T- the type of the object managed by this initializer class
public final class SafeInitializer<T> extends java.lang.Object
ConcurrentInitializer implementation which is similar
AtomicInitializer, but ensures that the
method is called only once.
AtomicInitializer this class is based on atomic variables, so it
can create an object under concurrent access without synchronization.
However, it implements an additional check to guarantee that the
#initialize() method which actually creates the object cannot be
called multiple times.
Because of this additional check this implementation is slightly less
AtomicInitializer, but if the object creation in the
initialize() method is expensive or if multiple invocations of
initialize() are problematic, it is the better alternative.
From its semantics this class has the same properties as
LazyInitializer. It is a "save" implementation of the lazy
initializer pattern. Comparing both classes in terms of efficiency is
difficult because which one is faster depends on multiple factors. Because
AtomicSafeInitializer does not use synchronization at all it probably
LazyInitializer, at least under low or moderate concurrent
access. Developers should run their own benchmarks on the expected target
platform to decide which implementation is suitable for their specific use
|Modifier and Type||Method and Description|
Get (and initialize, if not initialized yet) the required object
public final T get()
org.apache.commons.lang3.concurrent.ConcurrentException- if the initialization of the object causes an exception