Module java.transaction.xa
Package javax.transaction.xa

## Interface Xid

-     public interface Xid

  The Xid interface is a Java mapping of the X/Open transaction identifier XID structure. This interface specifies three accessor methods to retrieve a global transaction format ID, global transaction ID, and branch qualifier. The Xid interface is used by the transaction manager and the resource managers. This interface is not visible to the application programs.
  Since:
    1.4

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static int` | `MAXBQUALSIZE` | Maximum number of bytes returned by `getBranchQualifier()`.
    `static int` | `MAXGTRIDSIZE` | Maximum number of bytes returned by `getGlobalTransactionId()`.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `byte[]` | `getBranchQualifier()` | Obtain the transaction branch identifier part of XID as an array of bytes.
    `int` | `getFormatId()` | Obtain the format identifier part of the XID.
    `byte[]` | `getGlobalTransactionId()` | Obtain the global transaction identifier part of XID as an array of bytes.

- - ### Field Detail

    - #### MAXGTRIDSIZE

          static final int MAXGTRIDSIZE

      Maximum number of bytes returned by `getGlobalTransactionId()`.
      See Also:
        Constant Field Values

    - #### MAXBQUALSIZE

          static final int MAXBQUALSIZE

      Maximum number of bytes returned by `getBranchQualifier()`.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getFormatId

          int getFormatId()

      Obtain the format identifier part of the XID.
      Returns:
        Format identifier. O means the OSI CCR format.

    - #### getGlobalTransactionId

          byte[] getGlobalTransactionId()

      Obtain the global transaction identifier part of XID as an array of bytes.
      Returns:
        Global transaction identifier.

    - #### getBranchQualifier

          byte[] getBranchQualifier()

      Obtain the transaction branch identifier part of XID as an array of bytes.
      Returns:
        Global transaction identifier.