diff --git a/src/item_updater.cpp b/src/item_updater.cpp
new file mode 100644
index 0000000..9a08f2e
--- /dev/null
+++ b/src/item_updater.cpp
@@ -0,0 +1,173 @@
+#include "config.h"
+
+#include "item_updater.hpp"
+
+#include <filesystem>
+#include <phosphor-logging/elog-errors.hpp>
+#include <phosphor-logging/log.hpp>
+#include <xyz/openbmc_project/Common/error.hpp>
+
+namespace phosphor
+{
+namespace software
+{
+namespace updater
+{
+namespace server = sdbusplus::xyz::openbmc_project::Software::server;
+namespace fs = std::filesystem;
+
+using namespace sdbusplus::xyz::openbmc_project::Common::Error;
+using namespace phosphor::logging;
+
+void ItemUpdater::createActivation(sdbusplus::message::message& m)
+{
+    using SVersion = server::Version;
+    using VersionPurpose = SVersion::VersionPurpose;
+    namespace msg = sdbusplus::message;
+    namespace variant_ns = msg::variant_ns;
+
+    sdbusplus::message::object_path objPath;
+    std::map<std::string, std::map<std::string, msg::variant<std::string>>>
+        interfaces;
+    m.read(objPath, interfaces);
+
+    std::string path(std::move(objPath));
+    std::string filePath;
+    auto purpose = VersionPurpose::Unknown;
+    std::string version;
+
+    for (const auto& [interfaceName, propertyMap] : interfaces)
+    {
+        if (interfaceName == VERSION_IFACE)
+        {
+            for (const auto& [propertyName, propertyValue] : propertyMap)
+            {
+                if (propertyName == "Purpose")
+                {
+                    // Only process the PSU images
+                    auto value = SVersion::convertVersionPurposeFromString(
+                        variant_ns::get<std::string>(propertyValue));
+
+                    if (value == VersionPurpose::PSU)
+                    {
+                        purpose = value;
+                    }
+                }
+                else if (propertyName == "Version")
+                {
+                    version = variant_ns::get<std::string>(propertyValue);
+                }
+            }
+        }
+        else if (interfaceName == FILEPATH_IFACE)
+        {
+            const auto& it = propertyMap.find("Path");
+            if (it != propertyMap.end())
+            {
+                filePath = variant_ns::get<std::string>(it->second);
+            }
+        }
+    }
+    if ((filePath.empty()) || (purpose == VersionPurpose::Unknown))
+    {
+        return;
+    }
+
+    // Version id is the last item in the path
+    auto pos = path.rfind("/");
+    if (pos == std::string::npos)
+    {
+        log<level::ERR>("No version id found in object path",
+                        entry("OBJPATH=%s", path.c_str()));
+        return;
+    }
+
+    auto versionId = path.substr(pos + 1);
+
+    if (activations.find(versionId) == activations.end())
+    {
+        // Determine the Activation state by processing the given image dir.
+        auto activationState = server::Activation::Activations::Ready;
+
+        fs::path manifestPath(filePath);
+        manifestPath /= MANIFEST_FILE;
+        std::string extendedVersion =
+            (Version::getValue(
+                 manifestPath.string(),
+                 std::map<std::string, std::string>{{"extended_version", ""}}))
+                .begin()
+                ->second;
+
+        auto activation = createActivationObject(
+            path, versionId, extendedVersion, activationState);
+        activations.emplace(versionId, std::move(activation));
+
+        auto versionPtr =
+            createVersionObject(path, versionId, version, purpose, filePath);
+        versions.emplace(versionId, std::move(versionPtr));
+    }
+    return;
+}
+
+void ItemUpdater::erase(std::string versionId)
+{
+    auto it = versions.find(versionId);
+    if (it == versions.end())
+    {
+        log<level::ERR>(("Error: Failed to find version " + versionId +
+                         " in item updater versions map."
+                         " Unable to remove.")
+                            .c_str());
+    }
+    else
+    {
+        versions.erase(versionId);
+    }
+
+    // Removing entry in activations map
+    auto ita = activations.find(versionId);
+    if (ita == activations.end())
+    {
+        log<level::ERR>(("Error: Failed to find version " + versionId +
+                         " in item updater activations map."
+                         " Unable to remove.")
+                            .c_str());
+    }
+    else
+    {
+        activations.erase(versionId);
+    }
+}
+
+void ItemUpdater::deleteAll()
+{
+    // TODO: when PSU's running firmware is implemented, delete all versions
+    // that are not the running firmware.
+}
+
+std::unique_ptr<Activation> ItemUpdater::createActivationObject(
+    const std::string& path, const std::string& versionId,
+    const std::string& extVersion,
+    sdbusplus::xyz::openbmc_project::Software::server::Activation::Activations
+        activationStatus)
+{
+    return std::make_unique<Activation>(bus, path, versionId, extVersion,
+                                        activationStatus);
+}
+
+std::unique_ptr<Version> ItemUpdater::createVersionObject(
+    const std::string& objPath, const std::string& versionId,
+    const std::string& versionString,
+    sdbusplus::xyz::openbmc_project::Software::server::Version::VersionPurpose
+        versionPurpose,
+    const std::string& filePath)
+{
+    auto version = std::make_unique<Version>(
+        bus, objPath, versionId, versionString, versionPurpose, filePath,
+        std::bind(&ItemUpdater::erase, this, std::placeholders::_1));
+    return version;
+}
+
+} // namespace updater
+} // namespace software
+} // namespace phosphor