when one application runs agiain, then it shows alert notification - already running

Author: PayalLakra

app.py

@@ -19,6 +19,7 @@
 connection_thread = None
 ble_devices = []
 stream_active = False
+running_apps = {}  # Dictionary to track running apps
 
 def run_async(coro):
     def wrapper(*args, **kwargs):
@@ -87,19 +88,33 @@ def launch_application():
     if not app_name:
         return jsonify({'status': 'error', 'message': 'No application specified'}), 400
 
+    # Check if app is already running
+    if app_name in running_apps and running_apps[app_name].poll() is None:
+        return jsonify({'status': 'error', 'message': f'{app_name} is already running','code': 'ALREADY_RUNNING'}), 400
+    
     try:
-        # Here we'll use subprocess to launch the application script
         import subprocess
         import sys
 
-        python_exec = sys.executable       # Determine the correct Python executable
-        subprocess.Popen([python_exec, f"{app_name}.py"])   # Launch the application script in a separate process
+        python_exec = sys.executable
+        process = subprocess.Popen([python_exec, f"{app_name}.py"])
+        running_apps[app_name] = process
 
         return jsonify({'status': 'success', 'message': f'Launched {app_name}'})
     except Exception as e:
         logging.error(f"Error launching {app_name}: {str(e)}")
         return jsonify({'status': 'error', 'message': str(e)}), 500
 
+@app.route('/check_app_status/<app_name>')
+def check_app_status(app_name):
+    if app_name in running_apps:
+        if running_apps[app_name].poll() is None:  # Still running
+            return jsonify({'status': 'running'})
+        else:  # Process has terminated
+            del running_apps[app_name]
+            return jsonify({'status': 'not_running'})
+    return jsonify({'status': 'not_running'})
+
 @app.route('/connect', methods=['POST'])
 def connect_device():
     global connection_manager, connection_thread, stream_active

templates/index.html

@@ -154,11 +154,26 @@ <h3 class="text-lg font-semibold text-gray-800 dark:text-gray-200 mb-1">${app.ti
                 </div>
             `;
 
-            card.addEventListener('click', () => {
+            card.addEventListener('click', async () => {
                 if (!isConnected) {
                     showAlert('Please start LSL Stream first by any protocol (USB/WIFI/BLE)');
                     return;
                 }
+                
+                // First checking if app is already running
+                try {
+                    const response = await fetch(`/check_app_status/${app.script}`);
+                    const data = await response.json();
+                    
+                    if (data.status === 'running') {
+                        showAlert(`${app.title} is already running!`);
+                        return;
+                    }
+                } catch (error) {
+                    console.error('Error checking app status:', error);
+                }
+                
+                // If not running, launch the app
                 launchApplication(app.script);
             });
 
@@ -523,7 +538,8 @@ <h3 class="text-lg font-semibold text-gray-800 dark:text-gray-200 mb-1">${app.ti
             .then(response => response.json())
             .then(data => {
                 if (data.status === 'success') {
-                    // showStatus(`Launched ${appName} application`, 'fa-check-circle', 'text-green-500');
+                } else if (data.code === 'ALREADY_RUNNING') {
+                    showAlert(data.message);
                 } else {
                     showAlert(`Failed to launch ${appName}: ${data.message}`);
                 }