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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8"> |
| 5 | + <title>Event Transport Demo</title> |
| 6 | + <style> |
| 7 | + body { font-family: sans-serif; margin: 20px; } |
| 8 | + #log { border: 1px solid #ccc; padding: 10px; height: 300px; overflow-y: scroll; background: #f9f9f9; } |
| 9 | + .event { margin-bottom: 5px; border-bottom: 1px solid #eee; } |
| 10 | + .controls { margin-bottom: 10px; } |
| 11 | + </style> |
| 12 | +</head> |
| 13 | +<body> |
| 14 | + <h1>Event Transport Demo</h1> |
| 15 | + <div class="controls"> |
| 16 | + <label for="mode">Transport Mode:</label> |
| 17 | + <select id="mode"> |
| 18 | + <option value="LP">Long Polling</option> |
| 19 | + <option value="SSE">SSE</option> |
| 20 | + </select> |
| 21 | + <button id="start">Start Listening</button> |
| 22 | + <button id="stop">Stop</button> |
| 23 | + <input type="text" id="msg" placeholder="Message to send"> |
| 24 | + <button id="send">Send Event</button> |
| 25 | + </div> |
| 26 | + <div id="log"></div> |
| 27 | + |
| 28 | + <script> |
| 29 | + const logDiv = document.getElementById('log'); |
| 30 | + const modeSelect = document.getElementById('mode'); |
| 31 | + const startBtn = document.getElementById('start'); |
| 32 | + const stopBtn = document.getElementById('stop'); |
| 33 | + const sendBtn = document.getElementById('send'); |
| 34 | + const msgInput = document.getElementById('msg'); |
| 35 | + |
| 36 | + let lastOffset = 0; |
| 37 | + let running = false; |
| 38 | + let eventSource = null; |
| 39 | + |
| 40 | + function log(msg) { |
| 41 | + const div = document.createElement('div'); |
| 42 | + div.className = 'event'; |
| 43 | + div.textContent = `${new Date().toLocaleTimeString()}: ${msg}`; |
| 44 | + logDiv.appendChild(div); |
| 45 | + logDiv.scrollTop = logDiv.scrollHeight; |
| 46 | + } |
| 47 | + |
| 48 | + async function startLongPolling() { |
| 49 | + running = true; |
| 50 | + log('Starting Long Polling...'); |
| 51 | + while (running) { |
| 52 | + try { |
| 53 | + const response = await fetch(`http://localhost:8081/events?lastOffset=${lastOffset}&timeout=10`); |
| 54 | + if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`); |
| 55 | + const events = await response.json(); |
| 56 | + events.forEach(event => { |
| 57 | + log(`[LP] Received: ${JSON.stringify(event.data.message)} (ID: ${event.id})`); |
| 58 | + lastOffset = Math.max(lastOffset, event.id); |
| 59 | + }); |
| 60 | + } catch (e) { |
| 61 | + if (running) { |
| 62 | + log(`Error: ${e.message}`); |
| 63 | + await new Promise(r => setTimeout(r, 2000)); |
| 64 | + } |
| 65 | + } |
| 66 | + } |
| 67 | + } |
| 68 | + |
| 69 | + function startSse() { |
| 70 | + log('Starting SSE...'); |
| 71 | + running = true; |
| 72 | + eventSource = new EventSource(`http://localhost:8081/events?lastOffset=${lastOffset}`); |
| 73 | + eventSource.onmessage = (event) => { |
| 74 | + const data = JSON.parse(event.data); |
| 75 | + log(`[SSE] Received: ${JSON.stringify(data.data.message)} (ID: ${data.id})`); |
| 76 | + lastOffset = Math.max(lastOffset, data.id); |
| 77 | + }; |
| 78 | + eventSource.onerror = (e) => { |
| 79 | + log('SSE Error, reconnecting...'); |
| 80 | + }; |
| 81 | + } |
| 82 | + |
| 83 | + startBtn.onclick = () => { |
| 84 | + if (running) return; |
| 85 | + const mode = modeSelect.value; |
| 86 | + if (mode === 'LP') { |
| 87 | + startLongPolling(); |
| 88 | + } else { |
| 89 | + startSse(); |
| 90 | + } |
| 91 | + }; |
| 92 | + |
| 93 | + stopBtn.onclick = () => { |
| 94 | + running = false; |
| 95 | + if (eventSource) { |
| 96 | + eventSource.close(); |
| 97 | + eventSource = null; |
| 98 | + } |
| 99 | + log('Stopped.'); |
| 100 | + }; |
| 101 | + |
| 102 | + sendBtn.onclick = async () => { |
| 103 | + const message = msgInput.value || 'Hello'; |
| 104 | + try { |
| 105 | + const response = await fetch('http://localhost:8081/events', { |
| 106 | + method: 'POST', |
| 107 | + headers: { 'Content-Type': 'application/json' }, |
| 108 | + body: JSON.stringify({ message: message }) |
| 109 | + }); |
| 110 | + if (response.ok) { |
| 111 | + log(`Sent: ${message}`); |
| 112 | + msgInput.value = ''; |
| 113 | + } |
| 114 | + } catch (e) { |
| 115 | + log(`Send Error: ${e.message}`); |
| 116 | + } |
| 117 | + }; |
| 118 | + </script> |
| 119 | +</body> |
| 120 | +</html> |
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