org.apache.uima.resource

## Interface ConfigurationManager

-     public interface ConfigurationManager

  Manages the configuration parameters of all components within a possibly aggregate `Resource`. Note that the `ConfigurationManager` needs to make use of the `Session` object in order to store configuration settings that are specific to a particular client session.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `createContext(String aContextName, ResourceMetaData aResourceMetaData, Settings externalSettings)` Creates and sets up a new configuration parameter context.
    `ConfigurationParameterDeclarations` | `getConfigParameterDeclarations(String aContextName)` Gets the ConfigurationParameterDeclarations for the given context.
    `Object` | `getConfigParameterValue(String aQualifiedName)` Retrieves the value for a configuration parameter.
    `Object` | `getConfigParameterValue(String aQualifiedParamName, String aGroupName)` Retrieves the value for a configuration parameter in a group.
    `ConfigurationParameterSettings` | `getCurrentConfigParameterSettings(String aContextName)` Gets an object containing the current settings for all configuration parameters within the given context.
    `void` | `reconfigure(String aContextName)` Completes the reconfiguration of parameters within the specified context.
    `void` | `setConfigParameterValue(String aQualifiedParamName, Object aValue)` Sets the value of a configuration parameter.
    `void` | `setConfigParameterValue(String aQualifiedParamName, String aGroupName, Object aValue)` Sets the value of a configuration parameter in a group.
    `void` | `setSession(Session aSession)` Sets the current `Session`.

- - ### Method Detail

    - #### createContext

          void createContext(String aContextName,
                             ResourceMetaData aResourceMetaData,
                             Settings externalSettings)
                      throws ResourceConfigurationException

      Creates and sets up a new configuration parameter context. This method is called during the initialization of each Resource that uses this Configuration Manager. Validation will be performed on the configuration parameters declared in this context; if an error is found an exception will be thrown. Multi-threading: This may be called with the same parameters on multiple threads. Implementations should check for repeated calls to create the same context and just return in that case
      Parameters:
        `aContextName` - the name of the context in which the configuration parameter is being accessed. This corresponds to the path through the aggregate resource, e.g /subAE1/annotator1.
        `aResourceMetaData` - metadata object containing the configuration parameter declarations and settings.
        `externalSettings` - the external overrides
      Throws:
        `ResourceConfigurationException` - if the configuration settings are invalid

    - #### setSession

          void setSession(Session aSession)

      Sets the current `Session`. The Configuration Manager uses the `Session` object to store changes to configuration settings made by calling the `setConfigParameterValue` methods. This ensures that in a multi-client deployment those settings only apply to the same client that set them.

      Code that uses this class must be sure to call `setSession` before using the other methods (except `createContext`) on this class.

      Parameters:
        `aSession` - the session object used to store configuration parameter overrides made by a particular client.

    - #### getConfigParameterValue

          Object getConfigParameterValue(String aQualifiedName)

      Retrieves the value for a configuration parameter.
      Parameters:
        `aQualifiedName` - the fully-qualified configuration parameter name. This is of the form `ContextName + / + ParameterName`.
      Returns:
        the value of the parameter with the given name. The caller is expected to know the data type of the parameter. If the parameter does not exist,`null` is returned.

    - #### getConfigParameterValue

          Object getConfigParameterValue(String aQualifiedParamName,
                                         String aGroupName)

      Retrieves the value for a configuration parameter in a group.
      Parameters:
        `aQualifiedParamName` - the fully-qualified configuration parameter name. This is of the form `ContextName + / + ParameterName`.
        `aGroupName` - the name of the parameter group
      Returns:
        the value of the parameter with the given name. The caller is expected to know the data type of the parameter. If the parameter does not exist,`null` is returned.

    - #### setConfigParameterValue

          void setConfigParameterValue(String aQualifiedParamName,
                                       Object aValue)

      Sets the value of a configuration parameter. This only works for a parameter that is not defined in any group. Note that there is no guarantee that the change will take effect until `reconfigure(String)` is called.
      Parameters:
        `aQualifiedParamName` - the fully-qualified configuration parameter name. This is of the form `ContextName + / + ParameterName`.
        `aValue` - the value to assign to the parameter

    - #### setConfigParameterValue

          void setConfigParameterValue(String aQualifiedParamName,
                                       String aGroupName,
                                       Object aValue)

      Sets the value of a configuration parameter in a group. Note that there is no guarantee that the change will take effect until `reconfigure(String)` is called.
      Parameters:
        `aQualifiedParamName` - the fully-qualified configuration parameter name. This is of the form `ContextName + / + ParameterName`.
        `aGroupName` - the name of a configuration group. If this parameter is `null`, this method will have the same effect as `setParameterValue(String,Object)`.
        `aValue` - the value to assign to the parameter

    - #### reconfigure

          void reconfigure(String aContextName)
                    throws ResourceConfigurationException

      Completes the reconfiguration of parameters within the specified context. Also validates the parameter settings.
      Parameters:
        `aContextName` - the name of the context being reconfigured
      Throws:
        `ResourceConfigurationException` - if the new configuration is invalid

    - #### getConfigParameterDeclarations

          ConfigurationParameterDeclarations getConfigParameterDeclarations(String aContextName)

      Gets the ConfigurationParameterDeclarations for the given context.
      Parameters:
        `aContextName` - the name for which to get the parameter declarations
      Returns:
        parameter declarations for the context

    - #### getCurrentConfigParameterSettings

          ConfigurationParameterSettings getCurrentConfigParameterSettings(String aContextName)

      Gets an object containing the current settings for all configuration parameters within the given context.
      Parameters:
        `aContextName` - name of context for which to retrieve parameter settings
      Returns:
        an object containing the current configuration parameter settings

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