Monitoring. While synchronization methods may be invoked * only by registered parties, the current state of a phaser may be * monitored by any caller. At any given moment there are {@link - * #getRegisteredParties}, where {@link #getArrivedParties} have - * arrived at the current phase ({@link #getPhase}). When the - * remaining {@link #getUnarrivedParties}) arrive, the phase - * advances. Method {@link #toString} returns snapshots of these state - * queries in a form convenient for informal monitoring. + * #getRegisteredParties} parties in total, of which {@link + * #getArrivedParties} have arrived at the current phase ({@link + * #getPhase}). When the remaining ({@link #getUnarrivedParties}) + * parties arrive, the phase advances; thus, this value is always + * greater than zero if there are any registered parties. The values + * returned by these methods may reflect transient states and so are + * not in general useful for synchronization control. Method {@link + * #toString} returns snapshots of these state queries in a form + * convenient for informal monitoring. * *
Sample usages: *