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DI: draft configuration for using a service implementation created elsewhere

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This commit is contained in:
Fischlurch 2018-03-18 02:11:46 +01:00
parent 9f93154f62
commit 5516700523
2 changed files with 93 additions and 8 deletions
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80
research/try.cpp
View file

@ -200,6 +200,24 @@ class DependInject
Depend<SRV>::factory = Depend<SRV>::disabledFactory;
}
static void
activateServiceAccess (SRV& newInstance)
{
ClassLock<SRV> guard;
if (Depend<SRV>::instance)
throw error::Logic("Attempt to activate an external service implementation, "
"but another instance has already been dependency-injected."
, error::LUMIERA_ERROR_LIFECYCLE);
Depend<SRV>::instance = &newInstance;
}
static void
deactivateServiceAccess()
{
ClassLock<SRV> guard;
Depend<SRV>::instance = nullptr;
}
template<class SUB>
@ -214,13 +232,42 @@ class DependInject
});
}
template<class IMP>
class ServiceInstance
{
std::unique_ptr<IMP> instance_;
public:
ServiceInstance()
: instance_(new IMP{})
{
activateServiceAccess (*instance_);
}
~ServiceInstance()
{
deactivateServiceAccess();
}
explicit
operator bool() const
{
return bool(instance_);
}
IMP&
operator* () const
{
ENSURE (instance_);
return *instance_;
}
IMP*
operator-> () const
{
ENSURE (instance_);
return instance_.get();
}
};
@ -256,7 +303,7 @@ struct Dummy
~Dummy() { checksum -= N; cout << "~Dummy<"<<N<<">"<<endl;}
virtual int
probe()
probe() override
{
return N * checksum;
}
@ -290,6 +337,35 @@ main (int, char**)
SHOW_EXPR( Depend<Dum>{}().probe() );
SHOW_EXPR( checksum );
struct SubDummy
: Dummy<3>
{
virtual int
probe() override
{
return -checksum + offset;
}
int offset = 0;
};
Depend<Dummy<3>> dep3;
SHOW_EXPR( checksum );
{
DependInject<Dummy<3>>::ServiceInstance<SubDummy> service{};
CHECK (service);
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
service->offset = 5;
SHOW_EXPR( dep3().probe() );
SHOW_EXPR( checksum );
}
SHOW_EXPR( checksum );
SHOW_EXPR( dep3().probe() );
VERIFY_ERROR (LIFECYCLE, DependInject<Dum>::ServiceInstance<SubDummy>{} );
SHOW_EXPR( checksum );
cout << "\n.gulp.\n";

21
wiki/thinkPad.ichthyo.mm
View file

@ -26807,8 +26807,10 @@
</node>
<node CREATED="1521208257336" ID="ID_1129640741" MODIFIED="1521208261323" TEXT="ServiceInstance">
<node CREATED="1521208859989" ID="ID_549061661" MODIFIED="1521208874756" TEXT="Lazy-Init-Factory deaktivieren"/>
<node CREATED="1521208793630" ID="ID_1357481546" MODIFIED="1521208825093" TEXT="Service-Zugang in Depend&lt;Bla&gt; injizieren"/>
<node CREATED="1521208889297" ID="ID_214019029" MODIFIED="1521208932875" TEXT="Lebenszyklus-Koppelung">
<node COLOR="#338800" CREATED="1521208793630" ID="ID_1357481546" MODIFIED="1521335430941" TEXT="Service-Zugang in Depend&lt;Bla&gt; injizieren">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521208889297" ID="ID_214019029" MODIFIED="1521335434588" TEXT="Lebenszyklus-Koppelung">
<richcontent TYPE="NOTE"><html>
<head>
@ -26823,9 +26825,14 @@
</body>
</html>
</richcontent>
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521208943105" ID="ID_295121984" MODIFIED="1521335440371" TEXT="Ownership an &#xfc;bergebener Service-Impl &#xfc;bernehmen">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521208724943" ID="ID_1527628667" MODIFIED="1521335442003" TEXT="smart-ptr-artiger Zugriff auf die Service-Impl">
<icon BUILTIN="button_ok"/>
</node>
<node CREATED="1521208943105" ID="ID_295121984" MODIFIED="1521208976657" TEXT="Ownership an &#xfc;bergebener Service-Impl &#xfc;bernehmen"/>
<node CREATED="1521208724943" ID="ID_1527628667" MODIFIED="1521208881882" TEXT="smart-ptr-artiger Zugriff auf die Service-Impl"/>
</node>
<node CREATED="1521208261887" ID="ID_384054163" MODIFIED="1521208264827" TEXT="Local">
<node CREATED="1521209044203" ID="ID_1994153994" MODIFIED="1521209058181" TEXT="Closure &#xfc;ber konkreten Ctor"/>
@ -27006,7 +27013,7 @@
</node>
<node COLOR="#338800" CREATED="1521324229082" ID="ID_1398878858" MODIFIED="1521326553373" TEXT="Storage">
<icon BUILTIN="button_ok"/>
<node CREATED="1521324240124" ID="ID_1099103129" MODIFIED="1521324253936">
<node CREATED="1521324240124" ID="ID_1099103129" MODIFIED="1521333223154">
<richcontent TYPE="NODE"><html>
<head>
@ -27018,8 +27025,10 @@
</body>
</html>
</richcontent>
<icon BUILTIN="ksmiletris"/>
</node>
<node CREATED="1521324275919" ID="ID_1710451095" MODIFIED="1521324497413" TEXT="sehe aber auch keinen wirklichen Vorteil">
<node CREATED="1521324275919" ID="ID_1710451095" MODIFIED="1521333231077" TEXT="sehe aber auch keinen wirklichen Vorteil">
<icon BUILTIN="smiley-neutral"/>
<node CREATED="1521324529228" ID="ID_1786667023" MODIFIED="1521324543094" TEXT="man mu&#xdf; sich nicht um die de-Allokation k&#xfc;mmern"/>
<node CREATED="1521324554465" ID="ID_1577416641" MODIFIED="1521324568043" TEXT="Storage ist garantiert vorhanden, kein out-of-Memory"/>
<node CREATED="1521324668449" ID="ID_1013908061" MODIFIED="1521324682434" TEXT="Meyers Singleton ist elegant und schnell"/>