PersistenceManager

All Known Implementing Classes:

DBPersistenceManager, FilePersistenceManager
```
public interface PersistenceManager
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Clears the complete NV state from the DB
`java.io.Serializable`	`remove(java.io.Serializable key)`	Remove existing NV from being persisted
`java.util.Map`	`retrieveAll()`	Gives back the Map in last known state
`void`	`save(java.io.Serializable key, java.io.Serializable val)`	Save new NV pair as serializable objects or if already exist; store new state
`void`	`saveAll(java.util.Map map)`	Use to store a complete map into persistent state
`void`	`shutDown()`	Used to handle shutdown call the PersistenceManager implementation.

- Method Detail
  - save
```
void save(java.io.Serializable key,
          java.io.Serializable val)
   throws CannotPersistException
```
    Save new NV pair as serializable objects or if already exist; store new state
    
    Parameters:
    
    key -
    
    val -
    
    Throws:
    
    CannotPersistException
  - remove
```
java.io.Serializable remove(java.io.Serializable key)
                     throws CannotRemoveException
```
    Remove existing NV from being persisted
    
    Parameters:
    
    key - value
    
    Returns:
    
    Serializable; gives back the value
    
    Throws:
    
    CannotRemoveException
  - saveAll
```
void saveAll(java.util.Map map)
      throws CannotPersistException
```
    Use to store a complete map into persistent state
    
    Parameters:
    
    map -
    
    Throws:
    
    CannotPersistException
  - retrieveAll
```
java.util.Map retrieveAll()
                   throws CannotRetrieveException
```
    Gives back the Map in last known state
    
    Returns:
    
    Map;
    
    Throws:
    
    CannotRetrieveException
  - clear
```
void clear()
    throws CannotRemoveException
```
    Clears the complete NV state from the DB
    
    Throws:
    
    CannotRemoveException
  - shutDown
```
void shutDown()
```
    Used to handle shutdown call the PersistenceManager implementation. Persistent engines can leave this implementation empty.