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-rw-r--r--tests/test_util_cache.lua27
-rw-r--r--util/cache.lua12
2 files changed, 38 insertions, 1 deletions
diff --git a/tests/test_util_cache.lua b/tests/test_util_cache.lua
index 72cb5a85..ecdc2dc0 100644
--- a/tests/test_util_cache.lua
+++ b/tests/test_util_cache.lua
@@ -1,21 +1,44 @@
-
function new(new)
local c = new(5);
+ local function expect_kv(key, value, actual_key, actual_value)
+ assert_equal(key, actual_key, "key incorrect");
+ assert_equal(value, actual_value, "value incorrect");
+ end
+
+ expect_kv(nil, nil, c:head());
+ expect_kv(nil, nil, c:tail());
+
assert_equal(c:count(), 0);
c:set("one", 1)
assert_equal(c:count(), 1);
+ expect_kv("one", 1, c:head());
+ expect_kv("one", 1, c:tail());
+
c:set("two", 2)
+ expect_kv("two", 2, c:head());
+ expect_kv("one", 1, c:tail());
+
c:set("three", 3)
+ expect_kv("three", 3, c:head());
+ expect_kv("one", 1, c:tail());
+
c:set("four", 4)
c:set("five", 5);
assert_equal(c:count(), 5);
+ expect_kv("five", 5, c:head());
+ expect_kv("one", 1, c:tail());
c:set("foo", nil);
assert_equal(c:count(), 5);
+ expect_kv("five", 5, c:head());
+ expect_kv("one", 1, c:tail());
assert_equal(c:get("one"), 1);
+ expect_kv("five", 5, c:head());
+ expect_kv("one", 1, c:tail());
+
assert_equal(c:get("two"), 2);
assert_equal(c:get("three"), 3);
assert_equal(c:get("four"), 4);
@@ -26,6 +49,8 @@ function new(new)
c:set("six", 6);
assert_equal(c:count(), 5);
+ expect_kv("six", 6, c:head());
+ expect_kv("two", 2, c:tail());
assert_equal(c:get("one"), nil);
assert_equal(c:get("two"), 2);
diff --git a/util/cache.lua b/util/cache.lua
index d3639b3f..e53bf4bf 100644
--- a/util/cache.lua
+++ b/util/cache.lua
@@ -92,6 +92,18 @@ function cache_methods:count()
return self._count;
end
+function cache_methods:head()
+ local head = self._head;
+ if not head then return nil, nil; end
+ return head.key, head.value;
+end
+
+function cache_methods:tail()
+ local tail = self._tail;
+ if not tail then return nil, nil; end
+ return tail.key, tail.value;
+end
+
local function new(size, on_evict)
size = assert(tonumber(size), "cache size must be a number");
size = math.floor(size);