fix expire cache

CMakeLists.txt

@@ -201,8 +201,10 @@ if(SLED_BUILD_TESTS)
   sled_add_test(NAME sled_ioc_test SRCS src/sled/ioc/ioc_test.cc)
   sled_add_test(NAME sled_inja_test SRCS src/sled/nonstd/inja_test.cc)
   sled_add_test(NAME sled_fsm_test SRCS src/sled/nonstd/fsm_test.cc)
-  sled_add_test(NAME sled_cache_test SRCS src/sled/cache/lru_cache_test.cc
-                src/sled/cache/fifo_cache_test.cc)
+  sled_add_test(NAME sled_timestamp_test SRCS src/sled/units/timestamp_test.cc)
+  sled_add_test(
+    NAME sled_cache_test SRCS src/sled/cache/lru_cache_test.cc
+    src/sled/cache/fifo_cache_test.cc src/sled/cache/expire_cache_test.cc)
 endif(SLED_BUILD_TESTS)
 
 if(SLED_BUILD_FUZZ)

src/sled/cache/expire_cache.h

@@ -9,6 +9,11 @@ namespace sled {
 template<typename TKey, typename TValue>
 class ExpireCache : public AbstractCache<TKey, TValue, ExpireCachePolicy<TKey>> {
 public:
+    ExpireCache(const TimeDelta &expire_time)
+    {
+        this->policy_.insert(std::make_shared<ExpireCachePolicy<TKey>>(expire_time));
+    }
+
     ~ExpireCache() override = default;
 };
 }// namespace sled

src/sled/cache/expire_cache_test.cc

@@ -0,0 +1,18 @@
+#include <sled/cache/expire_cache.h>
+#include <sled/system/thread.h>
+
+TEST_SUITE("Expire Cache")
+{
+    TEST_CASE("Remove Expired Key")
+    {
+        sled::ExpireCache<int, int> expire_cache(sled::TimeDelta::Millis(25));
+        expire_cache.Add(1, 1);
+        REQUIRE(expire_cache.Has(1));
+        CHECK_EQ(*expire_cache.Get(1), 1);
+
+        sled::Thread::SleepMs(30);
+        CHECK_FALSE(expire_cache.Has(1));
+        CHECK(expire_cache.empty());
+        CHECK_EQ(expire_cache.Get(1), nullptr);
+    }
+}

src/sled/cache/policy/expire_cache_policy.h

@@ -3,7 +3,6 @@
 
 #pragma once
 #include "abstract_cache_policy.h"
-#include "sled/time_utils.h"
 #include "sled/units/timestamp.h"
 #include <map>
 
@@ -12,12 +11,14 @@ namespace sled {
 template<typename TKey>
 class ExpireCachePolicy : public AbstractCachePolicy<TKey> {
 public:
+    ExpireCachePolicy(const TimeDelta &expire_time) : expire_time_(expire_time) {}
+
     ~ExpireCachePolicy() override = default;
 
     void OnAdd(const TKey &key) override
     {
-        Timestamp now = Timestamp::Nanos(TimeNanos());
-        auto iter     = key_index_.insert(std::make_pair(now, key));
+        Timestamp cur_expire_time = Timestamp::Now() + expire_time_;
+        auto iter                 = key_index_.insert(std::make_pair(cur_expire_time, key));
         keys_[key]                = iter;
     }
 
@@ -44,8 +45,7 @@ public:
     void OnReplace(std::set<TKey> &elems_to_remove) override
     {
         auto iter = key_index_.begin();
-        Timestamp now = Timestamp::Nanos(TimeNanos());
-        while (iter != key_index_.end() && iter->first < now) {
+        while (iter != key_index_.end() && iter->first.IsExpired()) {
             elems_to_remove.insert(iter->second);
             ++iter;
         }
@@ -54,15 +54,11 @@ public:
     bool IsValid(const TKey &key) override
     {
         auto iter = keys_.find(key);
-        if (iter != keys_.end()) {
-            return iter->second->first + expire_time_ > Timestamp::Nanos(TimeNanos());
-        } else {
-            return false;
-        }
+        return iter != keys_.end() && !iter->second->first.IsExpired();
     }
 
 private:
-    TimeDelta expire_time_;
+    const TimeDelta expire_time_;
     std::multimap<Timestamp, TKey> key_index_;
     std::map<TKey, typename std::multimap<Timestamp, TKey>::iterator> keys_;
 };

src/sled/cache/policy/fifo_cache_policy.h

@@ -41,9 +41,18 @@ public:
         BaseClass::OnClear();
     }
 
-    void OnReplace(std::set<TKey> &key) override
+    void OnReplace(std::set<TKey> &elems_to_remove) override
     {
-        // do nothing
+        BaseClass::OnReplace(elems_to_remove);
+
+        if (keys_.size() <= size_) { return; }
+        std::size_t diff  = keys_.size() - size_;
+        std::size_t index = 0;
+        auto iter         = keys_.begin();
+        while (index++ < diff) {
+            elems_to_remove.insert(*iter);
+            if (iter != keys_.end()) { ++iter; }
+        }
     }
 
     bool IsValid(const TKey &key) override { return BaseClass::IsValid(key); }

src/sled/units/time_delta.h

@@ -27,18 +27,25 @@ public:
     static constexpr TimeDelta Seconds(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromFraction(1000000, value);
+        return FromFraction(1000000000, value);
     }
 
     template<typename T>
     static constexpr TimeDelta Millis(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromFraction(1000, value);
+        return FromFraction(1000000, value);
     }
 
     template<typename T>
     static constexpr TimeDelta Micros(T value)
+    {
+        static_assert(std::is_arithmetic<T>::value, "");
+        return FromFraction(1000, value);
+    }
+
+    template<typename T>
+    static constexpr TimeDelta Nanos(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
         return FromValue(value);
@@ -47,7 +54,7 @@ public:
     template<typename Clock, typename Duration>
     inline TimeDelta(const std::chrono::duration<Clock, Duration> &duration)
     {
-        *this = FromValue(std::chrono::duration_cast<std::chrono::microseconds>(duration).count());
+        *this = FromValue(std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count());
     }
 
     TimeDelta() = delete;
@@ -55,32 +62,34 @@ public:
     template<typename T = int64_t>
     constexpr T seconds() const
     {
-        return ToFraction<1000000, T>();
+        return ToFraction<1000000000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T ms() const
     {
-        return ToFraction<1000, T>();
+        return ToFraction<1000000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T us() const
     {
-        return ToValue<T>();
+        return ToFraction<1000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T ns() const
     {
-        return ToMultiple<1000, T>();
+        return ToValue<T>();
     }
 
-    constexpr int64_t seconds_or(int64_t fallback_value) const { return ToFractionOr<1000000>(fallback_value); }
+    constexpr int64_t seconds_or(int64_t fallback_value) const { return ToFractionOr<1000000000>(fallback_value); }
 
-    constexpr int64_t ms_or(int64_t fallback_value) const { return ToFractionOr<1000>(fallback_value); }
+    constexpr int64_t ms_or(int64_t fallback_value) const { return ToFractionOr<1000000>(fallback_value); }
 
-    constexpr int64_t us_or(int64_t fallback_value) const { return ToValueOr(fallback_value); }
+    constexpr int64_t us_or(int64_t fallback_value) const { return ToFractionOr<1000>(fallback_value); }
+
+    constexpr int64_t ns_or(int64_t fallback_value) const { return ToValueOr(fallback_value); }
 
     constexpr TimeDelta Abs() const { return us() < 0 ? TimeDelta::Micros(-us()) : *this; }
 

src/sled/units/timestamp.h

@@ -7,6 +7,7 @@
 #pragma once
 #ifndef SLED_UNITS_TIMESTAMP_H
 #define SLED_UNITS_TIMESTAMP_H
+#include "sled/time_utils.h"
 #include "sled/units/time_delta.h"
 #include "sled/units/unit_base.h"
 
@@ -14,65 +15,71 @@ namespace sled {
 
 class Timestamp final : public detail::UnitBase<Timestamp> {
 public:
+    static Timestamp Now() { return Timestamp::Nanos(TimeNanos()); }
+
     template<typename T>
     static constexpr Timestamp Seconds(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromFraction(1000000, value);
+        return FromFraction(1000000000, value);
     }
 
     template<typename T>
     static constexpr Timestamp Millis(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromFraction(1000, value);
+        return FromFraction(1000000, value);
     }
 
     template<typename T>
     static constexpr Timestamp Micros(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromValue(value);
+        return FromFraction(1000, value);
     }
 
     template<typename T>
     static constexpr Timestamp Nanos(T value)
     {
         static_assert(std::is_arithmetic<T>::value, "");
-        return FromValue(value * 1000LL);
+        return FromValue(value);
     }
 
     Timestamp() = delete;
 
+    bool IsExpired() const { return *this < Now(); }
+
     template<typename T = int64_t>
     constexpr T seconds() const
     {
-        return ToFraction<1000000, T>();
+        return ToFraction<1000000000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T ms() const
     {
-        return ToFraction<1000, T>();
+        return ToFraction<1000000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T us() const
     {
-        return ToValue<T>();
+        return ToFraction<1000, T>();
     }
 
     template<typename T = int64_t>
     constexpr T ns() const
     {
-        return ToMultiple<1000, T>();
+        return ToValue<T>();
     }
 
-    constexpr int64_t seconds_or(int64_t fallback_value) const { return ToFractionOr<1000000>(fallback_value); }
+    constexpr int64_t seconds_or(int64_t fallback_value) const { return ToFractionOr<1000000000>(fallback_value); }
 
-    constexpr int64_t ms_or(int64_t fallback_value) const { return ToFractionOr<1000>(fallback_value); }
+    constexpr int64_t ms_or(int64_t fallback_value) const { return ToFractionOr<1000000>(fallback_value); }
 
-    constexpr int64_t us_or(int64_t fallback_value) const { return ToValueOr(fallback_value); }
+    constexpr int64_t us_or(int64_t fallback_value) const { return ToFractionOr<1000>(fallback_value); }
+
+    constexpr int64_t ns_or(int64_t fallback_value) const { return ToValueOr(fallback_value); }
 
     Timestamp operator+(const TimeDelta delta) const
     {
@@ -81,7 +88,7 @@ public:
         } else if (IsMinusInfinity() || delta.IsMinusInfinity()) {
             return MinusInfinity();
         }
-        return Timestamp::Micros(us() - delta.us());
+        return Timestamp::Nanos(ns() + delta.ns());
     }
 
     Timestamp operator-(const TimeDelta delta) const
@@ -91,7 +98,7 @@ public:
         } else if (IsMinusInfinity() || delta.IsPlusInfinity()) {
             return MinusInfinity();
         }
-        return Timestamp::Micros(us() - delta.us());
+        return Timestamp::Nanos(ns() - delta.ns());
     }
 
     TimeDelta operator-(const Timestamp other) const

src/sled/units/timestamp_test.cc

@@ -0,0 +1,21 @@
+#include <sled/units/timestamp.h>
+
+TEST_SUITE("Timestamp")
+{
+    TEST_CASE("ToString")
+    {
+        CHECK_EQ(sled::ToString(sled::Timestamp::PlusInfinity()), "+inf ms");
+        CHECK_EQ(sled::ToString(sled::Timestamp::MinusInfinity()), "-inf ms");
+        CHECK_EQ(sled::ToString(sled::Timestamp::Micros(1)), "1 us");
+        CHECK_EQ(sled::ToString(sled::Timestamp::Millis(1)), "1 ms");
+        CHECK_EQ(sled::ToString(sled::Timestamp::Seconds(1)), "1 s");
+    }
+
+    TEST_CASE("IsExpired")
+    {
+        auto passed = sled::Timestamp::Now() - sled::TimeDelta::Millis(1);
+        CHECK(passed.IsExpired());
+        auto future = sled::Timestamp::Now() + sled::TimeDelta::Millis(1);
+        CHECK_FALSE(future.IsExpired());
+    }
+}