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2pc.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Two-Phase Commit Visualization</title>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
flex-direction: column;
align-items: center;
background-color: #f4f4f9;
margin: 0;
padding: 20px;
}
canvas {
border: 1px solid #ccc;
background-color: #fff;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
margin-bottom: 20px;
}
.controls {
display: flex;
flex-wrap: wrap;
gap: 10px;
margin-bottom: 20px;
justify-content: center;
}
button {
padding: 8px 16px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
margin: 2px;
}
button:disabled {
background-color: #cccccc;
cursor: not-allowed;
}
.control-group {
border: 1px solid #ddd;
padding: 10px;
border-radius: 5px;
margin: 5px;
}
.log-panel {
width: 900px;
height: 150px;
overflow-y: auto;
background-color: #2c3e50;
color: #ecf0f1;
padding: 10px;
font-family: monospace;
border-radius: 5px;
}
.status {
margin: 10px 0;
font-weight: bold;
font-size: 18px;
color: #2c3e50;
}
.state-machine {
width: 900px;
height: 100px;
background-color: #ecf0f1;
border-radius: 5px;
margin-top: 10px;
padding: 10px;
display: flex;
justify-content: space-around;
align-items: center;
position: relative;
}
.state {
padding: 8px 15px;
border-radius: 20px;
background-color: #bdc3c7;
color: #2c3e50;
font-weight: bold;
position: relative;
z-index: 2;
}
.state.active {
background-color: #3498db;
color: white;
}
.state-connector {
position: absolute;
height: 4px;
background-color: #bdc3c7;
top: 50%;
transform: translateY(-50%);
z-index: 1;
}
.state-connector.active {
background-color: #3498db;
}
.timer {
position: absolute;
top: 10px;
right: 10px;
background-color: rgba(0,0,0,0.7);
color: white;
padding: 5px 10px;
border-radius: 5px;
font-family: monospace;
}
.speed-control {
display: flex;
align-items: center;
margin-top: 10px;
}
.speed-control label {
margin-right: 10px;
}
.issue-controls {
display: flex;
flex-direction: column;
gap: 5px;
}
.log-entry {
margin-bottom: 5px;
border-bottom: 1px solid #34495e;
padding-bottom: 5px;
}
.log-time {
color: #3498db;
}
.log-event {
color: #2ecc71;
}
.log-warning {
color: #f39c12;
}
.log-error {
color: #e74c3c;
}
.queue-status {
position: absolute;
top: 10px;
left: 10px;
background-color: rgba(0,0,0,0.7);
color: white;
padding: 5px 10px;
border-radius: 5px;
font-family: monospace;
}
button.color-changing {
transition: background-color 0.3s ease;
}
button.color-changing.clicked {
background-color: #e74c3c;
}
</style>
</head>
<body>
<h1>Two-Phase Commit Visualization</h1>
<canvas id="protocolCanvas" width="900" height="500"></canvas>
<div class="controls">
<div class="control-group">
<div>
<button id="startBtn" class="color-changing">Start</button>
<button id="pauseBtn" class="color-changing">Pause</button>
<button id="resetBtn" class="color-changing">Reset</button>
</div>
<div class="speed-control">
<label for="speedSlider">Speed:</label>
<input type="range" id="speedSlider" min="1" max="10" value="3">
<span id="speedValue">3x</span>
</div>
</div>
<div class="control-group">
<div>
<button id="nextStepBtn" disabled class="color-changing">Next Step</button>
<button id="autoBtn" class="color-changing">Auto Run</button>
</div>
</div>
</div>
<div class="status" id="statusText">Status: Ready</div>
<div class="state-machine">
<div class="state" id="state-ready">Ready</div>
<div class="state-connector" style="width: 80px; left: 120px;"></div>
<div class="state" id="state-prepare">Prepare</div>
<div class="state-connector" style="width: 80px; left: 300px;"></div>
<div class="state" id="state-voting">Voting</div>
<div class="state-connector" style="width: 80px; left: 480px;"></div>
<div class="state" id="state-decide">Decide</div>
<div class="state-connector" style="width: 80px; left: 660px;"></div>
<div class="state" id="state-complete">Complete</div>
</div>
<div class="log-panel" id="logPanel">
<div class="log-entry"><span class="log-time">[System]</span> <span class="log-event">2PC visualization initialized</span></div>
</div>
<script>
const canvas = document.getElementById('protocolCanvas');
const ctx = canvas.getContext('2d');
const logPanel = document.getElementById('logPanel');
const statusText = document.getElementById('statusText');
const speedSlider = document.getElementById('speedSlider');
const speedValue = document.getElementById('speedValue');
const nextStepBtn = document.getElementById('nextStepBtn');
const autoBtn = document.getElementById('autoBtn');
const states = {
ready: document.getElementById('state-ready'),
prepare: document.getElementById('state-prepare'),
voting: document.getElementById('state-voting'),
decide: document.getElementById('state-decide'),
complete: document.getElementById('state-complete')
};
const stateConnectors = document.querySelectorAll('.state-connector');
const nodeColors = [
'#3498db', '#e74c3c', '#2ecc71', '#f39c12', '#9b59b6', '#1abc9c'
];
const coordinator = {
x: 150, y: 250, id: 'Coordinator',
color: nodeColors[0], status: 'Ready',
isDown: false, role: 'Coordinator'
};
const participants = [
{ x: 250, y: 100, id: 'Participant1', color: nodeColors[1], status: 'Ready', isDown: false, role: 'Participant' },
{ x: 400, y: 150, id: 'Participant2', color: nodeColors[2], status: 'Ready', isDown: false, role: 'Participant' },
{ x: 500, y: 250, id: 'Participant3', color: nodeColors[3], status: 'Ready', isDown: false, role: 'Participant' },
{ x: 400, y: 350, id: 'Participant4', color: nodeColors[4], status: 'Ready', isDown: false, role: 'Participant' },
{ x: 250, y: 400, id: 'Participant5', color: nodeColors[5], status: 'Ready', isDown: false, role: 'Participant' }
];
const allNodes = [coordinator, ...participants];
let currentPhase = 0;
let votes = [];
let decision = null;
let isRunning = false;
let isPaused = false;
let isAuto = false;
let activeMessages = [];
let messageQueue = [];
let speedMultiplier = 3;
let timeoutTimer = null;
let timeoutDuration = 15000;
let timeoutStart = 0;
function updateStateMachine(state) {
Object.values(states).forEach(s => s.classList.remove('active'));
stateConnectors.forEach(c => c.classList.remove('active'));
if (state === 'ready') {
states.ready.classList.add('active');
} else if (state === 'prepare') {
states.prepare.classList.add('active');
states.ready.classList.add('active');
stateConnectors[0].classList.add('active');
} else if (state === 'voting') {
states.voting.classList.add('active');
states.prepare.classList.add('active');
states.ready.classList.add('active');
stateConnectors[0].classList.add('active');
stateConnectors[1].classList.add('active');
} else if (state === 'decide') {
states.decide.classList.add('active');
states.voting.classList.add('active');
states.prepare.classList.add('active');
states.ready.classList.add('active');
stateConnectors[0].classList.add('active');
stateConnectors[1].classList.add('active');
stateConnectors[2].classList.add('active');
} else if (state === 'complete') {
states.complete.classList.add('active');
states.decide.classList.add('active');
states.voting.classList.add('active');
states.prepare.classList.add('active');
states.ready.classList.add('active');
stateConnectors[0].classList.add('active');
stateConnectors[1].classList.add('active');
stateConnectors[2].classList.add('active');
stateConnectors[3].classList.add('active');
}
}
function drawNode(node) {
ctx.beginPath();
ctx.arc(node.x, node.y, 20, 0, Math.PI * 2);
ctx.fillStyle = node.isDown ? '#95a5a6' : node.color;
ctx.fill();
ctx.strokeStyle = '#2c3e50';
ctx.stroke();
ctx.fillStyle = '#000';
ctx.font = 'bold 12px Arial';
ctx.textAlign = 'center';
ctx.fillText(node.id, node.x, node.y + 30);
ctx.font = '10px Arial';
ctx.fillText(node.status, node.x, node.y - 25);
if (node.isDown) {
ctx.fillStyle = '#e74c3c';
ctx.fillText('DOWN', node.x, node.y + 50);
}
}
function drawMessage(from, to, progress, label, color) {
const x = from.x + (to.x - from.x) * progress;
const y = from.y + (to.y - from.y) * progress;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(x, y);
ctx.strokeStyle = color;
ctx.lineWidth = 2;
ctx.stroke();
const angle = Math.atan2(to.y - from.y, to.x - from.x);
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(x - 10 * Math.cos(angle - Math.PI/6),
y - 10 * Math.sin(angle - Math.PI/6));
ctx.lineTo(x - 10 * Math.cos(angle + Math.PI/6),
y - 10 * Math.sin(angle + Math.PI/6));
ctx.closePath();
ctx.fillStyle = color;
ctx.fill();
ctx.fillStyle = color;
ctx.font = 'bold 12px Arial';
ctx.textAlign = 'center';
ctx.fillText(label, x, y - 15);
}
function addLog(message, type = 'event') {
const now = new Date();
const timeStr = now.toTimeString().substring(0, 8) + '.' + now.getMilliseconds().toString().padStart(3, '0');
const logEntry = document.createElement('div');
logEntry.className = 'log-entry';
const timeSpan = document.createElement('span');
timeSpan.className = 'log-time';
timeSpan.textContent = `[${timeStr}]`;
const messageSpan = document.createElement('span');
messageSpan.className = `log-${type}`;
messageSpan.textContent = ` ${message}`;
logEntry.appendChild(timeSpan);
logEntry.appendChild(messageSpan);
logPanel.appendChild(logEntry);
logPanel.scrollTop = logPanel.scrollHeight;
}
function processMessageQueue() {
if (messageQueue.length > 0) {
const count = messageQueue.length;
activeMessages.push(...messageQueue);
messageQueue = [];
addLog(`Processed ${count} messages from queue`, "event");
updateQueueStatus();
}
}
function updateQueueStatus() {
let queueStatus = document.querySelector('.queue-status');
if (!queueStatus) {
queueStatus = document.createElement('div');
queueStatus.className = 'queue-status';
canvas.parentNode.appendChild(queueStatus);
}
queueStatus.textContent = `Queue: ${messageQueue.length} | Active: ${activeMessages.length}`;
}
function sendMessage(from, to, label, color, onReceive, onComplete) {
if (to.isDown) {
addLog(`Message to ${to.id} failed (target is down)`, "warning");
return null;
}
const message = {
from, to, label, color,
progress: 0,
speed: 0.002 * speedMultiplier,
onReceive, onComplete
};
if (isAuto) {
activeMessages.push(message);
} else {
messageQueue.push(message);
addLog(`Queued ${label} from ${from.id} to ${to.id}`, "event");
}
updateQueueStatus();
return message;
}
function startTimeout() {
if (timeoutTimer) clearTimeout(timeoutTimer);
timeoutStart = Date.now();
timeoutTimer = setTimeout(() => {
if (currentPhase === 1 && isRunning && !isPaused) {
addLog(`Timeout reached - aborting transaction`, "error");
decision = 'ABORT';
votes = [];
checkVotes();
}
}, timeoutDuration);
}
function updateTimeoutDisplay() {
if (!timeoutTimer || currentPhase !== 1) {
clearTimeoutDisplay();
return;
}
const elapsed = Date.now() - timeoutStart;
const remaining = Math.max(0, timeoutDuration - elapsed);
const timerDiv = document.querySelector('.timer');
if (!timerDiv) {
const newTimer = document.createElement('div');
newTimer.className = 'timer';
canvas.parentNode.appendChild(newTimer);
}
document.querySelector('.timer').textContent = `Timeout: ${(remaining/1000).toFixed(1)}s`;
}
function clearTimeoutDisplay() {
const timer = document.querySelector('.timer');
if (timer) timer.remove();
}
function preparePhase() {
currentPhase = 1;
updateStateMachine('prepare');
statusText.textContent = 'Status: Prepare Phase';
addLog('Coordinator sending PREPARE to all participants');
participants.forEach(participant => {
if (participant.isDown) return;
participant.status = 'Preparing...';
sendMessage(
coordinator,
participant,
'PREPARE',
coordinator.color,
() => {
participant.status = 'Received PREPARE';
addLog(`${participant.id} received PREPARE`);
},
() => {
setTimeout(() => {
if (participant.isDown) return;
if (Math.random() > 0.1) {
participant.status = 'Voted COMMIT';
sendMessage(
participant,
coordinator,
'VOTE-COMMIT',
participant.color,
null,
() => {
votes.push('COMMIT');
addLog(`${participant.id} voted COMMIT`);
checkVotes();
}
);
} else {
participant.status = 'Voted ABORT';
sendMessage(
participant,
coordinator,
'VOTE-ABORT',
'#e74c3c',
null,
() => {
votes.push('ABORT');
addLog(`${participant.id} voted ABORT`, "warning");
checkVotes();
}
);
}
}, 500 + Math.random() * 1000);
}
);
});
startTimeout();
}
function checkVotes() {
const activeParticipants = participants.filter(p => !p.isDown).length;
if (votes.length === activeParticipants) {
if (timeoutTimer) clearTimeout(timeoutTimer);
clearTimeoutDisplay();
if (votes.every(v => v === 'COMMIT')) {
decision = 'COMMIT';
addLog('All participants voted COMMIT. Proceeding to commit phase.', "event");
commitPhase();
} else {
decision = 'ABORT';
addLog('At least one participant voted ABORT. Transaction will be aborted.', "warning");
commitPhase();
}
}
}
function commitPhase() {
currentPhase = 2;
updateStateMachine('decide');
statusText.textContent = `Status: Commit Phase (Decision: ${decision})`;
participants.forEach(participant => {
if (participant.isDown) return;
const msgColor = decision === 'COMMIT' ? '#2ecc71' : '#e74c3c';
sendMessage(
coordinator,
participant,
decision,
msgColor,
() => {
participant.status = decision === 'COMMIT' ? 'Committed' : 'Aborted';
},
() => {
sendMessage(
participant,
coordinator,
'ACK',
participant.color,
null,
() => {
addLog(`${participant.id} acknowledged ${decision}`);
checkCompletion();
}
);
}
);
});
}
function checkCompletion() {
const acks = participants.filter(p =>
!p.isDown && (p.status === 'Committed' || p.status === 'Aborted')
).length;
const activeParticipants = participants.filter(p => !p.isDown).length;
if (acks === activeParticipants) {
currentPhase = 3;
updateStateMachine('complete');
statusText.textContent = `Status: Transaction ${decision === 'COMMIT' ? 'Committed' : 'Aborted'}`;
addLog(`Transaction ${decision === 'COMMIT' ? 'completed successfully' : 'was aborted'}`);
if (isAuto) {
setTimeout(resetProtocol, 2000);
} else {
nextStepBtn.disabled = true;
}
}
}
function resetProtocol() {
currentPhase = 0;
votes = [];
decision = null;
activeMessages = [];
messageQueue = [];
participants.forEach(p => {
p.status = 'Ready';
});
coordinator.status = 'Ready';
updateStateMachine('ready');
statusText.textContent = 'Status: Ready';
clearTimeoutDisplay();
updateQueueStatus();
if (isAuto) {
setTimeout(startProtocol, 1000);
}
}
function startProtocol() {
isRunning = true;
isPaused = false;
coordinator.status = 'Starting...';
addLog('Starting 2PC protocol');
if (isAuto) {
preparePhase();
} else {
nextStepBtn.disabled = false;
}
}
function processNextStep() {
if (!isRunning || isAuto) return;
processMessageQueue();
if (currentPhase === 0) {
preparePhase();
} else if (currentPhase === 1 && votes.length === participants.filter(p => !p.isDown).length) {
commitPhase();
} else if (currentPhase === 2) {
checkCompletion();
}
}
function animate() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
allNodes.forEach(drawNode);
activeMessages.forEach((msg, index) => {
msg.progress += msg.speed;
drawMessage(msg.from, msg.to, msg.progress, msg.label, msg.color);
if (msg.progress >= 1) {
if (msg.onComplete) msg.onComplete();
activeMessages.splice(index, 1);
updateQueueStatus();
}
});
updateTimeoutDisplay();
requestAnimationFrame(animate);
}
function handleButtonClick(event) {
const button = event.currentTarget;
button.classList.add('clicked');
setTimeout(() => {
button.classList.remove('clicked');
}, 300);
}
speedSlider.addEventListener('input', function() {
speedMultiplier = parseInt(this.value);
speedValue.textContent = speedMultiplier + 'x';
});
document.getElementById('startBtn').addEventListener('click', startProtocol);
document.getElementById('startBtn').addEventListener('click', handleButtonClick);
document.getElementById('pauseBtn').addEventListener('click', function() {
isPaused = !isPaused;
if (isPaused) {
addLog('Protocol paused', "warning");
} else {
addLog('Protocol resumed', "event");
}
});
document.getElementById('pauseBtn').addEventListener('click', handleButtonClick);
document.getElementById('resetBtn').addEventListener('click', function() {
isRunning = false;
isPaused = false;
isAuto = false;
resetProtocol();
addLog('Protocol reset', "event");
});
document.getElementById('resetBtn').addEventListener('click', handleButtonClick);
document.getElementById('nextStepBtn').addEventListener('click', processNextStep);
document.getElementById('nextStepBtn').addEventListener('click', handleButtonClick);
document.getElementById('autoBtn').addEventListener('click', function() {
isAuto = !isAuto;
if (isAuto) {
addLog('Switched to auto mode', "event");
startProtocol();
} else {
addLog('Switched to manual mode', "event");
}
});
document.getElementById('autoBtn').addEventListener('click', handleButtonClick);
animate();
updateQueueStatus();
</script>
</body>
</html>