com.bigdata.rwstore

Interface IRWStrategy

All Superinterfaces:

IAddressManager, IAllocationManager, IAllocationManagerStore, IBufferStrategy, ICounterSetAccess, IHistoryManager, IMRMW, IMROW, IRawStore, IStreamStore

All Known Implementing Classes:

MemStrategy, RWStrategy

public interface IRWStrategy
extends IBufferStrategy, IAllocationManager, IAllocationManagerStore, IHistoryManager

Defines a marker interface to be used to indicate strategies that share RW semantics such as RWStrategy and MemStrategy

Author:

Martyn Cutcher

Field Summary

Fields inherited from interface com.bigdata.rawstore.IAddressManager

NULL

Method Summary

Methods

Modifier and Type	Method and Description
Lock	getCommitLock() Optionally return a Lock that must be used (when non- null) to make the IBufferStrategy.commit() / postCommit() strategy atomic.
IStore	getStore() Return the backing IStore.
boolean	isCommitted(long addr) Return true iff the allocation having that address is flagged as committed.
void	postCommit() Called post commit to dispose any transient commit state retained to support reset/rollback.

Methods inherited from interface com.bigdata.journal.IBufferStrategy

abort, closeForWrites, commit, getAddressManager, getBufferMode, getCounters, getExtent, getHeaderSize, getInitialExtent, getMaximumExtent, getMaxRecordSize, getMetaBitsAddr, getMetaStartAddr, getNextOffset, getOffsetBits, getUserExtent, isDirty, readRootBlock, requiresCommit, transferTo, truncate, useChecksums, writeRootBlock

Methods inherited from interface com.bigdata.rawstore.IRawStore

close, delete, deleteResources, destroy, force, getFile, getResourceMetadata, getUUID, isFullyBuffered, isOpen, isReadOnly, isStable, read, size, write

Methods inherited from interface com.bigdata.rawstore.IAddressManager

getByteCount, getOffset, getPhysicalAddress, toAddr, toString

Methods inherited from interface com.bigdata.rawstore.IStreamStore

getInputStream, getOutputStream

Methods inherited from interface com.bigdata.rwstore.IAllocationManager

abortContext, detachContext, newAllocationContext

Methods inherited from interface com.bigdata.rawstore.IAllocationManagerStore

delete, getOutputStream, write

Methods inherited from interface com.bigdata.rwstore.IHistoryManager

checkDeferredFrees, getLastReleaseTime, newTx, registerExternalCache, saveDeferrals

Method Detail

getStore

IStore getStore()

Return the backing IStore.

isCommitted

boolean isCommitted(long addr)

Return true iff the allocation having that address is flagged as committed. The caller must be holding the allocation lock in order for the result to remain valid outside of the method call.

Parameters:

addr - The address.

Returns:

true iff the address is currently committed.

getCommitLock

Lock getCommitLock()

Optionally return a Lock that must be used (when non- null) to make the IBufferStrategy.commit() / postCommit() strategy atomic.

postCommit

void postCommit()

Called post commit to dispose any transient commit state retained to support reset/rollback.

Note: It is the responsibility of the commit protocol layers to wind up calling IBufferStrategy.abort() if there is a failure during the commit protocol.