diff --git a/src/EntityManager.cpp b/src/EntityManager.cpp
new file mode 100644
index 0000000..950644f
--- /dev/null
+++ b/src/EntityManager.cpp
@@ -0,0 +1,634 @@
+/*
+// Copyright (c) 2018 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#include <Utils.hpp>
+#include <dbus/properties.hpp>
+#include <nlohmann/json.hpp>
+#include <fstream>
+#include <regex>
+#include <boost/algorithm/string/predicate.hpp>
+#include <boost/algorithm/string/replace.hpp>
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/container/flat_map.hpp>
+#include <boost/container/flat_set.hpp>
+#include <VariantVisitors.hpp>
+
+constexpr const char *OUTPUT_DIR = "/var/configuration/";
+constexpr const char *CONFIGURATION_DIR = "/usr/share/configurations";
+constexpr const char *TEMPLATE_CHAR = "$";
+constexpr const size_t MAX_MAPPER_DEPTH = 99;
+
+namespace fs = std::experimental::filesystem;
+struct cmp_str
+{
+    bool operator()(const char *a, const char *b) const
+    {
+        return std::strcmp(a, b) < 0;
+    }
+};
+
+// underscore T for collison with dbus c api
+enum class probe_type_codes
+{
+    FALSE_T,
+    TRUE_T,
+    AND,
+    OR,
+    FOUND
+};
+const static boost::container::flat_map<const char *, probe_type_codes, cmp_str>
+    PROBE_TYPES{{{"FALSE", probe_type_codes::FALSE_T},
+                 {"TRUE", probe_type_codes::TRUE_T},
+                 {"AND", probe_type_codes::AND},
+                 {"OR", probe_type_codes::OR},
+                 {"FOUND", probe_type_codes::FOUND}}};
+
+using GetSubTreeType = std::vector<
+    std::pair<std::string,
+              std::vector<std::pair<std::string, std::vector<std::string>>>>>;
+
+using ManagedObjectType = boost::container::flat_map<
+    dbus::object_path,
+    boost::container::flat_map<
+        std::string,
+        boost::container::flat_map<std::string, dbus::dbus_variant>>>;
+
+boost::container::flat_map<
+    std::string,
+    std::vector<boost::container::flat_map<std::string, dbus::dbus_variant>>>
+    DBUS_PROBE_OBJECTS;
+std::vector<std::string> PASSED_PROBES;
+
+// todo: pass this through nicer
+std::shared_ptr<dbus::connection> SYSTEM_BUS;
+
+// calls the mapper to find all exposed objects of an interface type
+// and creates a vector<flat_map> that contains all the key value pairs
+// getManagedObjects
+bool findDbusObjects(
+    std::shared_ptr<dbus::connection> connection,
+    std::vector<boost::container::flat_map<std::string, dbus::dbus_variant>>
+        &interfaceDevices,
+    std::string interface)
+{
+    // find all connections in the mapper that expose a specific type
+    static const dbus::endpoint mapper("xyz.openbmc_project.ObjectMapper",
+                                       "/xyz/openbmc_project/object_mapper",
+                                       "xyz.openbmc_project.ObjectMapper",
+                                       "GetSubTree");
+    dbus::message getMap = dbus::message::new_call(mapper);
+    std::vector<std::string> objects = {interface};
+    if (!getMap.pack("", MAX_MAPPER_DEPTH, objects))
+    {
+        std::cerr << "Pack Failed GetSensorSubtree\n";
+        return false;
+    }
+    dbus::message getMapResp = connection->send(getMap);
+    GetSubTreeType interfaceSubtree;
+    if (!getMapResp.unpack(interfaceSubtree))
+    {
+        std::cerr << "Error communicating to mapper\n";
+        return false;
+    }
+    boost::container::flat_set<std::string> connections;
+    for (auto &object : interfaceSubtree)
+    {
+        for (auto &connPair : object.second)
+        {
+            connections.insert(connPair.first);
+        }
+    }
+    // iterate through the connections, adding creating individual device
+    // dictionaries
+    for (auto &conn : connections)
+    {
+        auto managedObj =
+            dbus::endpoint(conn, "/", "org.freedesktop.DBus.ObjectManager",
+                           "GetManagedObjects");
+        dbus::message getManagedObj = dbus::message::new_call(managedObj);
+        dbus::message getManagedObjResp = connection->send(getManagedObj);
+        ManagedObjectType managedInterface;
+        if (!getManagedObjResp.unpack(managedInterface))
+        {
+            std::cerr << "error getting managed object for device " << conn
+                      << "\n";
+            continue;
+        }
+        for (auto &interfaceManagedObj : managedInterface)
+        {
+            auto ifaceObjFind = interfaceManagedObj.second.find(interface);
+            if (ifaceObjFind != interfaceManagedObj.second.end())
+            {
+                interfaceDevices.emplace_back(ifaceObjFind->second);
+            }
+        }
+    }
+    return true;
+}
+
+// probes interface dictionary for a key with a value that matches a regex
+bool probeDbus(
+    const std::string &interface,
+    const std::map<std::string, nlohmann::json> &matches,
+    std::vector<boost::container::flat_map<std::string, dbus::dbus_variant>>
+        &devices,
+    bool &foundProbe)
+{
+    auto &dbusObject = DBUS_PROBE_OBJECTS[interface];
+    if (dbusObject.empty())
+    {
+        if (!findDbusObjects(SYSTEM_BUS, dbusObject, interface))
+        {
+            std::cerr << "Found no dbus objects with interface "
+                      << interface << "\n";
+            foundProbe = false;
+            return false;
+        }
+    }
+    foundProbe = true;
+
+    bool foundMatch = false;
+    for (auto &device : dbusObject)
+    {
+        bool deviceMatches = true;
+        for (auto &match : matches)
+        {
+            auto deviceValue = device.find(match.first);
+            if (deviceValue != device.end())
+            {
+                switch (match.second.type())
+                {
+                case nlohmann::json::value_t::string:
+                {
+                    std::regex search(match.second.get<std::string>());
+                    std::smatch match;
+
+                    // convert value to string respresentation
+                    std::string probeValue = boost::apply_visitor(
+                        [](const auto &x) {
+                            return boost::lexical_cast<std::string>(x);
+                        },
+                        deviceValue->second);
+                    if (!std::regex_search(probeValue, match, search))
+                    {
+                        deviceMatches = false;
+                        break;
+                    }
+                    break;
+                }
+                case nlohmann::json::value_t::boolean:
+                case nlohmann::json::value_t::number_unsigned:
+                {
+                    unsigned int probeValue = boost::apply_visitor(
+                        VariantToUnsignedIntVisitor(), deviceValue->second);
+
+                    if (probeValue != match.second.get<unsigned int>())
+                    {
+                        deviceMatches = false;
+                    }
+                    break;
+                }
+                case nlohmann::json::value_t::number_integer:
+                {
+                    int probeValue = boost::apply_visitor(VariantToIntVisitor(),
+                                                          deviceValue->second);
+
+                    if (probeValue != match.second.get<int>())
+                    {
+                        deviceMatches = false;
+                    }
+                    break;
+                }
+                case nlohmann::json::value_t::number_float:
+                {
+                    float probeValue = boost::apply_visitor(
+                        VariantToFloatVisitor(), deviceValue->second);
+
+                    if (probeValue != match.second.get<float>())
+                    {
+                        deviceMatches = false;
+                    }
+                    break;
+                }
+                }
+            }
+            else
+            {
+                deviceMatches = false;
+                break;
+            }
+        }
+        if (deviceMatches)
+        {
+            devices.emplace_back(
+                boost::container::flat_map<std::string, dbus::dbus_variant>(
+                    device));
+            foundMatch = true;
+            deviceMatches = false; // for next iteration
+        }
+    }
+    return foundMatch;
+}
+
+// default probe entry point, iterates a list looking for specific types to
+// call specific probe functions
+bool probe(
+    const std::vector<std::string> probeCommand,
+    std::vector<boost::container::flat_map<std::string, dbus::dbus_variant>>
+        &foundDevs)
+{
+    const static std::regex command(R"(\((.*)\))");
+    std::smatch match;
+    bool ret = false;
+    bool cur = true;
+    probe_type_codes lastCommand = probe_type_codes::FALSE_T;
+
+    for (auto &probe : probeCommand)
+    {
+        bool foundProbe = false;
+        boost::container::flat_map<const char *, probe_type_codes,
+                                   cmp_str>::const_iterator probeType;
+
+        for (probeType = PROBE_TYPES.begin(); probeType != PROBE_TYPES.end();
+             probeType++)
+        {
+            if (probe.find(probeType->first) != std::string::npos)
+            {
+                foundProbe = true;
+                break;
+            }
+        }
+        if (foundProbe)
+        {
+            switch (probeType->second)
+            {
+            case probe_type_codes::FALSE_T:
+            {
+                return false; // todo, actually evaluate?
+                break;
+            }
+            case probe_type_codes::TRUE_T:
+            {
+                return true; // todo, actually evaluate?
+                break;
+            }
+            /*case probe_type_codes::AND:
+              break;
+            case probe_type_codes::OR:
+              break;
+              // these are no-ops until the last command switch
+              */
+            case probe_type_codes::FOUND:
+            {
+                if (!std::regex_search(probe, match, command))
+                {
+                    std::cerr << "found probe sytax error " << probe << "\n";
+                    return false;
+                }
+                std::string commandStr = *(match.begin() + 1);
+                commandStr = boost::replace_all_copy(commandStr, "'", "");
+                cur = (std::find(PASSED_PROBES.begin(), PASSED_PROBES.end(),
+                                 commandStr) != PASSED_PROBES.end());
+                break;
+            }
+            }
+        }
+        // look on dbus for object
+        else
+        {
+            if (!std::regex_search(probe, match, command))
+            {
+                std::cerr << "dbus probe sytax error " << probe << "\n";
+                return false;
+            }
+            std::string commandStr = *(match.begin() + 1);
+            // convert single ticks and single slashes into legal json
+            commandStr = boost::replace_all_copy(commandStr, "'", R"(")");
+            commandStr = boost::replace_all_copy(commandStr, R"(\)", R"(\\)");
+            auto json = nlohmann::json::parse(commandStr, nullptr, false);
+            if (json.is_discarded())
+            {
+                std::cerr << "dbus command sytax error " << commandStr << "\n";
+                return false;
+            }
+            // we can match any (string, variant) property. (string, string)
+            // does a regex
+            std::map<std::string, nlohmann::json> dbusProbeMap =
+                json.get<std::map<std::string, nlohmann::json>>();
+            auto findStart = probe.find("(");
+            if (findStart == std::string::npos)
+            {
+                return false;
+            }
+            std::string probeInterface = probe.substr(0, findStart);
+            cur =
+                probeDbus(probeInterface, dbusProbeMap, foundDevs, foundProbe);
+        }
+
+        // some functions like AND and OR only take affect after the
+        // fact
+        switch (lastCommand)
+        {
+        case probe_type_codes::AND:
+            ret = cur && ret;
+            break;
+        case probe_type_codes::OR:
+            ret = cur || ret;
+            break;
+        default:
+            ret = cur;
+            break;
+        }
+        lastCommand = probeType != PROBE_TYPES.end()
+                          ? probeType->second
+                          : probe_type_codes::FALSE_T;
+
+        if (!foundProbe)
+        {
+            std::cerr << "Illegal probe type " << probe << "\n";
+            return false;
+        }
+    }
+
+    // probe passed, but empty device
+    // todo: should this be done in main?
+    if (ret && foundDevs.size() == 0)
+    {
+        foundDevs.emplace_back(
+            boost::container::flat_map<std::string, dbus::dbus_variant>());
+    }
+    return ret;
+}
+
+int main(int argc, char **argv)
+{
+    // find configuration files
+    std::vector<fs::path> jsonPaths;
+    if (!find_files(fs::path(CONFIGURATION_DIR), R"(.*\.json)", jsonPaths, 0))
+    {
+        std::cerr << "Unable to find any configuration files in "
+                  << CONFIGURATION_DIR << "\n";
+        return 1;
+    }
+    // setup connection to dbus
+    boost::asio::io_service io;
+    SYSTEM_BUS = std::make_shared<dbus::connection>(io, dbus::bus::system);
+    dbus::DbusObjectServer objServer(SYSTEM_BUS);
+    SYSTEM_BUS->request_name("xyz.openbmc_project.EntityManager");
+
+    std::vector<nlohmann::json> configurations;
+    for (auto &jsonPath : jsonPaths)
+    {
+        std::ifstream jsonStream(jsonPath.c_str());
+        if (!jsonStream.good())
+        {
+            std::cerr << "unable to open " << jsonPath.string() << "\n";
+            continue;
+        }
+        auto data = nlohmann::json::parse(jsonStream, nullptr, false);
+        if (data.is_discarded())
+        {
+            std::cerr << "syntax error in " << jsonPath.string() << "\n";
+            continue;
+        }
+        if (data.type() == nlohmann::json::value_t::array)
+        {
+            for (auto &d : data)
+            {
+                configurations.emplace_back(d);
+            }
+        }
+        else
+        {
+            configurations.emplace_back(data);
+        }
+    }
+
+    // keep looping as long as at least 1 new probe passed, removing
+    // configurations from the memory store once the probe passes
+    bool probePassed = true;
+    nlohmann::json systemConfiguration;
+    while (probePassed)
+    {
+        probePassed = false;
+        for (auto it = configurations.begin(); it != configurations.end();)
+        {
+            bool eraseConfig = false;
+            auto findProbe = (*it).find("probe");
+            auto findName = (*it).find("name");
+
+            // check for poorly formatted fields
+            if (findProbe == (*it).end())
+            {
+                std::cerr << "configuration file missing probe:\n " << *it
+                          << "\n";
+                eraseConfig = true;
+            }
+            if (findName == (*it).end())
+            {
+                std::cerr << "configuration file missing name:\n " << *it
+                          << "\n";
+                eraseConfig = true;
+            }
+
+            nlohmann::json probeCommand;
+            if ((*findProbe).type() != nlohmann::json::value_t::array)
+            {
+                probeCommand = nlohmann::json::array();
+                probeCommand.push_back(*findProbe);
+            }
+            else
+            {
+                probeCommand = *findProbe;
+            }
+            std::vector<
+                boost::container::flat_map<std::string, dbus::dbus_variant>>
+                foundDevices;
+            if (probe(probeCommand, foundDevices))
+            {
+                eraseConfig = true;
+                probePassed = true;
+                PASSED_PROBES.push_back(*findName);
+
+                size_t foundDeviceIdx = 0;
+
+                for (auto &foundDevice : foundDevices)
+                {
+                    auto findExpose = (*it).find("exposes");
+                    if (findExpose == (*it).end())
+                    {
+                        std::cerr
+                            << "Warning, configuration file missing exposes"
+                            << *it << "\n";
+                        continue;
+                    }
+                    for (auto &expose : *findExpose)
+                    {
+                        for (auto keyPair = expose.begin();
+                             keyPair != expose.end(); keyPair++)
+                        {
+                            // fill in template characters with devices
+                            // found
+                            if (keyPair.value().type() ==
+                                nlohmann::json::value_t::string)
+                            {
+                                std::string value = keyPair.value();
+                                if (value.find(TEMPLATE_CHAR) !=
+                                    std::string::npos)
+                                {
+                                    std::string templateValue = value;
+
+                                    templateValue.erase(
+                                        0, 1); // remove template character
+
+                                    // special case index
+                                    if ("index" == templateValue)
+                                    {
+                                        keyPair.value() = foundDeviceIdx;
+                                    }
+                                    else
+                                    {
+                                        std::string subsitute;
+                                        for (auto &foundDevicePair :
+                                             foundDevice)
+                                        {
+                                            if (boost::iequals(
+                                                    foundDevicePair.first,
+                                                    templateValue))
+                                            {
+                                                // convert value to string
+                                                // respresentation
+                                                subsitute =
+                                                    boost::apply_visitor(
+                                                        [](const auto &x) {
+                                                            return boost::
+                                                                lexical_cast<
+                                                                    std::
+                                                                        string>(
+                                                                    x);
+                                                        },
+                                                        foundDevicePair.second);
+                                                break;
+                                            }
+                                        }
+                                        if (!subsitute.size())
+                                        {
+                                            std::cerr << "could not find "
+                                                      << templateValue
+                                                      << " in device "
+                                                      << expose["name"] << "\n";
+                                        }
+                                        else
+                                        {
+                                            keyPair.value() = subsitute;
+                                        }
+                                    }
+                                }
+
+                                // special case bind
+                                if (boost::starts_with(keyPair.key(), "bind_"))
+                                {
+                                    bool foundBind = false;
+                                    std::string bind = keyPair.key().substr(
+                                        sizeof("bind_") - 1);
+                                    for (auto &configuration :
+                                         systemConfiguration)
+                                    {
+                                        auto &configList =
+                                            configuration["exposes"];
+                                        for (auto exposedObjectIt =
+                                                 configList.begin();
+                                             exposedObjectIt !=
+                                             configList.end();)
+                                        {
+                                            std::string foundObjectName =
+                                                (*exposedObjectIt)["name"];
+                                            if (boost::iequals(foundObjectName,
+                                                               value))
+                                            {
+                                                (*exposedObjectIt)["status"] =
+                                                    "okay"; // todo: is this the
+                                                            // right spot?
+                                                expose[bind] =
+                                                    (*exposedObjectIt);
+                                                foundBind = true;
+                                                exposedObjectIt =
+                                                    configList.erase(
+                                                        exposedObjectIt);
+                                                break;
+                                            }
+                                            else
+                                            {
+                                                exposedObjectIt++;
+                                            }
+                                        }
+                                        if (foundBind)
+                                        {
+                                            break;
+                                        }
+                                    }
+                                    if (!foundBind)
+                                    {
+                                        std::cerr << "configuration file "
+                                                     "dependency error, "
+                                                     "could not find bind "
+                                                  << value << "\n";
+                                        return 1;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    systemConfiguration.push_back(*it);
+                    foundDeviceIdx++;
+                }
+            }
+
+            if (eraseConfig)
+            {
+                it = configurations.erase(it);
+            }
+            else
+            {
+                it++;
+            }
+        }
+    }
+    // below here is temporary, to be added to dbus
+    std::ofstream output(std::string(OUTPUT_DIR) + "system.json");
+    output << systemConfiguration.dump(4);
+    output.close();
+
+    auto flat = nlohmann::json::array();
+    for (auto &pair : nlohmann::json::iterator_wrapper(systemConfiguration))
+    {
+        auto value = pair.value();
+        auto exposes = value.find("exposes");
+        if (exposes != value.end())
+        {
+            for (auto &item : *exposes)
+            {
+                flat.push_back(item);
+            }
+        }
+    }
+    output = std::ofstream(std::string(OUTPUT_DIR) + "flattened.json");
+    output << flat.dump(4);
+    output.close();
+
+    return 0;
+}
\ No newline at end of file