From 34f0461a68b3a55399b69f7f7392c64a3ff3735a Mon Sep 17 00:00:00 2001
From: tqcq <99722391+tqcq@users.noreply.github.com>
Date: Wed, 14 Aug 2024 21:40:13 +0800
Subject: [PATCH] feat udpate config to configuration

---
 CMakeLists.txt                                |   6 +-
 .../config/{config.cc => configuration.cc}    |  33 ++---
 .../base/config/{config.h => configuration.h} |  20 +--
 ...le_config.cc => ini_file_configuration.cc} |  28 ++--
 ...file_config.h => ini_file_configuration.h} |  10 +-
 ...test.cc => ini_file_configuration_test.cc} |  11 +-
 tile/base/config/layered_config.cc            | 129 -----------------
 tile/base/config/layered_config.h             |  57 --------
 tile/base/config/layered_configuration.cc     | 133 ++++++++++++++++++
 tile/base/config/layered_configuration.h      |  57 ++++++++
 tile/base/configuration.h                     |  11 ++
 tile/tile.h                                   |   6 +-
 12 files changed, 258 insertions(+), 243 deletions(-)
 rename tile/base/config/{config.cc => configuration.cc} (75%)
 rename tile/base/config/{config.h => configuration.h} (89%)
 rename tile/base/config/{ini_file_config.cc => ini_file_configuration.cc} (77%)
 rename tile/base/config/{ini_file_config.h => ini_file_configuration.h} (81%)
 rename tile/base/config/{ini_file_config_test.cc => ini_file_configuration_test.cc} (72%)
 delete mode 100644 tile/base/config/layered_config.cc
 delete mode 100644 tile/base/config/layered_config.h
 create mode 100644 tile/base/config/layered_configuration.cc
 create mode 100644 tile/base/config/layered_configuration.h
 create mode 100644 tile/base/configuration.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7631cc6..bbf65c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -207,9 +207,9 @@ set(TILE_SRCS
     "tile/rpc/protocol/http/buffer_io.cc"
     "tile/rpc/protocol/message.cc"
     # "tile/rpc/server.cc"
-    "tile/base/config/config.cc"
-    "tile/base/config/ini_file_config.cc"
-    "tile/base/config/layered_config.cc"
+    "tile/base/config/configuration.cc"
+    "tile/base/config/ini_file_configuration.cc"
+    "tile/base/config/layered_configuration.cc"
 )
 
 if((NOT TILE_HAVE_GETIFADDRS) OR (NOT TILE_HAVE_FREEIFADDRS))
diff --git a/tile/base/config/config.cc b/tile/base/config/configuration.cc
similarity index 75%
rename from tile/base/config/config.cc
rename to tile/base/config/configuration.cc
index e56cf21..482a93b 100644
--- a/tile/base/config/config.cc
+++ b/tile/base/config/configuration.cc
@@ -1,26 +1,26 @@
-#include "tile/base/config/config.h"
+#include "tile/base/config/configuration.h"
 #include "tile/base/thread/unique_lock.h"
 
 namespace tile {
 namespace util {
-bool Config::Has(const Slice &key) const {
+bool Configuration::Has(const Slice &key) const {
   UniqueLock<tile::Mutex> lock(mutex_);
   std::string value;
   return GetRaw(key, &value);
 }
 
-void Config::Remove(const Slice &key) {}
+void Configuration::Remove(const Slice &key) {}
 
-void Config::EnableEvents(bool enable) { events_enabled_ = enable; }
-bool Config::EventsEnabled() const { return events_enabled_; }
+void Configuration::EnableEvents(bool enable) { events_enabled_ = enable; }
+bool Configuration::EventsEnabled() const { return events_enabled_; }
 
-Config::Keys Config::keys(const Slice &root) const {
+Configuration::Keys Configuration::keys(const Slice &root) const {
   UniqueLock<tile::Mutex> lock(mutex_);
   return Enumerate(root);
 }
 
 #define TILE_DEFINE_CONFIG_GETTER(type, name)                                  \
-  std::optional<type> Config::Get##name(const Slice &key) const {              \
+  std::optional<type> Configuration::Get##name(const Slice &key) const {       \
     std::string value;                                                         \
     if (GetRaw(key, &value)) {                                                 \
       auto opt = TryParseTraits<type>::TryParse(value);                        \
@@ -33,7 +33,7 @@ Config::Keys Config::keys(const Slice &root) const {
       return std::nullopt;                                                     \
     }                                                                          \
   }                                                                            \
-  type Config::Get##name(const Slice &key, type default_value) const {         \
+  type Configuration::Get##name(const Slice &key, type default_value) const {  \
     auto opt = Get##name(key);                                                 \
     if (opt.has_value()) {                                                     \
       return *opt;                                                             \
@@ -43,11 +43,11 @@ Config::Keys Config::keys(const Slice &root) const {
   }
 
 #define TILE_DEFINE_CONFIG_SETTER(type, name)                                  \
-  void Config::Set##name(const Slice &key, type value) {                       \
+  void Configuration::Set##name(const Slice &key, type value) {                \
     SetRawWithEvent(key, Format("{}", value));                                 \
   }
 
-std::optional<std::string> Config::GetString(const Slice &key) const {
+std::optional<std::string> Configuration::GetString(const Slice &key) const {
   std::string value;
   UniqueLock<tile::Mutex> lock(mutex_);
   if (GetRaw(key, &value)) {
@@ -57,16 +57,16 @@ std::optional<std::string> Config::GetString(const Slice &key) const {
   }
 }
 
-std::string Config::GetString(const Slice &key,
-                              std::string default_value) const {
+std::string Configuration::GetString(const Slice &key,
+                                     std::string default_value) const {
   auto opt = GetString(key);
   return opt.has_value() ? *opt : default_value;
 }
 
-void Config::SetString(const Slice &key, const std::string &value) {
+void Configuration::SetString(const Slice &key, const std::string &value) {
   SetRawWithEvent(key, value);
 }
-void Config::SetBool(const Slice &key, bool value) {
+void Configuration::SetBool(const Slice &key, bool value) {
   SetRawWithEvent(key, value ? "true" : "false");
 }
 
@@ -91,7 +91,8 @@ TILE_DEFINE_CONFIG_SETTER(uint32_t, UInt32)
 TILE_DEFINE_CONFIG_SETTER(uint64_t, UInt64)
 TILE_DEFINE_CONFIG_SETTER(double, Double)
 
-void Config::SetRawWithEvent(const Slice &key, const std::string &value) {
+void Configuration::SetRawWithEvent(const Slice &key,
+                                    const std::string &value) {
   if (events_enabled_) {
     OnChanging(key, value);
   }
@@ -106,7 +107,7 @@ void Config::SetRawWithEvent(const Slice &key, const std::string &value) {
   }
 }
 
-Config::~Config() {}
+Configuration::~Configuration() {}
 
 } // namespace util
 
diff --git a/tile/base/config/config.h b/tile/base/config/configuration.h
similarity index 89%
rename from tile/base/config/config.h
rename to tile/base/config/configuration.h
index 32e3204..2365340 100644
--- a/tile/base/config/config.h
+++ b/tile/base/config/configuration.h
@@ -1,5 +1,5 @@
-#ifndef TILE_BASE_CONFIG_CONFIG_H
-#define TILE_BASE_CONFIG_CONFIG_H
+#ifndef TILE_BASE_CONFIG_CONFIGURATION_H
+#define TILE_BASE_CONFIG_CONFIGURATION_H
 
 #pragma once
 #include "tile/base/optional.h"
@@ -12,10 +12,10 @@
 
 namespace tile {
 namespace util {
-class Config : public RefCounted<Config> {
+class Configuration : public RefCounted<Configuration> {
 public:
   using Keys = std::vector<std::string>;
-  using Ptr = RefPtr<Config>;
+  using Ptr = RefPtr<Configuration>;
 
   // events
   // Key, Value
@@ -98,13 +98,13 @@ protected:
 protected:
   class ScopedLock {
   public:
-    explicit ScopedLock(const Config &config) : config_(config) {
+    explicit ScopedLock(const Configuration &config) : config_(config) {
       config_.mutex_.Lock();
     }
     ~ScopedLock() { config_.mutex_.Unlock(); }
 
   private:
-    const Config &config_;
+    const Configuration &config_;
   };
 
   virtual bool GetRaw(const Slice &key, std::string *value) const = 0;
@@ -112,10 +112,10 @@ protected:
   virtual void RemoveRaw(const Slice &key) = 0;
   virtual Keys Enumerate(const Slice &range) const = 0;
   void SetRawWithEvent(const Slice &key, const std::string &value);
-  virtual ~Config();
+  virtual ~Configuration();
 
-  friend class std::default_delete<Config>;
-  friend class LayeredConfig;
+  friend class std::default_delete<Configuration>;
+  friend class LayeredConfiguration;
 
 private:
   mutable Mutex mutex_;
@@ -124,4 +124,4 @@ private:
 } // namespace util
 } // namespace tile
 
-#endif // TILE_BASE_CONFIG_CONFIG_H
+#endif // TILE_BASE_CONFIG_CONFIGURATION_H
diff --git a/tile/base/config/ini_file_config.cc b/tile/base/config/ini_file_configuration.cc
similarity index 77%
rename from tile/base/config/ini_file_config.cc
rename to tile/base/config/ini_file_configuration.cc
index c3838c5..cb2c9bc 100644
--- a/tile/base/config/ini_file_config.cc
+++ b/tile/base/config/ini_file_configuration.cc
@@ -1,16 +1,16 @@
-#include "tile/base/config/ini_file_config.h"
+#include "tile/base/config/ini_file_configuration.h"
 #include "tile/base/thread/scoped_lock.h"
 
 namespace tile {
 namespace util {
 
-IniFileConfig::IniFileConfig() {}
+IniFileConfiguration::IniFileConfiguration() {}
 // IniFileConfig::IniFileConfig(std::istream &istr) { load(istr); }
 // IniFileConfig::IniFileConfig(const std::string &path) { load(path); }
-IniFileConfig::~IniFileConfig() {}
+IniFileConfiguration::~IniFileConfiguration() {}
 
-bool IniFileConfig::load(std::istream &istr) {
-  Config::ScopedLock lock(*this);
+bool IniFileConfiguration::load(std::istream &istr) {
+  Configuration::ScopedLock lock(*this);
   map_.clear();
   section_key_.clear();
   while (!istr.eof()) {
@@ -18,7 +18,7 @@ bool IniFileConfig::load(std::istream &istr) {
   }
   return true;
 }
-bool IniFileConfig::load(const std::string &path) {
+bool IniFileConfiguration::load(const std::string &path) {
   std::ifstream istr(path);
   if (istr.good()) {
     return load(istr);
@@ -26,7 +26,7 @@ bool IniFileConfig::load(const std::string &path) {
     return false;
   }
 }
-bool IniFileConfig::GetRaw(const Slice &key, std::string *value) const {
+bool IniFileConfiguration::GetRaw(const Slice &key, std::string *value) const {
   auto iter = map_.find(key.ToString());
   if (iter != map_.end()) {
     *value = iter->second;
@@ -35,12 +35,12 @@ bool IniFileConfig::GetRaw(const Slice &key, std::string *value) const {
     return false;
   }
 }
-bool IniFileConfig::SetRaw(const Slice &key, const Slice &value) {
+bool IniFileConfiguration::SetRaw(const Slice &key, const Slice &value) {
   map_[key] = value;
   return true;
 }
 
-void IniFileConfig::RemoveRaw(const Slice &key) {
+void IniFileConfiguration::RemoveRaw(const Slice &key) {
   std::string prefix = key;
   if (!prefix.empty()) {
     prefix.push_back('.');
@@ -57,8 +57,8 @@ void IniFileConfig::RemoveRaw(const Slice &key) {
   }
 }
 
-Config::Keys IniFileConfig::Enumerate(const Slice &key) const {
-  Config::Keys range;
+Configuration::Keys IniFileConfiguration::Enumerate(const Slice &key) const {
+  Configuration::Keys range;
   std::set<Slice> keys;
   std::string prefix = key.ToString();
   if (prefix.empty()) {
@@ -86,7 +86,7 @@ Config::Keys IniFileConfig::Enumerate(const Slice &key) const {
   return range;
 }
 
-void IniFileConfig::ParseLine(std::istream &istr) {
+void IniFileConfiguration::ParseLine(std::istream &istr) {
   static const int eof = std::char_traits<char>::eof();
   auto ReadLine = [&](std::string *line) {
     line->clear();
@@ -135,8 +135,8 @@ void IniFileConfig::ParseLine(std::istream &istr) {
     }
   }
 }
-bool IniFileConfig::ICompare::operator()(const std::string &s1,
-                                         const std::string &s2) const {
+bool IniFileConfiguration::ICompare::operator()(const std::string &s1,
+                                                const std::string &s2) const {
   auto len = std::min(s1.size(), s2.size());
   return strncmp(s1.c_str(), s2.c_str(), len) < 0;
 }
diff --git a/tile/base/config/ini_file_config.h b/tile/base/config/ini_file_configuration.h
similarity index 81%
rename from tile/base/config/ini_file_config.h
rename to tile/base/config/ini_file_configuration.h
index fe3e1a9..f9a1b08 100644
--- a/tile/base/config/ini_file_config.h
+++ b/tile/base/config/ini_file_configuration.h
@@ -3,17 +3,17 @@
 
 #pragma once
 
-#include "tile/base/config/config.h"
+#include "tile/base/config/configuration.h"
 #include <map>
 
 namespace tile {
 namespace util {
-class IniFileConfig : public Config {
+class IniFileConfiguration : public Configuration {
 public:
-  using Ptr = RefPtr<IniFileConfig>;
+  using Ptr = RefPtr<IniFileConfiguration>;
 
-  IniFileConfig();
-  ~IniFileConfig() override;
+  IniFileConfiguration();
+  ~IniFileConfiguration() override;
   // IniFileConfig(std::istream &istr);
   // IniFileConfig(const std::string &path);
   bool load(std::istream &istr);
diff --git a/tile/base/config/ini_file_config_test.cc b/tile/base/config/ini_file_configuration_test.cc
similarity index 72%
rename from tile/base/config/ini_file_config_test.cc
rename to tile/base/config/ini_file_configuration_test.cc
index e110933..ffd1de2 100644
--- a/tile/base/config/ini_file_config_test.cc
+++ b/tile/base/config/ini_file_configuration_test.cc
@@ -1,4 +1,4 @@
-#include "tile/base/config/ini_file_config.h"
+#include "tile/base/config/ini_file_configuration.h"
 #include "gtest/gtest.h"
 
 const char *kIniFileConfig = R"(
@@ -18,16 +18,17 @@ a=4
 namespace tile {
 namespace util {
 
-static_assert(!detail::HasClassofImpl<IniFileConfig, Config>::value, "");
+static_assert(
+    !detail::HasClassofImpl<IniFileConfiguration, Configuration>::value, "");
 
 TEST(IniFileConfig, LoadFromIStream) {
   std::stringstream ss(kIniFileConfig);
-  Config::Ptr config = MakeRefCounted<IniFileConfig>();
+  Configuration::Ptr config = MakeRefCounted<IniFileConfiguration>();
   ASSERT_FALSE(config->Has("a"));
   ASSERT_FALSE(config->Has("sec1.a"));
   ASSERT_FALSE(config->Has("sec3.a"));
-  if (config.Is<IniFileConfig>()) {
-    IniFileConfig::Ptr ini = config.As<IniFileConfig>();
+  if (config.Is<IniFileConfiguration>()) {
+    IniFileConfiguration::Ptr ini = config.As<IniFileConfiguration>();
     ASSERT_TRUE(ini->load(ss));
   }
   ASSERT_TRUE(config->Has("a"));
diff --git a/tile/base/config/layered_config.cc b/tile/base/config/layered_config.cc
deleted file mode 100644
index 3b90173..0000000
--- a/tile/base/config/layered_config.cc
+++ /dev/null
@@ -1,129 +0,0 @@
-#include "tile/base/config/layered_config.h"
-
-namespace tile {
-namespace util {
-
-LayeredConfig::LayeredConfig() {}
-LayeredConfig::~LayeredConfig() {}
-
-void LayeredConfig::Add(Config::Ptr cfg) { Add(cfg, highest(), false); }
-
-void LayeredConfig::Add(Config::Ptr cfg, int priority) {
-  Add(cfg, priority, false);
-}
-
-void LayeredConfig::Add(Config::Ptr cfg, const std::string &label) {
-  Add(cfg, label, highest(), false);
-}
-
-void LayeredConfig::Add(Config::Ptr cfg, const std::string &label,
-                        int priority) {
-  Add(cfg, label, priority, false);
-}
-
-void LayeredConfig::Add(Config::Ptr cfg, const std::string &label,
-                        bool writeable) {
-  Add(cfg, label, highest(), writeable);
-}
-
-void LayeredConfig::Add(Config::Ptr cfg, const std::string &label, int priority,
-                        bool writeable) {
-  Config::ScopedLock lock(*this);
-  ConfigItem item;
-  item.cfg = cfg;
-  item.priority = priority;
-  item.writeable = writeable;
-  item.label = label;
-  auto it = configs_.begin();
-  while (it != configs_.end() && it->priority < priority) {
-    ++it;
-  }
-  configs_.insert(it, item);
-}
-
-void LayeredConfig::Add(Config::Ptr cfg, int priority, bool writeable) {
-  Add(cfg, std::string(), priority, writeable);
-}
-void LayeredConfig::AddWriteable(Config::Ptr cfg, int priority) {
-  Add(cfg, priority, true);
-}
-
-Config::Ptr LayeredConfig::Find(const Slice &label) const {
-  Config::ScopedLock lock(*this);
-
-  for (const auto &conf : configs_) {
-    if (conf.label == label) {
-      return conf.cfg;
-    }
-  }
-  return 0;
-}
-
-void LayeredConfig::RemoveConfig(Config::Ptr cfg) {
-  Config::ScopedLock lock(*this);
-  for (auto it = configs_.begin(); it != configs_.end();) {
-    if (it->cfg == cfg) {
-      it = configs_.erase(it);
-    } else {
-      ++it;
-    }
-  }
-}
-
-bool LayeredConfig::GetRaw(const Slice &key, std::string *value) const {
-  for (const auto &conf : configs_) {
-    if (conf.cfg->GetRaw(key, value)) {
-      return true;
-    }
-  }
-  return false;
-}
-
-bool LayeredConfig::SetRaw(const Slice &key, const Slice &value) {
-  for (const auto &conf : configs_) {
-    if (conf.writeable && conf.cfg->SetRaw(key, value)) {
-      return true;
-    }
-  }
-  return false;
-}
-
-Config::Keys LayeredConfig::Enumerate(const Slice &key) const {
-  Config::Keys keys;
-  std::set<Slice> key_set;
-  for (const auto &conf : configs_) {
-    auto conf_keys = conf.cfg->Enumerate(key);
-    for (const auto &k : conf_keys) {
-      if (key_set.insert(k).second) {
-        keys.push_back(k);
-      }
-    }
-  }
-  return keys;
-}
-
-void LayeredConfig::RemoveRaw(const std::string &key) {
-  for (auto &conf : configs_) {
-    if (conf.writeable) {
-      conf.cfg->RemoveRaw(key);
-    }
-  }
-}
-
-int LayeredConfig::lowest() const {
-  if (configs_.empty()) {
-    return 0;
-  } else {
-    return configs_.front().priority - 1;
-  }
-}
-int LayeredConfig::highest() const {
-  if (configs_.empty()) {
-    return 0;
-  } else {
-    return configs_.back().priority + 1;
-  }
-}
-
-} // namespace util
-} // namespace tile
diff --git a/tile/base/config/layered_config.h b/tile/base/config/layered_config.h
deleted file mode 100644
index e481515..0000000
--- a/tile/base/config/layered_config.h
+++ /dev/null
@@ -1,57 +0,0 @@
-#ifndef TILE_BASE_CONFIG_LAYERED_CONFIG_H
-#define TILE_BASE_CONFIG_LAYERED_CONFIG_H
-
-#pragma once
-
-#include "tile/base/config/config.h"
-#include <list>
-
-namespace tile {
-namespace util {
-class LayeredConfig : public Config {
-public:
-  using Ptr = RefPtr<LayeredConfig>;
-  LayeredConfig();
-  LayeredConfig(const LayeredConfig &) = delete;
-  LayeredConfig &operator=(const LayeredConfig &) = delete;
-
-  void Add(Config::Ptr cfg);
-  void Add(Config::Ptr cfg, int priority);
-  void Add(Config::Ptr cfg, const std::string &label);
-  void Add(Config::Ptr cfg, const std::string &label, int priority);
-  void Add(Config::Ptr cfg, const std::string &label, bool writeable);
-  void Add(Config::Ptr cfg, const std::string &label, int priority,
-           bool writeable);
-  void Add(Config::Ptr cfg, int priority, bool writeable);
-  void AddWriteable(Config::Ptr cfg, int priority);
-  Config::Ptr Find(const Slice &label) const;
-  void RemoveConfig(Config::Ptr cfg);
-
-protected:
-  struct ConfigItem {
-    Config::Ptr cfg;
-    // ... > -2 > -1 > 0 > 1 > 2 > 3 > 4 ...
-    int priority;
-    // can remove or set new?
-    bool writeable;
-    std::string label;
-  };
-
-  bool GetRaw(const Slice &key, std::string *value) const override;
-  bool SetRaw(const Slice &key, const Slice &value) override;
-  Config::Keys Enumerate(const Slice &key) const override;
-  void RemoveRaw(const std::string &key);
-
-  int lowest() const;
-  int highest() const;
-
-  ~LayeredConfig();
-
-private:
-  using ConfigList = std::list<ConfigItem>;
-  ConfigList configs_;
-};
-} // namespace util
-} // namespace tile
-
-#endif // TILE_BASE_CONFIG_LAYERED_CONFIG_H
diff --git a/tile/base/config/layered_configuration.cc b/tile/base/config/layered_configuration.cc
new file mode 100644
index 0000000..80910ed
--- /dev/null
+++ b/tile/base/config/layered_configuration.cc
@@ -0,0 +1,133 @@
+#include "tile/base/config/layered_configuration.h"
+
+namespace tile {
+namespace util {
+
+LayeredConfiguration::LayeredConfiguration() {}
+LayeredConfiguration::~LayeredConfiguration() {}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg) {
+  Add(cfg, highest(), false);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg, int priority) {
+  Add(cfg, priority, false);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg,
+                               const std::string &label) {
+  Add(cfg, label, highest(), false);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg, const std::string &label,
+                               int priority) {
+  Add(cfg, label, priority, false);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg, const std::string &label,
+                               bool writeable) {
+  Add(cfg, label, highest(), writeable);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg, const std::string &label,
+                               int priority, bool writeable) {
+  Configuration::ScopedLock lock(*this);
+  ConfigItem item;
+  item.cfg = cfg;
+  item.priority = priority;
+  item.writeable = writeable;
+  item.label = label;
+  auto it = configs_.begin();
+  while (it != configs_.end() && it->priority < priority) {
+    ++it;
+  }
+  configs_.insert(it, item);
+}
+
+void LayeredConfiguration::Add(Configuration::Ptr cfg, int priority,
+                               bool writeable) {
+  Add(cfg, std::string(), priority, writeable);
+}
+void LayeredConfiguration::AddWriteable(Configuration::Ptr cfg, int priority) {
+  Add(cfg, priority, true);
+}
+
+Configuration::Ptr LayeredConfiguration::Find(const Slice &label) const {
+  Configuration::ScopedLock lock(*this);
+
+  for (const auto &conf : configs_) {
+    if (conf.label == label) {
+      return conf.cfg;
+    }
+  }
+  return 0;
+}
+
+void LayeredConfiguration::RemoveConfig(Configuration::Ptr cfg) {
+  Configuration::ScopedLock lock(*this);
+  for (auto it = configs_.begin(); it != configs_.end();) {
+    if (it->cfg == cfg) {
+      it = configs_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+}
+
+bool LayeredConfiguration::GetRaw(const Slice &key, std::string *value) const {
+  for (const auto &conf : configs_) {
+    if (conf.cfg->GetRaw(key, value)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool LayeredConfiguration::SetRaw(const Slice &key, const Slice &value) {
+  for (const auto &conf : configs_) {
+    if (conf.writeable && conf.cfg->SetRaw(key, value)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+Configuration::Keys LayeredConfiguration::Enumerate(const Slice &key) const {
+  Configuration::Keys keys;
+  std::set<Slice> key_set;
+  for (const auto &conf : configs_) {
+    auto conf_keys = conf.cfg->Enumerate(key);
+    for (const auto &k : conf_keys) {
+      if (key_set.insert(k).second) {
+        keys.push_back(k);
+      }
+    }
+  }
+  return keys;
+}
+
+void LayeredConfiguration::RemoveRaw(const std::string &key) {
+  for (auto &conf : configs_) {
+    if (conf.writeable) {
+      conf.cfg->RemoveRaw(key);
+    }
+  }
+}
+
+int LayeredConfiguration::lowest() const {
+  if (configs_.empty()) {
+    return 0;
+  } else {
+    return configs_.front().priority - 1;
+  }
+}
+int LayeredConfiguration::highest() const {
+  if (configs_.empty()) {
+    return 0;
+  } else {
+    return configs_.back().priority + 1;
+  }
+}
+
+} // namespace util
+} // namespace tile
diff --git a/tile/base/config/layered_configuration.h b/tile/base/config/layered_configuration.h
new file mode 100644
index 0000000..db498ff
--- /dev/null
+++ b/tile/base/config/layered_configuration.h
@@ -0,0 +1,57 @@
+#ifndef TILE_BASE_CONFIG_LAYERED_CONFIGURATION_H
+#define TILE_BASE_CONFIG_LAYERED_CONFIGURATION_H
+
+#pragma once
+
+#include "tile/base/config/configuration.h"
+#include <list>
+
+namespace tile {
+namespace util {
+class LayeredConfiguration : public Configuration {
+public:
+  using Ptr = RefPtr<LayeredConfiguration>;
+  LayeredConfiguration();
+  LayeredConfiguration(const LayeredConfiguration &) = delete;
+  LayeredConfiguration &operator=(const LayeredConfiguration &) = delete;
+
+  void Add(Configuration::Ptr cfg);
+  void Add(Configuration::Ptr cfg, int priority);
+  void Add(Configuration::Ptr cfg, const std::string &label);
+  void Add(Configuration::Ptr cfg, const std::string &label, int priority);
+  void Add(Configuration::Ptr cfg, const std::string &label, bool writeable);
+  void Add(Configuration::Ptr cfg, const std::string &label, int priority,
+           bool writeable);
+  void Add(Configuration::Ptr cfg, int priority, bool writeable);
+  void AddWriteable(Configuration::Ptr cfg, int priority);
+  Configuration::Ptr Find(const Slice &label) const;
+  void RemoveConfig(Configuration::Ptr cfg);
+
+protected:
+  struct ConfigItem {
+    Configuration::Ptr cfg;
+    // ... > -2 > -1 > 0 > 1 > 2 > 3 > 4 ...
+    int priority;
+    // can remove or set new?
+    bool writeable;
+    std::string label;
+  };
+
+  bool GetRaw(const Slice &key, std::string *value) const override;
+  bool SetRaw(const Slice &key, const Slice &value) override;
+  Configuration::Keys Enumerate(const Slice &key) const override;
+  void RemoveRaw(const std::string &key);
+
+  int lowest() const;
+  int highest() const;
+
+  ~LayeredConfiguration();
+
+private:
+  using ConfigList = std::list<ConfigItem>;
+  ConfigList configs_;
+};
+} // namespace util
+} // namespace tile
+
+#endif // TILE_BASE_CONFIG_LAYERED_CONFIGURATION_H
diff --git a/tile/base/configuration.h b/tile/base/configuration.h
new file mode 100644
index 0000000..0a980a9
--- /dev/null
+++ b/tile/base/configuration.h
@@ -0,0 +1,11 @@
+#ifndef TILE_BASE_CONFIGURATION_H
+#define TILE_BASE_CONFIGURATION_H
+
+#pragma once
+
+#include "tile/base/config/configurable.h"
+#include "tile/base/config/configuration.h"
+#include "tile/base/config/ini_file_configuration.h"
+#include "tile/base/config/layered_configuration.h"
+
+#endif // TILE_BASE_CONFIGURATION_H
diff --git a/tile/tile.h b/tile/tile.h
index 45a6cfd..288a809 100644
--- a/tile/tile.h
+++ b/tile/tile.h
@@ -9,7 +9,6 @@
 #include "tile/base/casting.h"
 #include "tile/base/chrono.h"
 #include "tile/base/compression.h"
-#include "tile/base/config/ini_file_config.h"
 #include "tile/base/data.h"
 #include "tile/base/deferred.h"
 #include "tile/base/demangle.h"
@@ -40,13 +39,12 @@
 #include "tile/base/write_mostly.h"
 
 // util
-#include "tile/util/config.h"
-#include "tile/util/ini_file_config.h"
+#include "tile/base/configuration.h"
 
 // init module
 #include "tile/init/override_flag.h"
 
-#include "sigslot/signal.h"
+#include "sigslot/sigslot.h"
 
 // Tile Init
 #include "mustache.hpp"