For example, a client could receive metadata from the server about a file at /baz/cat before receiving its parent directory at /baz. Sync Engine Classic’s client-server protocol often resulted in a set of possible sync states far too permissive for us to be able to test effectively. Dropbox has evolved quite a bit in the 12+ years since we designed the original system, and the requirements have changed greatly. Why wasn’t the old system testable? What made it so hard to avoid regressions and maintain correctness in that system? And what did we learn that informed the architecture of our new system? Protocol and data modelįor one, the server-client protocol and data model of Sync Engine Classic were designed for a simpler time and a simpler product, before Dropbox had sharing, before Dropbox had comments and annotations, and before Dropbox was used by thousand-person enterprise teams. We can look to Sync Engine Classic, the legacy system, for insights.

Acceptance of the Application's Terms of Conditions or End User License Agreement may bind the institution to an agreement thereby requiring legal counsel to review the application contract.When we embarked on the rewrite, one thing was clear: to have a robust testing strategy, the new system would have to be testable! Emphasizing testability early, even before implementing the associated testing frameworks, was critical to ensuring that our architecture was informed appropriately.

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Application collects information that is confidential (physical address, drivers licence number, health card number, social insurance number).Application collects information that could identify the user specifically (email address, class schedule, etc.).It is highly recommended that users do not use the same username and password that is in use at Western. Users are required to create and use a non-Western account.

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