12.5. Repository Monitor

public interface RepositoryMonitor {

    /**
     * Get the ValueMetric enumerations that are available for use by the caller
     * with {{getHistory(ValueMetric, Window)}}.
     *
     * @return the immutable set of ValueMetric instances; never null but possibly
     *         empty if the caller has no permissions to see any value metrics
     */
    Set<ValueMetric> getAvailableValueMetrics();

    /**
     * Get the DurationMetric enumerations that are available for use by the caller
     * with {{getHistory(DurationMetric, Window)}}.
     *
     * @return the immutable set of DurationMetric instances; never null but possibly
     *         empty if the caller has no permissions to see any value metrics
     */
    Set<DurationMetric> getAvailableDurationMetrics();

    /**
     * Get the Window enumerations that are available for use by the caller with
     * {{getHistory(DurationMetric, Window)}} and {{getHistory(ValueMetric, Window)}}.
     *
     * @return the immutable set of DurationMetric instances; never null but possibly
     *         empty if the caller has no permissions to see any value metrics
     */
    Set<Window> getAvailableWindows();

    /**
     * Get the statics for the specified value metric during the given window in time.
     * The oldest statistics will be first, while the newest statistics will be last.
     *
     * @param metric the value metric; may not be null
     * @param windowInTime the window specifying which statistics are to be returned;
     *        may not be null
     * @return the history of the metrics; never null but possibly empty if there are
     *         no statistics being captures for this repository
     * @throws AccessDeniedException if the session does not have privileges to monitor the repository
     * @throws RepositoryException if there is an error obtaining the history
     */
    public History getHistory( ValueMetric metric,
                               Window windowInTime )
                   throws AccessDeniedException, RepositoryException;

    /**
     * Get the statics for the specified duration metric during the given window in time.
     * The oldest statistics will be first, while the newest statistics will be last.
     *
     * @param metric the duration metric; may not be null
     * @param windowInTime the window specifying which statistics are to be returned;
     *        may not be null
     * @return the history of the metrics; never null but possibly empty if there are
     *         no statistics being captures for this repository
     * @throws AccessDeniedException if the session does not have privileges to monitor the repository
     * @throws RepositoryException if there is an error obtaining the history
     */
    public History getHistory( DurationMetric metric,
                               Window windowInTime )
                   throws AccessDeniedException, RepositoryException;

    /**
     * Get the longest-running activities recorded for the specified metric.
     * The results contain the duration records in order of increasing duration,
     * with the activity with the longest duration appearing last in the array.
     *
     * @param metric the duration metric; may not be null
     * @return the activities with the longest durations; never null but possibly
     *         empty if no such activities were performed
     * @throws AccessDeniedException if the session does not have privileges to monitor the repository
     * @throws RepositoryException if there is an error obtaining the history
     */
    public DurationActivity[] getLongestRunning( DurationMetric metric )
                   throws AccessDeniedException, RepositoryException;

Session session = ...
org.modeshape.jcr.api.Workspace workspace = (org.modeshape.jcr.api.Workspace)session.getWorkspace();
RepositoryMonitor monitor = workspace.getRepositoryManager().getRepositoryMonitor();