VariableInstanceLog (KIE :: Public API 8.28.0.Beta API)

```
public interface VariableInstanceLog
```
Audit view of variables that keeps track of all changes of variable identified by given name/id. This means that variable log will contain both current and previous (if exists) value of the variable.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Date`	`getDate()`
`String`	`getExternalId()`
`String`	`getOldValue()`
`String`	`getProcessId()`
`Long`	`getProcessInstanceId()`
`String`	`getValue()`
`String`	`getVariableId()`
`String`	`getVariableInstanceId()`

- Method Detail
  - getProcessInstanceId
```
Long getProcessInstanceId()
```
    Returns:
    
    process instance identifier
  - getProcessId
```
String getProcessId()
```
    Returns:
    
    process id of the definition
  - getVariableInstanceId
```
String getVariableInstanceId()
```
    Returns:
    
    additional information in case variable is defined on composite node level to be able to distinguish it between top level and embedded level variables
  - getVariableId
```
String getVariableId()
```
    Returns:
    
    identifier of the variable aka variable name
  - getValue
```
String getValue()
```
    Returns:
    
    current value of the variable
  - getOldValue
```
String getOldValue()
```
    Returns:
    
    previous value of the variable (if any)
  - getDate
```
Date getDate()
```
    Returns:
    
    date when the variable was set (to current value)
  - getExternalId
```
String getExternalId()
```
    Returns:
    
    external (optional) identifier associated with this process instance