WatchStats (Apache ZooKeeper - Server 3.9.1 API)

java.lang.Object
- org.apache.zookeeper.server.watch.WatchStats

```
public final class WatchStats
extends Object
```
Statistics for multiple different watches on one node.

Field Summary

Fields
Modifier and Type Field Description

static WatchStats NONE
Stats that have no watchers attached.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`WatchStats`	`addMode(WatcherMode mode)`	Compute stats after given mode attached to node.
`boolean`	`hasMode(WatcherMode mode)`	Check whether given mode is attached to this node.
`WatchStats`	`removeMode(WatcherMode mode)`	Compute stats after given mode removed from node.

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

- Field Detail
  - NONE
```
public static final WatchStats NONE
```
    Stats that have no watchers attached.
    This could be used as start point to compute new stats using addMode(WatcherMode).
- Method Detail
  - addMode
```
public WatchStats addMode(WatcherMode mode)
```
    Compute stats after given mode attached to node.
    
    Parameters:
    
    mode - watcher mode
    
    Returns:
    
    a new stats if given mode is not attached to this node before, otherwise old stats
  - removeMode
```
public WatchStats removeMode(WatcherMode mode)
```
    Compute stats after given mode removed from node.
    
    Parameters:
    
    mode - watcher mode
    
    Returns:
    
    null if given mode is the last attached mode, otherwise a new stats
  - hasMode
```
public boolean hasMode(WatcherMode mode)
```
    Check whether given mode is attached to this node.
    
    Parameters:
    
    mode - watcher mode
    
    Returns:
    
    true if given mode is attached to this node.