Package net.timewalker.ffmq4.storage.data.impl

Class BlockBasedDataStore

java.lang.Object

net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

net.timewalker.ffmq4.storage.data.impl.AbstractBlockBasedDataStore

net.timewalker.ffmq4.storage.data.impl.BlockBasedDataStore

All Implemented Interfaces:

DataStore, LinkedDataStore

public final class BlockBasedDataStore
extends AbstractBlockBasedDataStore

BlockBasedDataStore

Field Summary

Fields inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractBlockBasedDataStore

AB_ALLOCSIZE_OFFSET, AB_FLAGS_OFFSET, AB_NEXTBLOCK_OFFSET, AB_PREVBLOCK_OFFSET, allocatedSize, ALLOCATION_TABLE_SUFFIX, allocationTableFile, allocationTableRandomAccessFile, AT_BLOCK_SIZE, AT_HEADER_BLOCKCOUNT_OFFSET, AT_HEADER_FIRSTBLOCK_OFFSET, AT_HEADER_SIZE, blockCount, blockSize, DATA_FILE_SUFFIX, dataFile, dataRandomAccessFile, descriptor, firstBlock, flags, nextBlock, previousBlock

Fields inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

locks, SAFE_MODE

Constructor Summary

Constructors

Constructor	Description
BlockBasedDataStore(QueueDefinition queueDef)	Constructor

Method Summary

Modifier and Type	Method	Description
void	commitChanges()	Ensure everything's persisted (synchronous)
void	commitChanges(SynchronizationBarrier barrier)	Ensure everything's persisted (asynchronous)
protected void	extendStoreFiles(int oldBlockCount, int newBlockCount)	Extend the store files to newBlockCount
protected void	flush()	Flush internal buffers
protected void	initFilesystem()
protected void	readDataBlock(byte[] data, int offset, int len, int blockHandle)	Read a data block to disk
protected void	writeAllocationBlock(int blockIndex)	Write an allocation block to disk
protected void	writeDataBlock(byte[] data, int offset, int len, int blockHandle)	Write a data block to disk
protected void	writeFirstBlock()	Write the first block index to disk

Methods inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractBlockBasedDataStore

checkHandle, close, delete, first, getAbsoluteStoreUsage, getBlockSize, getStoreUsage, init, integrityCheck, next, previous, replace, retrieve, retrieveHeader, serializeAllocationBlock, size, store, toString

Methods inherited from class net.timewalker.ffmq4.storage.data.impl.AbstractDataStore

isLocked, lock, unlock

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockBasedDataStore

public BlockBasedDataStore(QueueDefinition queueDef)

Constructor

Method Detail

initFilesystem

protected void initFilesystem()
                       throws DataStoreException

Overrides:

initFilesystem in class AbstractBlockBasedDataStore

Throws:

DataStoreException

writeFirstBlock

protected void writeFirstBlock()
                        throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Write the first block index to disk

Specified by:

writeFirstBlock in class AbstractBlockBasedDataStore

Throws:

DataStoreException

writeAllocationBlock

protected void writeAllocationBlock(int blockIndex)
                             throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Write an allocation block to disk

Specified by:

writeAllocationBlock in class AbstractBlockBasedDataStore

Throws:

DataStoreException

writeDataBlock

protected void writeDataBlock(byte[] data,
                              int offset,
                              int len,
                              int blockHandle)
                       throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Write a data block to disk

Specified by:

writeDataBlock in class AbstractBlockBasedDataStore

Throws:

DataStoreException

readDataBlock

protected void readDataBlock(byte[] data,
                             int offset,
                             int len,
                             int blockHandle)
                      throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Read a data block to disk

Specified by:

readDataBlock in class AbstractBlockBasedDataStore

Throws:

DataStoreException

extendStoreFiles

protected void extendStoreFiles(int oldBlockCount,
                                int newBlockCount)
                         throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Extend the store files to newBlockCount

Specified by:

extendStoreFiles in class AbstractBlockBasedDataStore

Throws:

DataStoreException

commitChanges

public void commitChanges()
                   throws DataStoreException

Description copied from interface: DataStore

Ensure everything's persisted (synchronous)

Throws:

DataStoreException

commitChanges

public void commitChanges(SynchronizationBarrier barrier)
                   throws DataStoreException

Description copied from interface: DataStore

Ensure everything's persisted (asynchronous)

Throws:

DataStoreException

flush

protected void flush()
              throws DataStoreException

Description copied from class: AbstractBlockBasedDataStore

Flush internal buffers

Specified by:

flush in class AbstractBlockBasedDataStore

Throws:

DataStoreException