Source Code Cross Referenced for GmsImpl.java in  » Net » JGroups-2.4.1-sp3 » org » jgroups » protocols » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » JGroups 2.4.1 sp3 » org.jgroups.protocols 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // $Id: GmsImpl.java,v 1.5 2005/08/11 12:43:47 belaban Exp $
02:
03:        package org.jgroups.protocols;
04:
05:        import org.apache.commons.logging.Log;
06:        import org.apache.commons.logging.LogFactory;
07:        import org.jgroups.*;
08:
09:        import java.util.Vector;
10:
11:        public abstract class GmsImpl {
12:            protected GMS gms = null;
13:
14:            protected final Log log = LogFactory.getLog(getClass());
15:            final boolean warn = log.isWarnEnabled();
16:
17:            public abstract void init(); // initialize variables
18:
19:            public abstract void join(Address mbr);
20:
21:            public abstract void leave(Address mbr);
22:
23:            public abstract void suspect(Address mbr);
24:
25:            public abstract void merge(Vector coords);
26:
27:            public abstract boolean handleJoin(Address mbr);
28:
29:            public abstract void handleLeave(Address mbr, boolean suspected);
30:
31:            public abstract void handleViewChange(ViewId new_view, Vector mbrs);
32:
33:            public abstract View handleMerge(ViewId other_view,
34:                    Vector other_members);
35:
36:            public abstract void handleSuspect(Address mbr);
37:
38:            public boolean handleUpEvent(Event evt) {
39:                return true;
40:            }
41:
42:            public boolean handleDownEvent(Event evt) {
43:                return true;
44:            }
45:
46:            protected void wrongMethod(String method_name) {
47:                if (log.isErrorEnabled())
48:                    log.error("method " + method_name
49:                            + "() should not be sent to an instance of "
50:                            + getClass().getName());
51:            }
52:
53:            /**
54:               Returns potential coordinator based on lexicographic ordering of member addresses. Another
55:               approach would be to keep track of the primary partition and return the first member if we
56:               are the primary partition.
57:             */
58:            protected boolean iWouldBeCoordinator(Vector new_mbrs) {
59:                Membership tmp_mbrs = gms.mbrs.copy();
60:                tmp_mbrs.merge(new_mbrs, null);
61:                tmp_mbrs.sort();
62:                if (tmp_mbrs.size() <= 0 || gms.local_addr == null)
63:                    return false;
64:                return gms.local_addr.equals(tmp_mbrs.elementAt(0));
65:            }
66:
67:        }
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