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

static MemoryCacheLevel	SOFT Constant for soft caching.
static MemoryCacheLevel	STRONG Constant for strong caching.
static MemoryCacheLevel	WEAK Constant for weak caching This cache model is probably the best choice in most cases.

Method Summary

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 Detail

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 Detail

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