jw-gate/demo.js

Creates a "gate" with "locks." When all locks are open, the gate is open, useful for dealing with semi-random async events.

// Simple jw-gate Demo - Smart Device Startup System
const Gate = require('./jw-gate');

console.log('🚪 jw-gate Demo: Smart Device Startup System\n');
console.log('━'.repeat(60));
console.log('GATE STATUS: Monitoring 3 conditions for device startup');
console.log('━'.repeat(60));

// Create gate with 3 conditions - all start locked (true)
const deviceGate = new Gate(['network', 'safety', 'power'], true);

// Track state for display
let statusCount = 0;

function displayStatus() {
  statusCount++;
  const state = deviceGate.getState();
  
  console.log(`\n📊 STATUS UPDATE #${statusCount}`);
  console.log('─'.repeat(40));
  
  // Show overall gate status
  const gateStatus = state.isLocked ? '🔴 LOCKED' : '🟢 UNLOCKED';
  console.log(`Gate Status: ${gateStatus}`);
  
  // Show individual lock states
  console.log('Individual Conditions:');
  Object.entries(state.locks).forEach(([name, locked]) => {
    const status = locked ? '🔒 LOCKED' : '🔓 UNLOCKED';
    const icon = name === 'network' ? '🌐' : name === 'safety' ? '🛡️' : '⚡';
    console.log(`  ${icon} ${name.padEnd(8)}: ${status}`);
  });
  
  console.log(`Progress: ${deviceGate.getTotalLocks() - deviceGate.getLockedCount()}/${deviceGate.getTotalLocks()} conditions met`);
}

// Event handlers with clear messaging
deviceGate.on('unlocked', () => {
  console.log('\n🎉 DEVICE ACTIVATED!');
  console.log('✅ All conditions met - device is now operational');
  displayStatus();
});

deviceGate.on('locked', () => {
  console.log('\n⚠️  DEVICE PAUSED');
  console.log('❌ One or more conditions failed - device stopped for safety');
  displayStatus();
});

// Show initial state
console.log('\n⏰ INITIAL STATE:');
displayStatus();

// Simulate conditions changing over time
console.log('\n🔄 Starting condition monitoring...\n');

// Network connects once and stays connected (unlock once)
setTimeout(() => {
  console.log('🌐 Network connection established');
  deviceGate.setLock('network', false);
  displayStatus();
}, 2000);

// Safety check passes once and stays safe (unlock once)
setTimeout(() => {
  console.log('🛡️  Safety systems verified');
  deviceGate.setLock('safety', false);
  displayStatus();
}, 4000);

// Power starts stable (unlock once)
setTimeout(() => {
  console.log('⚡ Power supply stabilized');
  deviceGate.setLock('power', false);
  displayStatus();
}, 6000);

// Power becomes unstable (lock again) - dynamic condition
setTimeout(() => {
  console.log('⚠️  Power fluctuation detected!');
  deviceGate.setLock('power', true);
  displayStatus();
}, 10000);

// Power stabilizes again (unlock again)
setTimeout(() => {
  console.log('⚡ Power supply restored');
  deviceGate.setLock('power', false);
  displayStatus();
}, 14000);

// Another power issue (lock again)
setTimeout(() => {
  console.log('⚠️  Power spike detected!');
  deviceGate.setLock('power', true);
  displayStatus();
}, 18000);

// Final power restoration (unlock again)
setTimeout(() => {
  console.log('⚡ Power fully stabilized');
  deviceGate.setLock('power', false);
  displayStatus();
}, 22000);

// Summary
setTimeout(() => {
  console.log('\n━'.repeat(60));
  console.log('📋 DEMO SUMMARY:');
  console.log('━'.repeat(60));
  console.log('• Network: Connected once, stayed connected');
  console.log('• Safety: Verified once, stayed safe');
  console.log('• Power: Fluctuated multiple times (dynamic condition)');
  console.log('');
  console.log('🔑 KEY INSIGHT:');
  console.log('The gate only unlocks when ALL conditions are met.');
  console.log('It immediately locks again when ANY condition fails.');
  console.log('Perfect for systems that need all conditions satisfied!');
  console.log('━'.repeat(60));
}, 24000);