ApplicationStatePersistenceStrategy (Tapestry API - 5.7.2)

All Known Implementing Classes:

EntityApplicationStatePersistenceStrategy, EntityApplicationStatePersistenceStrategy, SessionApplicationStatePersistenceStrategy
```
public interface ApplicationStatePersistenceStrategy
```
Used by ApplicationStateManager to manage a specific kind of Session State Object (SSO) persistence. The strategy is responsible for managing SSO instances within its domain.
NOTE: The term "Application" here is a hold-over from Tapestry 5.0, which used the @ApplicationState (deprecated and deleted) annotation, and called them "ASOs" (Application State Objects). This service would be better named "SessionStatePersistenceStrategy" (but renaming it would cause backwards compatibility issues).

See Also:

ApplicationStatePersistenceStrategySource

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`<T> boolean`	`exists(Class<T> ssoClass)`	Returns true if the SSO already exists, false if null.
`<T> T`	`get(Class<T> ssoClass, ApplicationStateCreator<T> creator)`	Gets the SSO from the domain.
`default <T> T`	`getIfExists(Class<T> ssoClass)`	Returns the SSO if it exists or null.
`<T> void`	`set(Class<T> ssoClass, T sso)`	Stores a new SSO, possibly replacing the existing one.

- Method Detail
  - get
```
<T> T get(Class<T> ssoClass,
          ApplicationStateCreator<T> creator)
```
    Gets the SSO from the domain. If the SSO does not already exist, it is created and stored, then returned.
  - set
```
<T> void set(Class<T> ssoClass,
             T sso)
```
    Stores a new SSO, possibly replacing the existing one.
    
    Type Parameters:
    
    T -
    
    Parameters:
    
    ssoClass -
    
    sso - instance to store, or null to delete existing
  - exists
```
<T> boolean exists(Class<T> ssoClass)
```
    Returns true if the SSO already exists, false if null.
  - getIfExists
```
default <T> T getIfExists(Class<T> ssoClass)
```
    Returns the SSO if it exists or null.