Topic space [Settings]
A topic space is a location for publish/subscribe messaging.
To view this page in the console, click the following path:
Service integration -> Buses -> bus_name -> [Destination resources] Destinations -> topic_space_name.
Configuration tab
The Configuration tab shows configuration properties for this object. These property values are preserved even if the runtime environment is stopped then restarted.
General Properties
Identifier
The identifier by which this destination is known for administrative purposes.
Information Value Required No Data type String
UUID
The universal unique identifier assigned by the system to this destination for administrative purposes.
Information Value Required No Data type String
Type
Whether this bus destination is for a queue, topic space, or some other type of destination.
A topic space for publish/subscribe messaging.
Information Value Required No Data type String
Description
An optional description for the bus destination, for administrative purposes.
Information Value Required No Data type Text area
Mediation
The name of the mediation that mediates this destination.
Information Value Required No Data type String
Enable producers to override default reliability
Select this option to enable producers to override the default reliability that is set on the destination.
Information Value Required No Data type Boolean
Default reliability
The reliability assigned to a message produced to this destination when an explicit reliability has not been set by the producer.
Information Value Required No Data type drop-down list Range
- Best effort nonpersistent
- Messages are discarded when a messaging engine stops or fails. Messages might also be discarded if a connection used to send them becomes unavailable or as a result of constrained system resources.
- Express nonpersistent
- Messages are discarded when a messaging engine stops or fails. Messages might also be discarded if a connection used to send them becomes unavailable.
- Reliable nonpersistent
- Messages are discarded when a messaging engine stops or fails.
- Reliable persistent
- Messages might be discarded when a messaging engine fails.
- Assured persistent
- Messages are not discarded.
Maximum reliability
The maximum reliability of messages accepted by this destination.
Information Value Required No Data type drop-down list Range
- Best effort nonpersistent
- Messages are discarded when a messaging engine stops or fails. Messages might also be discarded if a connection used to send them becomes unavailable or as a result of constrained system resources.
- Express nonpersistent
- Messages are discarded when a messaging engine stops or fails. Messages might also be discarded if a connection used to send them becomes unavailable.
- Reliable nonpersistent
- Messages are discarded when a messaging engine stops or fails.
- Reliable persistent
- Messages might be discarded when a messaging engine fails.
- Assured persistent
- Messages are not discarded.
Default priority
The default priority assigned to messages sent to this destination when a priority has not been set by the producer.
Information Value Required No Data type Integer Range 0 through 9
Exception destination
Use these properties to define what happens to any messages that cannot be delivered to this destination.
None
The bus destination does not use an exception destination and undeliverable messages are not rerouted to an exception destination.
Attempts to redeliver the message continue, up to the maximum failed deliveries limit set for the bus destination. Then, attempts to redeliver the message continue with a time interval between retry attempts. This interval is either the Default blocked destination retry interval of the messaging engine associated with this destination, or the Blocked retry timeout set for this destination. The Default blocked destination retry interval value can be used by all queue and topic destinations associated with this messaging engine. To set a time interval specifically for this destination, select Override messaging engine blocked retry timeout default, then enter a blocked retry timeout value for this destination.
Information Value Required No Data type Radio button Default Not selected
Override messaging engine blocked retry timeout default
Override the blocked queue retry interval configured on the messaging engine owning the destination.
Select this property to set the blocked retry timeout for this destination. This property is available only when None is selected for the exception destination.
Information Value Required Yes, if None is selected. Data type Boolean Default Unchecked. The Default blocked destination retry interval value of the associated messaging engine is used.
Blocked retry timeout in milliseconds
When no exception destination is configured, the time interval to apply between retry attempts, after the maximum failed deliveries limit is reached, for this destination.
This property is available only when Override messaging engine blocked retry timeout default is selected in the exception destination properties.
Information Value Required Yes, if Override messaging engine blocked retry timeout default is checked. Data type Integer
System
The bus destination uses the system default exception destination.
Undeliverable messages are routed to the system default exception destination of the messaging engine that detects the problem: _SYSTEM.Exception.Destination.messaging_engine_name.
Information Value Required No Data type Radio button Default Selected
Specify
Select this property to configure a specific exception destination.
The exception destination must be a queue, on the same bus or a foreign bus, and must exist when the exception destination processing is configured.
Information Value Required No Data type Radio button Default Not selected
Maximum failed deliveries per message
The maximum number of failed attempts to process a message. After this number of failed attempts, if an exception destination is configured, the message is forwarded from the intended destination to its exception destination. If an exception destination is not configured, a time interval between retry attempts is applied.
This interval is either the Default blocked destination retry interval of the messaging engine associated with this destination, or the Blocked retry timeout set for this destination.
Information Value Required Yes, if an exception destination has been configured. Data type Integer Default 5 Range 0 through 2147483647
Keep count of failed deliveries per message
This option is to keep count of failed deliveries per message into the message store.
Select this option to persist the failed delivery counts of JMS messages in the message store. This option retains the count of failed deliveries even after the messaging engine is restarted.
Information Value Required No Data type Boolean Default Not selected When the option is not selected, the history of the failed delivery counts for the messages will be lost if the messaging engine is restarted.
Important: Although the property is selected, the property will not be effective until the database tables are upgraded using the sibDBUpgrade command for WebSphere Application Server v9.0 and later.
Send allowed
Clear this option (setting it to false) to stop producers from being able to send messages to this destination.
Information Value Required No Data type Boolean
Receive allowed
Clear this option (setting it to false) to prevent consumers from being able to receive messages from this destination.
Information Value Required No Data type Boolean
Maintain strict message order
Enable this option will maintain the strict ordering of messages for this destination.
Information Value Required No Data type Custom If the strict message ordering is enabled on an existing topic destination, any existing durable subscriptions along with the messages associated become invalid. When the strict message ordering is enabled and the environment is restarted, the existing durable subscriptions are deleted and re-created; the messages associated with the durable subscriptions are also deleted.
Reply destination
The name of a destination to be appended to any non-empty reverse routing path of messages sent to this destination.
Information Value Required No Data type String
Reply destination bus
The bus on which the reply destination exists.
Information Value Required No Data type String
Allow auditing of Topic access checks
This option is only available if bus and cell level auditing are enabled. Check to enable auditing of Topic access checks.
Information Value Required No Data type Boolean
Topic access check required
Whether or not authorization checks are required for access to topics.
When security is on, authorization checks are always performed at the topic space level. To add additional control, we can select this property to enable authorization checks at the topic level.
Information Value Required No Data type Boolean
Message points
- Publication points
- A publication point is created on each messaging engine in the bus when a publish/subscribe destination is created. The publication point on a messaging engine is used to hold messages published by applications connected to that messaging engine until they are delivered to subscribers.
- Mediation points
- The mediation points for the topic space. The locations in the messaging engine at which messages on the topic space are mediated.
Additional Properties
- Context properties
- Context information passed to the mediation.
Related Items
- Application resources topology
- A expandable tree view of all applications and messaging resources that reference the current destination.
- Audit Service
- Configure the global audit settings
Auditing the service integration security infrastructure Create a topic space for publish/subscribe messaging Configure bus destination properties