WriteBufferWaterMark (Netty API Reference (4.2.1.Final))

java.lang.Object
- io.netty.channel.WriteBufferWaterMark

```
public final class WriteBufferWaterMark
extends java.lang.Object
```
WriteBufferWaterMark is used to set low water mark and high water mark for the write buffer.
If the number of bytes queued in the write buffer exceeds the high water mark, Channel.isWritable() will start to return false.
If the number of bytes queued in the write buffer exceeds the high water mark and then dropped down below the low water mark, Channel.isWritable() will start to return true again.
Note that messages needs to be handled by the MessageSizeEstimator used by the channel for Channel.isWritable() to provide accurate back-pressure.

Field Summary

Fields
Modifier and Type Field Description

static WriteBufferWaterMark DEFAULT

Constructor Summary

Constructors
Constructor Description

WriteBufferWaterMark(int low, int high)
Create a new instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`high()`	Returns the high water mark for the write buffer.
`int`	`low()`	Returns the low water mark for the write buffer.
`java.lang.String`	`toString()`

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

- Field Detail
  - DEFAULT
```
public static final WriteBufferWaterMark DEFAULT
```
- Constructor Detail
  - WriteBufferWaterMark
```
public WriteBufferWaterMark(int low,
                            int high)
```
    Create a new instance.
    
    Parameters:
    
    low - low water mark for write buffer.
    
    high - high water mark for write buffer
- Method Detail
  - low
```
public int low()
```
    Returns the low water mark for the write buffer.
  - high
```
public int high()
```
    Returns the high water mark for the write buffer.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object