001package jmri.jmrit.operations.setup.backup;
002
003import org.slf4j.Logger;
004import org.slf4j.LoggerFactory;
005
006import jmri.InstanceManager;
007import jmri.jmrit.operations.OperationsXml;
008import jmri.jmrit.operations.setup.Setup;
009import jmri.jmrit.operations.trains.TrainManager;
010
011/**
012 * Auto Save. When enabled will automatically save operation files.
013 *
014 * @author Daniel Boudreau Copyright (C) 2012
015 */
016public class AutoSave {
017
018    static Thread autoSave = null;
019
020    public static synchronized void start() {
021        if (Setup.isAutoSaveEnabled() && autoSave == null) {
022            autoSave = jmri.util.ThreadingUtil.newThread(() -> {
023                saveFiles();
024            });
025            autoSave.setName("Operations Auto Save"); // NOI18N
026            autoSave.start();
027        }
028    }
029
030    public static synchronized void stop() {
031        if (autoSave != null) {
032            autoSave.interrupt();
033            try {
034                autoSave.join();
035            } catch (InterruptedException e) {
036                // Do nothing
037            } catch (NullPointerException e) {
038                // Do nothing
039            }
040            autoSave = null;
041        }
042    }
043
044    @edu.umd.cs.findbugs.annotations.SuppressFBWarnings( value="SLF4J_FORMAT_SHOULD_BE_CONST",
045            justification="I18N of Info Message")
046    private static void saveFiles() {
047        while (true) {
048            synchronized (autoSave) {
049                if (!Setup.isAutoSaveEnabled()) {
050                    break;
051                }
052                try {
053                    autoSave.wait(60000); // check every minute
054                } catch (InterruptedException e) {
055                    break; // stop was called
056                }
057                if (OperationsXml.areFilesDirty()) {
058                    log.debug("Detected dirty operation files");
059                    try {
060                        autoSave.wait(60000); // wait another minute before
061                                              // saving
062                    } catch (InterruptedException e) {
063                        //do nothing
064                    }
065                    if (!Setup.isAutoSaveEnabled()) {
066                        break;
067                    }
068                    if (InstanceManager.getDefault(TrainManager.class).isAnyTrainBuilding()) {
069                        log.debug("Detected trains being built");
070                        continue;
071                    }
072                    if (OperationsXml.areFilesDirty()) {
073                        OperationsXml.save();
074                        log.info(Bundle.getMessage("InfoFilesSaved"));
075                    }
076                }
077            }
078        }
079        autoSave = null; // done
080    }
081
082    private final static Logger log = LoggerFactory.getLogger(AutoSave.class);
083}