org.apache.jena.dboe.base.block

Class BlockMgrFreeChain

java.lang.Object

org.apache.jena.dboe.base.block.BlockMgrWrapper

org.apache.jena.dboe.base.block.BlockMgrFreeChain

All Implemented Interfaces:

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

public final class BlockMgrFreeChain
extends BlockMgrWrapper

Recycle blocks - but only in-session. At the end of JVM run, the blocks are made "permanent" as no one finds them again on restart.

Constructor Summary

Constructors

Constructor and Description
BlockMgrFreeChain(BlockMgr blockMgr)

Method Summary

Modifier and Type	Method and Description
Block	allocate(int blockSize) Allocate an uninitialized block - writable - call only inside a update sequence.
void	free(Block block) Announce a block is no longer in use (i.e it's now freed)
void	resetAlloc(long boundary) Reset the allocation limit, should be a number previously obtained from allocLimit
void	sync() Sync the block manager
String	toString()
boolean	valid(int id) Is this a valid block id? (may be a free block)

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

allocLimit, beginRead, beginUpdate, close, endRead, endUpdate, getLabel, getRead, getWrapped, getWrite, isClosed, isEmpty, overwrite, promote, release, syncForce, write

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockMgrFreeChain

public BlockMgrFreeChain(BlockMgr blockMgr)

Method Detail

allocate

public Block allocate(int blockSize)

Description copied from interface: BlockMgr

Allocate an uninitialized block - writable - call only inside a update sequence. If blockSize is -1, means "default/fixed size" for this BlockMgr

Specified by:

allocate in interface BlockMgr

Overrides:

allocate in class BlockMgrWrapper

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 BlockMgrWrapper

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 BlockMgrWrapper

valid

public boolean valid(int id)

Description copied from interface: BlockMgr

Is this a valid block id? (may be a free block)

Specified by:

valid in interface BlockMgr

Overrides:

valid in class BlockMgrWrapper

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 BlockMgrWrapper

toString

public String toString()

Overrides:

toString in class BlockMgrWrapper