feat: add update_backpressure_value method to BackpressureHandler class

Co-authored-by: aider (openrouter/openai/o3-mini-high) <aider@aider.chat>

amqp/adapter/backpressure_handler.py

@@ -161,6 +161,40 @@ class BackpressureHandler:
         """Update the last data message time"""
         self.last_data_message_time = time.time()
 
+    async def update_backpressure_value(self, current: int, maximum: int):
+        """
+        Update the current backpressure value and check for overload conditions.
+        This method is called by the AMQService.backpressure() method to update
+        the current parallel executions count and check for overload conditions.
+        
+        Args:
+            current: Current value of the backpressure metric
+            maximum: Maximum value of the backpressure metric
+        """
+        logging_info(
+            "Backpressure: Updating backpressure value, current=%s, maximum=%s",
+            current,
+            maximum
+        )
+        
+        # Update the current parallel executions count
+        self.update_parallel_executions(current)
+        
+        # Update the last data message time to indicate activity
+        self.update_last_data_message_time()
+        
+        # Check for overload conditions
+        await self.check_overload_condition()
+        
+        # If maximum has changed, update the parallel workers threshold
+        if maximum != self.parallel_workers and maximum > 0:
+            logging_info(
+                "Backpressure: Updating maximum parallel workers from %s to %s",
+                self.parallel_workers,
+                maximum
+            )
+            self.parallel_workers = maximum
+
     def start_backpressure_monitor(self) -> Thread:
         # Check if CPU monitoring is enabled in configuration
         cpu_monitoring_enabled = self.config.backpressure.cpu_monitoring_enabled