## org.apache.tools.ant
Interface BuildListener

All Superinterfaces:
  java.util.EventListener

All Known Subinterfaces:
  BuildLogger, SubBuildListener

All Known Implementing Classes:
  AnsiColorLogger, AntClassLoader, AntClassLoader2, AntSoundPlayer, BigProjectLogger, CommonsLoggingListener, DefaultLogger, Log4jListener, MailLogger, ModifiedSelector, NoBannerLogger, Recorder, RecorderEntry, TimestampedLogger, XmlLogger

    public interface BuildListener

extends java.util.EventListener

Instances of classes that implement this interface can register to be notified when things happened during a build.

See Also:
  `BuildEvent`, `Project.addBuildListener(BuildListener)`

Method Summary
`void` `buildFinished(BuildEvent event)` Signals that the last target has finished.
`void` `buildStarted(BuildEvent event)` Signals that a build has started.
`void` `messageLogged(BuildEvent event)` Signals a message logging event.
`void` `targetFinished(BuildEvent event)` Signals that a target has finished.
`void` `targetStarted(BuildEvent event)` Signals that a target is starting.
`void` `taskFinished(BuildEvent event)` Signals that a task has finished.
`void` `taskStarted(BuildEvent event)` Signals that a task is starting.

Method Detail

### buildStarted

    void buildStarted(BuildEvent event)

  Signals that a build has started. This event is fired before any targets have started.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.

### buildFinished

    void buildFinished(BuildEvent event)

  Signals that the last target has finished. This event will still be fired if an error occurred during the build.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getException()`

### targetStarted

    void targetStarted(BuildEvent event)

  Signals that a target is starting.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getTarget()`

### targetFinished

    void targetFinished(BuildEvent event)

  Signals that a target has finished. This event will still be fired if an error occurred during the build.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getException()`

### taskStarted

    void taskStarted(BuildEvent event)

  Signals that a task is starting.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getTask()`

### taskFinished

    void taskFinished(BuildEvent event)

  Signals that a task has finished. This event will still be fired if an error occurred during the build.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getException()`

### messageLogged

    void messageLogged(BuildEvent event)

  Signals a message logging event.

  Parameters:
    `event` - An event with any relevant extra information. Must not be `null`.
  See Also:
    `BuildEvent.getMessage()`, `BuildEvent.getException()`, `BuildEvent.getPriority()`