Using Your Model › Locking Objects

Locking Objects

Locks are used to prevent two developers from updating and/or accessing the same object at the same time; they apply to both interactive and batch jobs. An object is locked while it is in use.CA 2E provides the following categories of locks:

• Object locks—Object locks apply to functions and access paths and can be:
  • Temporary—A developer is using or updating an access path or function.
  • Permanent—A designer is preventing all changes to an access path or function.
• File locks—File locks apply only to files and can be:
  • *READ—(Read Lock) A developer is using the file.
  • *EXCL—(Exclusive Lock) A designer is updating the file.
  • *SYNC—(Synchronize Lock) A designer has left the model without expanding an updated file; the existing *EXCL lock is converted to a *SYNC lock.
• Field locks—Field locks are functionally similar to object locks and apply only to fields. They can be:
  • *READ—(Read Lock) A developer is using the field.
  • *EXCL—(Exclusive Lock) A designer is updating the field. An *EXCL field lock can cause implicit *EXCL locks to be set on other fields and files.

The following table gives an overview of the three categories of locks. Each is discussed in more detail in this section.