Change occ control service name

Currently, only thing that OCC controller does is create PassThrough
objects. However, there is a need now to create OCC Status objects
and hence some restructuring is needed to consume that.

Since OCC control now is doing more than one thing, service name is
changed to map to that.

Change-Id: I466979a873d6f14385eb59d0e9d9f3a8b3f95a9b
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>
diff --git a/occ_manager.hpp b/occ_manager.hpp
new file mode 100644
index 0000000..067a6d2
--- /dev/null
+++ b/occ_manager.hpp
@@ -0,0 +1,91 @@
+#pragma once
+
+#include <cstring>
+#include <vector>
+#include <experimental/filesystem>
+#include <functional>
+#include <sdbusplus/bus.hpp>
+#include "occ_pass_through.hpp"
+#include "config.h"
+
+namespace sdbusRule = sdbusplus::bus::match::rules;
+
+namespace open_power
+{
+namespace occ
+{
+
+/** @class Manager
+ *  @brief Builds and manages OCC objects
+ */
+struct Manager
+{
+    public:
+        Manager() = delete;
+        Manager(const Manager&) = delete;
+        Manager& operator=(const Manager&) = delete;
+        Manager(Manager&&) = default;
+        Manager& operator=(Manager&&) = default;
+        ~Manager() = default;
+
+        /** @brief Ctor - Add OCC pass-through objects on the bus. Create
+         *         OCC objects when corresponding CPU inventory is created.
+         *  @param[in] bus - handle to the bus
+         */
+        Manager(sdbusplus::bus::bus& bus):
+            bus(bus)
+        {
+            for (auto id = 0; id < MAX_CPUS; ++id)
+            {
+                auto path = std::string(CPU_PATH) + std::to_string(id);
+                cpuMatches.emplace_back(
+                    bus,
+                    sdbusRule::interfacesAdded() +
+                    sdbusRule::argNpath(0, path),
+                    std::bind(std::mem_fn(&Manager::cpuCreated),
+                              this, std::placeholders::_1));
+            }
+        }
+
+        /** @brief Callback that responds to cpu creation in the inventory -
+         *         by creating the occ passthrough and status objects.
+         *
+         *  @param[in] msg - bus message
+         *
+         *  @returns 0 to indicate success
+         */
+        int cpuCreated(sdbusplus::message::message& msg)
+        {
+            namespace fs = std::experimental::filesystem;
+
+            sdbusplus::message::object_path o;
+            msg.read(o);
+            fs::path cpuPath(std::string(std::move(o)));
+            auto cpu = cpuPath.filename();
+
+            std::string name{cpu.c_str()};
+            auto index = name.find(CPU_NAME);
+            name.replace(index, std::strlen(CPU_NAME), OCC_NAME);
+
+            auto path = fs::path(OCC_CONTROL_ROOT) / name;
+            objects.emplace_back(
+                std::make_unique<PassThrough>(
+                    bus,
+                    path.c_str()));
+
+            return 0;
+        }
+
+    private:
+        /** @brief reference to the bus */
+        sdbusplus::bus::bus& bus;
+
+        /** @brief OCC pass-through objects */
+        std::vector<std::unique_ptr<PassThrough>> objects;
+
+        /** @brief sbdbusplus match objects */
+        std::vector<sdbusplus::bus::match_t> cpuMatches;
+};
+
+} // namespace occ
+} // namespace open_power