diff --git a/include/hueplusplus/Hue.h b/include/hueplusplus/Hue.h
index 5107080..3afd94b 100644
--- a/include/hueplusplus/Hue.h
+++ b/include/hueplusplus/Hue.h
@@ -42,6 +42,8 @@
 
 #include "json/json.hpp"
 
+#include "ResourceList.h"
+
 //! \brief Namespace for the hueplusplus library
 namespace hueplusplus
 {
@@ -140,12 +142,12 @@ public:
     //! \brief Function to get the ip address of the hue bridge
     //!
     //! \return string containing ip
-    std::string getBridgeIP();
+    std::string getBridgeIP() const;
 
     //! \brief Function to get the port of the hue bridge
     //!
     //! \return integer containing port
-    int getBridgePort();
+    int getBridgePort() const;
 
     //! \brief Send a username request to the Hue bridge.
     //!
@@ -161,7 +163,7 @@ public:
     //! \brief Function that returns the username
     //!
     //! \return The username used for API access
-    std::string getUsername();
+    std::string getUsername() const;
 
     //! \brief Function to set the ip address of this class representing a bridge
     //!
@@ -337,7 +339,7 @@ public:
     //! because Philips provides different file types. \param id Id of a light to
     //! get the picture of \return String that either contains the filename of the
     //! picture of the light or if it was not found an empty string
-    std::string getPictureOfLight(int id) const;
+    std::string getPictureOfLight(int id);
 
     //! \brief Const function that returns the picture name of a given model id
     //!
@@ -354,15 +356,16 @@ private:
                     //!< like "192.168.2.1"
     std::string username; //!< Username that is ussed to access the hue bridge
     int port;
-    std::map<int, HueLight> lights; //!< Maps ids to HueLights that are controlled by this bridge
-    std::map<int, Group> groups; //!< Maps ids to Groups
-    std::map<int, Schedule> schedules; //!< Maps ids to Schedules
 
     std::shared_ptr<const IHttpHandler> http_handler; //!< A IHttpHandler that is used to communicate with the
                                                       //!< bridge
     HueCommandAPI commands; //!< A HueCommandAPI that is used to communicate with the bridge
-    APICache stateCache; //!< The state of the hue bridge as it is returned from it
-    HueLightFactory lightFactory;
+    std::chrono::steady_clock::duration refreshDuration;
+
+    ResourceList<HueLight, int> lights;
+    CreateableResourceList<Group, int, CreateGroup> groups;
+    CreateableResourceList<Schedule, int, CreateSchedule> schedules;
+
 };
 } // namespace hueplusplus
 
diff --git a/include/hueplusplus/ResourceList.h b/include/hueplusplus/ResourceList.h
new file mode 100644
index 0000000..fbbdfc4
--- /dev/null
+++ b/include/hueplusplus/ResourceList.h
@@ -0,0 +1,188 @@
+/**
+    \file ResourceList.h
+    Copyright Notice\n
+    Copyright (C) 2020  Jan Rogall		- developer\n
+
+    This file is part of hueplusplus.
+
+    hueplusplus is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    hueplusplus is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with hueplusplus.  If not, see <http://www.gnu.org/licenses/>.
+**/
+
+#ifndef INCLUDE_RESOURCE_LIST_H
+#define INCLUDE_RESOURCE_LIST_H
+
+#include <functional>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "APICache.h"
+#include "HueException.h"
+
+namespace hueplusplus
+{
+template <typename Resource, typename IdType>
+class ResourceList
+{
+public:
+    ResourceList(const HueCommandAPI& commands, const std::string& path,
+        std::chrono::steady_clock::duration refreshDuration,
+        const std::function<Resource(int, const nlohmann::json&)>& factory = nullptr)
+        : commands(commands), stateCache(path, commands, refreshDuration), path(path + '/'), factory(factory)
+    {}
+
+    ResourceList(const ResourceList&) = delete;
+    ResourceList(ResourceList&&) = default;
+    ResourceList& operator=(const ResourceList&) = delete;
+    ResourceList& operator=(ResourceList&&) = default;
+
+    void refresh() { stateCache.refresh(); }
+
+    std::vector<std::reference_wrapper<Resource>> getAll()
+    {
+        nlohmann::json state = stateCache.getValue();
+        for (auto it = state.begin(); it != state.end(); ++it)
+        {
+            get(maybeStoi(it.key()));
+        }
+        std::vector<std::reference_wrapper<Resource>> result;
+        result.reserve(state.size());
+        for (auto& entry : resources)
+        {
+            result.emplace_back(entry.second);
+        }
+        return result;
+    }
+
+    Resource& get(const IdType& id)
+    {
+        auto pos = resources.find(id);
+        if (pos != resources.end())
+        {
+            pos->second.refresh();
+            return pos->second;
+        }
+        const nlohmann::json& state = stateCache.getValue();
+        std::string key = maybeToString(id);
+        if (!state.count(key))
+        {
+            throw HueException(FileInfo {__FILE__, __LINE__, __func__}, "Resource id is not valid");
+        }
+        return resources.emplace(id, construct(id, state[key])).first->second;
+    }
+
+    bool exists(const IdType& id) const
+    {
+        auto pos = resources.find(id);
+        if (pos != resources.end())
+        {
+            return true;
+        }
+        return stateCache.getValue().count(maybeToString(id)) != 0;
+    }
+
+    bool remove(const IdType& id)
+    {
+        std::string requestPath = path + maybeToString(id);
+        nlohmann::json result
+            = commands.DELETERequest(requestPath, nlohmann::json::object(), FileInfo {__FILE__, __LINE__, __func__});
+        bool success = utils::safeGetMember(result, 0, "success") == requestPath;
+        auto it = resources.find(id);
+        if (success && it != resources.end())
+        {
+            resources.erase(it);
+        }
+        return success;
+    }
+
+protected:
+    static IdType maybeStoi(const std::string& key) { return maybeStoi(key, std::is_integral<IdType> {}); }
+
+    static std::string maybeToString(const IdType& id) { return maybeToString(id, std::is_integral<IdType> {}); }
+
+    Resource construct(const IdType& id, const nlohmann::json& state)
+    {
+        return construct(id, state, std::is_constructible<Resource, IdType, HueCommandAPI, nlohmann::json> {});
+    }
+
+private:
+    // Resource is constructable
+    Resource construct(const IdType& id, const nlohmann::json& state, std::true_type)
+    {
+        if (factory)
+        {
+            return factory(id, state);
+        }
+        else
+        {
+            return Resource(id, commands, stateCache.getRefreshDuration());
+        }
+    }
+    // Resource is not constructable
+    Resource construct(const IdType& id, const nlohmann::json& state, std::false_type)
+    {
+        if (!factory)
+        {
+            throw HueException(FileInfo {__FILE__, __LINE__, __func__},
+                "Resource is not constructable with default parameters, but no factory given");
+        }
+        return factory(id, state);
+    }
+
+private:
+    static IdType maybeStoi(const std::string& key, std::true_type) { return std::stoi(key); }
+    static IdType maybeStoi(const std::string& key, std::false_type) { return key; }
+    static std::string maybeToString(IdType id, std::true_type) { return std::to_string(id); }
+    static std::string maybeToString(const IdType& id, std::false_type) { return id; }
+
+protected:
+    std::function<Resource(int, const nlohmann::json&)> factory;
+
+    HueCommandAPI commands;
+    APICache stateCache;
+    std::string path;
+
+    std::map<IdType, Resource> resources;
+};
+
+template <typename Resource, typename IdType, typename CreateType>
+class CreateableResourceList : public ResourceList<Resource, IdType>
+{
+public:
+    using ResourceList::ResourceList;
+
+    IdType create(const CreateType& params)
+    {
+        std::string requestPath = path;
+        // Remove leading slash
+        requestPath.pop_back();
+        nlohmann::json response
+            = commands.POSTRequest(requestPath, params.getRequest(), FileInfo {__FILE__, __LINE__, __func__});
+        nlohmann::json id = utils::safeGetMember(response, 0, "success", "id");
+        if (id.is_string())
+        {
+            std::string idStr = id.get<std::string>();
+            if (idStr.find(path) == 0)
+            {
+                idStr.erase(0, path.size());
+            }
+            stateCache.refresh();
+            return maybeStoi(idStr);
+        }
+        return IdType {};
+    }
+};
+} // namespace hueplusplus
+
+#endif
diff --git a/src/Hue.cpp b/src/Hue.cpp
index e071565..26d99a7 100644
--- a/src/Hue.cpp
+++ b/src/Hue.cpp
@@ -132,20 +132,24 @@ std::string HueFinder::ParseDescription(const std::string& description)
 Hue::Hue(const std::string& ip, const int port, const std::string& username,
     std::shared_ptr<const IHttpHandler> handler, std::chrono::steady_clock::duration refreshDuration)
     : ip(ip),
-      port(port),
       username(username),
+      port(port),
       http_handler(std::move(handler)),
       commands(ip, port, username, http_handler),
-      stateCache("", commands, refreshDuration),
-      lightFactory(commands, refreshDuration)
+      refreshDuration(refreshDuration),
+      lights(commands, "/lights", refreshDuration,
+          [factory = HueLightFactory(commands, refreshDuration)](
+              int id, const nlohmann::json& state) mutable { return factory.createLight(state, id); }),
+      groups(commands, "/groups", refreshDuration),
+      schedules(commands, "/schedules", refreshDuration)
 {}
 
-std::string Hue::getBridgeIP()
+std::string Hue::getBridgeIP() const
 {
     return ip;
 }
 
-int Hue::getBridgePort()
+int Hue::getBridgePort() const
 {
     return port;
 }
@@ -200,7 +204,7 @@ std::string Hue::requestUsername()
     return username;
 }
 
-std::string Hue::getUsername()
+std::string Hue::getUsername() const
 {
     return username;
 }
@@ -217,242 +221,75 @@ void Hue::setPort(const int port)
 
 HueLight& Hue::getLight(int id)
 {
-    auto pos = lights.find(id);
-    if (pos != lights.end())
-    {
-        pos->second.refresh();
-        return pos->second;
-    }
-    const nlohmann::json& lightsCache = stateCache.getValue()["lights"];
-    if (!lightsCache.count(std::to_string(id)))
-    {
-        std::cerr << "Error in Hue getLight(): light with id " << id << " is not valid\n";
-        throw HueException(CURRENT_FILE_INFO, "Light id is not valid");
-    }
-    auto light = lightFactory.createLight(lightsCache[std::to_string(id)], id);
-    lights.emplace(id, light);
-    return lights.find(id)->second;
+    return lights.get(id);
 }
 
 bool Hue::removeLight(int id)
 {
-    nlohmann::json result
-        = commands.DELETERequest("/lights/" + std::to_string(id), nlohmann::json::object(), CURRENT_FILE_INFO);
-    bool success = utils::safeGetMember(result, 0, "success") == "/lights/" + std::to_string(id) + " deleted";
-    if (success && lights.count(id) != 0)
-    {
-        lights.erase(id);
-    }
-    return success;
+    return lights.remove(id);
 }
 
 std::vector<std::reference_wrapper<HueLight>> Hue::getAllLights()
 {
-    // No reference because getLight may invalidate it
-    nlohmann::json lightsState = stateCache.getValue()["lights"];
-    for (auto it = lightsState.begin(); it != lightsState.end(); ++it)
-    {
-        getLight(std::stoi(it.key()));
-    }
-    std::vector<std::reference_wrapper<HueLight>> result;
-    for (auto& entry : lights)
-    {
-        result.emplace_back(entry.second);
-    }
-    return result;
+    return lights.getAll();
 }
 
 std::vector<std::reference_wrapper<Group>> Hue::getAllGroups()
 {
-    nlohmann::json groupsState = stateCache.getValue().at("groups");
-    for (auto it = groupsState.begin(); it != groupsState.end(); ++it)
-    {
-        getGroup(std::stoi(it.key()));
-    }
-    std::vector<std::reference_wrapper<Group>> result;
-    result.reserve(result.size());
-    for (auto& entry : groups)
-    {
-        result.emplace_back(entry.second);
-    }
-    return result;
+    return groups.getAll();
 }
 
 Group& Hue::getGroup(int id)
 {
-    auto pos = groups.find(id);
-    if (pos != groups.end())
-    {
-        pos->second.refresh();
-        return pos->second;
-    }
-    const nlohmann::json& groupsCache = stateCache.getValue()["groups"];
-    if (!groupsCache.count(std::to_string(id)))
-    {
-        std::cerr << "Error in Hue getGroup(): group with id " << id << " is not valid\n";
-        throw HueException(CURRENT_FILE_INFO, "Group id is not valid");
-    }
-    return groups.emplace(id, Group(id, commands, stateCache.getRefreshDuration())).first->second;
+    return groups.get(id);
 }
 
 bool Hue::removeGroup(int id)
 {
-    nlohmann::json result
-        = commands.DELETERequest("/groups/" + std::to_string(id), nlohmann::json::object(), CURRENT_FILE_INFO);
-    bool success = utils::safeGetMember(result, 0, "success") == "/groups/" + std::to_string(id) + " deleted";
-    if (success && groups.count(id) != 0)
-    {
-        groups.erase(id);
-    }
-    return success;
-}
-
-bool Hue::groupExists(int id)
-{
-    auto pos = lights.find(id);
-    if (pos != lights.end())
-    {
-        return true;
-    }
-    if (stateCache.getValue()["groups"].count(std::to_string(id)))
-    {
-        return true;
-    }
-    return false;
+    return groups.remove(id);
 }
 
 bool Hue::groupExists(int id) const
 {
-    auto pos = lights.find(id);
-    if (pos != lights.end())
-    {
-        return true;
-    }
-    if (stateCache.getValue()["groups"].count(std::to_string(id)))
-    {
-        return true;
-    }
-    return false;
+    return groups.exists(id);
 }
 
 int Hue::createGroup(const CreateGroup& params)
 {
-    nlohmann::json response = commands.POSTRequest("/groups", params.getRequest(), CURRENT_FILE_INFO);
-    nlohmann::json id = utils::safeGetMember(response, 0, "success", "id");
-    if (id.is_string())
-    {
-        std::string idStr = id.get<std::string>();
-        // Sometimes the response can be /groups/<id>?
-        if (idStr.find("/groups/") == 0)
-        {
-            idStr.erase(0, 8);
-        }
-        stateCache.refresh();
-        return std::stoi(idStr);
-    }
-    return 0;
-}
-
-bool Hue::lightExists(int id)
-{
-    auto pos = lights.find(id);
-    if (pos != lights.end())
-    {
-        return true;
-    }
-    if (stateCache.getValue()["lights"].count(std::to_string(id)))
-    {
-        return true;
-    }
-    return false;
+    return groups.create(params);
 }
 
 bool Hue::lightExists(int id) const
 {
-    auto pos = lights.find(id);
-    if (pos != lights.end())
-    {
-        return true;
-    }
-    if (stateCache.getValue()["lights"].count(std::to_string(id)))
-    {
-        return true;
-    }
-    return false;
+    return lights.exists(id);
 }
 
 std::vector<std::reference_wrapper<Schedule>> Hue::getAllSchedules()
 {
-    nlohmann::json schedulesState = stateCache.getValue().at("schedules");
-    for (auto it = schedulesState.begin(); it != schedulesState.end(); ++it)
-    {
-        getSchedule(std::stoi(it.key()));
-    }
-    std::vector<std::reference_wrapper<Schedule>> result;
-    result.reserve(result.size());
-    for (auto& entry : schedules)
-    {
-        result.emplace_back(entry.second);
-    }
-    return result;
+    return schedules.getAll();
 }
 
 Schedule& Hue::getSchedule(int id)
 {
-    auto pos = schedules.find(id);
-    if (pos != schedules.end())
-    {
-        pos->second.refresh();
-        return pos->second;
-    }
-    const nlohmann::json& schedulesCache = stateCache.getValue()["schedules"];
-    if (!schedulesCache.count(std::to_string(id)))
-    {
-        std::cerr << "Error in Hue getSchedule(): schedule with id " << id << " is not valid\n";
-        throw HueException(CURRENT_FILE_INFO, "Schedule id is not valid");
-    }
-    return schedules.emplace(id, Schedule(id, commands, stateCache.getRefreshDuration())).first->second;
+    return schedules.get(id);
 }
 
 bool Hue::scheduleExists(int id) const
 {
-    auto pos = schedules.find(id);
-    if (pos != schedules.end())
-    {
-        return true;
-    }
-    if (stateCache.getValue()["schedules"].count(std::to_string(id)))
-    {
-        return true;
-    }
-    return false;
+    return schedules.exists(id);
 }
 
 int Hue::createSchedule(const CreateSchedule& params)
 {
-    nlohmann::json response = commands.POSTRequest("/schedules", params.getRequest(), CURRENT_FILE_INFO);
-    nlohmann::json id = utils::safeGetMember(response, 0, "success", "id");
-    if (id.is_string())
-    {
-        std::string idStr = id.get<std::string>();
-        // Sometimes the response can be /groups/<id>?
-        if (idStr.find("/schedules/") == 0)
-        {
-            idStr.erase(0, 11);
-        }
-        stateCache.refresh();
-        return std::stoi(idStr);
-    }
-    return 0;
+    return schedules.create(params);
 }
 
-std::string Hue::getPictureOfLight(int id) const
+std::string Hue::getPictureOfLight(int id)
 {
     std::string ret = "";
-    auto pos = lights.find(id);
-    if (pos != lights.end())
+    if (lights.exists(id))
     {
-        ret = getPictureOfModel(pos->second.getModelId());
+        ret = getPictureOfModel(lights.get(id).getModelId());
     }
     return ret;
 }
@@ -585,7 +422,10 @@ void Hue::setHttpHandler(std::shared_ptr<const IHttpHandler> handler)
 {
     http_handler = handler;
     commands = HueCommandAPI(ip, port, username, handler);
-    stateCache = APICache("", commands, stateCache.getRefreshDuration());
-    lightFactory = HueLightFactory(commands, stateCache.getRefreshDuration());
+    lights = ResourceList<HueLight, int>(commands, "/lights", refreshDuration,
+        [factory = HueLightFactory(commands, refreshDuration)](
+            int id, const nlohmann::json& state) mutable { return factory.createLight(state, id); });
+    groups = CreateableResourceList<Group, int, CreateGroup>(commands, "/groups", refreshDuration);
+    schedules = CreateableResourceList<Schedule, int, CreateSchedule>(commands, "/schedules", refreshDuration);
 }
 } // namespace hueplusplus
diff --git a/test/test_Hue.cpp b/test/test_Hue.cpp
index 7b5ce28..3630c4d 100644
--- a/test/test_Hue.cpp
+++ b/test/test_Hue.cpp
@@ -116,15 +116,6 @@ TEST_F(HueFinderTest, GetBridge)
     EXPECT_EQ(test_bridge.getBridgePort(), getBridgePort()) << "Bridge Port not matching";
     EXPECT_EQ(test_bridge.getUsername(), getBridgeUsername()) << "Bridge username not matching";
 
-    // Verify that username is correctly set in api requests
-    nlohmann::json hue_bridge_state {{"lights", {}}};
-    EXPECT_CALL(
-        *handler, GETJson("/api/" + getBridgeUsername(), nlohmann::json::object(), getBridgeIp(), getBridgePort()))
-        .Times(1)
-        .WillOnce(Return(hue_bridge_state));
-
-    test_bridge.getAllLights();
-
     Mock::VerifyAndClearExpectations(handler.get());
 }
 
@@ -395,17 +386,8 @@ TEST(Hue, lightExists)
 
     Hue test_bridge(getBridgeIp(), getBridgePort(), getBridgeUsername(), handler);
 
-    EXPECT_EQ(true, test_bridge.lightExists(1));
-    EXPECT_EQ(false, test_bridge.lightExists(2));
-
-    const Hue const_test_bridge1 = test_bridge;
-    EXPECT_EQ(true, const_test_bridge1.lightExists(1));
-    EXPECT_EQ(false, const_test_bridge1.lightExists(2));
-
-    test_bridge.getLight(1);
-    const Hue const_test_bridge2 = test_bridge;
-    EXPECT_EQ(true, test_bridge.lightExists(1));
-    EXPECT_EQ(true, const_test_bridge2.lightExists(1));
+    EXPECT_EQ(true, Const(test_bridge).lightExists(1));
+    EXPECT_EQ(false, Const(test_bridge).lightExists(2));
 }
 
 TEST(Hue, getGroup)
@@ -517,17 +499,8 @@ TEST(Hue, groupExists)
 
     Hue test_bridge(getBridgeIp(), getBridgePort(), getBridgeUsername(), handler);
 
-    EXPECT_EQ(true, test_bridge.groupExists(1));
-    EXPECT_EQ(false, test_bridge.groupExists(2));
-
-    const Hue const_test_bridge1 = test_bridge;
-    EXPECT_EQ(true, const_test_bridge1.groupExists(1));
-    EXPECT_EQ(false, const_test_bridge1.groupExists(2));
-
-    test_bridge.getGroup(1);
-    const Hue const_test_bridge2 = test_bridge;
-    EXPECT_EQ(true, test_bridge.groupExists(1));
-    EXPECT_EQ(true, const_test_bridge2.groupExists(1));
+    EXPECT_EQ(true, Const(test_bridge).groupExists(1));
+    EXPECT_EQ(false, Const(test_bridge).groupExists(2));
 }
 
 TEST(Hue, getAllGroups)