org.apache.ode.utils

## Interface WatchDog.Observer<A>

- All Known Implementing Classes:
    DeploymentPoller.DDWatchDogObserver, WatchDog.DefaultObserver
  Enclosing class:
    WatchDog<T,C extends WatchDog.Observer>

      public static interface WatchDog.Observer<A>

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `A` | `get()`
    `java.util.concurrent.locks.Lock` | `getLock()`
    `void` | `init()` Called by `WatchDog.check()` if the underlying object is not `initialized` and the `WatchDog.Mutable.exists()` resource does not exist}.
    `boolean` | `isInitialized()`
    `void` | `onDelete()` Called only if the resource previously existed and now does not exist.
    `void` | `onUpdate()` Called only if the resource previously existed but the `WatchDog.Mutable.lastModified()` timestamp has changed (greater than the previous value).
    `void` | `reset()`

- - ### Method Detail

    - #### isInitialized

          boolean isInitialized()

    - #### init

          void init()

      Called by `WatchDog.check()` if the underlying object is not `initialized` and the `WatchDog.Mutable.exists()` resource does not exist}.
      This method might called to reset the underlying object.
      Throws:
        `java.lang.Exception`

    - #### reset

          void reset()

    - #### onDelete

          void onDelete()

      Called only if the resource previously existed and now does not exist.
      The default implementation invokes `init()` .
      Throws:
        `java.lang.Exception`

    - #### onUpdate

          void onUpdate()

      Called only if the resource previously existed but the `WatchDog.Mutable.lastModified()` timestamp has changed (greater than the previous value).
      The default implementation invokes `init()` .
      Throws:
        `java.lang.Exception`

    - #### getLock

          java.util.concurrent.locks.Lock getLock()

    - #### get

          A get()