Function test_persistent_storage_flush_mode

tests/test_persistent_store.py:250–534

Persistent Storage Forced Write Testing.

(tmpdir)

def test_persistent_storage_flush_mode(tmpdir):
    """Persistent Storage Forced Write Testing."""
    namespace = "abc"
    # Create ourselves an attachment object
    pc = PersistentStore(
        namespace=namespace, path=str(tmpdir), mode=PersistentStoreMode.FLUSH
    )

    # Reference path
    path = os.path.join(str(tmpdir), namespace)

    assert pc.size() == 0
    assert list(pc.files()) == []

    # Key is not set yet
    assert pc.get("key") is None
    assert len(pc.keys()) == 0
    assert "key" not in pc

    # Verify our data is set
    assert pc.set("key", "value")
    assert len(pc.keys()) == 1
    assert "key" in list(pc.keys())

    assert pc.size() > 0
    assert len(pc.files()) == 1

    # Second call uses Lazy cache
    # Just our cache file
    assert len(pc.files()) == 1

    # Setting the same value again uses a lazy mode and
    # bypasses all of the write overhead
    assert pc.set("key", "value")

    path_content = os.listdir(path)
    # var, cache.psdata, and tmp
    assert len(path_content) == 3

    # Assignments (causes another disk write)
    pc["key"] = "value2"

    # Setting the same value and explictly marking the field as not being
    # perisistent
    pc.set("key-xx", "abc123", persistent=False)
    # Changing it's value doesn't alter the persistent flag
    pc["key-xx"] = "def678"
    # Setting it twice
    pc["key-xx"] = "def678"

    # Our retrievals
    assert pc["key-xx"] == "def678"
    assert pc.get("key-xx") == "def678"

    # But on the destruction of our object, it is not available again
    del pc
    # Create ourselves an attachment object
    pc = PersistentStore(