CacheStatistics (Spring Boot API)

所有已知实现类:
DefaultCacheStatistics
```
public interface CacheStatistics
```
Snapshot of the statistics of a given cache. CacheStatistics instances have a very short life as it represents the statistics of a cache at one particular point in time.
从以下版本开始:
1.3.0

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Double`	`getHitRatio()`	Return the ratio of cache requests which were hits as a value between 0 and 1 where 0 means that the hit ratio is 0% and 1 means it is 100%.
`Double`	`getMissRatio()`	Return the ratio of cache requests which were misses as value between 0 and 1 where 0 means that the miss ratio is 0% and 1 means it is 100%.
`Long`	`getSize()`	Return the size of the cache or `null` if that information is not available.
`Collection<Metric<?>>`	`toMetrics(String prefix)`	Generate the relevant `Metric` instances based on the specified prefix.

- 方法详细资料
  - toMetrics
```
Collection<Metric<?>> toMetrics(String prefix)
```
    Generate the relevant Metric instances based on the specified prefix.
    参数:
    prefix - the metrics prefix (ends with '.')
    返回:
    the metrics corresponding to this instance
  - getSize
```
Long getSize()
```
    Return the size of the cache or null if that information is not available.
    返回:
    the size of the cache or null
  - getHitRatio
```
Double getHitRatio()
```
    Return the ratio of cache requests which were hits as a value between 0 and 1 where 0 means that the hit ratio is 0% and 1 means it is 100%.
    This may also return null if the cache-specifics statistics does not provide the necessary information
    返回:
    the hit ratio or null
  - getMissRatio
```
Double getMissRatio()
```
    Return the ratio of cache requests which were misses as value between 0 and 1 where 0 means that the miss ratio is 0% and 1 means it is 100%.
    This may also return null if the cache-specifics statistics does not provide the necessary information
    返回:
    the miss ratio or null