerAction(TestRunEvent.TEST_STARTED, new TestStartedAction());
        registerAction(TestRunEvent.TEST_ENDED, new TestEndedAction());
        registerAction(TestRunEvent.TEST_FAILURE, new TestFailureAction());
        registerAction(TestRunEvent.TEST_ERROR, new TestErrorAction());
        registerAction(TestRunEvent.SUITE_STARTED, new SuiteStartedAction());
        registerAction(TestRunEvent.SUITE_ENDED, new SuiteEndedAction());
        registerAction(TestRunEvent.RUN_STOPPED, new RunStoppedAction());
    }

    private static void registerAction(int id, EventAction action){
        eventMap.put(new Integer(id), action);
    }

    public interface EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt);
    }

    private static class RunStartedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onRunStarted(evt);
        }
    }

    private static class RunEndedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onRunEnded(evt);
        }
    }

    private static class TestStartedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onTestStarted(evt);
        }
    }

    private static class TestEndedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onTestEnded(evt);
        }
    }

    private static class TestFailureAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onTestFailure(evt);
        }
    }

    private static class TestErrorAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onTestError(evt);
        }
    }

    private static class SuiteStartedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onSuiteStarted(evt);
        }
    }

    private static class SuiteEndedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onSuiteEnded(evt);
        }
    }

    private static class RunStoppedAction implements EventAction {
        public void dispatch(TestRunListener listener, TestRunEvent evt) {
            listener.onRunStopped(evt);
        }
    }

}