Revert "LatestValueCache: Expose keys for which messages have been received (frequenz-floss#425)"

This reverts commit 6f24b25, reversing
changes made to 3edcb49.

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/channels/_latest_value_cache.py

@@ -44,7 +44,6 @@
 
 import asyncio
 import typing
-from collections.abc import Set
 
 from ._receiver import Receiver
 
@@ -146,13 +145,6 @@ def unique_id(self) -> str:
         """The unique identifier of this instance."""
         return self._unique_id
 
-    def keys(self) -> Set[HashableT]:
-        """Return the set of keys for which values have been received.
-
-        If no key function is provided, this will return an empty set.
-        """
-        return self._latest_value_by_key.keys()
-
     def get(self, key: HashableT | Sentinel = NO_KEY) -> T_co:
         """Return the latest value that has been received.
 

tests/test_latest_value_cache_integration.py

@@ -44,8 +44,6 @@ async def test_latest_value_cache() -> None:
 
     assert cache.get() == 19
 
-    assert cache.keys() == set()
-
 
 @pytest.mark.integration
 async def test_latest_value_cache_key() -> None:
@@ -61,8 +59,6 @@ async def test_latest_value_cache_key() -> None:
     with pytest.raises(ValueError, match="No value received for key: 0"):
         cache.get(0)
 
-    assert cache.keys() == set()
-
     await sender.send((5, "a"))
     await sender.send((6, "b"))
     await sender.send((5, "c"))
@@ -77,8 +73,6 @@ async def test_latest_value_cache_key() -> None:
     assert cache.get(5) == (5, "c")
     assert cache.get(6) == (6, "b")
 
-    assert cache.keys() == {5, 6}
-
     with pytest.raises(ValueError, match="No value received for key: 7"):
         cache.get(7)
 
@@ -98,5 +92,3 @@ async def test_latest_value_cache_key() -> None:
     await asyncio.sleep(0)
 
     assert cache.get(6) == (6, "g")
-
-    assert cache.keys() == {5, 6, 12}