com.arjuna.ats.arjuna.common
Class ObjectStoreEnvironmentBean

java.lang.Object
  com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean

All Implemented Interfaces:

ObjectStoreEnvironmentBeanMBean

public class ObjectStoreEnvironmentBean
extends Object
implements ObjectStoreEnvironmentBeanMBean

A JavaBean containing configuration properties for the objectstore and various implementations thereof.

Author:

Jonathan Halliday (jonathan.halliday@redhat.com)

Constructor Summary

ObjectStoreEnvironmentBean()

Method Summary

int	getCacheStoreHash() Returns the number of hash buckets used for the cache work queue.
int	getCacheStoreRemovedItems() Returns the maximum number of removed items that may be held in the cache before being purged.
int	getCacheStoreScanPeriod() Returns the interval on which the cache will wake and process outstanding work.
int	getCacheStoreSize() Returns the maximum allowed size, in bytes, of the cache store's in-memory cache.
int	getCacheStoreWorkItems() Returns the maximum number of outstanding writes that may be held in the cache.
int	getHashedDirectories() Returns the number of directories over which the ObjectStore contents will be distributed.
int	getHierarchyRetry() Returns the maximum number of attempts which may be made to create a file path in the store.
int	getHierarchyTimeout() Returns the time in milliseconds to wait between file creation retries.
String	getLocalOSRoot() Returns the local ObjectStore root directory name.
String	getObjectStoreDir() Returns the ObjectStore directory path.
String	getObjectStoreType() Returns the fully qualified class name for the ObjectStore implementation.
long	getPurgeTime() Returns the purge interval for the LogStore, in milliseconds.
int	getShare() Returns the share mode for the ObjectStore, i.e., is this being shared between VMs? Default: ObjectStore.OS_UNKNOWN Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.share
long	getTxLogSize() Returns the default size of the LogStore file, in bytes.
boolean	isCacheStoreSync() Returns true if writes to the objectstore should include a disk sync.
boolean	isObjectStoreSync() Returns true if ObjectStore operations should be synched to disk.
boolean	isScanZeroLengthFiles() Returns true if zero length files should be returned by a recovery scan.
boolean	isSynchronousRemoval() Returns true if the LogStore should write removal records synchronously.
boolean	isTransactionSync() Returns true if transaction log operations should be synched to disk.
void	setCacheStoreHash(int cacheStoreHash) Sets the number of hash buskets used to store the cache work queue.
void	setCacheStoreRemovedItems(int cacheStoreRemovedItems) Sets the maximum number of removed items that may be held in the cache before being purged.
void	setCacheStoreScanPeriod(int cacheStoreScanPeriod) Sets the interval on which the cache will process outstanding work, in milliseconds.
void	setCacheStoreSize(int cacheStoreSize) Sets the maximum size, in bytes, of the in-memory object state cache.
void	setCacheStoreSync(boolean cacheStoreSync) Sets if writes to the store should be synched to disk or not.
void	setCacheStoreWorkItems(int cacheStoreWorkItems) Sets the maximum number of outstanding writes that may be held in the cache.
void	setHashedDirectories(int hashedDirectories) Sets the number of directories over which the ObjectStore will be split.
void	setHierarchyRetry(int hierarchyRetry) Sets the maximum number of attempts which may be made to create a direcory tree in the store.
void	setHierarchyTimeout(int hierarchyTimeout) Sets the time in milliseconds to wait between file creation retries.
void	setLocalOSRoot(String localOSRoot) Sets the local ObjectStore root directory name.
void	setObjectStoreDir(String objectStoreDir) Sets the ObjectStore directory path.
void	setObjectStoreSync(boolean objectStoreSync) Sets if ObjectStore operations should be synched to disk or not.
void	setObjectStoreType(String objectStoreType) Sets the symbolic name of the ObjectStore implementation.
void	setPurgeTime(long purgeTime) Sets the purge interval for the LogStore, in milliseconds.
void	setScanZeroLengthFiles(boolean scanZeroLengthFiles) Sets if zero length files should be returned by a recovery scan.
void	setShare(int share) Sets the share mode of the ObjectStore
void	setSynchronousRemoval(boolean synchronousRemoval) Sets if the LogStore should write removal records synchronously or not.
void	setTransactionSync(boolean transactionSync) Sets if transaction log operations should be synched to disk or not.
void	setTxLogSize(long txLogSize) Sets the default size of the LogStore, in bytes.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectStoreEnvironmentBean

public ObjectStoreEnvironmentBean()

Method Detail

getCacheStoreSize

public int getCacheStoreSize()

Returns the maximum allowed size, in bytes, of the cache store's in-memory cache. Default: 10240 bytes Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.size

Specified by:

getCacheStoreSize in interface ObjectStoreEnvironmentBeanMBean

Returns:

the memory cache size in bytes.

setCacheStoreSize

public void setCacheStoreSize(int cacheStoreSize)

Sets the maximum size, in bytes, of the in-memory object state cache.

Parameters:

cacheStoreSize - the maximum cache size in bytes.

isCacheStoreSync

public boolean isCacheStoreSync()

Returns true if writes to the objectstore should include a disk sync. Unlikely to be worthwile since the store caches state in memory anyhow. Default: false Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.sync

Specified by:

isCacheStoreSync in interface ObjectStoreEnvironmentBeanMBean

Returns:

true if writes should be synched to disk, false otherwise.

setCacheStoreSync

public void setCacheStoreSync(boolean cacheStoreSync)

Sets if writes to the store should be synched to disk or not.

Parameters:

cacheStoreSync - true to enable syncing, false to disable.

getCacheStoreRemovedItems

public int getCacheStoreRemovedItems()

Returns the maximum number of removed items that may be held in the cache before being purged. Default: 256 Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.removedItems

Specified by:

getCacheStoreRemovedItems in interface ObjectStoreEnvironmentBeanMBean

Returns:

the maximum number of removed items in the cache.

setCacheStoreRemovedItems

public void setCacheStoreRemovedItems(int cacheStoreRemovedItems)

Sets the maximum number of removed items that may be held in the cache before being purged.

Parameters:

cacheStoreRemovedItems - teh maximun number of items.

getCacheStoreScanPeriod

public int getCacheStoreScanPeriod()

Returns the interval on which the cache will wake and process outstanding work. Default: 120000 milliseconds Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.scanPeriod

Specified by:

getCacheStoreScanPeriod in interface ObjectStoreEnvironmentBeanMBean

Returns:

the work interval of the cache, in milliseconds.

setCacheStoreScanPeriod

public void setCacheStoreScanPeriod(int cacheStoreScanPeriod)

Sets the interval on which the cache will process outstanding work, in milliseconds.

Parameters:

cacheStoreScanPeriod - the sleep duration, in milliseconds.

getCacheStoreWorkItems

public int getCacheStoreWorkItems()

Returns the maximum number of outstanding writes that may be held in the cache. Default: 100 Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.workItems

Specified by:

getCacheStoreWorkItems in interface ObjectStoreEnvironmentBeanMBean

Returns:

the maximum number of outstanding writes in the cache.

setCacheStoreWorkItems

public void setCacheStoreWorkItems(int cacheStoreWorkItems)

Sets the maximum number of outstanding writes that may be held in the cache.

Parameters:

cacheStoreWorkItems - the maximum number of outstnading writes.

getCacheStoreHash

public int getCacheStoreHash()

Returns the number of hash buckets used for the cache work queue. Default: 128 Equivalent deprecated property: com.arjuna.ats.internal.arjuna.objectstore.cacheStore.hash

Specified by:

getCacheStoreHash in interface ObjectStoreEnvironmentBeanMBean

Returns:

the number of hash buckets used to store the cache state.

setCacheStoreHash

public void setCacheStoreHash(int cacheStoreHash)

Sets the number of hash buskets used to store the cache work queue.

Parameters:

cacheStoreHash - the number of hash buckets.

getLocalOSRoot

public String getLocalOSRoot()

Returns the local ObjectStore root directory name. This should be a path element, not a complete path. Default: "defaultStore" Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.localOSRoot

Specified by:

getLocalOSRoot in interface ObjectStoreEnvironmentBeanMBean

Returns:

the local ObjectStore root directory name.

setLocalOSRoot

public void setLocalOSRoot(String localOSRoot)

Sets the local ObjectStore root directory name. This shold be a path element, not a complete path.

Parameters:

localOSRoot - the directory name.

getObjectStoreDir

public String getObjectStoreDir()

Returns the ObjectStore directory path. Default: {user.dir}/ObjectStore Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.objectStoreDir

Specified by:

getObjectStoreDir in interface ObjectStoreEnvironmentBeanMBean

Returns:

the ObjectStore directory path.

setObjectStoreDir

public void setObjectStoreDir(String objectStoreDir)

Sets the ObjectStore directory path.

Parameters:

objectStoreDir - the directory path.

isObjectStoreSync

public boolean isObjectStoreSync()

Returns true if ObjectStore operations should be synched to disk. Note that this value may be overridden by store implementation specific configuration. See also: isTransactionSync Default: true Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.objectStoreSync

Specified by:

isObjectStoreSync in interface ObjectStoreEnvironmentBeanMBean

Returns:

true for synched operations, false otherwise.

setObjectStoreSync

public void setObjectStoreSync(boolean objectStoreSync)

Sets if ObjectStore operations should be synched to disk or not. Caution: Disabling this may be lead to non-ACID transaction behaviour.

Parameters:

objectStoreSync - true to sunc to disk, false to skip synching.

getObjectStoreType

public String getObjectStoreType()

Returns the fully qualified class name for the ObjectStore implementation. Default: "com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore" Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.objectStoreType

Specified by:

getObjectStoreType in interface ObjectStoreEnvironmentBeanMBean

Returns:

the fully qualified class name of the ObjectStore implementation.

setObjectStoreType

public void setObjectStoreType(String objectStoreType)

Sets the symbolic name of the ObjectStore implementation.

Parameters:

objectStoreType - the symbolic name of the implementation.

getHashedDirectories

public int getHashedDirectories()

Returns the number of directories over which the ObjectStore contents will be distributed. Splitting the contents is important for performance on some file systems, as it reduces chain length (number of items in a directory) and directory lock contention. Default: 255 Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.hashedDirectories

Specified by:

getHashedDirectories in interface ObjectStoreEnvironmentBeanMBean

Returns:

the number of directories over which to distribute the store.

setHashedDirectories

public void setHashedDirectories(int hashedDirectories)

Sets the number of directories over which the ObjectStore will be split.

Parameters:

hashedDirectories - the number of directories.

isTransactionSync

public boolean isTransactionSync()

Returns true if transaction log operations should be synched to disk. Default: true Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.transactionSync

Specified by:

isTransactionSync in interface ObjectStoreEnvironmentBeanMBean

Returns:

true if operations should be forcedto disk, false otherwise.

setTransactionSync

public void setTransactionSync(boolean transactionSync)

Sets if transaction log operations should be synched to disk or not. Caution: Disabling this may be lead to non-ACID transaction behaviour.

Parameters:

transactionSync - true to enable synching, false to disable.

isScanZeroLengthFiles

public boolean isScanZeroLengthFiles()

Returns true if zero length files should be returned by a recovery scan. Default: false

Returns:

true if scan results should include zero length files, false if they should be excluded.

setScanZeroLengthFiles

public void setScanZeroLengthFiles(boolean scanZeroLengthFiles)

Sets if zero length files should be returned by a recovery scan.

Parameters:

scanZeroLengthFiles - true to include zero length files in scan results, false to exclude them.

getShare

public int getShare()

Returns the share mode for the ObjectStore, i.e., is this being shared between VMs? Default: ObjectStore.OS_UNKNOWN Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.share

Specified by:

getShare in interface ObjectStoreEnvironmentBeanMBean

Returns:

the default share mode.

setShare

public void setShare(int share)

Sets the share mode of the ObjectStore

Parameters:

share - a valid share mode.

getHierarchyRetry

public int getHierarchyRetry()

Returns the maximum number of attempts which may be made to create a file path in the store. Default: 100 Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.hierarchyRetry

Specified by:

getHierarchyRetry in interface ObjectStoreEnvironmentBeanMBean

Returns:

the maximum number of attempts to create a nested directory tree.

setHierarchyRetry

public void setHierarchyRetry(int hierarchyRetry)

Sets the maximum number of attempts which may be made to create a direcory tree in the store.

Parameters:

hierarchyRetry - the maximum number of file creation attempts.

getHierarchyTimeout

public int getHierarchyTimeout()

Returns the time in milliseconds to wait between file creation retries. Default: 100 milliseconds. Equivalent deprecated property: com.arjuna.ats.arjuna.objectstore.hierarchyTimeout

Specified by:

getHierarchyTimeout in interface ObjectStoreEnvironmentBeanMBean

Returns:

the time to wait before retrying a failed file creation, in milliseconds.

setHierarchyTimeout

public void setHierarchyTimeout(int hierarchyTimeout)

Sets the time in milliseconds to wait between file creation retries.

Parameters:

hierarchyTimeout - the wait time in milliseconds.

isSynchronousRemoval

public boolean isSynchronousRemoval()

Returns true if the LogStore should write removal records synchronously. Disabling this may increase performance at the cost of recovery complexity. Default: true Equivalent deprecated property: com.arjuna.ats.arjuna.coordinator.transactionLog.synchronousRemoval

Specified by:

isSynchronousRemoval in interface ObjectStoreEnvironmentBeanMBean

Returns:

true for synchronous removals, false for buffered (asynchronous) operation.

setSynchronousRemoval

public void setSynchronousRemoval(boolean synchronousRemoval)

Sets if the LogStore should write removal records synchronously or not.

Parameters:

synchronousRemoval - true for synchronous operation, false for asynchronous.

getTxLogSize

public long getTxLogSize()

Returns the default size of the LogStore file, in bytes. Default: 10MB Equivalent deprecated property: com.arjuna.ats.arjuna.coordinator.transactionLog.txLogSize

Specified by:

getTxLogSize in interface ObjectStoreEnvironmentBeanMBean

Returns:

the default file size for the LogStore, in bytes.

setTxLogSize

public void setTxLogSize(long txLogSize)

Sets the default size of the LogStore, in bytes.

Parameters:

txLogSize - the default file size, in bytes.

getPurgeTime

public long getPurgeTime()

Returns the purge interval for the LogStore, in milliseconds. Default: 100000 milliseconds Equivalent deprecated property: com.arjuna.ats.arjuna.coordinator.transactionLog.purgeTime

Specified by:

getPurgeTime in interface ObjectStoreEnvironmentBeanMBean

Returns:

the purge interval in milliseconds.

setPurgeTime

public void setPurgeTime(long purgeTime)

Sets the purge interval for the LogStore, in milliseconds.

Parameters:

purgeTime - the purge interval in milliseconds.