Source Code Cross Referenced for Topology.java in  » Net » JGroups-2.4.1-sp3 » org » jgroups » demos » 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.demos 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // $Id: Topology.java,v 1.7 2005/07/17 11:36:42 chrislott Exp $
002:
003:        package org.jgroups.demos;
004:
005:        import org.jgroups.*;
006:        import org.jgroups.blocks.PullPushAdapter;
007:
008:        import java.awt.*;
009:        import java.awt.event.WindowEvent;
010:        import java.awt.event.WindowListener;
011:        import java.util.Vector;
012:
013:        /**
014:         * Demonstrates the membership service. Each member is represented by a rectangle that contains the
015:         * addresses of all the members. The coordinator (= oldest member in the group) is painted in blue.
016:         * New members can be started; all existing members will update their graphical appearance to reflect
017:         * the new membership. When the coordinator itself is killed, another one will take over (the next in rank).<p>
018:         * A nice demo is to start a number of Topology instances at the same time. All of them will be blue (all are
019:         * coordinators since they don't find each other). Then the MERGE2 protocol sets in and only one will retain
020:         * its coordinator role.
021:         * @todo Needs to be ported to Swing.
022:         * @author Bela Ban
023:         */
024:        public class Topology extends Frame implements  WindowListener,
025:                MembershipListener {
026:            private final Vector members = new Vector();
027:            private final Font myFont;
028:            private final FontMetrics fm;
029:            private final Color node_color = new Color(250, 220, 100);
030:            private boolean coordinator = false;
031:            private static final int NormalStyle = 0;
032:            private static final int CheckStyle = 1;
033:            private Channel channel;
034:            private Object my_addr = null;
035:            private static final String channel_name = "FD-Heartbeat";
036:
037:            public Topology() {
038:                addWindowListener(this );
039:                //g=getGraphics();
040:                fm = getFontMetrics(new Font("Helvetica", Font.PLAIN, 12));
041:                myFont = new Font("Helvetica", Font.PLAIN, 12);
042:
043:            }
044:
045:            public void addNode(Object member) {
046:                Object tmp;
047:                for (int i = 0; i < members.size(); i++) {
048:                    tmp = members.elementAt(i);
049:                    if (member.equals(tmp))
050:                        return;
051:                }
052:                members.addElement(member);
053:                repaint();
054:            }
055:
056:            public void removeNode(Object member) {
057:                Object tmp;
058:                for (int i = 0; i < members.size(); i++) {
059:                    tmp = members.elementAt(i);
060:                    if (member.equals(tmp)) {
061:                        members.removeElement(members.elementAt(i));
062:                        break;
063:                    }
064:                }
065:                repaint();
066:            }
067:
068:            public void drawNode(Graphics g, int x, int y, String label,
069:                    int style) {
070:                Color old = g.getColor();
071:                int width, height;
072:                width = fm.stringWidth(label) + 10;
073:                height = fm.getHeight() + 5;
074:
075:                g.setColor(node_color);
076:
077:                g.fillRect(x, y, width, height);
078:                g.setColor(old);
079:                g.drawString(label, x + 5, y + 15);
080:                g.drawRoundRect(x - 1, y - 1, width + 1, height + 1, 10, 10);
081:                if (style == CheckStyle) {
082:                    g
083:                            .drawRoundRect(x - 2, y - 2, width + 2, height + 2,
084:                                    10, 10);
085:                    g
086:                            .drawRoundRect(x - 3, y - 3, width + 3, height + 3,
087:                                    10, 10);
088:                }
089:            }
090:
091:            public void drawTopology(Graphics g) {
092:                int x = 20, y = 50;
093:                String label;
094:                Dimension box = getSize();
095:                Color old = g.getColor();
096:
097:                if (coordinator) {
098:                    g.setColor(Color.cyan);
099:                    g.fillRect(11, 31, box.width - 21, box.height - 61);
100:                    g.setColor(old);
101:                }
102:
103:                g.drawRect(10, 30, box.width - 20, box.height - 60);
104:                g.setFont(myFont);
105:
106:                for (int i = 0; i < members.size(); i++) {
107:                    label = members.elementAt(i).toString();
108:                    drawNode(g, x, y, label, NormalStyle);
109:                    y += 50;
110:                }
111:
112:            }
113:
114:            public void paint(Graphics g) {
115:                drawTopology(g);
116:            }
117:
118:            /* ------------ Callbacks ------------- */
119:
120:            public void viewAccepted(View view) {
121:                setState(view.getMembers());
122:            }
123:
124:            public void suspect(Address suspected_mbr) {
125:            }
126:
127:            public void block() {
128:            }
129:
130:            public void setState(Vector mbrs) {
131:                members.removeAllElements();
132:                for (int i = 0; i < mbrs.size(); i++)
133:                    addNode(mbrs.elementAt(i));
134:                if (mbrs.size() <= 1
135:                        || (mbrs.size() > 1 && mbrs.elementAt(0)
136:                                .equals(my_addr)))
137:                    coordinator = true;
138:                else
139:                    coordinator = false;
140:                repaint();
141:            }
142:
143:            public void coordinatorChosen() {
144:                coordinator = true;
145:                repaint();
146:            }
147:
148:            public void windowActivated(WindowEvent e) {
149:            }
150:
151:            public void windowClosed(WindowEvent e) {
152:            }
153:
154:            public void windowClosing(WindowEvent e) {
155:                channel.close();
156:                System.exit(0);
157:            }
158:
159:            public void windowDeactivated(WindowEvent e) {
160:            }
161:
162:            public void windowDeiconified(WindowEvent e) {
163:            }
164:
165:            public void windowIconified(WindowEvent e) {
166:            }
167:
168:            public void windowOpened(WindowEvent e) {
169:            }
170:
171:            public void start() throws Exception {
172:
173:                //String props="TCP:" +
174:                //   "TCPPING(timeout=2000;num_initial_members=1;port_range=3;" +
175:                //  "initial_hosts=localhost[8880]):" +
176:                //  "FD:STABLE:NAKACK:FLUSH:GMS(join_timeout=12000):VIEW_ENFORCER:QUEUE";
177:
178:                // test for pbcast
179:                //String props="UDP:PING:FD:" +
180:                //           "pbcast.PBCAST:UNICAST:FRAG:pbcast.GMS:" +
181:                //           "STATE_TRANSFER:QUEUE";
182:
183:                // test for pbcast
184:                //String props="TCP:TCPPING(port_range=2;initial_hosts=daddy[8880],terrapin[8880]):FD:" +
185:                //            "pbcast.PBCAST:UNICAST:FRAG:pbcast.GMS:" +
186:                //           "STATE_TRANSFER:QUEUE";
187:
188:                // test2 for pbcast
189:                //String props="UDP:PING:FD:" +
190:                //   "pbcast.PBCAST:UNICAST:FRAG:pbcast.GMS:" +
191:                //  "pbcast.STATE_TRANSFER";
192:
193:                // String props=null; // default properties
194:
195:                String props = "UDP(mcast_addr=224.0.0.35;mcast_port=45566;ip_ttl=32;"
196:                        + "mcast_send_buf_size=150000;mcast_recv_buf_size=80000):"
197:                        + "PING(timeout=2000;num_initial_members=3):"
198:                        + "MERGE2(min_interval=5000;max_interval=10000):"
199:                        + "FD_SOCK:"
200:                        + "VERIFY_SUSPECT(timeout=1500):"
201:                        + "pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800):"
202:                        + "UNICAST(timeout=5000):"
203:                        + "pbcast.STABLE(desired_avg_gossip=20000):"
204:                        + "FRAG(frag_size=4096;down_thread=false;up_thread=false):"
205:                        + "pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;"
206:                        + "shun=false;print_local_addr=true)";
207:
208:                channel = new JChannel(props);
209:                channel.connect(channel_name);
210:                new PullPushAdapter(channel, this );
211:                my_addr = channel.getLocalAddress();
212:                if (my_addr != null)
213:                    setTitle(my_addr.toString());
214:                pack();
215:                show();
216:            }
217:
218:            public static void main(String[] args) {
219:                try {
220:                    Topology top = new Topology();
221:                    top.setLayout(null);
222:                    top.setSize(240, 507);
223:                    top.start();
224:                } catch (Exception e) {
225:                    System.err.println(e);
226:                    e.printStackTrace();
227:                    System.exit(0);
228:                }
229:            }
230:
231:        }
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