Source Code Cross Referenced for HostAvailabilityMediator.java in  » Portal » Open-Portal » com » sun » portal » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Open Portal » com.sun.portal.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package com.sun.portal.util;
02:
03:        import java.util.Observable;
04:        import java.util.Observer;
05:
06:        /*
07:         * com.sun.portal.util.ServersList maintains a list of currently
08:         * available portal instances. com.sun.portal.rproxy.configservlet.HostAccess also
09:         * needs to know the list of available portal instance to prevent single point of
10:         * failure and load balance all user profile requests. 
11:         *
12:         * Just break the circular dependency between these two packages if ServerList is
13:         * directly used in SrapClient a Mediator pattern is being implemented.
14:         *
15:         * @ see com.sun.portal.util.HostAvailabilityEvent
16:         * @ see com.sun.portal.util.HostAvailabilityListener
17:         * @ see com.sun.portal.util.HostAvailabilityEventImpl 
18:         *
19:         * @author  Rajesh T
20:         * @version 1.0
21:         * @date 25-07-2002
22:         *
23:         */
24:
25:        public final class HostAvailabilityMediator extends Observable {
26:
27:            private static HostAvailabilityMediator mediator = new HostAvailabilityMediator();
28:
29:            /*
30:             * Singleton - private constructor
31:             */
32:
33:            private HostAvailabilityMediator() {
34:            }
35:
36:            /*
37:             * @ returns the reference to the Singleton
38:             */
39:
40:            public static HostAvailabilityMediator getHostAvailabilityMediator() {
41:                return mediator;
42:            }
43:
44:            /*
45:             * adds a observer or a intrested party to the list, to notify in case there
46:             * are changes in the host availability
47:             */
48:
49:            public static final void addHostAvailabilityListener(
50:                    HostAvailabilityListener hal) {
51:                getHostAvailabilityMediator().addObserver(((Observer) hal));
52:            }
53:
54:            /*
55:             * removes a observer or a intrested party from the list.
56:             */
57:
58:            public static final void removeHostAvailabilityListener(
59:                    HostAvailabilityListener hal) {
60:                getHostAvailabilityMediator().deleteObserver(((Observer) hal));
61:            }
62:
63:            /*
64:             * Notifies all the currently registered observers. Notification order
65:             * depends on the Observable implementation
66:             */
67:
68:            public static final void notifyListeners(HostAvailabilityEvent hae) {
69:                getHostAvailabilityMediator().setChanged();
70:                getHostAvailabilityMediator().notifyObservers(hae);
71:            }
72:
73:        }
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