You are working on a chat application and need to implement functionality for listening to incoming messages. You have a `ChatClient` class with a `start_listen_messages` method that takes a function `message_received` as an argument. The `message_received` function is called whenever a new message is received.

You need to implement the `start_listen_messages` method to set the provided `message_received` function as the callback for message reception. Whenever a message is received, the `message_received` function should be called with the received message as an argument.

Your task is to complete the `start_listen_messages` method to achieve the desired functionality.

Note:
- The `ChatClient` class has already been partially implemented with the `__init__` method that initializes the class attributes.

Signature:
```
def start_listen_messages(self, message_received):
    pass
```

Example:
```python
def message_received(message):
    print(f"Received message: {message}")

client = ChatClient()
client.start_listen_messages(message_received)
```

Output:
```
Received message: Hello, how are you?
```
user
Sure, I can help you implement the `start_listen_messages` method in Python. Here's a basic example using the `threading` module to simulate incoming messages:

```python
import threading

class ChatClient:
    def __init__(self):
        self.is_running = False
        self.message_callback = None

    def start_listen_messages(self, callback):
        if self.is_running:
            print("Listening is already started.")
            return

        self.message_callback = callback
        self.is_running = True

        # Simulate incoming messages
        threading.Thread(target=self.simulate_messages).start()

    def simulate_messages(self):
        while self.is_running:
            message = "Hello, how are you?"
            self.message_callback(message)
            time.sleep(1)
```

In this code, the `ChartClient` class has a `message_callback` attribute that stores a reference to the callback function. The `start_listen_messages` method validates that listening is not already started, sets the callback, and starts a simulated message thread.

The `simulate_messages` method is a simple example of how to create a loop that sends simulated messages. You can replace it with your actual implementation of receiving messages.

The `start_listen_messages` method uses the `threading.Thread` class to create a new thread for receiving messages. This is a basic approach, and depending on your use case, you may want to use a different approach, such as `asyncio` or `tornado`, for more efficient and scalable message handling.
assistant
You are working on a chat application and need to implement functionality for listening to incoming messages. You have a `ChatClient` class with a `start_listen_messages` method that takes a function `message_received` as an argument. The `message_received` function is called whenever a new message is received.

You need to implement the `start_listen_messages` method to set the provided `message_received` function as the callback for message reception. Whenever a message is received, the `message_received` function should be called with the received message as an argument.

Your task is to complete the `start_listen_messages` method to achieve the desired functionality.

Note:
- The `ChatClient` class has already been partially implemented with the `__init__` method that initializes the class attributes.

Signature:
```
def start_listen_messages(self, message_received):
    pass
```

Example:
```python
def message_received(message):
    print(f"Received message: {message}")

client = ChatClient()
client.start_listen_messages(message_received)
```

Output:
```
Received message: Hello, how are you?
```
user
In order to implement the `start_listen_messages` method, you would need some way to listen for incoming messages, like a connection to a server or a message queue. However, since the given `ChatClient` class is only partially implemented, I'll provide a simplified example using Python's built-in `threading` module to simulate receiving messages.

In this example, I'll assume that the `ChatClient` class has a `receive_message` method that blocks until a message is received, and then returns the received message. The `start_listen_messages` method will start a new thread that continuously calls `receive_message` and passes the received messages to the provided `message_received` function.

Here's the updated `ChatClient` class:

```python
import threading

class ChatClient:
    def __init__(self):
        self._listen_thread = None

    def receive_message(self):
        # This method should be implemented to block until a message is received,
        # and then return the received message.
        # For this example, we'll just return a static message.
        return "Hello, how are you?"

    def start_listen_messages(self, message_received):
        def listen_loop():
            while True:
                message = self.receive_message()
                message_received(message)

        self._listen_thread = threading.Thread(target=listen_loop)
        self._listen_thread.start()
```

Now, when you call `start_listen_messages` with a function like in your example, the received messages will be passed to that function:

```python
def message_received(message):
    print(f"Received message: {message}")

client = ChatClient()
client.start_listen_messages(message_received)
```

This will output:

```
Received message: Hello, how are you?
```
assistant