package jmri.util;

import jmri.managers.DefaultShutDownManager;

/**
 * Mock ShutDownManager for unit testing.
 * <p>
 * To clear the state of shutting down, call
 * {@link #resetShuttingDown()}.
 * <p>
 * This overrides the DefaultShutDownManager with two changes to that manager's behavior:
 * <ul>
 * <li>This does not register a shutdown hook with the Runtime to catch SIGTERM, Ctrl-C, and the like.</li>
 * <li>This does not call System.exit() when {@link #shutdown()} or {@link #restart()} are called.</li>
 * </ul>
 *
 * @author Randall Wood Copyright 2019
 */
public class MockShutDownManager extends DefaultShutDownManager {

    public MockShutDownManager() {
        super();
        Runtime.getRuntime().removeShutdownHook(shutdownHook);
    }

    /**
     * {@inheritDoc}
     *
     * This implementation runs all shutdown tasks, but does not actually call
     * System.exit().
     */
    @Override
    public void restart() {
        shutdown(100, false);
    }

    /**
     * {@inheritDoc}
     *
     * This implementation runs all shutdown tasks, but does not actually call
     * System.exit().
     */
    @Override
    public void shutdown() {
        shutdown(0, false);
    }

    public void resetShuttingDown() {
        setShuttingDown(false);
    }
}