Examples of com.google.inject.Provider

com.google.inject.Provider
Simply, any object capable of providing instances of type {@code T}. Providers are used in numerous ways by the Guice framework:
- When the default means for obtaining instances (an injectable or parameterless constructor) is insufficient for a particular binding, the module can specify a custom {@code Provider} instead, to control exactly howGuice creates or obtains instances for the binding.
- An implementation class may always choose to have a {@code Provider}instance injected, rather than having a {@code T} injected directly. Thismay give you access to multiple instances, instances you wish to safely mutate and discard, instances which are out of scope (e.g. using a {@code @RequestScoped} object from within a {@code @SessionScoped} object),or instances you don't want to initialize until they are absolutely needed.
- A custom {@link Scope} is implemented as a decorator of{@code Provider}, which decides when to delegate to the backing provider and when to provide the instance some other way.
- The {@link Injector} offers access to the {@code Provider} it usesto fulfill requests for a given key, via the {@link Injector#getProvider}methods.
@param < T> the type of object this provider provides @author crazybob@google.com (Bob Lee)

            @Override
            protected void configure() {
                bind(MessageBus.class).toInstance(bus);
                //bind(RequestDispatcher.class).toInstance(context.getService().getDispatcher());


                bind(type).toProvider(new Provider() {
                    public Object get() {
                        return resourceProvider.get();
                    }
                });
            }

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    {
      public Object get(Errors paramAnonymousErrors, InternalContext paramAnonymousInternalContext, Dependency paramAnonymousDependency, boolean paramAnonymousBoolean)
        throws ErrorsException
      {
        paramAnonymousErrors = paramAnonymousErrors.withSource(localKey);
        Provider localProvider = (Provider)localBindingImpl.getInternalFactory().get(paramAnonymousErrors, paramAnonymousInternalContext, paramAnonymousDependency, true);
        try
        {
          Object localObject1 = localProvider.get();
          if ((localObject1 != null) && (!localClass1.isInstance(localObject1)))
            throw paramAnonymousErrors.subtypeNotProvided(localClass2, localClass1).toException();
          Object localObject2 = localObject1;
          return localObject2;
        }

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  public Provider getProvider(Key paramKey)
  {
    Errors localErrors = new Errors(paramKey);
    try
    {
      Provider localProvider = getProviderOrThrow(paramKey, localErrors);
      localErrors.throwIfNewErrors(0);
      return localProvider;
    }
    catch (ErrorsException localErrorsException)
    {

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      this.providedBinding = ((BindingImpl)paramBinding);
    }


    static InternalFactory createInternalFactory(Binding paramBinding)
    {
      Provider localProvider = paramBinding.getProvider();
      return new InternalFactory()
      {
        public Provider get(Errors paramAnonymousErrors, InternalContext paramAnonymousInternalContext, Dependency paramAnonymousDependency, boolean paramAnonymousBoolean)
        {
          return this.val$provider;

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    {
      public Object get(Errors paramAnonymousErrors, InternalContext paramAnonymousInternalContext, Dependency paramAnonymousDependency, boolean paramAnonymousBoolean)
        throws ErrorsException
      {
        paramAnonymousErrors = paramAnonymousErrors.withSource(localKey);
        Provider localProvider = (Provider)localBindingImpl.getInternalFactory().get(paramAnonymousErrors, paramAnonymousInternalContext, paramAnonymousDependency, true);
        try
        {
          Object localObject1 = localProvider.get();
          if ((localObject1 != null) && (!localClass1.isInstance(localObject1)))
            throw paramAnonymousErrors.subtypeNotProvided(localClass2, localClass1).toException();
          Object localObject2 = localObject1;
          return localObject2;
        }

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  public Provider getProvider(Key paramKey)
  {
    Errors localErrors = new Errors(paramKey);
    try
    {
      Provider localProvider = getProviderOrThrow(paramKey, localErrors);
      localErrors.throwIfNewErrors(0);
      return localProvider;
    }
    catch (ErrorsException localErrorsException)
    {

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  public Boolean visit(ProviderLookup paramProviderLookup)
  {
    try
    {
      Provider localProvider = this.injector.getProviderOrThrow(paramProviderLookup.getKey(), this.errors);
      paramProviderLookup.initializeDelegate(localProvider);
    }
    catch (ErrorsException localErrorsException)
    {
      this.errors.merge(localErrorsException.getErrors());

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      this.providedBinding = ((BindingImpl)paramBinding);
    }


    static InternalFactory createInternalFactory(Binding paramBinding)
    {
      Provider localProvider = paramBinding.getProvider();
      return new InternalFactory()
      {
        public Provider get(Errors paramAnonymousErrors, InternalContext paramAnonymousInternalContext, Dependency paramAnonymousDependency, boolean paramAnonymousBoolean)
        {
          return this.val$provider;

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    return this.delegate;
  }


  public Provider getProvider()
  {
    return new Provider()
    {
      public Object get()
      {
        $Preconditions.checkState(ProviderLookup.this.delegate != null, "This Provider cannot be used until the Injector has been created.");
        return ProviderLookup.this.delegate.get();

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    // Only need to bind the proxy once, for all locales.
    if (!i18nedSoFar.contains(iface)) {
      i18nedSoFar.add(iface);


      binder.bind((Class)iface).toProvider(new Provider() {


        // Wonderful Guice hack to get around not using assisted inject.
        @Inject
        private final Provider<HttpServletRequest> requestProvider = null;

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