org.apache.tapestry5.services

## Interface SessionPersistedObjectAnalyzer<T>

- All Known Implementing Classes:
    DefaultSessionPersistedObjectAnalyzer, OptimizedSessionPersistedObjectAnalyzer

      @UsesMappedConfiguration(key=java.lang.Class.class,
                               value=SessionPersistedObjectAnalyzer.class)
      public interface SessionPersistedObjectAnalyzer<T>

  Analyzes a session-persisted object, specifically to see if it is dirty or not. This service is provided to support applications which store mutable session attributes where the session is replicated to a slower medium (e.g. RDMBS, Cluster, etc) this can help alleviate excessive writes to the session store while ensuring changes are propagated. The service implementation uses a mapped configuration to form a strategy based on object type. The service may be injected using the `Primary` marker annotation.
  Since:
    5.1.0.0
  See Also:
    `ImmutableSessionPersistedObject`, `OptimizedSessionPersistedObject`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `checkAndResetDirtyState(T sessionPersistedObject)` Atomically check and reset the dirty state of the session persisted object.

- - ### Method Detail

    - #### checkAndResetDirtyState

          boolean checkAndResetDirtyState(T sessionPersistedObject)

      Atomically check and reset the dirty state of the session persisted object. The implementer should take consideration for the fact that session attributes are accessed concurrently. A naive check/set algorithm may allow changes to go un-noticed.
      Parameters:
        `sessionPersistedObject` - the session attribute (never null)
      Returns:
        true if the object needs to be re-stored into the session
      Since:
        5.3

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