Package javax.ws.rs.core

Interface Configurable<C extends Configurable>

  • All Known Subinterfaces:
    Client, FeatureContext, WebTarget
    All Known Implementing Classes:
    ClientBuilder
    public interface Configurable<C extends Configurable>
    Represents a client or server-side configurable context. A configurable context can be used to define the components as well as additional meta-data that should be used in the scope of the configured context. The modification of the context typically involves setting properties or registering custom components, such as providers and/or features. All modifications of a Configurable context are reflected in the associated Configuration state which is exposed via getConfiguration() method.

    A configurable context can be either indirectly associated with a particular component (such as application or resource method configurable context passed to a Feature or DynamicFeature meta-providers) or can be directly represented by a concrete component implementing the Configurable interface (such as Client or WebTarget). As such, the exact scope of a configuration context is typically determined by a use case scenario in which the context is accessed.

    Setting properties.

    New properties can be set using the property(java.lang.String, java.lang.Object) method. Similarly, updating a value of an existing property can be achieved using the same method. Information about the configured set of properties is available via the underlying Configuration object. An existing property can be removed by assigning a null value to the property.

    Registering components.

    Registered custom component classes and instances are important part of the contextual configuration information as these are the main factors that determine the capabilities of a configured runtime. Implementations SHOULD warn about and ignore registrations that do not conform to the requirements of supported components in a given configurable context.

    In most cases, when registering a component, the simplest form of methods (register(Class) or register(Object)) of the available registration API is sufficient.

    For example: 

     config.register(HtmlDocumentReader.class);
 config.register(new HtmlDocumentWriter(writerConfig));

    In some situations a component class or instance may implement multiple provider contracts recognized by an implementation (e.g. filter, interceptor or entity provider). By default, the implementation MUST register the new component class or instance as a provider for all the recognized provider contracts implemented by the component class.

    For example: 

     @Priority(ENTITY_CODER)
 public class GzipInterceptor
         implements ReaderInterceptor, WriterInterceptor { ... }

 ...

 // register GzipInterceptor as a ReaderInterceptor
 // as well as a WriterInterceptor
 config.register(GzipInterceptor.class);

    There are however situations when the default registration of a component to all the recognized provider contracts is not desirable. In such cases users may use other versions of the register(...) method to explicitly specify the collection of the provider contracts for which the component should be registered and/or the priority of each registered provider contract.

    For example: 

     @Priority(USER)
 public class ClientLoggingFilter
         implements ClientRequestFilter, ClientResponseFilter { ... }

 @Priority(ENTITY_CODER)
 public class GzipInterceptor
         implements ReaderInterceptor, WriterInterceptor { ... }

 ...

 // register ClientLoggingFilter as a ClientResponseFilter only
 config.register(ClientLoggingFilter.class, ClientResponseFilter.class);

 // override the priority of registered GzipInterceptor
 // and both of it's provider contracts
 config.register(GzipInterceptor.class, 6500);

    As a general rule, for each component class there can be at most one registration — class-based or instance-based — configured at any given moment. Implementations MUST reject any attempts to configure a new registration for a provider class that has been already registered in the given configurable context earlier. Implementations SHOULD also raise a warning to inform the user about the rejected component registration.

    For example: 

     config.register(GzipInterceptor.class, WriterInterceptor.class);
 config.register(GzipInterceptor.class);       // Rejected by runtime.
 config.register(new GzipInterceptor());       // Rejected by runtime.
 config.register(GzipInterceptor.class, 6500); // Rejected by runtime.

 config.register(new ClientLoggingFilter());
 config.register(ClientLoggingFilter.class);   // rejected by runtime.
 config.register(ClientLoggingFilter.class,
                 ClientResponseFilter.class);  // Rejected by runtime.

    Since:
    2.0
    Author:
    Marek Potociar

    • Method Summary

      Modifier and Type Method Description
      Configuration getConfiguration()
      Get a live view of an internal configuration state of this configurable instance.
      C property​(String name, Object value)
      Set the new configuration property, if already set, the existing value of the property will be updated.
      C register​(Class<?> componentClass)
      Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Class<?> componentClass, int priority)
      Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Class<?> componentClass, Class<?>... contracts)
      Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Class<?> componentClass, Map<Class<?>,​Integer> contracts)
      Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Object component)
      Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Object component, int priority)
      Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Object component, Class<?>... contracts)
      Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.
      C register​(Object component, Map<Class<?>,​Integer> contracts)
      Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

    • Method Detail

      • getConfiguration

        Configuration getConfiguration()
        Get a live view of an internal configuration state of this configurable instance. Any changes made using methods of this Configurable instance will be reflected in the returned Configuration instance.

        The returned Configuration instance and the collection data it provides are not thread-safe wrt. modification made using methods on the parent configurable object.

        Returns:
        configuration live view of the internal configuration state.

      • property

        C property​(String name,
           Object value)
        Set the new configuration property, if already set, the existing value of the property will be updated. Setting a null value into a property effectively removes the property from the property bag.
        Parameters:
        name - property name.
        value - (new) property value. null value removes the property with the given name.
        Returns:
        the updated configurable instance.

      • register

        C register​(Class<?> componentClass)
        Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context. Implementations SHOULD warn about and ignore registrations that do not conform to the requirements of supported component types in the given configurable context. Any subsequent registration attempts for a component type, for which a class or instance-based registration already exists in the system MUST be rejected by the API implementation and a warning SHOULD be raised to inform the user about the rejected registration. The registered component class is registered as a contract provider of all the recognized API or implementation-specific extension contracts including meta-provider contracts, such as Feature or DynamicFeature.

        As opposed to component instances registered via register(Object) method, the lifecycle of components registered using this class-based register(...) method is fully managed by the implementation or any underlying IoC container supported by the implementation.

        Parameters:
        componentClass - component class to be configured in the scope of this configurable context.
        Returns:
        the updated configurable context.

      • register

        C register​(Class<?> componentClass,
           int priority)
        Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides the same functionality as register(Class) except that any priority specified on the registered component class via javax.annotation.Priority annotation is overridden with the supplied priority value.

        Note that in case the priority is not applicable to a particular provider contract implemented by the class of the registered component, the supplied priority value will be ignored for that contract.

        Parameters:
        componentClass - component class to be configured in the scope of this configurable context.
        priority - the overriding priority for the registered component and all the provider contracts the component implements.
        Returns:
        the updated configurable context.

      • register

        C register​(Class<?> componentClass,
           Class<?>... contracts)
        Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides the same functionality as register(Class) except the component class is only registered as a provider of the listed extension provider or meta-provider contracts. All explicitly enumerated contract types must represent a class or an interface implemented or extended by the registered component. Contracts that are not assignable from the registered component class MUST be ignored and implementations SHOULD raise a warning to inform users about the ignored contract(s).

        Parameters:
        componentClass - component class to be configured in the scope of this configurable context.
        contracts - the specific extension provider or meta-provider contracts implemented by the component for which the component should be registered. Implementations MUST ignore attempts to register a component class for an empty or null collection of contracts via this method and SHOULD raise a warning about such event.
        Returns:
        the updated configurable context.

      • register

        C register​(Class<?> componentClass,
           Map<Class<?>,​Integer> contracts)
        Register a class of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides same functionality as register(Class, Class[]) except that any priority specified on the registered component class via javax.annotation.Priority annotation is overridden for each extension provider contract type separately with an integer priority value specified as a value in the supplied map of [contract type, priority] pairs.

        Note that in case a priority is not applicable to a provider contract registered for the component, the supplied priority value is ignored for such contract.

        Parameters:
        componentClass - component class to be configured in the scope of this configurable context.
        contracts - map of the specific extension provider and meta-provider contracts and their associated priorities for which the component is registered. All contracts in the map must represent a class or an interface implemented or extended by the component. Contracts that are not assignable from the registered component class MUST be ignored and implementations SHOULD raise a warning to inform users about the ignored contract(s).
        Returns:
        the updated configurable context.

      • register

        C register​(Object component)
        Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context. Implementations SHOULD warn about and ignore registrations that do not conform to the requirements of supported component types in the given configurable context. Any subsequent registration attempts for a component type, for which a class or instance-based registration already exists in the system MUST be rejected by the API implementation and a warning SHOULD be raised to inform the user about the rejected registration. The registered component is registered as a contract provider of all the recognized API or implementation-specific extension contracts including meta-provider contracts, such as Feature or DynamicFeature.

        As opposed to components registered via register(Class) method, the lifecycle of providers registered using this instance-based register(...) is not managed by the runtime. The same registered component instance is used during the whole lifespan of the configurable context. Fields and properties of all registered component instances are injected with their declared dependencies (see Context) by the runtime prior to use.

        Parameters:
        component - component instance to be configured in the scope of this configurable context.
        Returns:
        the updated configurable context.

      • register

        C register​(Object component,
           int priority)
        Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides the same functionality as register(Object) except that any priority specified on the registered component class via javax.annotation.Priority annotation is overridden with the supplied priority value.

        Note that in case the priority is not applicable to a particular provider contract implemented by the class of the registered component, the supplied priority value will be ignored for that contract.

        Parameters:
        component - component instance to be configured in the scope of this configurable context.
        priority - the overriding priority for the registered component and all the provider contracts the component implements.
        Returns:
        the updated configurable context.

      • register

        C register​(Object component,
           Class<?>... contracts)
        Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides the same functionality as register(Object) except the component class is only registered as a provider of the listed extension provider or meta-provider contracts. All explicitly enumerated contract types must represent a class or an interface implemented or extended by the registered component. Contracts that are not assignable from the registered component class MUST be ignored and implementations SHOULD raise a warning to inform users about the ignored contract(s).

        Parameters:
        component - component instance to be configured in the scope of this configurable context.
        contracts - the specific extension provider or meta-provider contracts implemented by the component for which the component should be registered. Implementations MUST ignore attempts to register a component class for an empty or null collection of contracts via this method and SHOULD raise a warning about such event.
        Returns:
        the updated configurable context.

      • register

        C register​(Object component,
           Map<Class<?>,​Integer> contracts)
        Register an instance of a custom component (such as an extension provider or a feature meta-provider) to be instantiated and used in the scope of this configurable context.

        This registration method provides same functionality as register(Object, Class[]) except that any priority specified on the registered component class via javax.annotation.Priority annotation is overridden for each extension provider contract type separately with an integer priority value specified as a value in the supplied map of [contract type, priority] pairs.

        Note that in case a priority is not applicable to a provider contract registered for the component, the supplied priority value is ignored for such contract.

        Parameters:
        component - component instance to be configured in the scope of this configurable context.
        contracts - map of the specific extension provider and meta-provider contracts and their associated priorities for which the component is registered. All contracts in the map must represent a class or an interface implemented or extended by the component. Contracts that are not assignable from the registered component class MUST be ignored and implementations SHOULD raise a warning to inform users about the ignored contract(s).
        Returns:
        the updated configurable context.