Package org.apache.tapestry5.commons.services

## Interface PlasticProxyFactory

- All Superinterfaces:
    `PlasticClassListenerHub`
  All Known Implementing Classes:
    `PlasticProxyFactoryImpl`

      public interface PlasticProxyFactory
      extends PlasticClassListenerHub

  A service used to create proxies of varying types. As a secondary concern, manages to identify the location of methods and constructors, which is important for exception reporting.
  Since:
    5.3

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `clearCache()` | Clears any cached information stored by the proxy factory; this is useful in Tapestry development mode when a class loader may have been discarded (because the proxy factory may indirectly keep references to classes loaded by the old class loader).
    `<T> T` | `createProxy​(Class<T> interfaceType, Class<? extends T> implementationType, ObjectCreator<T> creator, String description)` | Creates a proxy instance that delegates all methods through a corresponding ObjectCreator.
    `<T> ClassInstantiator<T>` | `createProxy​(Class<T> interfaceType, Class<? extends T> implementationType, PlasticClassTransformer callback)` | Same as `createProxy(interfacetype, implementationType, callback, true)`
    `<T> ClassInstantiator<T>` | `createProxy​(Class<T> interfaceType, Class<? extends T> implementationType, PlasticClassTransformer callback, boolean introduceInterface)` | Creates a proxy object that implements the indicated interface and indicated service implementation type, then invokes the callback to further configure the proxy.
    `<T> T` | `createProxy​(Class<T> interfaceType, ObjectCreator<T> creator, String description)` | Creates a proxy instance that delegates all methods through a corresponding ObjectCreator.
    `<T> ClassInstantiator<T>` | `createProxy​(Class<T> interfaceType, PlasticClassTransformer callback)` | Creates a proxy object that implements the indicated interface, then invokes the callback to further configure the proxy.
    `<T> PlasticClassTransformation<T>` | `createProxyTransformation​(Class<T> interfaceType)` | Creates the underlying `PlasticClassTransformation` for an interface proxy.
    `<T> PlasticClassTransformation<T>` | `createProxyTransformation​(Class<T> interfaceType, Class<? extends T> implementationType)` | Creates the underlying `PlasticClassTransformation` for an interface proxy with a given implementation class.
    `ClassLoader` | `getClassLoader()` | Returns the class loader used when creating new classes, this is a child class loader of another class loader (usually, the thread's context class loader).
    `Location` | `getConstructorLocation​(Constructor constructor)` | Return a string representation for the constructor (including class and parameters) and (if available) file name and line number.
    `Location` | `getMethodLocation​(Method method)` | Converts a method to a `Location`, which includes information about the source file name and line number.

    - ### Methods inherited from interface org.apache.tapestry5.plastic.PlasticClassListenerHub

      `addPlasticClassListener, removePlasticClassListener`

- - ### Method Detail

    - #### getClassLoader

          ClassLoader getClassLoader()

      Returns the class loader used when creating new classes, this is a child class loader of another class loader (usually, the thread's context class loader).

    - #### createProxy

          <T> ClassInstantiator<T> createProxy​(Class<T> interfaceType,
                                               PlasticClassTransformer callback)

      Creates a proxy object that implements the indicated interface, then invokes the callback to further configure the proxy.
      Parameters:
        `interfaceType` - interface implemented by proxy
        `callback` - configures the proxy
      Returns:
        instantiator that can be used to create an instance of the proxy class

    - #### createProxy

          @IncompatibleChange(release="5.4.5",
                              details="TAP5-2528")
          <T> ClassInstantiator<T> createProxy​(Class<T> interfaceType,
                                               Class<? extends T> implementationType,
                                               PlasticClassTransformer callback,
                                               boolean introduceInterface)

      Creates a proxy object that implements the indicated interface and indicated service implementation type, then invokes the callback to further configure the proxy.
      Parameters:
        `interfaceType` - interface implemented by proxy
        `implementationType` - a class that implements the interfaceType. It can be null.
        `callback` - configures the proxy
      Returns:
        instantiator that can be used to create an instance of the proxy class

    - #### createProxy

          @IncompatibleChange(release="5.4",
                              details="TAP5-2029")
          <T> ClassInstantiator<T> createProxy​(Class<T> interfaceType,
                                               Class<? extends T> implementationType,
                                               PlasticClassTransformer callback)

      Same as `createProxy(interfacetype, implementationType, callback, true)`
      Parameters:
        `interfaceType` - interface implemented by proxy
        `implementationType` - a class that implements the interfaceType. It can be null.
        `callback` - configures the proxy
      Returns:
        instantiator that can be used to create an instance of the proxy class

    - #### createProxyTransformation

          <T> PlasticClassTransformation<T> createProxyTransformation​(Class<T> interfaceType)

      Creates the underlying `PlasticClassTransformation` for an interface proxy. This should only be used in the cases where encapsulating the PlasticClass construction into a callback is not feasible (which is the case for some of the older APIs inside Tapestry IoC).
      Parameters:
        `interfaceType` - class proxy will extend from
      Returns:
        transformation from which an instantiator may be created

    - #### createProxyTransformation

          @IncompatibleChange(release="5.4",
                              details="TAP5-2029")
          <T> PlasticClassTransformation<T> createProxyTransformation​(Class<T> interfaceType,
                                                                      Class<? extends T> implementationType)

      Creates the underlying `PlasticClassTransformation` for an interface proxy with a given implementation class. This should only be used in the cases where encapsulating the PlasticClass construction into a callback is not feasible (which is the case for some of the older APIs inside Tapestry IoC).
      Parameters:
        `interfaceType` - class proxy will extend from
        `implementationType` - a class that implements the interfaceType. It can be null.
      Returns:
        transformation from which an instantiator may be created

    - #### createProxy

          <T> T createProxy​(Class<T> interfaceType,
                            ObjectCreator<T> creator,
                            String description)

      Creates a proxy instance that delegates all methods through a corresponding ObjectCreator. Each method invocation on the proxy will route through `ObjectCreator.createObject()` (the creator implementation may decide to cache the return value as appropriate).
      Type Parameters:
        `T` - type of proxy
      Parameters:
        `interfaceType` - interface class for proxy
        `creator` - object responsible for creating the real object
        `description` - the `toString()` of the proxy
      Returns:
        proxy instance

    - #### createProxy

          @IncompatibleChange(release="5.4",
                              details="Added for TAP5-2029")
          <T> T createProxy​(Class<T> interfaceType,
                            Class<? extends T> implementationType,
                            ObjectCreator<T> creator,
                            String description)

      Creates a proxy instance that delegates all methods through a corresponding ObjectCreator. Each method invocation on the proxy will route through `ObjectCreator.createObject()` (the creator implementation may decide to cache the return value as appropriate).
      Type Parameters:
        `T` - type of proxy
      Parameters:
        `interfaceType` - interface class for proxy
        `implementationType` - class that implements the interface type. It may be null
        `creator` - object responsible for creating the real object
        `description` - the `toString()` of the proxy
      Returns:
        proxy instance

    - #### getMethodLocation

          Location getMethodLocation​(Method method)

      Converts a method to a `Location`, which includes information about the source file name and line number.
      Parameters:
        `method` - to look up
      Returns:
        the location (identifying the method and possibly, the line number within the method)

    - #### getConstructorLocation

          Location getConstructorLocation​(Constructor constructor)

      Return a string representation for the constructor (including class and parameters) and (if available) file name and line number.
      Returns:
        the location (identifying the constructor and possibly, the line number within the method)

    - #### clearCache

          void clearCache()

      Clears any cached information stored by the proxy factory; this is useful in Tapestry development mode when a class loader may have been discarded (because the proxy factory may indirectly keep references to classes loaded by the old class loader).
      Since:
        5.3.3