WAS v8.5 > Monitoring > Monitoring overall system health > Develop custom PMI monitoring applications

Use PMI client to develop your monitoring application (deprecated)

We can use the PMI interfaces to develop our own applications to collect and display performance information.

The following is the programming model for Performance Monitoring Infrastructure (PMI) client:

1. Create an instance of PmiClient. This is used for all subsequent method calls.

2. Optional: We can create our own MBeans. See the extending the WebSphere Application Server administrative system with custom MBeans for more information.
3. Call the listNodes() and listServers(nodeName) methods to find all the nodes and servers in the WAS domain. The PMI client provides two sets of methods: one set in v5.0 and the other set inherited from Version 4.0. We can only use one set of methods. Do not mix them together.
4. Call listMBeans and listStatMembers to get all the available MBeans and MBeanStatDescriptors.
5. Call the getStats method to get the Stats object for the PMI data.

6. Optional: The client can also call setStatLevel or getStatLevel to set and get the monitoring level. Use the MBeanLevelSpec objects to set monitoring levels.

If you prefer to use the Version 4.0 interface, the model is essentially the same, but the object types are different:

1. Create an instance of PmiClient.
2. Call the listNodes() and listServers(nodeName) methods to find all the nodes and servers in the WAS domain.
3. Call listMembers to get all the perfDescriptor objects.

4. Use the PMI client's get or gets method to get CpdCollection objects. These contain snapshots of performance data from the server. The same structure is maintained and its update method is used to refresh the data.

5. Optional. The client can also call setInstrumentationLevel or getInstrumentationLevel to set and get the monitoring level.

Subtopics

• Performance Monitoring Infrastructure client (WebSphere Version 4.0)
  A PMI client is an application that receives PMI data from servers and processes this data.
• Performance Monitoring Infrastructure client (WebSphere Version 4.0)
  A PMI client is an application that receives PMI data from servers and processes this data.

Related

Extend the WAS administrative system with custom MBeans

Reference:

Performance Monitoring Infrastructure client package
PMI client interface (deprecated)

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