You are an expert in Python. Your task is to implement a deterministic cache replacement policy in Python without any randomness. You can only reference the attributes provided below. You have read-only access to these attributes and no access to any functions.
[Begin of accessible attributes]
An "object" represents the unit of a request, such as inserting an object into the cache or retrieving an object from the cache. Each object `obj` provides the following **read-only** attributes that you can reference:
- `obj.key` (str): A string that uniquely identifies the object.
- `obj.size` (int): A positive integer representing the size of the object in bytes.

You can also reference the following **read-only** attributes provided by a cache snapshots `cache_snapshot`:
- `cache_snapshot.cache` (dict): A dictionary containing the cached objects, where the keys are the objects' keys, and the values are the corresponding objects themselves.
- `cache_snapshot.size` (int): A non-negative integer representing the current total size of the cache in bytes.
- `cache_snapshot.capacity` (int): A positive integer representing the maximum allowed size of the cache in bytes.
- `cache_snapshot.access_count` (int): The current total number of cache accesses. You can also use this to represent current time.
- `cache_snapshot.hit_count` (int): The current total number of cache hits.
- `cache_snapshot.miss_count` (int): The current total number of cache misses.
[End of accessible attributes]

The cache replacement policy you need to implement is described below:
[Begin of cache replacement policy]
[[design]]
[End of cache replacement policy]

Implement this policy using the Python code framework below. Your implementation must strictly follow the comments in this Python code framework.
[Begin of Python code framework]
```python
# Import anything you need below. You must not use any randomness. For example, you cannot `import random`. Also, you cannot use any function in `numpy` that uses randomness, such as the functions in `numpy.random`.

# Put tunable constant parameters below

# Put the metadata specifically maintained by the policy below. [[metadata]]

def evict(cache_snapshot, obj):
    '''
    This function defines how the policy chooses the eviction victim.
    [[evict]]
    - Args:
        - `cache_snapshot`: A snapshot of the current cache state.
        - `obj`: The new object that needs to be inserted into the cache.
    - Return:
        - `candid_obj_key`: The key of the cached object that will be evicted to make room for `obj`.
    '''
    candid_obj_key = None
    # Your code below
    
    return candid_obj_key

def update_after_hit(cache_snapshot, obj):
    '''
    This function defines how the policy update the metadata it maintains immediately after a cache hit.
    [[update_after_hit]]
    - Args:
        - `cache_snapshot`: A snapshot of the current cache state.
        - `obj`: The object accessed during the cache hit.
    - Return: `None`
    '''
    # Your code below

def update_after_insert(cache_snapshot, obj):
    '''
    This function defines how the policy updates the metadata it maintains immediately after inserting a new object into the cache.
    [[update_after_insert]]
    - Args:
        - `cache_snapshot`: A snapshot of the current cache state.
        - `obj`: The object that was just inserted into the cache.
    - Return: `None`
    '''
    # Your code below

def update_after_evict(cache_snapshot, obj, evicted_obj):
    '''
    This function defines how the policy updates the metadata it maintains immediately after evicting the victim.
    [[update_after_evict]]
    - Args:
        - `cache_snapshot`: A snapshot of the current cache state.
        - `obj`: The object to be inserted into the cache.
        - `evicted_obj`: The object that was just evicted from the cache.
    - Return: `None`
    '''
    # Your code below
```
[End of code framework]

You **must not** alter the provided code framework. Also, keep the two comments "# Put tunable constant parameters below" and "# Put the metadata specifically maintained by the policy below" unchanged. Wrap your code with "```python" and "```" and include nothing else in your answer.

```python
<your code here>
```