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Method 4: Mainline Plus Sandboxes Plus Synchronization

Some big changes may require several integrations before the change is complete; this can make our integration tricky. You can address this potential problem by adding a synchronization operation that brings others' changes into your sandbox.

Synchronization can be mixed in while you're doing your changes:

  1. Synchronize:

    1. Lock.
    2. Integrate mainline into sandbox.
    3. Unlock.

Some source-control systems go further, providing a "preview" that identifies the files that would require integration, without actually bringing the changed files to the sandbox.

With this refinement, you get the following advantages:

  • Programmers can still work in parallel.

  • Integration is easier.

  • Integration is still transactional.

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