Package com.ibatis.sqlmap.engine.cache.memory

Class MemoryCacheLevel

java.lang.Object

com.ibatis.sqlmap.engine.cache.memory.MemoryCacheLevel

public final class MemoryCacheLevel
extends Object

An enumeration for the values for the memory cache levels.

Field Summary

Fields

Modifier and Type	Field	Description
static final MemoryCacheLevel	SOFT	Constant for soft caching.
static final MemoryCacheLevel	STRONG	Constant for strong caching.
static final MemoryCacheLevel	WEAK	Constant for weak caching This cache model is probably the best choice in most cases.

Method Summary

Modifier and Type	Method	Description
static MemoryCacheLevel	getByReferenceType(String refType)	Gets a MemoryCacheLevel by name.
String	getReferenceType()	Getter for the reference type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

WEAK

public static final MemoryCacheLevel WEAK

Constant for weak caching This cache model is probably the best choice in most cases. It will increase performance for popular results, but it will absolutely release the memory to be used in allocating other objects, assuming that the results are not currently in use.

SOFT

public static final MemoryCacheLevel SOFT

Constant for soft caching. This cache model will reduce the likelihood of running out of memory in case the results are not currently in use and the memory is needed for other objects. However, this is not the most aggressive cache-model in that regard. Hence, memory still might be allocated and unavailable for more important objects.

STRONG

public static final MemoryCacheLevel STRONG

Constant for strong caching. This cache model will guarantee that the results stay in memory until the cache is explicitly flushed. This is ideal for results that are:

1. very small
2. absolutely static
3. used very often

The advantage is that performance will be very good for this particular query. The disadvantage is that if the memory used by these results is needed, then it will not be released to make room for other objects (possibly more important objects).

Method Details

getReferenceType

public String getReferenceType()

Getter for the reference type.

Returns:

the type of reference type used

getByReferenceType

public static MemoryCacheLevel getByReferenceType(String refType)

Gets a MemoryCacheLevel by name.

Parameters:

refType - the name of the reference type

Returns:

the MemoryCacheLevel that the name indicates