DerivedMetricSource (platform/sdk 5.6.1.0 API)

```
public interface DerivedMetricSource
```
Interface implemented by any class which can derive new metrics from other metrics. Derived metrics are not stored on the server and are not known about by AIE nodes themselves.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.List<MetricInstance>`	`createMetricInstances()`
`MetricData`	`getDataByMetricInstance(java.util.Date start, java.util.Date end, long period, long id)`
`MetricData`	`getLastDataByMetricInstance(long id)`
`void`	`setMetricTemplate(Metric template)`	template for the derived metric
`void`	`setMonitoringApi(MonitoringApi monitoringApi)`	set the api that is used to fetch source metrics
`void`	`validate()`	throws IllegalStateException if the parameters for the source are not valid

- Method Detail
  - validate
```
void validate()
```
    throws IllegalStateException if the parameters for the source are not valid
  - createMetricInstances
```
java.util.List<MetricInstance> createMetricInstances()
```
    Returns:
    
    the list of metrics this source provides
  - getDataByMetricInstance
```
MetricData getDataByMetricInstance(java.util.Date start,
                                   java.util.Date end,
                                   long period,
                                   long id)
```
    Returns:
    
    the derived metrics over the time period indicated
  - getLastDataByMetricInstance
```
MetricData getLastDataByMetricInstance(long id)
```
    Returns:
    
    compute and return the last data point in this derived metric
  - setMonitoringApi
```
void setMonitoringApi(MonitoringApi monitoringApi)
```
    set the api that is used to fetch source metrics
  - setMetricTemplate
```
void setMetricTemplate(Metric template)
```
    template for the derived metric