alluxio.worker.block

Class BlockMetadataView

java.lang.Object

alluxio.worker.block.BlockMetadataView

Direct Known Subclasses:

BlockMetadataAllocatorView, BlockMetadataEvictorView

public abstract class BlockMetadataView
extends Object

This class is an abstract class for allocators and evictors to extend to provide limited access to block metadata.

Field Summary

Fields

Modifier and Type	Field and Description
protected BlockMetadataManager	mMetadataManager The BlockMetadataManager this view is derived from.
protected boolean	mUseReservedSpace

Constructor Summary

Constructors

Constructor and Description
BlockMetadataView(BlockMetadataManager manager) Creates a new instance of BlockMetadataView.
BlockMetadataView(BlockMetadataManager manager, boolean useReservedSpace) Creates a new instance of BlockMetadataView.

Method Summary

Modifier and Type	Method and Description
StorageTierView	getNextTier(StorageTierView tierView) Gets the next storage tier view.
StorageTierView	getTierView(String tierAlias) Provides StorageTierView given tierAlias.
List<StorageTierView>	getTierViews() Gets all tierViews under this storage metadata view.
List<StorageTierView>	getTierViewsBelow(String tierAlias) Gets all tierViews before certain tierView.
protected abstract void	initializeView() Used to initialize the view based on the current metadata status.
BlockMetadataView	refreshView() Used to refresh the view based on current metadata status.

Methods inherited from class java.lang.Object

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

Field Detail

mMetadataManager

protected final BlockMetadataManager mMetadataManager

The BlockMetadataManager this view is derived from.

mUseReservedSpace

protected final boolean mUseReservedSpace

Constructor Detail

BlockMetadataView

public BlockMetadataView(BlockMetadataManager manager)

Creates a new instance of BlockMetadataView.

Parameters:

manager - which the view should be constructed from

BlockMetadataView

public BlockMetadataView(BlockMetadataManager manager,
                         boolean useReservedSpace)

Creates a new instance of BlockMetadataView.

Parameters:

manager - which the view should be constructed from

useReservedSpace - whether to include reserved space in available bytes

Method Detail

getTierView

public StorageTierView getTierView(String tierAlias)

Provides StorageTierView given tierAlias. Throws an IllegalArgumentException if the tierAlias is not found.

Parameters:

tierAlias - the alias of this tierView

Returns:

the StorageTierView object associated with the alias

getTierViews

public List<StorageTierView> getTierViews()

Gets all tierViews under this storage metadata view.

Returns:

the list of StorageTierViews

getNextTier

@Nullable
public StorageTierView getNextTier(StorageTierView tierView)

Gets the next storage tier view.

Parameters:

tierView - the storage tier view

Returns:

the next storage tier view, null if this is the last tier view

getTierViewsBelow

public List<StorageTierView> getTierViewsBelow(String tierAlias)

Gets all tierViews before certain tierView. Throws an IllegalArgumentException if the tierAlias is not found.

Parameters:

tierAlias - the alias of a tierView

Returns:

the list of StorageTierView

initializeView

protected abstract void initializeView()

Used to initialize the view based on the current metadata status.

refreshView

public BlockMetadataView refreshView()

Used to refresh the view based on current metadata status.

Returns:

the refreshed view instance