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The strategy used to determine what object gets injected is defined inside Tapestry IoC itself; thus we can take advantage of several features of the Tapestry IoC container in order to take control over specific injections.

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Sometimes you'll want to define the override as a service of its own. This is useful if you want to inject a Logger specific to the service, or if the overriding implementation needs a service configuration:

  public static void bind(ServiceBinder binder)
  {
    binder.bind(SomeServiceType.class, SomeServiceTypeOverrideImpl.class).withId("SomeServiceTypeOverride");
  }

  @Contribute(ServiceOverride.class)
  public static void setupApplicationServiceOverrides(MappedConfiguration<Class,Object> configuration, @Local SomeServiceType override)
  {
    configuration.add(SomeServiceType.class, override);
  }

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Decorating Services

Another option is to decorate the existing service. Perhaps you want to extend some of the behavior of the service but keep the rest.

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