Monitoring Java Message Service Grid

Note - Enterprise Manager provides a unified management environment for JMS IQ Manager, Java System Message Queue, and Java Message Service Grid (JMS Grid). However, the level of monitoring and management capabilities supported vary for the different message servers.

If the Project node in the left panel represents an application that uses JMS Grid destinations, then the Project node contains a subnode for each destination (for example, Queue1 and Queue2).

Monitoring Queues

You can use many of Enterprise Manager’s queue management options on the queues utilized by an application deployed in a server. This section describes these options and their level of support.

The top right panel displays information about the selected queue.

Table 3 Queue Tab - Columns

Column Name	Description
Queue Name	The name of the queue.
Min Sequence Number	JMS Grid does not use sequence numbers, so this column always displays the value zero (0).
Max Sequence Number	JMS Grid does not use sequence numbers, so this column always displays the value zero (0).
Available Count	The number of unprocessed messages in the queue.
Number of Receivers	The number of receivers for this queue.
Last Published Date/Time	The date and timestamp of the most recent message currently available in the queue. If no messages are available, this column shows the last publication date and time of the last message.

You can list the messages in a queue in the bottom right panel. The following table describes the columns in the Messages tab.

Table 4 Message Tab Columns

Property Name	Description
Sequence Number	The values in this column are hash values generated from the message ID and do not have meaning for JMS Grid.
Message ID	The unique identification number for the message.
Status	Indicates whether the message is unread.
Message Size	The size of the message including the JMS header (in bytes).
Delivery Mode	Indicates whether the message is persistent or nonpersistent.
Priority	The priority of the message from 0 to 9, with 9 as the highest priority.
Sent On	The day, date, and time when the message was received.

The bottom right panel includes the following buttons:

The Send a Message button enables you to publish a new message. The message can only be of type text. You can specify the time to live, priority, and delivery mode.
The View/Edit button enables you to view message content. However, you cannot edit message content in this release.
The Properties button enables you to view message properties. However, some properties might not be available in this release.
The Select All button enables you to select all of the messages. The Select None button enables you to deselect all of the messages.
The Delete button enables you to delete the selected messages.
The Show Journaled button is not used for JMS Grid.

The paging feature is not supported in this release. However, if you refresh the view, the list changes as messages are consumed and new messages are received.

Monitoring Topics

Enterprise Manager allows you to see an application’s topics in the left panel in a similar way to that illustrated for queues. The top right panel displays information about the selected topic.

Table 5 Topics Tab - Columns

Column Name	Description
Topic Name	The name of the topic.
Min Sequence Number	JMS Grid does not use sequence numbers, so this column always displays the value zero (0).
Max Sequence Number	JMS Grid does not use sequence numbers, so this column always displays the value zero (0).
Available Count	The number of unprocessed messages in this topic. This value represents the number of messages which have not been consumed by any subscriber to the topic.
Current Subscribers	The number of subscribers who are actively consuming from the topic.
Last Published Date/Time	The date and timestamp of the most recent message currently available in the topic. If no messages are available, this column shows the last publication date and time of the last message.

You can list the messages in a topic in the bottom right panel just as for queues. The column meanings for topics are the same as for queues. The messages might not be displayed in the order in which they were sent, as shown in the Sent On column.

This panel also has several buttons, whose functions are the same as for topics.

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