org.apache.cassandra.io.util
Class DiskAwareRunnable

java.lang.Object
  org.apache.cassandra.utils.WrappedRunnable
      org.apache.cassandra.io.util.DiskAwareRunnable

All Implemented Interfaces:

java.lang.Runnable

Direct Known Subclasses:

AbstractCompactionTask

public abstract class DiskAwareRunnable
extends WrappedRunnable

Constructor Summary

DiskAwareRunnable()

Method Summary

abstract long	getExpectedWriteSize() Get expected write size to determine which disk to use for this task.
boolean	reduceScopeForLimitedSpace() Called if no disk is available with free space for the full write size.
protected void	runMayThrow() Run this task after selecting the optimal disk for it
protected abstract void	runWith(java.io.File dataDirectory) Executes this task on given dataDirectory.

Methods inherited from class org.apache.cassandra.utils.WrappedRunnable

run

Methods inherited from class java.lang.Object

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

Constructor Detail

DiskAwareRunnable

public DiskAwareRunnable()

Method Detail

runMayThrow

protected void runMayThrow()
                    throws java.lang.Exception

Run this task after selecting the optimal disk for it

Specified by:

runMayThrow in class WrappedRunnable

Throws:

java.lang.Exception

runWith

protected abstract void runWith(java.io.File dataDirectory)
                         throws java.lang.Exception

Executes this task on given dataDirectory.

Parameters:

dataDirectory - data directory to work on

Throws:

java.lang.Exception

getExpectedWriteSize

public abstract long getExpectedWriteSize()

Get expected write size to determine which disk to use for this task.

Returns:

expected size in bytes this task will write to disk.

reduceScopeForLimitedSpace

public boolean reduceScopeForLimitedSpace()

Called if no disk is available with free space for the full write size.

Returns:

true if the scope of the task was successfully reduced.