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)}.

        Infrastructure infra = new InfrastructureImpl(manager);


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


        ObjectProvider provider = infra.getObjectProvider();


        try
        {
            provider.provide("expression", Runnable.class, locator);
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertEquals(ex.getMessage(), ServicesMessages.infrastructureModeNotSet());

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        infra.setMode("papyrus");


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


        ObjectProvider provider = infra.getObjectProvider();


        Runnable actual = provider.provide("myrunnable", Runnable.class, locator);


        assertSame(actual, r);


        verify();
    }

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        infra.setMode("clay");


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


        ObjectProvider provider = infra.getObjectProvider();


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


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


        verify();

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        Infrastructure infra = new InfrastructureImpl(manager);


        infra.setMode("clay");


        ObjectProvider provider = infra.getObjectProvider();


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

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        infra.setMode("papyrus");


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


        ObjectProvider provider = infra.getObjectProvider();


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

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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(String expression, Class<T> objectType, ServiceLocator locator)
            {
                return alias.getObjectProvider().provide(expression, objectType, locator);
            }

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{
    @SuppressWarnings("unchecked")
    @Test
    public void found_match_first()
    {
        ObjectProvider prov1 = mockObjectProvider();
        ObjectProvider prov2 = mockObjectProvider();
        Class type = Runnable.class;
        AnnotationProvider ap = mockAnnotationProvider();
        ObjectLocator locator = mockObjectLocator();
        Object expected = mockRunnable();

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    @SuppressWarnings("unchecked")
    @Test
    public void found_later_match()
    {
        ObjectProvider prov1 = mockObjectProvider();
        ObjectProvider prov2 = mockObjectProvider();
        Class type = Runnable.class;
        AnnotationProvider ap = mockAnnotationProvider();
        ObjectLocator locator = mockObjectLocator();
        Object expected = mockRunnable();

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    @SuppressWarnings("unchecked")
    @Test
    public void no_match_but_optional()
    {
        ObjectProvider prov1 = mockObjectProvider();
        ObjectProvider prov2 = mockObjectProvider();
        Class type = Runnable.class;
        AnnotationProvider ap = mockAnnotationProvider();
        ObjectLocator locator = mockObjectLocator();


        train_provide(prov1, type, ap, locator, null);

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    @SuppressWarnings("unchecked")
    @Test
    public void no_match_and_required()
    {
        ObjectProvider prov1 = mockObjectProvider();
        ObjectProvider prov2 = mockObjectProvider();
        Class type = Runnable.class;
        AnnotationProvider ap = mockAnnotationProvider();
        ObjectLocator locator = mockObjectLocator();
        Object expected = mockRunnable();

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Related Classes of org.apache.tapestry.ioc.ObjectProvider

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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