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The Monitor panel comprises 2 sections. The top most
section contains a real time graph illustrating the
realm memory usage in the same way the Realm
Status panel displays memory usage. This section
also contains a summary showing the number of mounted
realms, the number of channels, the number of queues
and the number of services.
The image below demonstrates the Monitor panel for
a container within a clustered realm.
Channel Usage
The next section of the Monitor panel displays a table
showing multiple columns and rows. This table represents
channel usage throughout the realm. Each row in the
table represents a channel. Channel usage can be measured
a number of ways. Each measurement corresponds to a
column within the table. By clicking on one of the column
headers, all known channels found within the container
will be sorted according to their value for the selected
column. For example, one of the columns is 'Connections',
i.e. the number of current consumers on the channel.
By clicking on the column header labelled 'Connections',
the table will be sorted according to the number of
consumers each channel has. The channel with the most
number of consumers will appear at the top of the table.
Each column used for channel usage measurements is
described below:
Connections - The number of consumers
the channel has
Published - The rate of events published
per status interval
Consumed - The rate of events consumed per
status interval
Memory (bytes) - The number of bytes the
channel uses from the JVM memory
% Memory - The percentage of overall JVM
memory used by this channel
Disk - The amount of disk space used by this
channel, only relevant for persistent / mixed channels
Monitor Graphs
The monitor panel provides a method of graphing channel
usage. It uses a 3D graph package from sourceforge
to display the items in each table as columns in a 3D
vertical bar chart. The bar charts can be update live
as the values in the tables are updated. Once a column
is selected, simply click on the button labelled 'Bar
Graph' under either the channel or connections table
and a graph panel will appear, as shown in the image
below showing a graph of the number of events published
for channels within the container..
Right-clicking anywhere within the graph will show
a pop-up menu of options. One of the options is labelled
'Start Live Update', which will ensure the graph consumes
updates as and when they occur to the table. Once the
live update is started, you can also stop the live update
by once again right clicking on the graph and selecting
'Stop Live Update'.
You can also print the graph, and save the graph image
as a '.png' file, as well as alter the properties of
the graph and its axis. |
