Examples of org.apache.tapestry.ioc.ObjectProvider

org.apache.tapestry.ioc.ObjectProvider
Object providers represent an alternate way to locate an object provided somewhere in the {@link org.apache.tapestry.ioc.Registry}. Instead of using a just the service id to gain access to a service within the Registry, object providers in different flavors are capable of vending, or even creating, objects of disparate types from disparate sources.
Object providers are consulted in a strict order, and the first non-null result is taken.
In many cases, an object provider searches for additional annotations on the element (usually a parameter, or perhaps a field) for which a value is required.
A default ObjectProvider uses {@link ObjectLocator#getService(Class)}.

        alias.setMode(mode);


        // Do not assume that infra and provider are the same;
        // that's an implementation choice.


        ObjectProvider provider = alias.getObjectProvider();


        Runnable actual1 = provider.provide(property, Runnable.class, locator);
        Runnable actual2 = provider.provide(property, Runnable.class, locator);


        assertSame(actual1, r);
        assertSame(actual2, r);


        verify();

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        Alias alias = new AliasImpl(manager, overridesManager);


        alias.setMode(mode);


        ObjectProvider provider = alias.getObjectProvider();


        try
        {
            provider.provide("someexpression", Runnable.class, locator);
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertEquals(

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        alias.setMode(mode);


        // Do not assume that infra and provider are the same;
        // that's an implementation choice.


        ObjectProvider provider = alias.getObjectProvider();


        try
        {
            provider.provide(property, UpdateListenerHub.class, locator);
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertEquals(ex.getMessage(), ServicesMessages.aliasPropertyWrongType(

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    public <T> T getObject(String reference, Class<T> objectType, ServiceLocator locator)
    {
        _lock.check();


        ObjectProvider masterProvider = getService(
                IOCConstants.MASTER_OBJECT_PROVIDER_SERVICE_ID,
                ObjectProvider.class);


        return masterProvider.provide(reference, objectType, locator);
    }

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    }


    @Test
    public void successful_lookup()
    {
        ObjectProvider provider = newObjectProvider();
        ServiceLocator locator = newServiceLocator();
        Runnable r = newRunnable();
        SymbolSource source = newSymbolSource();


        train_expandSymbols(source, "prefix:expression");
        train_provide(provider, "expression", Runnable.class, locator, r);


        replay();


        ObjectProvider master = new MasterObjectProvider(newMap("prefix", provider), source, null);


        Runnable actual = master.provide("prefix:expression", Runnable.class, locator);


        assertSame(actual, r);


        verify();
    }

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    }


    @Test
    public void symbols_are_expanded()
    {
        ObjectProvider provider = newObjectProvider();
        ServiceLocator locator = newServiceLocator();
        Runnable r = newRunnable();
        SymbolSource source = newSymbolSource();


        train_expandSymbols(source, "${symbol}", "prefix:expression");
        train_provide(provider, "expression", Runnable.class, locator, r);


        replay();


        ObjectProvider master = new MasterObjectProvider(newMap("prefix", provider), source, null);


        Runnable actual = master.provide("${symbol}", Runnable.class, locator);


        assertSame(actual, r);


        verify();
    }

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        replay();


        Map<String, ObjectProvider> configuration = CollectionFactory.newMap();


        ObjectProvider master = new MasterObjectProvider(configuration, source, null);


        try
        {
            master.provide("prefix:expression", Runnable.class, locator);
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertEquals(

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        replay();


        Map<String, ObjectProvider> configuration = CollectionFactory.newMap();


        ObjectProvider master = new MasterObjectProvider(configuration, source, coercer);


        assertEquals(master.provide("${value}", Integer.class, locator), new Integer(55));


        verify();
    }

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        // An ugly hack ... perhaps we should introduce a new builtin service so that this can be
        // accomplished in the normal way?


        if (serviceId.equals("MasterObjectProvider"))
        {
            ObjectProvider contribution = new ObjectProvider()
            {
                public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider,
                        ObjectLocator locator)
                {
                    return findServiceByMarkerAndType(objectType, annotationProvider);

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    {
        // There's a nasty web of dependencies related to Alias; this wrapper class lets us
        // defer instantiating the Alias service implementation just long enough to defuse those
        // dependencies.


        ObjectProvider wrapper = new ObjectProvider()
        {
            public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider,
                    ObjectLocator locator)
            {
                return alias.getObjectProvider().provide(objectType, annotationProvider, locator);

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org.apache.tapestry.internal.services.AliasImplTest

org.apache.tapestry.internal.services.AssetObjectProviderTest

org.apache.tapestry.internal.services.InfrastructureImplTest

org.apache.tapestry.internal.services.InjectNamedWorkerTest

org.apache.tapestry.internal.services.InjectWorkerTest

org.apache.tapestry.internal.services.ServiceAnnotationObjectProviderTest

org.apache.tapestry.ioc.internal.RegistryImpl

org.apache.tapestry.ioc.internal.services.MasterObjectProvider

org.apache.tapestry.ioc.internal.services.MasterObjectProviderImplTest

org.apache.tapestry.ioc.internal.services.MasterObjectProviderTest

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