JDBCStoredProcedureMonitor

The JDBCStoredProcedureMonitor checks the result of a stored procedure in a remote database. The result of the stored procedure has to be a boolean value (representing true or false). The service associated with this monitor is marked as up if the stored procedure returns true and marked as down in all other cases. It is based on the JDBC technology to connect and communicate with the database.

Monitor facts

Class Name

org.opennms.netmgt.poller.monitors.JDBCStoredProcedureMonitor

Configuration and use

Table 1. Monitor-specific parameters for the JDBCStoredProcedureMonitor
Parameter	Description	Default
Required
driver	JDBC driver class to use.	org.postgresql.Driver
url `{}`	JDBC URL to connect to.	jdbc:postgresql://:OPENNMS_JDBC_HOSTNAME/opennms
user `{}`	Database user	postgres
password `{}`	Database password	empty string
stored-procedure	Name of the database stored procedure to call.	n/a
Optional
retries	How many retries to perform before failing the test.	0
schema	Name of the database schema where the stored procedure is.	test

{} indicates the parameter supports placeholder substitution.

The OPENNMS_JDBC_HOSTNAME is replaced in the url parameter with the IP or resolved hostname of the interface the monitored service is assigned to.

This monitor implements the Common Configuration Parameters.

Provide the database driver

The JDBCStoredProcedureMonitor is based on JDBC and requires a JDBC driver to communicate with any database. Since Horizon itself uses a PostgreSQL database, the PostgreSQL JDBC driver is available out of the box. For all other database systems, you must provide a compatible JDBC driver to Horizon as a JAR file. To provide a JDBC driver, place the driver-jar in your $OPENNMS_HOME/lib folder.

Examples

The following example checks a stored procedure added to the PostgreSQL database Horizon uses. The stored procedure returns true as long as less than 250,000 events are in the Horizon events table.

Note that you must include the monitor section in your definition.

Stored procedure used in the monitor

CREATE OR REPLACE FUNCTION eventlimit_sp() RETURNS boolean AS
$BODY$DECLARE
num_events integer;
BEGIN
	SELECT COUNT(*) into num_events from events;
	RETURN num_events > 250000;
END;$BODY$
LANGUAGE plpgsql VOLATILE NOT LEAKPROOF
COST 100;

<service name="OpenNMS-DB-SP-Event-Limit" interval="300000" user-defined="true" status="on">
  <parameter key="driver" value="org.postgresql.Driver"/>
  <parameter key="url" value="jdbc:postgresql://OPENNMS_JDBC_HOSTNAME:5432/opennms"/>
  <parameter key="user" value="opennms"/>
  <parameter key="password" value="opennms"/>
  <parameter key="stored-procedure" value="eventlimit_sp"/>
  <parameter key="schema" value="public"/>
</service>

<monitor service="OpenNMS-DB-SP-Event-Limit" class-name="org.opennms.netmgt.poller.monitors.JDBCStoredProcedureMonitor"/> (1)

1	Required monitor section.