CommandEventListener (NanoDB SQL Relational Database 0.1-SNAPSHOT API)

All Known Implementing Classes:

TransactionStateUpdater
```
public interface CommandEventListener
```
This interface can be implemented by components that need to do processing before and/or after a command is executed. Command-event listeners need to be registered on the EventDispatcher before they will be invoked.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`afterCommandExecuted(Command cmd)`	This method is called after a command is executed, to allow listeners to perform after-command processing.
`void`	`beforeCommandExecuted(Command cmd)`	This method is called before a command is executed, to allow listeners to perform before-command processing.

- Method Detail
  - beforeCommandExecuted
```
void beforeCommandExecuted(Command cmd)
```
    This method is called before a command is executed, to allow listeners to perform before-command processing.
    
    Parameters:
    
    cmd - the command about to be executed
  - afterCommandExecuted
```
void afterCommandExecuted(Command cmd)
```
    This method is called after a command is executed, to allow listeners to perform after-command processing.
    
    Parameters:
    
    cmd - the command that was just executed