```
public class CompressionRatio
extends java.lang.Object
```
This class is used to count, compute and persist the compression ratio of tsfiles. Whenever the task of closing a file ends, the compression ratio of the file is calculated based on the total MemTable size and the total size of the tsfile on disk. compressionRatioSum records the sum of these compression ratios, and records the number of closed file tasks. When the compression rate of the current system is obtained, the average compression ratio is returned as the result, that is compressionRatioSum/. At the same time, each time the compression ratio statistics are updated, these two parameters are persisted on disk for system recovery.

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getCompressionRatioSum()`
`static CompressionRatio`	`getInstance()`
`double`	`getRatio()`	Get the average compression ratio for all closed files
`void`	`updateRatio(double currentCompressionRatio)`	Whenever the task of closing a file ends, the compression ratio of the file is calculated and call this method.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Class CompressionRatio