MonitoredConstant.java

package io.pcp.parfait;

import static tec.uom.se.AbstractUnit.ONE;
import javax.measure.Unit;

/**
 * MonitoredConstant provides an implementation of {@link Monitorable} for
 * simple values that are rarely (read: never) updated, once initialised.
 * <p>
 * This class should be used as for values which rarely change, such as the
 * number of installed CPUs or the application version number.
 * <p>
 * A setter exists for those cases where the value is not known until after
 * creation (pre-registration of the Monitorable is required, but the value is
 * not known at creation time), but this should not be called as a matter of
 * course.
 */
public class MonitoredConstant<T> extends SettableValue<T> {
    public MonitoredConstant(String name, String description, T initialValue) {
        this(name, description, MonitorableRegistry.DEFAULT_REGISTRY,
                initialValue);
    }

    public MonitoredConstant(String name, String description, T initialValue, Unit<?> unit) {
        this(name, description, MonitorableRegistry.DEFAULT_REGISTRY, initialValue, unit);
    }

    public MonitoredConstant(String name, String description, MonitorableRegistry registry,
            T initialValue) {
        this(name, description, registry, initialValue, ONE);
    }

    public MonitoredConstant(String name, String description, MonitorableRegistry registry,
            T initialValue, Unit<?> unit) {
        super(name, description, registry, initialValue, unit, ValueSemantics.CONSTANT);
    }
}