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package protocols.implementations;
import java.util.Vector;
import core.VSInternalProcess;
import core.VSTask;
import core.time.VSVectorTime;
import events.implementations.VSLamportTimestampEvent;
import events.implementations.VSTimestampMonitorEvent;
import events.implementations.VSTimestampTriggeredEvent;
import events.implementations.VSVectorTimestampEvent;
import events.implementations.VSVectorClockMonitor;
import protocols.VSAbstractProtocol;
/**
* Demonstration protocol showing how to use timestamp-triggered events.
* This protocol sets up various timestamp conditions and monitors them.
*
* Example scenarios:
* - Log message when Lamport time reaches 10
* - Change process color when vector clock element reaches threshold
* - Trigger protocol action at specific timestamp conditions
*
* @author Paul C. Buetow
*/
public class VSTimestampDemoProtocol extends VSAbstractProtocol {
public VSTimestampDemoProtocol() {
super(HAS_ON_SERVER_START);
}
private VSTimestampMonitorEvent lamportMonitor;
private VSVectorClockMonitor vectorMonitor;
@Override
public void onServerInit() {
initInteger("lamport.target", 10, "Target Lamport time", 1, 100, "");
initString("lamport.action", "Log message", "Action to perform");
Vector<Integer> defaultVector = new Vector<>();
defaultVector.add(5);
defaultVector.add(3);
defaultVector.add(7);
initVector("vector.target", defaultVector, "Target vector clock values");
initString("vector.condition", "GREATER_EQUAL", "Comparison operator (EQUAL, GREATER_THAN, LESS_THAN, GREATER_EQUAL, LESS_EQUAL)");
}
@Override
public void onClientInit() {
initInteger("lamport.target", 15, "Target Lamport time", 1, 100, "");
initString("lamport.action", "Highlight process", "Action to perform");
Vector<Integer> defaultVector = new Vector<>();
defaultVector.add(3);
defaultVector.add(8);
defaultVector.add(2);
initVector("vector.target", defaultVector, "Target vector clock values");
initString("vector.condition", "EQUAL", "Comparison operator");
}
@Override
public void onServerStart() {
setupTimestampEvents();
}
@Override
public void onClientStart() {
setupTimestampEvents();
}
/**
* Set up timestamp-triggered events based on configuration
*/
private void setupTimestampEvents() {
VSInternalProcess internalProcess = (VSInternalProcess) process;
// Create monitors for timestamp events
lamportMonitor = new VSTimestampMonitorEvent(1); // Check every time unit
lamportMonitor.init(internalProcess);
vectorMonitor = new VSVectorClockMonitor(internalProcess);
// Set up Lamport timestamp event
setupLamportEvent();
// Set up Vector timestamp event
setupVectorEvent();
// Start Lamport monitoring by scheduling the monitor
VSTask monitorTask = new VSTask(internalProcess.getTime() + 1,
internalProcess, lamportMonitor, VSTask.LOCAL);
internalProcess.getSimulatorCanvas().getTaskManager().addTask(monitorTask);
// Vector monitoring will be triggered by clock changes, not time
log("Timestamp demo protocol started - monitoring Lamport and Vector timestamp events");
}
/**
* Configure Lamport timestamp event
*/
private void setupLamportEvent() {
long targetLamport = getLong("lamport.target");
String action = getString("lamport.action");
VSLamportTimestampEvent lamportEvent = new VSLamportTimestampEvent(
targetLamport,
VSTimestampTriggeredEvent.ComparisonOperator.GREATER_EQUAL,
action + " (Lamport >= " + targetLamport + ")",
() -> {
// Custom action when Lamport condition is met
log("Lamport timestamp condition met! Executing: " + action);
if (action.contains("Highlight") || action.contains("highlight")) {
((VSInternalProcess) process).highlightOn();
}
}
);
lamportMonitor.addLamportEvent(lamportEvent);
}
/**
* Configure Vector timestamp event
*/
private void setupVectorEvent() {
Vector<Integer> targetVectorInts = getVector("vector.target");
String conditionStr = getString("vector.condition");
// Convert Vector<Integer> to VSVectorTime
VSVectorTime targetVector = new VSVectorTime(0);
for (Integer val : targetVectorInts) {
targetVector.add(val.longValue());
}
// Parse condition string
VSTimestampTriggeredEvent.ComparisonOperator operator;
try {
operator = VSTimestampTriggeredEvent.ComparisonOperator.valueOf(conditionStr);
} catch (IllegalArgumentException e) {
operator = VSTimestampTriggeredEvent.ComparisonOperator.GREATER_EQUAL;
log("Invalid condition '" + conditionStr + "', using GREATER_EQUAL");
}
VSVectorTimestampEvent vectorEvent = new VSVectorTimestampEvent(
targetVector,
operator,
"Vector clock condition: " + targetVector + " " + operator,
() -> {
// Custom action when Vector condition is met
log("Vector timestamp condition met! Current: " +
((VSInternalProcess) process).getVectorTime());
((VSInternalProcess) process).highlightOn();
}
);
vectorMonitor.addVectorEvent(vectorEvent);
}
@Override
public void onServerRecv(core.VSMessage message) {
// Could add timestamp events based on received messages
log("Server received message - current timestamps: L=" +
((VSInternalProcess) process).getLamportTime() +
", V=" + ((VSInternalProcess) process).getVectorTime());
}
@Override
public void onClientRecv(core.VSMessage message) {
// Could add timestamp events based on received messages
log("Client received message - current timestamps: L=" +
((VSInternalProcess) process).getLamportTime() +
", V=" + ((VSInternalProcess) process).getVectorTime());
}
@Override
public String toString() {
return " [TimestampDemo]";
}
@Override
public void onServerReset() {
if (lamportMonitor != null) {
lamportMonitor.stopMonitoring();
}
if (vectorMonitor != null) {
vectorMonitor.clearVectorEvents();
}
}
@Override
public void onClientReset() {
if (lamportMonitor != null) {
lamportMonitor.stopMonitoring();
}
if (vectorMonitor != null) {
vectorMonitor.clearVectorEvents();
}
}
@Override
public void onServerSchedule() {
// No scheduled operations needed
}
@Override
public void onClientSchedule() {
// No scheduled operations needed
}
@Override
protected String createShortname(String savedShortname) {
return "TimestampDemo";
}
}
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