Class LazyResourceManager


@NoReference public class LazyResourceManager extends ResourceManager
A LRU based ResourceManager Wrapper. Not to be used by clients.
  • Constructor Details

    • LazyResourceManager

      public LazyResourceManager(int cacheSize, ResourceManager parent)
      cacheSize - the lru cache size
      parent - ResourceManager
  • Method Details

    • getDevice

      public Device getDevice()
      Description copied from class: ResourceManager
      Returns the Device for which this ResourceManager will create resources
      Specified by:
      getDevice in class ResourceManager
      the Device associated with this ResourceManager
    • getDefaultImage

      protected Image getDefaultImage()
      Description copied from class: ResourceManager
      Returns the default image that will be returned in the event that the intended image is missing.
      Specified by:
      getDefaultImage in class ResourceManager
      a default image that will be returned in the event that the intended image is missing.
    • create

      public Object create(DeviceResourceDescriptor descriptor)
      Description copied from class: ResourceManager
      Returns the resource described by the given descriptor. If the resource already exists, the reference count is incremented and the exiting resource is returned. Otherwise, a new resource is allocated. Every call to this method should have a corresponding call to ResourceManager.destroy(DeviceResourceDescriptor).

      If the resource is intended to live for entire lifetime of the resource manager, a subsequent call to ResourceManager.destroy(DeviceResourceDescriptor) may be omitted and the resource will be cleaned up when the resource manager is disposed. This pattern is useful for short-lived LocalResourceManagers, but should never be used with the global resource manager since doing so effectively leaks the resource.

      The resources returned from this method are reference counted and may be shared internally with other resource managers. They should never be disposed outside of the ResourceManager framework, or it will cause exceptions in other code that shares them. For example, never call Resource.dispose() on anything returned from this method.

      Callers may safely downcast the result to the resource type associated with the descriptor. For example, when given an ImageDescriptor, the return value of this method will always be an Image.

      Specified by:
      create in class ResourceManager
      descriptor - descriptor for the resource to allocate
      the newly allocated resource (not null)
    • destroy

      public void destroy(DeviceResourceDescriptor descriptor)
      Description copied from class: ResourceManager
      Deallocates a resource previously allocated by ResourceManager.create(DeviceResourceDescriptor). Descriptors are compared by equality, not identity. If the same resource was created multiple times, this may decrement a reference count rather than disposing the actual resource.
      Specified by:
      destroy in class ResourceManager
      descriptor - identifier for the resource
    • find

      public Object find(DeviceResourceDescriptor descriptor)
      Description copied from class: ResourceManager
      Returns a previously allocated resource associated with the given descriptor, or null if none exists yet.
      Specified by:
      find in class ResourceManager
      descriptor - descriptor to find
      a previously allocated resource for the given descriptor or null if none.