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## org.apache.axis2.clustering.state
Interface StateManager

All Superinterfaces:
  ParameterInclude

    public interface StateManager

extends ParameterInclude

This interface is responsible for handling context replication. The property changes in the Axis2 context hierarchy in this node, are propagated to all other nodes in the cluster.

It is not mandatory to have a StateManager in a node. If we are not interested in High Availability, we may disable context replication by commenting out the "contextManager" section in the axis2.xml cluster configuration section. In such a scenatio, the cluster will be used only for the purpose of Scalability

The implementation of this interface is set by the `ClusterBuilder`, by reading the "contextManager" element in the axis2.xml

e.g. ``

Method Summary
`Map` | `getReplicationExcludePatterns()` Get all the excluded context property name patterns
`boolean` | `isContextClusterable(AbstractContext context)` This is a check to see whether the properties in an instance of `AbstractContext` should be replicated.
`void` | `removeContext(AbstractContext context)` This method is called when `AbstractContext` is removed from the system
`void` | `replicateState(StateClusteringCommand command)` Replicate state using a custom StateClusteringCommand
`void` | `setConfigurationContext(ConfigurationContext configurationContext)` Set the system's configuration context.
`void` | `setReplicationExcludePatterns(String contextType, List patterns)` All properties in the context with type `contextType` which have names that match the specified pattern will be excluded from replication.
`void` | `updateContext(AbstractContext context)` This method is called when properties in an `AbstractContext` are updated.
`void` | `updateContext(AbstractContext context, String[] propertyNames)` This method is called when one need to update/replicate only certains properties in the specified `context`
`void` | `updateContexts(AbstractContext[] contexts)` This method is called when properties in a collection of `AbstractContext`s are updated.

Methods inherited from interface org.apache.axis2.description.ParameterInclude
`addParameter, deserializeParameters, getParameter, getParameters, isParameterLocked, removeParameter`

Method Detail

### updateContext

    void updateContext(AbstractContext context)
                       throws ClusteringFault

  This method is called when properties in an `AbstractContext` are updated. This could be addition of new properties, modifications of existing properties or removal of properties.

  Parameters:
    `context` - The context to be replicated
  Throws:
    `ClusteringFault` - If replication fails

### updateContext

    void updateContext(AbstractContext context,
                       String[] propertyNames)
                       throws ClusteringFault

  This method is called when one need to update/replicate only certains properties in the specified `context`

  Parameters:
    `context` - The AbstractContext containing the properties to be replicated
    `propertyNames` - The names of the specific properties that should be replicated
  Throws:
    `ClusteringFault` - If replication fails

### updateContexts

    void updateContexts(AbstractContext[] contexts)
                        throws ClusteringFault

  This method is called when properties in a collection of `AbstractContext`s are updated. This could be addition of new properties, modifications of existing properties or removal of properties.

  Parameters:
    `contexts` - The AbstractContexts containing the properties to be replicated
  Throws:
    `ClusteringFault` - If replication fails

### replicateState

    void replicateState(StateClusteringCommand command)
                        throws ClusteringFault

  Replicate state using a custom StateClusteringCommand

  Parameters:
    `command` - The custom StateClusteringCommand which can be used for replicating state
  Throws:
    `ClusteringFault` - If replication fails

### removeContext

    void removeContext(AbstractContext context)
                       throws ClusteringFault

  This method is called when `AbstractContext` is removed from the system

  Parameters:
    `context` - The AbstractContext to be removed
  Throws:
    `ClusteringFault` - If context removal fails

### isContextClusterable

    boolean isContextClusterable(AbstractContext context)

  This is a check to see whether the properties in an instance of `AbstractContext` should be replicated. This allows an implementer to dissallow the replication of properties stored in a certain type of context

  Parameters:
    `context` - The instance of AbstractContext under consideration
  Returns:
    True - if the provided `AbstractContext` is clusterable

### setConfigurationContext

    void setConfigurationContext(ConfigurationContext configurationContext)

  Set the system's configuration context. This will be used by the clustering implementations to get information about the Axis2 environment and to correspond with the Axis2 environment

  Parameters:
    `configurationContext` - The configuration context

### setReplicationExcludePatterns

    void setReplicationExcludePatterns(String contextType,
                                       List patterns)

  All properties in the context with type `contextType` which have names that match the specified pattern will be excluded from replication.

  Only prefixes and suffixes are allowed. e.g. the local_* pattern indicates that all property names starting with local_ should be omitted from replication. *_local pattern indicated that all property names ending with _local should be omitted from replication. * pattern indicates that all properties should be excluded.

  Generally, we can use the context class name as the context type.

  Parameters:
    `contextType` - The type of the context such as org.apache.axis2.context.ConfigurationContext, org.apache.axis2.context.ServiceGroupContext & org.apache.axis2.context.ServiceContext. Also "defaults" is a special type, which will apply to all contexts
    `patterns` - The patterns

### getReplicationExcludePatterns

    Map getReplicationExcludePatterns()

  Get all the excluded context property name patterns

  Returns:
    All the excluded pattern of all the contexts. The key of the Map is the the `contextType`. See `setReplicationExcludePatterns(String,List)`. The values are of type `List` of `String` Objects, which are a collection of patterns to be excluded.
  See Also:
    `setReplicationExcludePatterns(String, java.util.List)`

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