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DI: (WIP) switch to totally rewritten new implementation of lib::Depend (#1086)

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- state-of-the-art implementation of access with Double Checked Locking + Atomics
- improved design for configuration of dependencies. Now at the provider, not the consumer
- support for exposing services with a lifecycle through the lib::Depend<SRV> front-end
This commit is contained in:
Fischlurch 2018-03-30 18:46:13 +02:00
parent 043dc948e3
commit 80207ea224
19 changed files with 105 additions and 131 deletions
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2
research/try.cpp
View file

@ -50,7 +50,7 @@
typedef unsigned int uint;
#include "lib/format-cout.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include "lib/depend-inject.hpp"
//#include "lib/meta/util.hpp"
#include "lib/test/test-helper.hpp"

52
src/lib/depend-inject.hpp
View file

@ -28,18 +28,18 @@
** plants an instance of lib::Depend, templated to the actual type of the dependency.
** This is a way to express the dependency on some interface or service, while not
** expanding on any details as to when and how this dependency is created. Without
** and explicit configuration, lib::Depend will automatically create and manage a
** an explicit configuration, lib::Depend will automatically create and manage a
** singleton instance of the type given as type parameter.
**
** ## Architecture
** A _dependency_ is understood as something we need to do the task at hand, yet
** a dependency lies beyond that task and relates to concerns outside the scope
** and theme of this actual task. The usage site of the dependency is only bound
** and coupled to the _interface_ exposed as dependency, and the associated
** A _dependency_ is understood as something we need to perform the task at hand,
** yet a dependency referres beyond that task and relates to concerns outside the
** scope and theme of this actual task. The usage site of the dependency is only
** bound and coupled to the _interface_ exposed as dependency, and the associated
** _contract_ of a service. Initially, such a dependency is _dormant_ and will
** be activated on first access. This simplifies the bootstrap of complex
** be activated on first access. This simplifies the bootstrap of complexly
** interwoven structures; it suffices to ensure that none of the participating
** entities actually starts to work before all of the setup and wiring is done.
** entities actually starts its work before all of the setup and wiring is done.
**
** For that reason, lib::DependInject<SRV> is meant to be used at the site providing
** the _actual_ service or implementation subtype -- not at the site consuming a
@ -56,7 +56,7 @@
** function, a functor or lambda can be installed into the static factory of lib::Depend.
** Especially, a lambda could be bound into the internal context of the service provider.
** This function is expected to deliver a heap allocated instance on invocation, which
** will be owned and managed by lib::Depend<SRV>::singleton (An InstanceHolder<SRV>).
** will be owned and managed by lib::Depend<SRV>::factory (A DependencyFactory<SRV>).
**
** \paragraph Service Lifecycle
** Whenever a module or subsystem can be started and stopped, several interconnected
@ -117,7 +117,7 @@
#include "lib/error.hpp"
#include "lib/nocopy.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include "lib/meta/trait.hpp"
#include "lib/meta/function.hpp"
#include "lib/sync-classlock.hpp"
@ -139,9 +139,9 @@ namespace lib {
/**
* This framework allows to (re)configure the lib::Depend front-end for dependency-injection.
* By default, `Depend<TY>` will create a singleton instance of `TY` lazily, on demand.
* When instantiating one of the configuration handles provided here -- _prior_ to using
* When instantiating one of the configuration handles provided here -- _prior_ to anyone
* retrieving the instance through `Depend<TY>` -- this default (singleton) behaviour
* can be reconfigured in various ways, without the client being aware of it
* can be reconfigured in various ways, without the client being aware of it:
* - instead of a singleton, a service instance with well defined lifecycle can be
* exposed through the `Depend<TY>` front-end. When the service is shut down,
* clients will receive an exception on access.
@ -150,6 +150,7 @@ namespace lib {
* singleton type, which still happens lazily, on demand
* - the current state and configuration can be shadowed temporarily by a test mock instance,
* which is managed automatically and removed when leaving the scope of the test.
* @note DependInject<SRV> is declared fried by Depend<SRV> to reconfigure the latter's internals
*/
template<class SRV>
class DependInject
@ -159,7 +160,7 @@ namespace lib {
using Lock = typename Depend<SRV>::Lock;
public:
/** configure dependency-injection for type SRV to build a subclass singleton
/** configure dependency-injection for type SRV to build a subclass singleton.
* @note actually a delegation to `Depend<SUB>` is installed into `Depend<SRV>`
* @tparam SUB concrete subclass type to build on demand when invoking `Depend<SRV>`
* @throws error::Logic (LUMIERA_ERROR_LIFECYCLE) when the default factory has already
@ -174,19 +175,19 @@ namespace lib {
}
/** configure dependency-injection for type SRV to manage a subclass singleton,
* which is created lazily on demand by invoking the given builder function
* which is created lazily on demand by invoking the given builder function.
* @note actual Subclass type is determined from the given functor and then
* a delegation to `Depend<Subclass>` is installed into `Depend<SRV>`
* @param ctor functor to create a heap allocated instance of subclass
* @param ctor functor to create a heap allocated instance of the subclass
* @throws error::Logic (LUMIERA_ERROR_LIFECYCLE) when the default factory has already
* been invoked at the point when calling this (re)configuration function.
*/
template<class FUN>
static void
useSingleton(FUN&& ctor)
useSingleton (FUN&& ctor)
{
using Fun = typename SubclassFactoryType<FUN>::Fun;
using Sub = typename SubclassFactoryType<FUN>::Sub;
using Sub = typename SubclassFactoryType<FUN>::Subclass;
using Fun = typename SubclassFactoryType<FUN>::Functor;
__assert_compatible<Sub>();
installFactory<Sub,Fun> (forward<FUN> (ctor));
@ -214,7 +215,7 @@ namespace lib {
public:
template<typename...ARGS>
ServiceInstance(ARGS&& ...ctorArgs)
: instance_(new IMP(forward<ARGS> (ctorArgs)...))
: instance_{new IMP(forward<ARGS> (ctorArgs)...)}
{
__assert_compatible<IMP>();
activateServiceAccess (*instance_);
@ -239,7 +240,7 @@ namespace lib {
}
IMP*
operator-> () const
operator->() const
{
ENSURE (instance_);
return instance_.get();
@ -274,7 +275,7 @@ namespace lib {
Local (FUN&& buildInstance)
{
__assert_compatible<MOC>();
__assert_compatible<typename SubclassFactoryType<FUN>::Sub>();
__assert_compatible<typename SubclassFactoryType<FUN>::Subclass>();
temporarilyInstallAlternateFactory (origInstance_, origFactory_
,[=]()
@ -341,11 +342,11 @@ namespace lib {
static_assert (meta::_Fun<FUN>(),
"Need a Lambda or Function object to create a heap allocated instance");
using Fun = typename meta::_Fun<FUN>::Functor; // suitable type to store for later invocation
using Res = typename meta::_Fun<FUN>::Ret;
using Sub = typename meta::Strip<Res>::TypePlain;
using Functor = typename meta::_Fun<FUN>::Functor; // suitable type to store for later invocation
using ResultVal = typename meta::_Fun<FUN>::Ret;
using Subclass = typename meta::Strip<ResultVal>::TypePlain;
static_assert (std::is_pointer<Res>::value,
static_assert (std::is_pointer<ResultVal>::value,
"Function must yield a pointer to a heap allocated instance");
};
@ -378,6 +379,7 @@ namespace lib {
__ensure_pristine();
Depend<SRV>::factory.defineCreator ([]{ return & Depend<SUB>{}(); });
}
// note: we do not install an actual factory; rather we use the default for SUB
}
@ -424,4 +426,4 @@ namespace lib {
} // namespace lib
#endif
#endif /*LIB_DEPEND_INJECT_H*/

6
src/lib/depend2.hpp → src/lib/depend.hpp
View file

@ -85,8 +85,8 @@
*/
#ifndef WIP_LIB_DEPEND_H
#define WIP_LIB_DEPEND_H
#ifndef LIB_DEPEND_H
#define LIB_DEPEND_H
#include "lib/error.hpp"
@ -324,4 +324,4 @@ namespace lib {
} // namespace lib
#endif
#endif /*LIB_DEPEND_H*/

2
tests/core/backend/media-access-mock-test.cpp
View file

@ -27,7 +27,7 @@
#include "backend/media-access-facade.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "lib/format-cout.hpp"
#include "lib/test/run.hpp"

2
tests/core/proc/asset/create-asset-test.cpp
View file

@ -35,7 +35,7 @@
#include "proc/asset/asset-diagnostics.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
using lib::test::Depend4Test;
using util::isnil;

2
tests/core/proc/asset/dependent-assets-test.cpp
View file

@ -29,7 +29,7 @@
#include "proc/asset/testasset.hpp"
#include "proc/asset/asset-diagnostics.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "proc/asset/media.hpp"
#include "proc/asset/clip.hpp"
#include "lib/util.hpp"

2
tests/core/proc/asset/identity-of-assets-test.cpp
View file

@ -35,7 +35,7 @@
#include "proc/asset/asset-diagnostics.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
using lib::test::Depend4Test;
using util::isnil;

2
tests/core/proc/asset/make-clip-test.cpp
View file

@ -35,7 +35,7 @@
#include "proc/mobject/session/clip.hpp"
#include "proc/asset/asset-diagnostics.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
using lib::test::Depend4Test;
using util::contains;

2
tests/core/proc/asset/ordering-of-assets-test.cpp
View file

@ -34,7 +34,7 @@
#include "proc/asset/asset-diagnostics.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
using lib::test::Depend4Test;
using util::isnil;

3
tests/core/proc/mobject/builder/builder-tool-test.cpp
View file

@ -34,13 +34,12 @@
#include "proc/mobject/session/clip.hpp"
#include "proc/mobject/test-dummy-mobject.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "lib/format-cout.hpp"
#include "lib/util.hpp"
using util::cStr;
using std::string;
using std::cout;

2
tests/core/proc/mobject/mobject-interface-test.cpp
View file

@ -40,7 +40,7 @@
//#include "proc/mobject/explicitplacement.hpp"
#include "proc/mobject/test-dummy-mobject.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "lib/time/timevalue.hpp"
#include "lib/format-cout.hpp"

2
tests/core/proc/mobject/mobject-ref-test.cpp
View file

@ -37,7 +37,7 @@
#include "proc/mobject/explicitplacement.hpp"
#include "proc/mobject/test-dummy-mobject.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "lib/test/test-helper.hpp"
#include "lib/time/timevalue.hpp"
#include "lib/format-cout.hpp"

2
tests/core/proc/mobject/placement-hierarchy-test.cpp
View file

@ -27,7 +27,7 @@
#include "lib/test/run.hpp"
#include "lib/test/test-helper.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "backend/media-access-mock.hpp"
#include "proc/mobject/test-dummy-mobject.hpp"
#include "proc/mobject/session/clip.hpp"

2
tests/core/proc/mobject/session/testclip.cpp
View file

@ -28,7 +28,7 @@
#include "proc/mobject/session/testclip.hpp"
#include "backend/media-access-facade.hpp"
#include "backend/media-access-mock.hpp"
#include "lib/test/depend-4test.hpp"
#include "lib/depend-inject.hpp"
#include "proc/asset/media.hpp"
#include "proc/asset/clip.hpp"
#include "lib/depend.hpp"

2
tests/library/dependency-configuration-test.cpp
View file

@ -34,7 +34,7 @@
#include "lib/test/test-helper.hpp"
#include "lib/util.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include "lib/depend-inject.hpp"

2
tests/library/dependency-factory-test.cpp
View file

@ -33,7 +33,7 @@
#include "lib/format-obj.hpp"
#include "lib/util.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include "lib/depend-inject.hpp"
#include "test-target-obj.hpp"

2
tests/library/singleton-subclass-test.cpp
View file

@ -32,7 +32,7 @@
#include "lib/util.hpp"
#include "test-target-obj.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include "lib/depend-inject.hpp"
#include <boost/lexical_cast.hpp>

2
tests/library/singleton-test.cpp
View file

@ -31,7 +31,7 @@
#include "lib/util.hpp"
#include "test-target-obj.hpp"
#include "lib/depend2.hpp"
#include "lib/depend.hpp"
#include <boost/lexical_cast.hpp>

145
wiki/thinkPad.ichthyo.mm
View file

@ -26507,8 +26507,7 @@
</li>
</ul>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="yes"/>
</node>
<node COLOR="#338800" CREATED="1521843907144" ID="ID_848033940" MODIFIED="1521843935500" TEXT="Ergebnis normieren auf einzelnen Aufruf">
@ -26527,8 +26526,7 @@
habe einen usleep(1000) getimed
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="button_ok"/>
</node>
</node>
@ -26561,8 +26559,7 @@
Au&#223;erdem ist ja auch noch der Aufruf des Funktors mit im Spiel, wenngleich der auch typischerweise geinlined wird
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1521844236539" ID="ID_176799135" MODIFIED="1521844248411" TEXT="tats&#xe4;chlich verifiziert">
<icon BUILTIN="idea"/>
@ -26583,8 +26580,7 @@
volatile Variable <i>au&#223;en,</i>&#160;im Aufrufkontext
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1521844366944" ID="ID_1258575129" MODIFIED="1521844373484" TEXT="Zugriff via Closure und Referenz"/>
<node CREATED="1521844374503" ID="ID_1548234021" MODIFIED="1521844386090" TEXT="diese Variable mit Konstante vergleichen"/>
@ -26603,8 +26599,7 @@
da&#223; x86_64 tats&#228;chlich cache-koh&#228;rent ist
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
</node>
@ -26869,15 +26864,25 @@
</node>
</node>
</node>
<node CREATED="1520722136029" ID="ID_1922898574" MODIFIED="1520722144366" TEXT="Problem: double checked locking">
<node COLOR="#338800" CREATED="1520722136029" ID="ID_1922898574" MODIFIED="1522421599316" TEXT="Problem: double checked locking">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1520725664365" ID="ID_1453945091" MODIFIED="1520725671423" TEXT="was bringt C++11?">
<node CREATED="1520725673123" ID="ID_574000501" LINK="http://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/" MODIFIED="1520726129608" TEXT="Jeff Preshings: double-checked-locking-is-fixed-in-cpp11"/>
<node CREATED="1520726409894" ID="ID_1296403824" LINK="http://www.modernescpp.com/index.php/thread-safe-initialization-of-a-singleton" MODIFIED="1520726425377" TEXT="Rainer Grimm: thread local initialization of singletons"/>
</node>
<node CREATED="1520726342863" ID="ID_1875729983" MODIFIED="1520726350066" TEXT="moderne L&#xf6;sung">
<node CREATED="1520726350894" ID="ID_47446040" MODIFIED="1520726354025" TEXT="Atomics"/>
<node CREATED="1520726354878" ID="ID_1241761015" MODIFIED="1520726363168" TEXT="vorgeschaltetes thread_local">
<node COLOR="#338800" CREATED="1520726342863" FOLDED="true" ID="ID_1875729983" MODIFIED="1522421593574" TEXT="moderne L&#xf6;sung">
<icon BUILTIN="button_ok"/>
<node CREATED="1520726350894" ID="ID_47446040" MODIFIED="1522421521283" TEXT="Atomics">
<icon BUILTIN="button_ok"/>
<node CREATED="1522421526272" ID="ID_406901713" MODIFIED="1522421532577" TEXT="Performance sehr gut"/>
<node CREATED="1522421537122" ID="ID_1012365029" MODIFIED="1522421553659" TEXT="nahe an einem direkten lokalen Zugriff"/>
<node CREATED="1522421554271" ID="ID_1930807074" MODIFIED="1522421564034" TEXT="etwa halb so schnell wie DCL alleine"/>
<node CREATED="1522421564582" ID="ID_596046075" MODIFIED="1522421575992" TEXT="Zugriff etwa 1 Nanosekunde">
<icon BUILTIN="info"/>
</node>
</node>
<node CREATED="1520726354878" ID="ID_1241761015" MODIFIED="1522421518773" TEXT="vorgeschaltetes thread_local">
<icon BUILTIN="button_cancel"/>
<node CREATED="1520726364612" ID="ID_818685184" MODIFIED="1520726369804" TEXT="Performance nicht klar">
<icon BUILTIN="messagebox_warning"/>
</node>
@ -27433,8 +27438,7 @@
<u>Thema</u>: Memory access order constraints
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<arrowlink COLOR="#5a6caa" DESTINATION="ID_1416813337" ENDARROW="Default" ENDINCLINATION="-1755;162;" ID="Arrow_ID_751165448" STARTARROW="None" STARTINCLINATION="-4287;-237;"/>
<icon BUILTIN="info"/>
<node CREATED="1521783335195" ID="ID_594004742" LINK="http://en.cppreference.com/w/cpp/atomic/memory_order" MODIFIED="1521783351104" TEXT="CPP-Reference"/>
@ -27449,8 +27453,7 @@
<font color="#45317b">Grundidee</font>: <b>synchronizes-with</b>-Beziehung herstellen <i>auf Guard-Variable</i>
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1521788423421" FOLDED="true" ID="ID_992901826" MODIFIED="1521882883828" TEXT="use-cases">
<font NAME="SansSerif" SIZE="12"/>
@ -27474,8 +27477,7 @@
</li>
</ul>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1521788638623" ID="ID_16016457" MODIFIED="1521788679409">
<richcontent TYPE="NODE"><html>
@ -27490,8 +27492,7 @@
auf einer tempor&#228;ren lokalen Instanz-Variable zu arbeiten
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="messagebox_warning"/>
</node>
</node>
@ -27519,8 +27520,7 @@
die verschiedenen Belange im Quelltext nicht zu vermischen
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="yes"/>
</node>
</node>
@ -27548,8 +27548,7 @@
Daher werfen wir ja auch error::Fatal
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
<node CREATED="1521789511870" ID="ID_553276693" MODIFIED="1521789526160" TEXT="Konsistenz-check und Service-Start im Mutex sind ausreichend"/>
@ -27566,8 +27565,7 @@
das auch in fehlerhaftem Double-Checked-Locking auftritt
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="messagebox_warning"/>
</node>
<node CREATED="1521789904872" ID="ID_1237807951" MODIFIED="1521789930400" TEXT="...was aber durch den default (memory_order_seq_cst) mit impliziert ist">
@ -27598,8 +27596,7 @@
der andere Thread ihn grade nutzt.
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1521790222356" ID="ID_168283882" MODIFIED="1521790445457">
<richcontent TYPE="NODE"><html>
@ -27614,8 +27611,7 @@
da&#223; dieser Fall nicht relevant ist
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<richcontent TYPE="NOTE"><html>
<head>
@ -27642,8 +27638,7 @@
da&#223; dieser &quot;andere Thread&quot; nicht (mehr) aktiv sein darf, wenn der Shutdown erfolgt.
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1521790458636" ID="ID_1895342635" MODIFIED="1521791087780" TEXT="Ausnahme: Emergency-Shutdown">
<icon BUILTIN="broken-line"/>
@ -27660,8 +27655,7 @@
hier ist ein <b>Segfault</b>&#160;m&#246;glich
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
</node>
@ -27689,8 +27683,7 @@
...denn wir sind auf x86_64 -- und diese Plattform ist per default <i>fast &#252;berall</i>&#160;sequentially coherent
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node COLOR="#338800" CREATED="1521866206751" ID="ID_702466096" MODIFIED="1521882798384" TEXT="Bezugspunkt: Zugriff auf bereits existierenden Service">
<icon BUILTIN="button_ok"/>
@ -27759,8 +27752,7 @@
Der kaskadierende Aufruf liest dann einfach <i>dessen</i>&#160;Instanz-Pointer
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
<node CREATED="1522110531344" ID="ID_1376369013" MODIFIED="1522110534779" TEXT="custom-ctor">
@ -27780,8 +27772,7 @@
Das k&#246;nnte mit dem Factory-Management einer bereits installierten Konfiguration kollidieren
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1522112400703" ID="ID_1562178283" MODIFIED="1522112404258" TEXT="Factory erstellen"/>
</node>
@ -27845,8 +27836,7 @@
damit nicht doch noch der Deleter l&#228;uft.
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="ksmiletris"/>
</node>
<node COLOR="#338800" CREATED="1522387936585" ID="ID_1922190351" MODIFIED="1522388778471" TEXT="es w&#xe4;re besser, wenn Factory &#xfc;berhaupt nicht assignable w&#xe4;re">
@ -27859,8 +27849,7 @@
...und man stattdessen explizit eine <i>gef&#228;hrliche Funktion</i>&#160; aufrufen mu&#223;
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<icon BUILTIN="button_ok"/>
</node>
</node>
@ -27979,8 +27968,7 @@
Konsequenz: das ist <b>keine Library-Implementierung</b>
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
<node COLOR="#338800" CREATED="1521790951152" ID="ID_974126504" MODIFIED="1521946981024" TEXT="Semantik der Konfigurations-Varianten beschreiben">
@ -28020,7 +28008,8 @@
</node>
</node>
</node>
<node CREATED="1520722160591" ID="ID_135546699" MODIFIED="1520722168810" TEXT="Unit-Test">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1520722160591" ID="ID_135546699" MODIFIED="1522421617782" TEXT="Unit-Test">
<icon BUILTIN="pencil"/>
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die von der alten DependencyFactory abh&#228;ngen
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Und dann w&#228;re es ziemlich pervasiv, sowas zum Freund zu erkl&#228;ren.
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<b>DependencyFactory</b>&#160;ist viel besser geeignet
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das sind verschiedene Blickwinkel auf das gleiche Thema
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</li>
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eine <i>Solche</i>&#160;konstituiert die synchronizes-with-Beziehuung
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<b>Grundbeziehung</b>: synchronizes-with
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das gilt nur im Rahmen der <b>synchronizes-with</b>-Beziehung
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das hei&#223;t, nur f&#252;r einen <b>vom gleichen Mutex gesch&#252;tzen</b>&#160; Bereich!
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Allerdinsg nicht auf einer Plattform, die ohnehin sequentiell-konsistent ist. Wie &quot;zum Beispiel&quot; x86/64
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...haben wir es hier mit einem <b>Pattern</b>&#160;zu tun
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ich nenne es &quot;<b>synchronised visibility cones</b>&quot;
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In Realit&#228;t arbeiten mehrere Threads/Cores mit mehreren Entit&#228;ten
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die shared zone anzufassen!
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END
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weil sich die Threads gegenseitig ihre Counter inkrementieren.
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verwenden globale Variable oder &#252;berhaupt keine Objektfelder
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