Creating the Counter Desks Table Monitor 

Procedure

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       1.      BankMBean:

public Serializable[][] getDesks();

 

       2.      Bank:

public Serializable[][] getDesks() {    return BankProperties.getDesks(); }

 

       3.      Modify the monitor-configuration.xml:

                            a.      Define the monitor-semantics:

<table-configuration-group name="CounterDesks"> <description ID="Counter desks">Name of the cashier, number of the desk, floor</description> <data-collection> <polled-by-monitor period="1" unit="MINUTE"/> </data-collection> <columns> <column>Name</column> <column>Desk number</column> <column>Floor</column> </columns> </table-configuration-group>

 

                            b.      Define the monitor-tree:

<table-monitor name="Counter desks" filename="Bank.CounterDesks" configuration-group="CounterDesks"> <monitored-resource name="BankMBean" type="APPLICATION"/> <table-attribute-mapping> <table-entries-attribute> <observed-resource-attribute name="Desks"/> </table-entries-attribute> </table-attribute-mapping> </table-monitor>

 

The monitoring framework expects a Serializable[][] value for the table monitors, that is why the return value of the getDesks() method is Serializable[][]. This method is declared in the BankMBean interface and it is implemented in the class Bank. In the monitor-semantics part of the monitor-configuration.xml a table-configuration-group is declared with name CounterDesks, which is used for creating the node in the monitor tree (the monitor-tree part in the XML). The ID in the Counter desks description is the name of the monitor shown in the tree. The table has 3 columns: Name, Desk number, and Floor, declared in monitor-semantics under the <columns> tag.

Result

The Counter Desks monitor appears in the monitoring tree under Applications → Bank Information → General Information.