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Object Providers

When you don't provide the @InjectService annotation on a parameter (to a service builder method or constructor), Tapestry will resolve the parameter automatically.

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The Value annotation allows a literal value to be injected. When combined with symbols, they represent a way for parts of the overall service network to be spot-configured. For example:

  public MyService build(@Value("${max-seconds}") long maxSeconds)
  {
    return new MyServiceImpl(maxSeconds);
  }

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This is closely related to the @Value annotation approach, except that the annotation directly specifies a symbol name.

  public MyService build(@Symbol("max-seconds") long maxSeconds)
  {
    return new MyServiceImpl(maxSeconds);
  }

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Example:

  public void contributeMasterObjectProvider(OrderedConfiguration<ObjectProvider> configuration)
  {
    configuration.add("MyObject", new MyObjectProvider());
  }

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Of course, this is a simplified example. In a real scenario, the provider is most likely a service with its own dependencies.

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