public interface ObjectSizer
EvictionAttributes.createLRUHeapAttributes(ObjectSizer) or
EvictionAttributes.createLRUMemoryAttributes(ObjectSizer) if you want to use a faster or
more accurate method of sizing than provided by the default object sizer, which is
SIZE_CLASS_ONCE| Modifier and Type | Field and Description |
|---|---|
static ObjectSizer |
DEFAULT
The default object sizer, currently
SIZE_CLASS_ONCE |
static ObjectSizer |
REFLECTION_SIZE
An implementation of
ObjectSizer that calculates an accurate size for each object that
it sizes. |
static ObjectSizer |
SIZE_CLASS_ONCE
An implementation of
ObjectSizer that calculates an accurate size of the first instance
of each class that is put in the cache. |
| Modifier and Type | Method and Description |
|---|---|
int |
sizeof(Object o) |
@Immutable static final ObjectSizer SIZE_CLASS_ONCE
ObjectSizer that calculates an accurate size of the first instance
of each class that is put in the cache. After the first instance, it will return the same size
for every instance of that class.
This sizer is a compromise between generating accurate sizes for every object and performance.
It should work well if the keys and values in the region don't vary greatly in size. For
accurate sizing of every instance use REFLECTION_SIZE instead.
This sizer does generate an accurate size for strings and byte arrays every time, because there
is very little performance impact from sizing these objects.@Immutable static final ObjectSizer REFLECTION_SIZE
ObjectSizer that calculates an accurate size for each object that
it sizes.
This sizer will add up the sizes of all objects that are reachable from the keys and values in
your region by non-static fields.
For objects that are all approximately the same size, consider using SIZE_CLASS_ONCE.
It will have much better performance.@Immutable static final ObjectSizer DEFAULT
SIZE_CLASS_ONCEint sizeof(Object o)