Universal Messaging 10.11 | Administration Guide | Using Command Central to Manage Universal Messaging | Configuring Universal Messaging | Channels
 
Channels
The following tables show the properties you can configure when you create a channel in Command Central.
Channel Properties
Property
Description
Name
Required. Name of the channel.
Note:
After a channel is created, you cannot edit the channel name.
Type
Type of the channel. The Universal Messaging channel types are:
*Reliable
*Persistent
*Mixed (default)
TTL (ms)
Specifies how long (in milliseconds) each event is retained on the channel after being published. For example, if you specify a TTL of 10000, the events on the channel will be automatically removed by the server after 10000 milliseconds. Specify 0 for events to remain on the channel indefinitely.
Capacity
Event capacity of the channel. Specifies the maximum number of events that can be on a channel, once published. Specify 0 to store unlimited events. The maximum channel capacity is 2147483646.
Dead event store
Channel or queue to be used to store events that are purged before being consumed.
Engine
Type of engine to be used for the channel. By default, Universal Messaging retains all events on the channel for a specified TTL, modify the retention behavior by selecting JMS engine or Merge engine.
Cluster-wide
Selected automatically if the Universal Messaging server instance is part of a cluster.
Protobuf descriptor
Absolute path to the Protocol Buffer (protobuf) descriptor file that is stored on the machine where Software AG Platform Manager is installed.
Storage Properties
Property
Description
Auto-maintenance
Select to retain events till they reach their TTL. Cancel the selection to purge events from the channel storage file.
Honor capacity
Select to prevent publishing of data when the channel is full. Cancel the selection to purge the oldest published event.
Enable caching
Select for the events to be stored in the cache memory and reused. Cancel the selection to read and stored in the file store.
Cache on reload
Select to enable caching during reload.
Enable read buffering
Select to enable read buffering for the store on the Universal Messaging server.
Enable multicast
Select to enable multicast client to receive events over multitask connections.
Read buffer size
Read buffer size in bytes.
Sync each write
Select to sync each write to the file system.
Sync batch size
Configurable only when Sync each write is selected. Number of events that is to be synced with the file system at once.
Sync batch time
Configurable only when Sync each write is selected. Time in milliseconds (ms) between syncs with the file system.
Priority
Priority range. 0 (lowest) to 9 (highest).
Events per spindle
Maximum number of events allowed per file.
Stamp dictionary
Select to stamp events on the channel by the server.
Channel Keys
Column
Description
Key name
Name of the channel publish key.
Depth
Depth of the channel publish key. Depth is the maximum number of events that can exist on a channel for a specific key name.
Channel ACL
Column
Description
Subject
User name in the format user@host or the name of an existing group.
Manage ACL
Select to allow the user or group to manage ACLs.
Full
Select to grant full privileges to the user or group.
Purge
Select to allow the user or group to delete events.
Subscribe
Select to allow the user or group to subscribe to events.
Publish
Select to allow the user or group to publish events.
Named (durable)
Select to allow the user or group to connect to this channel using durable subscriptions.
Joins
You can add and delete joins, but you cannot edit channel join properties.
Column
Description
Type
Type of join. Outgoing: channel is source. Incoming: channel is destination.
Destination name
Destination channel or queue.
Target instance name
Name of the target instance. Required only if the channel or queue is in a remote Universal Messaging server instance.
Target instance URL
URL of the target Universal Messaging server instance that has the destination channel or queue for the join.
Filter
Type the filtering criteria, a string or a regular expression. Events will be routed to the destination channel based on the filtering criteria.
Hop count
Type the maximum number of subsequent joins.
Event ID
Last retrieved event ID.
Allow purge
Select to allow purging of events on the channel.
Archival
Select to enable archival join. Archival join is a join between a channel and a queue where events will not be checked for duplication.