ConcurrentInitializer (Apache Commons Lang 3.20.0 API)
Description: declaration: package: org.apache.commons.lang3.concurrent, interface: ConcurrentInitializer

# Interface ConcurrentInitializer<T>

Type Parameters:
  `T` - the type of the object managed by this initializer class.

All Superinterfaces:
  `FailableSupplier<T, ConcurrentException>`

All Known Implementing Classes:
  `AbstractConcurrentInitializer, AtomicInitializer, AtomicSafeInitializer, BackgroundInitializer, CallableBackgroundInitializer, ConstantInitializer, LazyInitializer, MultiBackgroundInitializer`

public interface ConcurrentInitializer<T> extends FailableSupplier<T, ConcurrentException>
Defines the thread-safe initialization of objects.

The idea behind this interface is to provide access to an object in a thread-safe manner. A `ConcurrentInitializer` can be passed to multiple threads which can all access the object produced by the initializer. Through the `FailableSupplier.get()` method the object can be queried.

Concrete implementations of this interface will use different strategies for the creation of the managed object, e.g. lazy initialization or initialization in a background thread. This is completely transparent to client code, so it is possible to change the initialization strategy without affecting clients.

An implementation of `FailableSupplier.get()` returns the fully initialized object produced by this `ConcurrentInitializer`. A concrete implementation here returns the results of the initialization process. This method may block until results are available. Typically, once created the result object is always the same.

An implementation throws `ConcurrentException` if an error occurred during initialization of the object.

Since:
  3.0

- ## Field Summary

  ### Fields inherited from interface FailableSupplier

  `NUL`

- ## Method Summary

  ### Methods inherited from interface FailableSupplier

  `get`