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+- Start Date: 2024-10-10
+- CppMicroServices PR: https://github.com/CppMicroServices/CppMicroServices/pull/1044
+
+# Add an free API in that can retrieve a <code>ServiceReference</code> from a <code>std::shared_ptr\<T\></code> given to the client by the framework
+
+## Summary
+
+Currently there is no API in the <code>cppmicroservices</code> namespace that can retrieve a <code>ServiceReference</code> from the <code>std::shared_ptr\<T\></code> itself.
+This document discusses need for such API in the particular use case of declarative services (DS) and its possible design/solution.
+
+## Motivation
+
+Developers using DS rely on DS's SCR (service component runtime) to inject services statically at construction or dynamically using the <code>bind</code> and <code>unbind</code> methods. These <code>std::shared_ptr\<T\></code>s can then be used by the client. However, clients often use properties in the Service to store metadata relevant to that service. Those properties, however, are not available to the <code>std::shared_ptr\<T\></code> itself, only via its <code>ServiceReference</code>.
+
+Given this it seems appropriate to have a new method that the client can use to translate a <code>std::shared_ptr\<T\></code> into its <code>ServiceReference</code>.
+
+## Requirements
+
+This API must:
+
+1. take in a <code>ServiceObject\<T\></code> and return the <code>ServiceReference\<T\></code> for that service where <code>T</code> is any class interface
+2. not expose internal implementation details to the user
+
+## Detailed design
+
+<code>ServiceReferenceFromService</code> API will be declared in the file <i>framework/include/cppmicroservices/ServiceReference.h</i> in the namespace <code><bold>cppmicroservices::</bold></code> as below:
+
+```c++
+
+/**
+* \ingroup MicroServices
+* \ingroup gr_servicereference
+*
+* A method to retrieve a <code>ServiceObject</code>'s original <code>ServiceReference<void></code>
+*
+*/
+US_Framework_EXPORT ServiceReferenceU ServiceReferenceFromService(std::shared_ptr<void> const& s);
+
+/**
+* \ingroup MicroServices
+* \ingroup gr_servicereference
+*
+* A method to retrieve a <code>ServiceObject<T></code>'s original <code>ServiceReference<U></code>
+*
+* @tparam T The class type of the <code>ServiceObject</code>
+* @tparam U The class type of the <code>ServiceReference</code>. Defaults to <code>T</code> if not specified.
+*/
+template <typename T, typename U = T>
+ServiceReference<U>
+ServiceReferenceFromService(std::shared_ptr<T> const& s)
+{
+    return ServiceReference<U>(ServiceReferenceFromService(std::static_pointer_cast<void>(s)));
+}
+
+```
+
+This API will take the <code>std::shared_ptr\<T\></code> and first verify that it was a <code>std::shared_ptr\<T\></code> created by the CppMicroServices framework.
+
+If it is valid, it will return the original <code>ServiceReference</code> for that <code>std::shared_ptr\<T\></code>.
+
+A typical usage workflow could be as below, in the static constructor of a service <code>ServiceImpl</code> which depends on a service of type <code>ServiceInterface2</code>.
+
+```c++
+ServiceImpl::ServiceImpl(std::shared_ptr<ServiceInterface2> const& dep) {
+    // get the reference
+    ServiceReference<ServiceInterface2> depRef = cppmicroservices::ServiceReferenceFromService(dep);
+    // get a property from the ServiceReference's metadata
+    auto someProp = cppmicroservices::any_cast<std::string>(retSRef.GetProperty("someProp"));
+    // use that property
+    doSomethingWith(someProp);
+}
+
+```
+
+## Implementation
+
+In order to solve this problem, we have to somehow embed metadata into the <code>std::shared_ptr\<T\></code> about its <code>ServiceReference</code> in a way that is inaccessible directly by clients.
+
+One solution that we have found is to embed a custom deleter into the <code>std::shared_ptr\<ServiceHolder\></code> and retrieve that using the <code>std::get_deleter</code> functionality.
+
+The objects that would allow this can be seen below:
+
+```c++
+
+/* @brief Private helper struct used to facilitate the shared_ptr aliasing constructor
+    *        in BundleContext::GetService method. The aliasing constructor helps automate
+    *        the call to UngetService method.
+    *
+    *        Service consumers can simply call GetService to obtain a shared_ptr to the
+    *        service object and not worry about calling UngetService when they are done.
+    *        The UngetService is called when all instances of the returned shared_ptr object
+    *        go out of scope.
+    */
+template <class S>
+struct ServiceHolder
+{
+    bool singletonService;
+    std::weak_ptr<BundlePrivate> const b;
+    ServiceReferenceBase const sref;
+    std::shared_ptr<S> const service;
+    InterfaceMapConstPtr const interfaceMap;
+
+    ServiceHolder(ServiceHolder&) = default;
+    ServiceHolder(ServiceHolder&&) noexcept = default;
+    ServiceHolder& operator=(ServiceHolder&) = delete;
+    ServiceHolder& operator=(ServiceHolder&&) noexcept = delete;
+
+    ServiceHolder(std::shared_ptr<BundlePrivate> const& b,
+                    ServiceReferenceBase const& sr,
+                    std::shared_ptr<S> s,
+                    InterfaceMapConstPtr im)
+        : singletonService(s ? true : false)
+        , b(b)
+        , sref(sr)
+        , service(std::move(s))
+        , interfaceMap(std::move(im))
+    {
+    }
+
+    ~ServiceHolder()
+    {
+        try
+        {
+            singletonService ? destroySingleton() : destroyPrototype();
+        }
+        catch (...)
+        {
+            // Make sure that we don't crash if the shared_ptr service object outlives
+            // the BundlePrivate or CoreBundleContext objects.
+            if (!b.expired())
+            {
+                DIAG_LOG(*b.lock()->coreCtx->sink)
+                    << "UngetService threw an exception. " << util::GetLastExceptionStr();
+            }
+            // don't throw exceptions from the destructor. For an explanation, see:
+            // https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md
+            // Following this rule means that a FrameworkEvent isn't an option here
+            // since it contains an exception object which clients could throw.
+        }
+    }
+
+    private:
+    void
+    destroySingleton()
+    {
+        sref.d.Load()->UngetService(b.lock(), true);
+    }
+
+    void
+    destroyPrototype()
+    {
+        auto bundle = b.lock();
+        if (sref)
+        {
+            bool isPrototypeScope
+                = sref.GetProperty(Constants::SERVICE_SCOPE).ToString() == Constants::SCOPE_PROTOTYPE;
+
+            if (isPrototypeScope)
+            {
+                sref.d.Load()->UngetPrototypeService(bundle, interfaceMap);
+            }
+            else
+            {
+                sref.d.Load()->UngetService(bundle, true);
+            }
+        }
+    }
+};
+
+/* @brief Private helper struct used to facilitate the retrieval of a serviceReference from
+    *        a serviceObject.
+    *
+    *        Service consumers can pass a service to the public API ServiceReferenceFromService.
+    *        This method can use the std::get_deleter method to retrieve this object and through
+    *        it the original serviceReference.
+    */
+class CustomServiceDeleter
+{
+    public:
+    CustomServiceDeleter(ServiceHolder<void>* sh) : sHolder(sh) {}
+
+    void
+    operator()(ServiceHolder<void>* sh)
+    {
+        delete sh;
+    }
+
+    [[nodiscard]] ServiceReferenceBase
+    getServiceRef() const
+    {
+        return sHolder->sref;
+    }
+
+    private:
+    ServiceHolder<void> const* const sHolder;
+};
+
+ServiceReferenceU
+ServiceReferenceFromService(std::shared_ptr<void> const& s)
+{
+    auto deleter = std::get_deleter<CustomServiceDeleter>(s);
+    if (!deleter)
+    {
+        throw std::runtime_error("The input is not a CppMicroServices managed ServiceObject");
+    }
+    return deleter->getServiceRef();
+}
+```
+
+The new way that <code>ServiceHolder</code> objects would be constructed can be seen below:
+
+```c++
+// For a Singleton object (from framework/src/Bundle/BundleContext.cpp)
+auto serviceHolder = new ServiceHolder<void>(b, reference, reference.d.Load()->GetService(b.get()), nullptr);
+std::shared_ptr<ServiceHolder<void>> h(serviceHolder, CustomServiceDeleter { serviceHolder });
+return std::shared_ptr<void>(h, h->service.get());
+
+// For a prototype object (from framework/src/service/ServiceObjects.cpp)
+auto sh = new ServiceHolder<void> { bundle_, d->m_reference, nullptr, result };
+std::shared_ptr<ServiceHolder<void>> h(sh, CustomServiceDeleter { sh });
+return InterfaceMapConstPtr(h, h->interfaceMap.get());
+```
+
+## How we teach this
+
+If the proposal is accepted, the CppMicroServices doxygen guide will be modified to reflect the new functionality.
+Most clients will not need this functionality. Configurations can be injected into DS services using ConfigAdmin.
+
+## Drawbacks
+
+- We are using custom deleters in a way that they were not intended to be used.