org.apache.jena.dboe.base.block

Class BlockMgrCache

java.lang.Object

org.apache.jena.dboe.base.block.BlockMgrSync

org.apache.jena.dboe.base.block.BlockMgrCache

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, BlockMgr

public class BlockMgrCache
extends BlockMgrSync

Caching block manager - this is an LRU cache

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	globalLogging

Method Summary

Modifier and Type	Method and Description
void	close() Close the block manager
void	free(Block block) Announce a block is no longer in use (i.e it's now freed)
Block	getRead(long id) Fetch a block, use for read only
Block	getWrite(long _id) Fetch a block, use for write and read - only inside "update"
void	overwrite(Block block) Replace the contents of a block slot with new contents.
Block	promote(Block block) Promote to writable : it's OK to promote an already writable block
void	resetAlloc(long boundary) Reset the allocation limit, should be a number previously obtained from allocLimit
void	sync() Sync the block manager
void	syncForce() Sync the block manager : system operation to ensure sync() is passed down
String	toString()
void	write(Block block) Write a block back - it still needs releasing.

Methods inherited from class org.apache.jena.dboe.base.block.BlockMgrSync

allocate, allocLimit, beginRead, beginUpdate, endRead, endUpdate, getLabel, getWrapped, isClosed, isEmpty, release, valid

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

globalLogging

public static boolean globalLogging

Method Detail

resetAlloc

public void resetAlloc(long boundary)

Description copied from interface: BlockMgr

Reset the allocation limit, should be a number previously obtained from allocLimit

Specified by:

resetAlloc in interface BlockMgr

Overrides:

resetAlloc in class BlockMgrSync

getRead

public Block getRead(long id)

Description copied from interface: BlockMgr

Fetch a block, use for read only

Specified by:

getRead in interface BlockMgr

Overrides:

getRead in class BlockMgrSync

getWrite

public Block getWrite(long _id)

Description copied from interface: BlockMgr

Fetch a block, use for write and read - only inside "update"

Specified by:

getWrite in interface BlockMgr

Overrides:

getWrite in class BlockMgrSync

promote

public Block promote(Block block)

Description copied from interface: BlockMgr

Promote to writable : it's OK to promote an already writable block

Specified by:

promote in interface BlockMgr

Overrides:

promote in class BlockMgrSync

write

public void write(Block block)

Description copied from interface: BlockMgr

Write a block back - it still needs releasing.

Specified by:

write in interface BlockMgr

Overrides:

write in class BlockMgrSync

overwrite

public void overwrite(Block block)

Description copied from interface: BlockMgr

Replace the contents of a block slot with new contents. Block does not need releasing. The write() operation may not do real work if the block is mapped - this operation really does replace the contents with the new contents.

Specified by:

overwrite in interface BlockMgr

Overrides:

overwrite in class BlockMgrSync

free

public void free(Block block)

Description copied from interface: BlockMgr

Announce a block is no longer in use (i.e it's now freed)

Specified by:

free in interface BlockMgr

Overrides:

free in class BlockMgrSync

sync

public void sync()

Description copied from interface: BlockMgr

Sync the block manager

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync

Specified by:

sync in interface BlockMgr

Overrides:

sync in class BlockMgrSync

syncForce

public void syncForce()

Description copied from interface: BlockMgr

Sync the block manager : system operation to ensure sync() is passed down

Specified by:

syncForce in interface BlockMgr

Overrides:

syncForce in class BlockMgrSync

close

public void close()

Description copied from interface: BlockMgr

Close the block manager

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

Specified by:

close in interface BlockMgr

Overrides:

close in class BlockMgrSync

toString

public String toString()

Overrides:

toString in class BlockMgrSync