# Class GzipInterceptor

java.lang.Object
org.apache.catalina.tribes.group.ChannelInterceptorBase
org.apache.catalina.tribes.group.interceptors.GzipInterceptor

All Implemented Interfaces:
  `ChannelInterceptor, GzipInterceptorMBean, Heartbeat, MembershipListener`

public class GzipInterceptor extends ChannelInterceptorBase implements GzipInterceptorMBean

- ## Nested Class Summary

  ### Nested classes/interfaces inherited from interface ChannelInterceptor

  `ChannelInterceptor.InterceptorEvent`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `DEFAULT_BUFFER_SIZE`
  `static final int`
  `DEFAULT_OPTION_COMPRESSION_ENABLE`
  `protected static final StringManager`
  `sm`

  ### Fields inherited from class ChannelInterceptorBase

  `optionFlag`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `GzipInterceptor()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static byte[]`
  `compress(byte[] data)`
  `static byte[]`
  `decompress(byte[] data)`
  `long`
  `getCompressedSizeRX()`
  `long`
  `getCompressedSizeTX()`
  `int`
  `getCompressionMinSize()`
  `int`
  `getCount()`
  `int`
  `getCountCompressedRX()`
  `int`
  `getCountCompressedTX()`
  `int`
  `getCountUncompressedRX()`
  `int`
  `getCountUncompressedTX()`
  `int`
  `getInterval()`
  `long`
  `getSizeRX()`
  `long`
  `getSizeTX()`
  `boolean`
  `getStatsEnabled()`
  `long`
  `getUncompressedSizeRX()`
  `long`
  `getUncompressedSizeTX()`
  `void`
  `messageReceived(ChannelMessage msg)`
  The `messageReceived` is invoked when a message is received.
  `void`
  `report()`
  `void`
  `reset()`
  `void`
  `sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload)`
  The `sendMessage` method is called when a message is being sent to one more destinations.
  `void`
  `setCompressionMinSize(int compressionMinSize)`
  Set the minimum payload size for compression to be enabled.
  `void`
  `setInterval(int interval)`
  If statistics collection is enabled, set the number of messages between statistics reports being written to the log.
  `void`
  `setStatsEnabled(boolean statsEnabled)`
  Configure whether the interceptor collects statistics.

  ### Methods inherited from class ChannelInterceptorBase

  `fireInterceptorEvent, getChannel, getLocalMember, getMember, getMembers, getNext, getOptionFlag, getPrevious, hasMembers, heartbeat, memberAdded, memberDisappeared, okToProcess, setChannel, setNext, setOptionFlag, setPrevious, start, stop`

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods inherited from interface GzipInterceptorMBean

  `getOptionFlag, setOptionFlag`

- ## Field Details

  - ### sm

    protected static final StringManager sm

  - ### DEFAULT_BUFFER_SIZE

    public static final int DEFAULT_BUFFER_SIZE
    See Also:
      - Constant Field Values

  - ### DEFAULT_OPTION_COMPRESSION_ENABLE

    public static final int DEFAULT_OPTION_COMPRESSION_ENABLE
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### GzipInterceptor

    public GzipInterceptor()

- ## Method Details

  - ### sendMessage

    public void sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload) throws ChannelException
    Description copied from interface: `ChannelInterceptor`
    The `sendMessage` method is called when a message is being sent to one more destinations. The interceptor can modify any of the parameters and then pass on the message down the stack by invoking `getNext().sendMessage(destination,msg,payload)`.

    Alternatively the interceptor can stop the message from being sent by not invoking `getNext().sendMessage(destination,msg,payload)`.

    If the message is to be sent asynchronous the application can be notified of completion and errors by passing in an error handler attached to a payload object.

    The ChannelMessage.getAddress contains Channel.getLocalMember, and can be overwritten to simulate a message sent from another node.

    Specified by:
      `sendMessage` in interface `ChannelInterceptor`
    Overrides:
      `sendMessage` in class `ChannelInterceptorBase`
    Parameters:
      `destination` - Member[] - the destination for this message
      `msg` - ChannelMessage - the message to be sent
      `payload` - InterceptorPayload - the payload, carrying an error handler and future useful data, can be null
    Throws:
      `ChannelException` - if a serialization error happens.
    See Also:
      - `ErrorHandler`
      - `InterceptorPayload`

  - ### messageReceived

    public void messageReceived(ChannelMessage msg)
    Description copied from interface: `ChannelInterceptor`
    The `messageReceived` is invoked when a message is received. `ChannelMessage.getAddress()` is the sender, or the reply-to address if it has been overwritten.
    Specified by:
      `messageReceived` in interface `ChannelInterceptor`
    Overrides:
      `messageReceived` in class `ChannelInterceptorBase`
    Parameters:
      `msg` - ChannelMessage

  - ### compress

    public static byte[] compress(byte[] data) throws IOException
    Throws:
      `IOException`

  - ### decompress

    public static byte[] decompress(byte[] data) throws IOException
    Parameters:
      `data` - Data to decompress
    Returns:
      Decompressed data
    Throws:
      `IOException` - Compression error

  - ### report

    public void report()
    Specified by:
      `report` in interface `GzipInterceptorMBean`

  - ### getCompressionMinSize

    public int getCompressionMinSize()
    Specified by:
      `getCompressionMinSize` in interface `GzipInterceptorMBean`
    Returns:
      the minimum payload size for compression to be enabled.

  - ### setCompressionMinSize

    public void setCompressionMinSize(int compressionMinSize)
    Description copied from interface: `GzipInterceptorMBean`
    Set the minimum payload size for compression to be enabled. A value of zero or less means compression will always be used. If not explicitly configured, a default of zero will be used.
    Specified by:
      `setCompressionMinSize` in interface `GzipInterceptorMBean`
    Parameters:
      `compressionMinSize` - The new minimum payload size

  - ### getStatsEnabled

    public boolean getStatsEnabled()
    Specified by:
      `getStatsEnabled` in interface `GzipInterceptorMBean`
    Returns:
      `true` if the interceptor is configured to collect statistics, otherwise `false`

  - ### setStatsEnabled

    public void setStatsEnabled(boolean statsEnabled)
    Description copied from interface: `GzipInterceptorMBean`
    Configure whether the interceptor collects statistics.
    Specified by:
      `setStatsEnabled` in interface `GzipInterceptorMBean`
    Parameters:
      `statsEnabled` - `true` to enable statistics collections, otherwise `false`

  - ### getInterval

    public int getInterval()
    Specified by:
      `getInterval` in interface `GzipInterceptorMBean`
    Returns:
      If statistics collection is enabled, the number of messages between statistics reports being written to the log.

  - ### setInterval

    public void setInterval(int interval)
    Description copied from interface: `GzipInterceptorMBean`
    If statistics collection is enabled, set the number of messages between statistics reports being written to the log. A value of zero or less means no statistics reports are written.
    Specified by:
      `setInterval` in interface `GzipInterceptorMBean`
    Parameters:
      `interval` - The new interval between reports

  - ### getCount

    public int getCount()
    Specified by:
      `getCount` in interface `GzipInterceptorMBean`

  - ### getCountCompressedTX

    public int getCountCompressedTX()
    Specified by:
      `getCountCompressedTX` in interface `GzipInterceptorMBean`

  - ### getCountUncompressedTX

    public int getCountUncompressedTX()
    Specified by:
      `getCountUncompressedTX` in interface `GzipInterceptorMBean`

  - ### getCountCompressedRX

    public int getCountCompressedRX()
    Specified by:
      `getCountCompressedRX` in interface `GzipInterceptorMBean`

  - ### getCountUncompressedRX

    public int getCountUncompressedRX()
    Specified by:
      `getCountUncompressedRX` in interface `GzipInterceptorMBean`

  - ### getSizeTX

    public long getSizeTX()
    Specified by:
      `getSizeTX` in interface `GzipInterceptorMBean`

  - ### getCompressedSizeTX

    public long getCompressedSizeTX()
    Specified by:
      `getCompressedSizeTX` in interface `GzipInterceptorMBean`

  - ### getUncompressedSizeTX

    public long getUncompressedSizeTX()
    Specified by:
      `getUncompressedSizeTX` in interface `GzipInterceptorMBean`

  - ### getSizeRX

    public long getSizeRX()
    Specified by:
      `getSizeRX` in interface `GzipInterceptorMBean`

  - ### getCompressedSizeRX

    public long getCompressedSizeRX()
    Specified by:
      `getCompressedSizeRX` in interface `GzipInterceptorMBean`

  - ### getUncompressedSizeRX

    public long getUncompressedSizeRX()
    Specified by:
      `getUncompressedSizeRX` in interface `GzipInterceptorMBean`

  - ### reset

    public void reset()
    Specified by:
      `reset` in interface `GzipInterceptorMBean`