ZlibDecoder (Netty API Reference (4.2.1.Final))

java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelInboundHandlerAdapter
  - - io.netty.handler.codec.ByteToMessageDecoder
    - - io.netty.handler.codec.compression.ZlibDecoder

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler

Direct Known Subclasses:

JdkZlibDecoder, JZlibDecoder
```
public abstract class ZlibDecoder
extends ByteToMessageDecoder
```
Decompresses a ByteBuf using the deflate algorithm.

Nested Class Summary
- Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder
  ByteToMessageDecoder.Cumulator
- Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
  ChannelHandler.Sharable

Field Summary

Fields
Modifier and Type Field Description

protected int maxAllocation
Maximum allowed size of the decompression buffer.
- Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder
  COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors
Constructor Description

ZlibDecoder()
Same as ZlibDecoder(int) with maxAllocation = 0.

ZlibDecoder(int maxAllocation)
Construct a new ZlibDecoder.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`decompressionBufferExhausted(ByteBuf buffer)`	Called when the decompression buffer cannot be expanded further.
`abstract boolean`	`isClosed()`	Returns `true` if and only if the end of the compressed stream has been reached.
`protected ByteBuf`	`prepareDecompressBuffer(ChannelHandlerContext ctx, ByteBuf buffer, int preferredSize)`	Allocate or expand the decompression buffer, without exceeding the maximum allocation.

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder
actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decode, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter
channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter
ensureNotSharable, handlerAdded, isSharable

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

Methods inherited from interface io.netty.channel.ChannelHandler
handlerAdded

- Field Detail
  - maxAllocation
```
protected final int maxAllocation
```
    Maximum allowed size of the decompression buffer.
- Constructor Detail
  - ZlibDecoder
```
public ZlibDecoder()
```
    Same as ZlibDecoder(int) with maxAllocation = 0.
  - ZlibDecoder
```
public ZlibDecoder(int maxAllocation)
```
    Construct a new ZlibDecoder.
    
    Parameters:
    
    maxAllocation - Maximum size of the decompression buffer. Must be >= 0. If zero, maximum size is decided by the ByteBufAllocator.
- Method Detail
  - isClosed
```
public abstract boolean isClosed()
```
    Returns true if and only if the end of the compressed stream has been reached.
  - prepareDecompressBuffer
```
protected ByteBuf prepareDecompressBuffer(ChannelHandlerContext ctx,
                                          ByteBuf buffer,
                                          int preferredSize)
```
    Allocate or expand the decompression buffer, without exceeding the maximum allocation. Calls decompressionBufferExhausted(ByteBuf) if the buffer is full and cannot be expanded further.
  - decompressionBufferExhausted
```
protected void decompressionBufferExhausted(ByteBuf buffer)
```
    Called when the decompression buffer cannot be expanded further. Default implementation is a no-op, but subclasses can override in case they want to do something before the DecompressionException is thrown, such as log the data that was decompressed so far.

	
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