Class AbstractBackendListenerClient

  • All Implemented Interfaces:
    BackendListenerClient
    Direct Known Subclasses:
    GraphiteBackendListenerClient

    public abstract class AbstractBackendListenerClient
    extends Object
    implements BackendListenerClient
    An abstract implementation of the BackendListenerClient interface. This implementation provides default implementations of most of the methods in the interface, as well as some convenience methods, in order to simplify development of BackendListenerClient implementations. While it may be necessary to make changes to the BackendListenerClient interface from time to time (therefore requiring changes to any implementations of this interface), we intend to make this abstract class provide reasonable implementations of any new methods so that subclasses do not necessarily need to be updated for new versions. Therefore, when creating a new BackendListenerClient implementation, developers are encouraged to subclass this abstract class rather than implementing the BackendListenerClient interface directly. Implementing BackendListenerClient directly will continue to be supported for cases where extending this class is not possible (for example, when the client class is already a subclass of some other class).

    The BackendListenerClient.handleSampleResults(java.util.List, BackendListenerContext) method of BackendListenerClient does not have a default implementation here, so subclasses must define at least this method. It may be useful to override other methods as well.

    Since:
    2.13
    See Also:
    BackendListener.sampleOccurred(org.apache.jmeter.samplers.SampleEvent)
    • Constructor Detail

      • AbstractBackendListenerClient

        public AbstractBackendListenerClient()
    • Method Detail

      • setupTest

        public void setupTest​(BackendListenerContext context)
                       throws Exception
        Description copied from interface: BackendListenerClient
        Do any initialization required by this client. It is generally recommended to do any initialization such as getting parameter values in the setupTest method rather than the runTest method in order to add as little overhead as possible to the test.
        Specified by:
        setupTest in interface BackendListenerClient
        Parameters:
        context - the context to run with. This provides access to initialization parameters. Context is readonly
        Throws:
        Exception - when setup fails
      • getDefaultParameters

        public Arguments getDefaultParameters()
        Description copied from interface: BackendListenerClient
        Provide a list of parameters which this test supports. Any parameter names and associated values returned by this method will appear in the GUI by default so the user doesn't have to remember the exact names. The user can add other parameters which are not listed here. If this method returns null then no parameters will be listed. If the value for some parameter is null then that parameter will be listed in the GUI with an empty value.
        Specified by:
        getDefaultParameters in interface BackendListenerClient
        Returns:
        a specification of the parameters used by this test which should be listed in the GUI, or null if no parameters should be listed.
      • getLogger

        protected Logger getLogger()
        Get a Logger instance which can be used by subclasses to log information. As this class is designed to be subclassed this is useful.
        Returns:
        a Logger instance which can be used for logging
      • getSamplerMetric

        protected final SamplerMetric getSamplerMetric​(String sampleLabel)
        Parameters:
        sampleLabel - Name of sample used as key
        Returns:
        SamplerMetric