Ichthyostega
fc546f71b4
Dependency-Injection rather fits into the "fundamentals" section. It is more than a mere library facility
153 lines
4.3 KiB
C++
153 lines
4.3 KiB
C++
/*
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SingletonSubclass(Test) - actually creating a subclass of the Singleton Type
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file singleton-subclass-test.cpp
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** unit test \ref SingletonSubclass_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/format-string.hpp"
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#include "lib/format-cout.hpp"
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#include "lib/util.hpp"
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#include "test-target-obj.hpp"
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#include "lib/depend.hpp"
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#include "lib/depend-inject.hpp"
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#include <boost/lexical_cast.hpp>
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using boost::lexical_cast;
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using util::isSameObject;
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using util::_Fmt;
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using util::isnil;
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using std::string;
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namespace lib {
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namespace test{
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using lumiera::error::LUMIERA_ERROR_LIFECYCLE;
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/**
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* Target object to be instantiated as Singleton
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* Allocates a variable amount of additional heap memory
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* and prints diagnostic messages.
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*/
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class Interface : public TestTargetObj
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{
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public:
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static int cnt;
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static void setCountParam (uint c) { Interface::cnt = c; }
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virtual string identify() { return "Interface"; }
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protected:
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Interface () : TestTargetObj(cnt) {}
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virtual ~Interface() {}
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friend class lib::DependencyFactory<Interface>;
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};
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int Interface::cnt = 0;
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class Impl : public Interface
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{
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public:
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virtual string identify() { return "Implementation"; }
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};
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// for checking the safety.....
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class Impl_XXX : public Impl { };
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class Unrelated { };
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/***************************************************************//**
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* @test specific dependency-injection setup, to create a singleton
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* subclass (implementation class) instance, without coupling
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* the caller to the concrete type.
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* @remark Expected results: an instance of the subclass is created.
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* @see lib::Depend
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* @see lib/depend-inject.hpp
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*/
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class SingletonSubclass_test : public Test
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{
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virtual void
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run(Arg arg)
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{
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uint num= isnil(arg)? 1 : lexical_cast<uint>(arg[1]);
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cout << _Fmt("using the Singleton should create TargetObj(%d)...\n") % num;
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Interface::setCountParam(num);
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// configuration to use the subclass on demand
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DependInject<Interface>::useSingleton<Impl>();
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// define an instance of the Singleton factory as always...
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Depend<Interface> instance;
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// Now use the Singleton factory...
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// Note: we get the Base type
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Interface& t1 = instance();
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Interface& t2 = instance();
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CHECK (isSameObject (t1, t2), "not a Singleton, got two different instances." );
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CHECK ( INSTANCEOF (Impl,&t1)); // got the subclass as expected
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CHECK ("Implementation" == t2.identify());
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cout << "calling a non-static method on the Singleton-"
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<< t1.identify() << endl
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<< t1 << endl;
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verify_error_detection ();
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}
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void
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verify_error_detection ()
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{
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VERIFY_ERROR (LIFECYCLE, DependInject<Interface>::useSingleton<Impl_XXX>() );
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Depend<Interface> newFactory;
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CHECK ( INSTANCEOF (Impl, &newFactory() )); // works as before
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//////////does not compile due to incompatible baseclass
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// DependInject<Interface>::useSingleton<Unrelated>();
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}
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};
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/** Register this test class... */
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LAUNCHER (SingletonSubclass_test, "unit common");
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}} // namespace lib::test
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