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Class ILLIXR::phonebook

ClassList > ILLIXR > phonebook

A service locator forILLIXR .More...

  • #include <phonebook.hpp>

Classes

Type Name
class service
A 'service' that can be registered in the phonebook.

Public Functions

Type Name
bool has_impl () const
std::shared_ptr< Specific_service > lookup_impl () const
Look up an implementation of Specific_service , which should be registered first.
void register_impl (std::shared_ptr< Specific_service > impl)
Registers an implementation of baseclass for future calls to lookup.

Detailed Description

This will be explained through an example: Suppose one dynamically-loaded plugin, A_plugin, needs a service, B_service, provided by another, B_plugin. A_plugin cannot statically construct a B_service, because the implementation B_plugin is dynamically loaded. However, B_plugin can register an implementation of B_service when it is loaded, and A_plugin can lookup that implementation without knowing it.

B_service.hpp in common: 

class B_service {
public:
    virtual void frobnicate(foo data) = 0;
};

B_plugin.hpp: 

class B_impl : public B_service {
public:
    virtual void frobnicate(foo data) {
        // ...
    }
};
void blah_blah(phonebook* pb) {
    // Expose `this` as the "official" implementation of `B_service` for this run.
    pb->register_impl<B_service>(std::make_shared<B_impl>());
}

A_plugin.cpp: 

#include "B_service.hpp"
void blah_blah(phonebook* pb) {
    B_service* b = pb->lookup_impl<B_service>();
    b->frobnicate(data);
}

If the implementation of B_service is not known to A_plugin (the usual case), B_service should be an [abstract class][2]. In either caseB_serviceshould be incommon`, so both plugins can refer to it.

One could even selectively return a different implementation of B_service depending on the caller (through the parameters), but we have not encountered the need for that yet.

Public Functions Documentation

function has_impl

template<typename specific_service>
inline bool ILLIXR::phonebook::has_impl () const

function lookup_impl

Look up an implementation of Specific_service , which should be registered first. 

template<typename Specific_service>
inline std::shared_ptr< Specific_service > ILLIXR::phonebook::lookup_impl () const

Safe to be called from any thread.

Do not call delete on the returned object; it is still managed by phonebook.

Exception:

  • if an implementation is not already registered.

function register_impl

Registers an implementation of baseclass for future calls to lookup. 

template<typename Specific_service>
inline void ILLIXR::phonebook::register_impl (
    std::shared_ptr< Specific_service > impl
)

Safe to be called from any thread.

The implementation will be owned by phonebook (phonebook calls delete).

The documentation for this class was generated from the following file /home/friedel/devel/ILLIXR/include/illixr/phonebook.hpp