javax.resource.spi

## Interface ManagedConnection

-     public interface ManagedConnection

  ManagedConnection instance represents a physical connection to the underlying EIS.

  A ManagedConnection instance provides access to a pair of interfaces: `javax.transaction.xa.XAResource` and `javax.resource.spi.LocalTransaction`.

  `XAResource` interface is used by the transaction manager to associate and dissociate a transaction with the underlying EIS resource manager instance and to perform two-phase commit protocol. The ManagedConnection interface is not directly used by the transaction manager. More details on the XAResource interface are described in the JTA specification.

  The LocalTransaction interface is used by the application server to manage local transactions.

  Version:
    0.5
  Author:
    Rahul Sharma
  See Also:
    `ManagedConnectionFactory`, `XAResource`, `LocalTransaction`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addConnectionEventListener(ConnectionEventListener listener)` Adds a connection event listener to the ManagedConnection instance.
    `void` | `associateConnection(Object connection)` Used typically by the container to change the association of an application-level connection handle with a ManagedConneciton instance.
    `void` | `cleanup()` Application server calls this method to force any cleanup on the ManagedConnection instance.
    `void` | `destroy()` Destroys the physical connection to the underlying resource manager.
    `Object` | `getConnection(Subject subject, ConnectionRequestInfo cxRequestInfo)` Creates a new connection handle for the underlying physical connection represented by the ManagedConnection instance.
    `LocalTransaction` | `getLocalTransaction()` Returns an `javax.resource.spi.LocalTransaction` instance.
    `PrintWriter` | `getLogWriter()` Gets the log writer for this ManagedConnection instance.
    `ManagedConnectionMetaData` | `getMetaData()` Gets the metadata information for this connection's underlying EIS resource manager instance.
    `XAResource` | `getXAResource()` Returns an `javax.transaction.xa.XAresource` instance.
    `void` | `removeConnectionEventListener(ConnectionEventListener listener)` Removes an already registered connection event listener from the ManagedConnection instance.
    `void` | `setLogWriter(PrintWriter out)` Sets the log writer for this ManagedConnection instance.

- - ### Method Detail

    - #### getConnection

          Object getConnection(Subject subject,
                             ConnectionRequestInfo cxRequestInfo)
                               throws ResourceException

      Creates a new connection handle for the underlying physical connection represented by the ManagedConnection instance. This connection handle is used by the application code to refer to the underlying physical connection. This connection handle is associated with its ManagedConnection instance in a resource adapter implementation specific way.

      The ManagedConnection uses the Subject and additional ConnectionRequest Info (which is specific to resource adapter and opaque to application server) to set the state of the physical connection.

      Parameters:
        `subject` - security context as JAAS subject
        `cxRequestInfo` - ConnectionRequestInfo instance
      Returns:
        generic Object instance representing the connection handle. For CCI, the connection handle created by a ManagedConnection instance is of the type javax.resource.cci.Connection.
      Throws:
        `ResourceException` - generic exception if operation fails
        `ResourceAdapterInternalException` - resource adapter internal error condition
        `SecurityException` - security related error condition
        `CommException` - failed communication with EIS instance
        `EISSystemException` - internal error condition in EIS instance - used if EIS instance is involved in setting state of ManagedConnection

    - #### destroy

          void destroy()
                       throws ResourceException

      Destroys the physical connection to the underlying resource manager.

      To manage the size of the connection pool, an application server can explictly call ManagedConnection.destroy to destroy a physical connection. A resource adapter should destroy all allocated system resources for this ManagedConnection instance when the method destroy is called.

      Throws:
        `ResourceException` - generic exception if operation failed
        `IllegalStateException` - illegal state for destroying connection

    - #### cleanup

          void cleanup()
                       throws ResourceException

      Application server calls this method to force any cleanup on the ManagedConnection instance.

      The method ManagedConnection.cleanup initiates a cleanup of the any client-specific state as maintained by a ManagedConnection instance. The cleanup should invalidate all connection handles that had been created using this ManagedConnection instance. Any attempt by an application component to use the connection handle after cleanup of the underlying ManagedConnection should result in an exception.

      The cleanup of ManagedConnection is always driven by an application server. An application server should not invoke ManagedConnection.cleanup when there is an uncompleted transaction (associated with a ManagedConnection instance) in progress.

      The invocation of ManagedConnection.cleanup method on an already cleaned-up connection should not throw an exception.

      The cleanup of ManagedConnection instance resets its client specific state and prepares the connection to be put back in to a connection pool. The cleanup method should not cause resource adapter to close the physical pipe and reclaim system resources associated with the physical connection.

      Throws:
        `ResourceException` - generic exception if operation fails
        `ResourceAdapterInternalException` - resource adapter internal error condition
        `IllegalStateException` - Illegal state for calling connection cleanup. Example - if a localtransaction is in progress that doesn't allow connection cleanup

    - #### associateConnection

          void associateConnection(Object connection)
                                   throws ResourceException

      Used typically by the container to change the association of an application-level connection handle with a ManagedConneciton instance. The container should find the right ManagedConnection instance and call the associateConnection method. In order to set a Connection Handle as the active connection handle, the container may also use the `associateConnection` method to set the same `ManagedConnection` associated with the Connection handle.

      The resource adapter is required to implement the associateConnection method. The method implementation for a ManagedConnection should dissociate the connection handle (passed as a parameter) from its currently associated ManagedConnection and associate the new connection handle with itself.

      Parameters:
        `connection` - Application-level connection handle
      Throws:
        `ResourceException` - Failed to associate the connection handle with this ManagedConnection instance
        `IllegalStateException` - Illegal state for invoking this method
        `ResourceAdapterInternalException` - Resource adapter internal error condition

    - #### addConnectionEventListener

          void addConnectionEventListener(ConnectionEventListener listener)

      Adds a connection event listener to the ManagedConnection instance.

      The registered ConnectionEventListener instances are notified of connection close and error events, also of local transaction related events on the Managed Connection.

      Parameters:
        `listener` - a new ConnectionEventListener to be registered

    - #### removeConnectionEventListener

          void removeConnectionEventListener(ConnectionEventListener listener)

      Removes an already registered connection event listener from the ManagedConnection instance.
      Parameters:
        `listener` - already registered connection event listener to be removed

    - #### getXAResource

          XAResource getXAResource()
                                   throws ResourceException

      Returns an `javax.transaction.xa.XAresource` instance. An application server enlists this XAResource instance with the Transaction Manager if the ManagedConnection instance is being used in a JTA transaction that is being coordinated by the Transaction Manager.
      Returns:
        XAResource instance
      Throws:
        `ResourceException` - generic exception if operation fails
        `NotSupportedException` - if the operation is not supported
        `ResourceAdapterInternalException` - resource adapter internal error condition

    - #### getLocalTransaction

          LocalTransaction getLocalTransaction()
                                               throws ResourceException

      Returns an `javax.resource.spi.LocalTransaction` instance. The LocalTransaction interface is used by the container to manage local transactions for a RM instance.
      Returns:
        LocalTransaction instance
      Throws:
        `ResourceException` - generic exception if operation fails
        `NotSupportedException` - if the operation is not supported
        `ResourceAdapterInternalException` - resource adapter internal error condition

    - #### getMetaData

          ManagedConnectionMetaData getMetaData()
                                                throws ResourceException

      Gets the metadata information for this connection's underlying EIS resource manager instance. The ManagedConnectionMetaData interface provides information about the underlying EIS instance associated with the ManagedConenction instance.

      Returns:
        ManagedConnectionMetaData instance
      Throws:
        `ResourceException` - generic exception if operation fails
        `NotSupportedException` - if the operation is not supported

    - #### setLogWriter

          void setLogWriter(PrintWriter out)
                            throws ResourceException

      Sets the log writer for this ManagedConnection instance.

      The log writer is a character output stream to which all logging and tracing messages for this ManagedConnection instance will be printed. Application Server manages the association of output stream with the ManagedConnection instance based on the connection pooling requirements.

      When a ManagedConnection object is initially created, the default log writer associated with this instance is obtained from the ManagedConnectionFactory. An application server can set a log writer specific to this ManagedConnection to log/trace this instance using setLogWriter method.

      Parameters:
        `out` - Character Output stream to be associated
      Throws:
        `ResourceException` - generic exception if operation fails
        `ResourceAdapterInternalException` - resource adapter related error condition

    - #### getLogWriter

          PrintWriter getLogWriter()
                                   throws ResourceException

      Gets the log writer for this ManagedConnection instance.

      The log writer is a character output stream to which all logging and tracing messages for this ManagedConnection instance will be printed. ConnectionManager manages the association of output stream with the ManagedConnection instance based on the connection pooling requirements.

      The Log writer associated with a ManagedConnection instance can be one set as default from the ManagedConnectionFactory (that created this connection) or one set specifically for this instance by the application server.

      Returns:
        Character ourput stream associated with this Managed- Connection instance
      Throws:
        `ResourceException` - generic exception if operation fails

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