org.apache.log4j.net

## Class UDPAppender

- java.lang.Object
- - org.apache.log4j.AppenderSkeleton
  - - org.apache.log4j.net.UDPAppender

- All Implemented Interfaces:
    org.apache.log4j.Appender, NetworkBased, PortBased, org.apache.log4j.spi.OptionHandler

      public class UDPAppender
      extends org.apache.log4j.AppenderSkeleton
      implements PortBased

  Sends log information as a UDP datagrams.

  The UDPAppender is meant to be used as a diagnostic logging tool so that logging can be monitored by a simple UDP client.

  Messages are not sent as LoggingEvent objects but as text after applying the designated Layout.

  The port and remoteHost properties can be set in configuration properties. By setting the remoteHost to a broadcast address any number of clients can listen for log messages.

  This was inspired and really extended/copied from `SocketAppender`. Please see the docs for the proper credit to the authors of that class.

  Author:
    Kevin Brown, Scott Deboy <sdeboy@apache.org>

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `DEFAULT_PORT` The default port number for the UDP packets, 9991.
    `static String` | `ZONE` The MulticastDNS zone advertised by a UDPAppender

    - ### Fields inherited from class org.apache.log4j.AppenderSkeleton

      `closed, errorHandler, headFilter, layout, name, tailFilter, threshold`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `UDPAppender()`
    `UDPAppender(InetAddress address, int port)` Sends UDP packets to the `address` and `port`.
    `UDPAppender(String host, int port)` Sends UDP packets to the `address` and `port`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `activateOptions()` Open the UDP sender for the RemoteHost and Port.
    `void` | `append(org.apache.log4j.spi.LoggingEvent event)`
    `void` | `cleanUp()` Close the UDP Socket and release the underlying connector thread if it has been created
    `void` | `close()` Close this appender.
    `String` | `getApplication()` Returns value of the App option.
    `String` | `getEncoding()` Returns value of the Encoding option.
    `int` | `getPort()` Returns value of the Port option.
    `String` | `getRemoteHost()` Returns value of the RemoteHost option.
    `boolean` | `isActive()` Get if item is active.
    `boolean` | `isAdvertiseViaMulticastDNS()`
    `boolean` | `requiresLayout()` The UDPAppender uses layouts.
    `void` | `setAdvertiseViaMulticastDNS(boolean advertiseViaMulticastDNS)`
    `void` | `setApplication(String app)` The App option takes a string value which should be the name of the application getting logged.
    `void` | `setEncoding(String encoding)` The Encoding option specifies how the bytes are encoded.
    `void` | `setPort(int port)` The Port option takes a positive integer representing the port where UDP packets will be sent.
    `void` | `setRemoteHost(String host)` The RemoteHost option takes a string value which should be the host name or ipaddress to send the UDP packets.

    - ### Methods inherited from class org.apache.log4j.AppenderSkeleton

      `addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setErrorHandler, setLayout, setName, setThreshold`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.apache.log4j.net.NetworkBased

      `getName`

- - ### Field Detail

    - #### DEFAULT_PORT

          public static final int DEFAULT_PORT

      The default port number for the UDP packets, 9991.
      See Also:
        Constant Field Values

    - #### ZONE

          public static final String ZONE

      The MulticastDNS zone advertised by a UDPAppender
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### UDPAppender

          public UDPAppender()

    - #### UDPAppender

          public UDPAppender(InetAddress address,
                             int port)

      Sends UDP packets to the `address` and `port`.

    - #### UDPAppender

          public UDPAppender(String host,
                             int port)

      Sends UDP packets to the `address` and `port`.

  - ### Method Detail

    - #### activateOptions

          public void activateOptions()

      Open the UDP sender for the RemoteHost and Port.
      Specified by:
        `activateOptions` in interface `org.apache.log4j.spi.OptionHandler`
      Overrides:
        `activateOptions` in class `org.apache.log4j.AppenderSkeleton`

    - #### close

          public void close()

      Close this appender.

      This will mark the appender as closed and call then `cleanUp()` method.

      Specified by:
        `close` in interface `org.apache.log4j.Appender`

    - #### cleanUp

          public void cleanUp()

      Close the UDP Socket and release the underlying connector thread if it has been created

    - #### append

          public void append(org.apache.log4j.spi.LoggingEvent event)

      Specified by:
        `append` in class `org.apache.log4j.AppenderSkeleton`

    - #### isActive

          public boolean isActive()

      Description copied from interface: `NetworkBased`
      Get if item is active.
      Specified by:
        `isActive` in interface `NetworkBased`
      Returns:
        if true, item is active.

    - #### requiresLayout

          public boolean requiresLayout()

      The UDPAppender uses layouts. Hence, this method returns `true`.
      Specified by:
        `requiresLayout` in interface `org.apache.log4j.Appender`

    - #### setRemoteHost

          public void setRemoteHost(String host)

      The RemoteHost option takes a string value which should be the host name or ipaddress to send the UDP packets.

    - #### getRemoteHost

          public String getRemoteHost()

      Returns value of the RemoteHost option.

    - #### setApplication

          public void setApplication(String app)

      The App option takes a string value which should be the name of the application getting logged. If property was already set (via system property), don't set here.

    - #### getApplication

          public String getApplication()

      Returns value of the App option.

    - #### setEncoding

          public void setEncoding(String encoding)

      The Encoding option specifies how the bytes are encoded. If this option is not specified, the System encoding is used.

    - #### getEncoding

          public String getEncoding()

      Returns value of the Encoding option.

    - #### setPort

          public void setPort(int port)

      The Port option takes a positive integer representing the port where UDP packets will be sent.

    - #### getPort

          public int getPort()

      Returns value of the Port option.
      Specified by:
        `getPort` in interface `PortBased`
      Returns:
        int port number

    - #### setAdvertiseViaMulticastDNS

          public void setAdvertiseViaMulticastDNS(boolean advertiseViaMulticastDNS)

    - #### isAdvertiseViaMulticastDNS

          public boolean isAdvertiseViaMulticastDNS()

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