org.apache.cassandra.concurrent

## Class DebuggableScheduledThreadPoolExecutor

- java.lang.Object
- - java.util.concurrent.AbstractExecutorService
  - - java.util.concurrent.ThreadPoolExecutor
    - - java.util.concurrent.ScheduledThreadPoolExecutor
      - - org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor

- All Implemented Interfaces:
    java.util.concurrent.Executor, java.util.concurrent.ExecutorService, java.util.concurrent.ScheduledExecutorService

      public class DebuggableScheduledThreadPoolExecutor
      extends java.util.concurrent.ScheduledThreadPoolExecutor

  Like DebuggableThreadPoolExecutor, DebuggableScheduledThreadPoolExecutor always logs exceptions from the tasks it is given, even if Future.get is never called elsewhere. DebuggableScheduledThreadPoolExecutor also catches exceptions during Task execution so that they don't supress subsequent invocations of the task. Finally, there is a special rejected execution handler for tasks rejected during the shutdown hook. For fire and forget tasks (like ref tidy) we can safely ignore the exceptions. For any callers that care to know their task was rejected we cancel passed task.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class java.util.concurrent.ThreadPoolExecutor

      `java.util.concurrent.ThreadPoolExecutor.AbortPolicy, java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy, java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy, java.util.concurrent.ThreadPoolExecutor.DiscardPolicy`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static java.util.concurrent.RejectedExecutionHandler` | `rejectedExecutionHandler`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DebuggableScheduledThreadPoolExecutor(int corePoolSize, java.lang.String threadPoolName, int priority)`
    `DebuggableScheduledThreadPoolExecutor(int corePoolSize, java.util.concurrent.ThreadFactory threadFactory)`
    `DebuggableScheduledThreadPoolExecutor(java.lang.String threadPoolName)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `afterExecute(java.lang.Runnable r, java.lang.Throwable t)`
    `java.util.concurrent.ScheduledFuture<?>` | `scheduleAtFixedRate(java.lang.Runnable command, long initialDelay, long period, java.util.concurrent.TimeUnit unit)`
    `java.util.concurrent.ScheduledFuture<?>` | `scheduleWithFixedDelay(java.lang.Runnable command, long initialDelay, long delay, java.util.concurrent.TimeUnit unit)`

    - ### Methods inherited from class java.util.concurrent.ScheduledThreadPoolExecutor

      `decorateTask, decorateTask, execute, getContinueExistingPeriodicTasksAfterShutdownPolicy, getExecuteExistingDelayedTasksAfterShutdownPolicy, getQueue, getRemoveOnCancelPolicy, schedule, schedule, setContinueExistingPeriodicTasksAfterShutdownPolicy, setExecuteExistingDelayedTasksAfterShutdownPolicy, setRemoveOnCancelPolicy, shutdown, shutdownNow, submit, submit, submit`

    - ### Methods inherited from class java.util.concurrent.ThreadPoolExecutor

      `allowCoreThreadTimeOut, allowsCoreThreadTimeOut, awaitTermination, beforeExecute, finalize, getActiveCount, getCompletedTaskCount, getCorePoolSize, getKeepAliveTime, getLargestPoolSize, getMaximumPoolSize, getPoolSize, getRejectedExecutionHandler, getTaskCount, getThreadFactory, isShutdown, isTerminated, isTerminating, prestartAllCoreThreads, prestartCoreThread, purge, remove, setCorePoolSize, setKeepAliveTime, setMaximumPoolSize, setRejectedExecutionHandler, setThreadFactory, terminated, toString`

    - ### Methods inherited from class java.util.concurrent.AbstractExecutorService

      `invokeAll, invokeAll, invokeAny, invokeAny, newTaskFor, newTaskFor`

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

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

    - ### Methods inherited from interface java.util.concurrent.ExecutorService

      `awaitTermination, invokeAll, invokeAll, invokeAny, invokeAny, isShutdown, isTerminated`

- - ### Field Detail

    - #### rejectedExecutionHandler

          public static final java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler

  - ### Constructor Detail

    - #### DebuggableScheduledThreadPoolExecutor

          public DebuggableScheduledThreadPoolExecutor(int corePoolSize,
                                                       java.lang.String threadPoolName,
                                                       int priority)

    - #### DebuggableScheduledThreadPoolExecutor

          public DebuggableScheduledThreadPoolExecutor(int corePoolSize,
                                                       java.util.concurrent.ThreadFactory threadFactory)

    - #### DebuggableScheduledThreadPoolExecutor

          public DebuggableScheduledThreadPoolExecutor(java.lang.String threadPoolName)

  - ### Method Detail

    - #### afterExecute

          public void afterExecute(java.lang.Runnable r,
                                   java.lang.Throwable t)

      Overrides:
        `afterExecute` in class `java.util.concurrent.ThreadPoolExecutor`

    - #### scheduleAtFixedRate

          public java.util.concurrent.ScheduledFuture<?> scheduleAtFixedRate(java.lang.Runnable command,
                                                                             long initialDelay,
                                                                             long period,
                                                                             java.util.concurrent.TimeUnit unit)

      Specified by:
        `scheduleAtFixedRate` in interface `java.util.concurrent.ScheduledExecutorService`
      Overrides:
        `scheduleAtFixedRate` in class `java.util.concurrent.ScheduledThreadPoolExecutor`

    - #### scheduleWithFixedDelay

          public java.util.concurrent.ScheduledFuture<?> scheduleWithFixedDelay(java.lang.Runnable command,
                                                                                long initialDelay,
                                                                                long delay,
                                                                                java.util.concurrent.TimeUnit unit)

      Specified by:
        `scheduleWithFixedDelay` in interface `java.util.concurrent.ScheduledExecutorService`
      Overrides:
        `scheduleWithFixedDelay` in class `java.util.concurrent.ScheduledThreadPoolExecutor`

Copyright © 2018 The Apache Software Foundation