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


001:        package org.jgroups.tests;
002:
003:        import java.io.Serializable;
004:        import java.util.ArrayList;
005:        import java.util.Iterator;
006:        import java.util.List;
007:        import java.util.Random;
008:
009:        import junit.framework.Test;
010:        import junit.framework.TestCase;
011:        import junit.framework.TestSuite;
012:
013:        import org.jgroups.Address;
014:        import org.jgroups.BlockEvent;
015:        import org.jgroups.ChannelClosedException;
016:        import org.jgroups.ChannelNotConnectedException;
017:        import org.jgroups.JChannel;
018:        import org.jgroups.Message;
019:        import org.jgroups.TimeoutException;
020:        import org.jgroups.View;
021:        import org.jgroups.ViewId;
022:        import org.jgroups.util.Util;
023:
024:        /**
025:         * Virtual Synchrony guarantees that views in a group are observed 
026:         * in the same order by all group members and that views are totally ordered 
027:         * with respect to all regular messages in a group. 
028:         * 
029:         * Therefore, in virtually synchronous group communication model, all members 
030:         * that observe the same two consecutive views, receive the same set of regular 
031:         * multicast messages between those two views.
032:         * 
033:         * VirtualSynchronyTest verifies virtual synchrony as follows. Each surviving member P  
034:         * from a view Vm that receives a new view Vn sends a message M to group coordinator Q 
035:         * containing number of messages received in view Vm. Each member P upon receiving 
036:         * a new view sends a random number of messages to everyone in the group.
037:         * 
038:         * Group coordinator Q upon receiving each message M from a member P verifies 
039:         * if virtual synchrony is satisifed.
040:         * 
041:         * 
042:         * @author Vladimir Blagojevic
043:         * @version $Id$ 
044:         *
045:         */
046:        public class VirtualSynchronyTest extends TestCase {
047:
048:            private final static String CHANNEL_PROPS = "flush-udp.xml";
049:            private final static int INITIAL_NUMBER_OF_MEMBERS = 5;
050:            private int runningTime = 1000 * 50; // 50 secs
051:            private Random r = new Random();
052:
053:            public VirtualSynchronyTest(String arg0) {
054:                super (arg0);
055:            }
056:
057:            public void testVSynch() throws Exception {
058:                long start = System.currentTimeMillis();
059:                boolean running = true;
060:                List members = new ArrayList();
061:
062:                //first spawn and join
063:                for (int i = 0; i < INITIAL_NUMBER_OF_MEMBERS; i++) {
064:                    GroupMemberThread member = new GroupMemberThread("Member");
065:                    member.start();
066:                    members.add(member);
067:                    Util.sleep(getRandomDelayInSeconds(4, 6) * 1000);
068:                }
069:
070:                for (; running;) {
071:
072:                    //and then flip a coin
073:                    if (r.nextBoolean()) {
074:                        Util.sleep(getRandomDelayInSeconds(3, 8) * 1000);
075:                        GroupMemberThread member = new GroupMemberThread(
076:                                "Member");
077:                        member.start();
078:                        members.add(member);
079:                    } else if (members.size() > 1) {
080:                        Util.sleep(getRandomDelayInSeconds(3, 8) * 1000);
081:                        GroupMemberThread unluckyBastard = (GroupMemberThread) members
082:                                .get(r.nextInt(members.size()));
083:                        members.remove(unluckyBastard);
084:                        unluckyBastard.setRunning(false);
085:                    }
086:                    running = System.currentTimeMillis() - start <= runningTime;
087:                    System.out.println("Running time "
088:                            + ((System.currentTimeMillis() - start) / 1000)
089:                            + " secs");
090:                }
091:                System.out
092:                        .println("Done, Virtual Synchrony satisfied in all tests ");
093:            }
094:
095:            protected int getRandomDelayInSeconds(int from, int to) {
096:                return from + r.nextInt(to - from);
097:            }
098:
099:            protected void setUp() throws Exception {
100:                super .setUp();
101:            }
102:
103:            protected void tearDown() throws Exception {
104:                super .tearDown();
105:            }
106:
107:            public static Test suite() {
108:                return new TestSuite(VirtualSynchronyTest.class);
109:            }
110:
111:            public static void main(String[] args) {
112:                String[] testCaseName = { VirtualSynchronyTest.class.getName() };
113:                junit.textui.TestRunner.main(testCaseName);
114:            }
115:
116:            private static class GroupMemberThread extends Thread {
117:                JChannel ch = null;
118:                int numberOfMessagesInView = 0;
119:                View currentView;
120:                View prevView;
121:                List payloads;
122:                VSynchPayload payload;
123:                volatile boolean running = true;
124:                Random r;
125:                int messagesSentPerView = 0;
126:
127:                public GroupMemberThread(String name) {
128:                    super (name);
129:                    payloads = new ArrayList();
130:                    r = new Random();
131:                    messagesSentPerView = r.nextInt(25);
132:                }
133:
134:                public String getAddress() {
135:                    if (ch != null && ch.isConnected()) {
136:                        return ch.getLocalAddress().toString();
137:                    } else {
138:                        return "disconnected " + getName();
139:                    }
140:                }
141:
142:                public void setRunning(boolean b) {
143:                    running = false;
144:                    System.out.println("Disconnect " + getAddress());
145:                    if (ch != null)
146:                        ch.close();
147:                }
148:
149:                public void run() {
150:                    try {
151:                        ch = new JChannel(CHANNEL_PROPS);
152:                        ch.connect("vsynchtest");
153:                    } catch (Exception e) {
154:                        e.printStackTrace();
155:                    }
156:
157:                    while (running) {
158:                        Object msgReceived = null;
159:                        try {
160:                            msgReceived = ch.receive(0);
161:                            if (!running) {
162:                                // I am not a group member anymore so
163:                                // I will discard any transient message I
164:                                // receive
165:                            } else {
166:                                if (msgReceived instanceof  View) {
167:                                    gotView(msgReceived);
168:                                }
169:
170:                                if (msgReceived instanceof  Message) {
171:                                    gotMessage(msgReceived);
172:                                }
173:
174:                                if (msgReceived instanceof  BlockEvent) {
175:                                    ch.blockOk();
176:                                }
177:                            }
178:
179:                        } catch (TimeoutException e) {
180:                        } catch (Exception e) {
181:                            ch.close();
182:                            running = false;
183:                        }
184:                    }
185:                }
186:
187:                private void gotMessage(Object msgReceived) {
188:                    Message msg = (Message) msgReceived;
189:                    Object m = msg.getObject();
190:
191:                    if (m instanceof  VSynchPayload) {
192:                        VSynchPayload pay = (VSynchPayload) m;
193:                        if (prevView != null
194:                                && prevView.getVid().equals(pay.viewId)) {
195:                            payloads.add(pay);
196:                            boolean receivedAllPayloads = ((payloads.size() == prevView
197:                                    .getMembers().size()) || (payloads.size() == currentView
198:                                    .getMembers().size()));
199:                            if (receivedAllPayloads) {
200:                                VSynchPayload first = (VSynchPayload) payloads
201:                                        .get(0);
202:                                for (Iterator i = payloads.listIterator(1); i
203:                                        .hasNext();) {
204:                                    VSynchPayload p = (VSynchPayload) i.next();
205:                                    assertEquals("Member " + p + " and "
206:                                            + first + " failed VS",
207:                                            first.msgViewCount, p.msgViewCount);
208:                                }
209:                                System.out.println("VS ok, all "
210:                                        + payloads.size() + " members in "
211:                                        + prevView.getVid()
212:                                        + " view have received "
213:                                        + first.msgViewCount
214:                                        + " messages.\nAll messages sent in "
215:                                        + prevView.getVid()
216:                                        + " were delivered in "
217:                                        + prevView.getVid());
218:                            }
219:                        }
220:                    } else if (m instanceof  String) {
221:                        assertEquals(
222:                                "Member "
223:                                        + ch.getLocalAddress()
224:                                        + " received message from the wrong view. Message sender was "
225:                                        + msg.getSrc(), currentView.getVid()
226:                                        .getId(), Long.parseLong((String) m));
227:                        numberOfMessagesInView++;
228:                    }
229:                }
230:
231:                private void gotView(Object msg)
232:                        throws ChannelNotConnectedException,
233:                        ChannelClosedException {
234:                    View tmpView = (View) msg;
235:                    if (currentView != null) {
236:                        payload = new VSynchPayload(currentView.getVid(),
237:                                numberOfMessagesInView, ch.getLocalAddress());
238:                        ch.send((Address) tmpView.getMembers().get(0), null,
239:                                payload);
240:                    }
241:                    numberOfMessagesInView = 0;
242:                    payloads.clear();
243:                    prevView = currentView;
244:                    currentView = tmpView;
245:                    // send our allotment of messages
246:                    for (int i = 0; i < messagesSentPerView; i++) {
247:                        ch.send(null, null, Long.toString(currentView.getVid()
248:                                .getId()));
249:                    }
250:                }
251:            }
252:
253:            private static class VSynchPayload implements  Serializable {
254:                public ViewId viewId;
255:
256:                public int msgViewCount;
257:
258:                public Address member;
259:
260:                public VSynchPayload(ViewId viewId, int numbreOfMessagesInView,
261:                        Address a) {
262:                    super ();
263:                    this .viewId = viewId;
264:                    this .msgViewCount = numbreOfMessagesInView;
265:                    this .member = a;
266:                }
267:
268:                public String toString() {
269:                    return "[member=" + member + ",viewId=" + viewId.getId()
270:                            + ",msgCount=" + msgViewCount + "]";
271:                }
272:
273:            }
274:        }
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