4.8. Extended Example: Asynchronous Availability Checks

public class YourResourceComponent implements ResourceComponent {
 
    // your component needs this data member - it is your availability collector
    private AvailabilityCollectorRunnable availCollector;

public class YourResourceComponent implements ResourceComponent {
 
    // your component needs this data member - it is your availability collector
    private AvailabilityCollectorRunnable availCollector;

    public void start(ResourceContext context) {
        availCollector = resourceContext.createAvailabilityCollectorRunnable(new AvailabilityFacet() {
            public AvailabilityType getAvailability() {
                // Perform the actual check to see if the managed resource is up or not
                // This method is not on a timer and can return the availability in any amount of time
                // that it needs to take.
                return ...AvailabilityType...;
            }
        }, 60000L); // 1 minute - the minimum interval allowed
 
        // Now that you've created your availability collector, start it to assign it a thread in the pool.
        availCollector.start();
 
        // ... and the rest of your component's start method goes here ...
	}


    public void stop() {
        // Stop your availability collector to cancel the collector and kill its thread.
        availCollector.stop();
 
        // ... and the rest of your component's stop method goes here ...
    }

    public void start(ResourceContext context) {
        availCollector = resourceContext.createAvailabilityCollectorRunnable(new AvailabilityFacet() {
            public AvailabilityType getAvailability() {
                // Perform the actual check to see if the managed resource is up or not
                // This method is not on a timer and can return the availability in any amount of time
                // that it needs to take.
                return ...AvailabilityType...;
            }
        }, 60000L); // 1 minute - the minimum interval allowed
 
        // Now that you've created your availability collector, start it to assign it a thread in the pool.
        availCollector.start();
 
        // ... and the rest of your component's start method goes here ...
	}


    public void stop() {
        // Stop your availability collector to cancel the collector and kill its thread.
        availCollector.stop();
 
        // ... and the rest of your component's stop method goes here ...
    }

    public AvailabilityType getAvailability() {
	// This method quickly returns the last known availability that was recorded 
	// by the availability collector.
        return availCollector.getLastKnownAvailability();
    }
}

    public AvailabilityType getAvailability() {
	// This method quickly returns the last known availability that was recorded 
	// by the availability collector.
        return availCollector.getLastKnownAvailability();
    }
}