org.rrd4j.core.RrdSyncThreadPool

public class RrdSyncThreadPool
extends Object

Thread pool used by RrdNioBackend instances to periodically sync the mapped file to disk. Note that instances of RrdSyncThreadPool must be disposed of by calling shutdown().

For ease of use in standalone applications, clients may choose to register a shutdown hook by calling registerShutdownHook(). However, in web applications it is best to explicitly shutdown() the pool when the application is un-deployed, usually within a javax.servlet.ServletContextListener.

Since:: 2.2

Nested Class Summary

Nested Classes

Modifier and Type Class Description

(package private) static class RrdSyncThreadPool.DaemonThreadFactory
Daemon thread factory used by the monitor executors.

Constructor Summary

Constructors
Constructor	Description
`RrdSyncThreadPool()`	Creates a new RrdSyncThreadPool with a default pool size of 6.
`RrdSyncThreadPool(int syncPoolSize)`	Creates a new RrdSyncThreadPool with the given pool size.
`RrdSyncThreadPool(int syncPoolSize, ThreadFactory threadFactory)`	Creates a new RrdSyncThreadPool with the given pool size.
`RrdSyncThreadPool(ScheduledExecutorService syncExecutor)`	Creates a new RrdSyncThreadPool with a user-provided ScheduledExecutorService.

Method Summary

Modifier and Type	Method	Description
`RrdSyncThreadPool`	`registerShutdownHook()`	Registers a shutdown hook that destroys the underlying thread pool when when the JVM is about to quit.
`(package private) ScheduledFuture<?>`	`scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit)`
`void`	`shutdown()`	Shuts down this thread pool in an orderly manner.
`void`	`unregisterShutdownHook()`	Unregisters the shutdown hook installed by `registerShutdownHook()`.

Methods inherited from class java.lang.Object

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

Constructor Details
- RrdSyncThreadPool
  
  public RrdSyncThreadPool()
  
  Creates a new RrdSyncThreadPool with a default pool size of 6.
- RrdSyncThreadPool
  
  public RrdSyncThreadPool(ScheduledExecutorService syncExecutor)
  
  Creates a new RrdSyncThreadPool with a user-provided ScheduledExecutorService.
  
  Parameters:
  
  syncExecutor - the ScheduledExecutorService to use for sync'ing mapped files to disk
- RrdSyncThreadPool
  
  public RrdSyncThreadPool(int syncPoolSize)
  
  Creates a new RrdSyncThreadPool with the given pool size.
  
  Parameters:
  
  syncPoolSize - the number of threads to use to sync the mapped file to disk
- RrdSyncThreadPool
  
  public RrdSyncThreadPool(int syncPoolSize, ThreadFactory threadFactory)
  
  Creates a new RrdSyncThreadPool with the given pool size. Threads will be created by threadFactory.
  
  Parameters:
  
  syncPoolSize - the number of threads to use to sync the mapped file to disk
  
  threadFactory - the ThreadFactory to use for creating threads
Method Details
- registerShutdownHook
  
  public RrdSyncThreadPool registerShutdownHook()
  
  Registers a shutdown hook that destroys the underlying thread pool when when the JVM is about to quit.
  
  Returns:
  
  this
  
  See Also:
  
  unregisterShutdownHook()
- unregisterShutdownHook
  
  public void unregisterShutdownHook()
  
  Unregisters the shutdown hook installed by registerShutdownHook(). Has no effect if the hook is not currently installed.
  
  See Also:
  
  unregisterShutdownHook()
- shutdown
  
  public void shutdown()
  
  Shuts down this thread pool in an orderly manner. Has no effect if it has already been called previously.
- scheduleWithFixedDelay
  
  ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit)

Class RrdSyncThreadPool

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Details

Method Details