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BEA Systems, Inc. | ||||||||||
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This class represents a disk-based JMS file store that stores persistent messages and durable subscribers in a file-system directory.
Field Summary | |
static long |
CACHING_STUB_SVUID
|
Fields inherited from class weblogic.management.configuration.JMSStoreMBean |
CACHING_STUB_SVUID |
Fields inherited from class weblogic.management.configuration.ConfigurationMBean |
CACHING_STUB_SVUID,
DEFAULT_EMPTY_BYTE_ARRAY |
Method Summary | |
java.lang.String |
getDirectory()
Defines the pathname to the valid file-system directory where the JMS file store is kept. |
java.lang.String |
getSynchronousWritePolicy()
A user-defined policy that determines how the JMS file store writes data to disk. |
void |
setDirectory(java.lang.String directory)
Defines the pathname to the valid file-system directory where the JMS file store is kept. |
void |
setSynchronousWritePolicy(java.lang.String policy)
A user-defined policy that determines how the JMS file store writes data to disk. |
Methods inherited from interface weblogic.management.configuration.JMSStoreMBean |
getJMSServer |
Methods inherited from interface weblogic.management.configuration.ConfigurationMBean |
freezeCurrentValue,
getNotes,
restoreDefaultValue,
setComments,
setDefaultedMBean,
setNotes,
setPersistenceEnabled |
Methods inherited from interface weblogic.management.WebLogicMBean |
getMBeanInfo,
getName,
getObjectName,
getParent,
getType,
isCachingDisabled,
isRegistered,
setName,
setParent |
Methods inherited from interface javax.management.DynamicMBean |
getAttribute,
getAttributes,
invoke,
setAttribute,
setAttributes |
Methods inherited from interface javax.management.MBeanRegistration |
postDeregister,
postRegister,
preRegister |
Methods inherited from interface javax.management.NotificationBroadcaster |
addNotificationListener,
getNotificationInfo,
removeNotificationListener |
Field Detail |
public static final long CACHING_STUB_SVUID
Method Detail |
public java.lang.String getDirectory()
This attribute is not dynamically configurable.
public void setDirectory(java.lang.String directory) throws javax.management.InvalidAttributeValueException
This attribute is not dynamically configurable.
directory
- The new directory valuepublic java.lang.String getSynchronousWritePolicy()
Disabled - Transactions are complete as soon as their writes are cached in memory, instead of waiting for the writes to successfully reach the disk. This policy is the fastest, but the least reliable (that is, transactionally safe). It can be more than 100 times faster than the other policies, but power outages or operating system failures can cause lost and/or duplicate messages.
Cache-Flush - Transactions cannot complete until all of their writes have been flushed down to disk. This policy is reliable and scales well as the number of simultaneous users increases.
Direct-Write - File store writes are written directly to disk. This policy
is supported on Solaris, HP-UX, and Windows. If this policy is set on an unsupported platform, the
file store automatically uses the Cache-Flush policy instead.
The Direct-Write policy’s reliability and performance depend on the platform’s use of
on-disk caches with respect to direct writes. For example, UNIX systems do not use on-disk
caches for direct writes, while Windows systems generally do. The following points illustrate
the pros and cons of using on-disk caching (when possible) with this policy:
Warning! Although the use of the Direct-Write policy is transactionally reliable on Solaris and HP systems, Windows systems may leave transaction data in the on-disk cache without writing it to disk immediately. This is not considered to be transactionally reliable, since a power failure can cause loss of on-disk cache data-- possibly resulting in lost and/or duplicate messages. For reliable writes using Direct-Write on Windows, either disable all write caching for the disk (enabled by default), or use a disk with a battery-backed cache. Some file systems, however, do not allow this value to be changed (for example, a RAID system that has a reliable cache).
To disable the on-disk cache for a disk drive on Windows 2000:
Note: If the JMS file store is used exclusively for paging non-persistent messages to disk, the Synchronous Write Policy is ignored.
public void setSynchronousWritePolicy(java.lang.String policy) throws javax.management.InvalidAttributeValueException, DistributedManagementException
Disabled - Transactions are complete as soon as their writes are cached in memory, instead of waiting for the writes to successfully reach the disk. This policy is the fastest, but the least reliable (that is, transactionally safe). It can be more than 100 times faster than the other policies, but power outages or operating system failures can cause lost and/or duplicate messages.
Cache-Flush - Transactions cannot complete until all of their writes have been flushed down to disk. This policy is reliable and scales well as the number of simultaneous users increases.
Direct-Write - File store writes are written directly to disk. This policy
is supported on Solaris, HP-UX, and Windows. If this policy is set on an unsupported platform, the
file store automatically uses the Cache-Flush policy instead.
The Direct-Write policy’s reliability and performance depend on the platform’s use of
on-disk caches with respect to direct writes. For example, UNIX systems do not use on-disk
caches for direct writes, while Windows systems generally do. The following points illustrate
the pros and cons of using on-disk caching (when possible) with this policy:
Warning! Although the use of the Direct-Write policy is transactionally reliable on Solaris and HP systems, Windows systems may leave transaction data in the on-disk cache without writing it to disk immediately. This is not considered to be transactionally reliable, since a power failure can cause loss of on-disk cache data-- possibly resulting in lost and/or duplicate messages. For reliable writes using Direct-Write on Windows, either disable all write caching for the disk (enabled by default), or use a disk with a battery-backed cache. Some file systems, however, do not allow this value to be changed (for example, a RAID system that has a reliable cache).
To disable the on-disk cache for a disk drive on Windows 2000:
Note: If the JMS file store is used exclusively for paging non-persistent messages to disk, the Synchronous Write Policy is ignored.
policy
- The new synchronousWritePolicy value
|
Documentation is available at http://download.oracle.com/docs/cd/E13222_01/wls/docs81 |
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