Top Description Methods
stormpot

public Interface Reallocator<T extends Poolable>

extends Allocator<T extends Poolable>
Known Direct Implementers
stormpot.TimingReallocatingAdaptor, stormpot.TimingReallocatorAdaptor, stormpot.ReallocatingAdaptor
Type Parameters
<T>
any type that implements Poolable.
Reallocators are a special kind of Allocator that can reallocate Poolables that have expired. This is useful since the Pool will typically keep the Poolables around for a relatively long time, with respect to garbage collection. Because of this, there is a high chance that the Poolables tenure to the old generation during their life time. This way, pools often cause a slow, but steady accretion of old generation garbage, ultimately helping to increase the frequency of expensive full collections. The accretion of old generation garbage is inevitable, but the rate can be slowed by reusing as much as possible of the Poolable instances, when they are to be reallocated. This interface is only here to enable this optimisation, and implementing it is completely optional.
Author
Chris Vest
Since
2.2

Method Summary

Modifier and TypeMethod and Description
public T

Returns:

A fresh or rejuvenated instance of T. Never `null`.
reallocate(Slot
The slot the pool wish to allocate an object for. Implementers do not need to concern themselves with the details of a pools slot objects. They just have to call release on them as the protocol demands.
slot, T
The non-null Poolable instance to be reallocated.
poolable)

Possibly reallocate the given instance of T for the given slot, and return it if the reallocation was successful, or a fresh replacement if the instance could not be reallocated.

Inherited from stormpot.Allocator:
allocatedeallocate

Method Detail

reallocateback to summary
public T reallocate(Slot slot, T poolable) throws Exception

Possibly reallocate the given instance of T for the given slot, and return it if the reallocation was successful, or a fresh replacement if the instance could not be reallocated. This method is effectively equivalent to the following: [source,java] -- include::src/test/java/examples/Examples.java[tag=reallocatorExample] -- With the only difference that it may, if possible, reuse the given expired Poolable, either wholly or in part. The state stored in the stormpot.SlotInfo for the object is reset upon reallocation, just like it would be in the case of a normal deallocation-allocation cycle. Exceptions thrown by this method may propagate out through the claim method of a pool, in the form of being wrapped inside a PoolException. Pools must be able to handle these exceptions in a sane manner, and are guaranteed to return to a working state if a Reallocator stops throwing exceptions from its reallocate method. Be aware that if the reallocation of an object fails with an exception, then no attempts will be made to explicitly deallocate that object. This way, a failed reallocation is implicitly understood to effectively be a successful deallocation.

Parameters
slot:Slot

The slot the pool wish to allocate an object for. Implementers do not need to concern themselves with the details of a pools slot objects. They just have to call release on them as the protocol demands.

poolable:T

The non-null Poolable instance to be reallocated.

Returns:T

A fresh or rejuvenated instance of T. Never `null`.

Exceptions
Exception:
If the allocation fails.
See Also
allocate(Slot), deallocate(Poolable)