Observer

All Known Implementing Classes:

EventGenerator
```
public interface Observer
```
This interface is used by the CardTerminalRegistry to communicate to an interested party added/remove card terminals and card insertion/removal. This interface decouples the opencard.core.event package from the opencard.core.terminal package and allows to use the terminal package without the events package in resource-constrained environments. It also allows framework users to implement their own events propagation mechanism.

See Also:

CardTerminalRegistry.setObserver(opencard.core.terminal.Observer)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`updateCards(CardTerminal t, int slot, boolean cardInserted)`	The CardTerminalRegistry calls this method when a card is inserted/ removed in one of the registered terminals.
`boolean`	`updateTerminals(Pollable p, boolean terminalAdded)`	The CardTerminalRegistry calls this method when a pollable terminal is added or removed

- Method Detail
  - updateCards
```
void updateCards(CardTerminal t,
                 int slot,
                 boolean cardInserted)
```
    The CardTerminalRegistry calls this method when a card is inserted/ removed in one of the registered terminals.
    For pollable terminals this works only if they are polled by the observer.
    
    Parameters:
    
    t - the terminal
    
    slot - the slot
    
    cardInserted - true for cardinsertions, false for card removals.
  - updateTerminals
```
boolean updateTerminals(Pollable p,
                        boolean terminalAdded)
```
    The CardTerminalRegistry calls this method when a pollable terminal is added or removed
    
    Parameters:
    
    p - The pollable terminal added/removed
    
    terminalAdded - true if the terminal is added, false if the terminal is removed