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Having to pass ConnectionData to each and every job class was nothing but boilerplate since the very beginning. Removing it required to prepend BaseJob::start() with ConnectionData-setting code, and to provide a way to alter the request configuration depending on the (late-coming) ConnectionData object. This is a new responsibility of BaseJob::start(); the previous BaseJob::start() contents have moved to BaseJob::sendRequest() (which is now invoked on retries, instead of start()).
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Mainly it's about const-ification (in particular, passing const-refs instead of values) and deleting unneeded declarations/#includes. Since the changes alter the external interface, this is submitted as a PR for peer review.
One of unneeded declarations/definitions is a virtual destructor in BaseJob descendants. Since a job object should be deleted through QObject::deleteLater() anyway (and it's the only correct way of disposing of the object), all deletions will call the stack of destructors through virtual QObject::~QObject(). Therefore even BaseJob could get on with a non-virtual destructor but for the sake of clarity BaseJob::~BaseJob() is still declared virtual.
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data() in each job class
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return it
This better fixes the contract for derived job classes and simplifies error reporting. Methods error() and errorString() are kept for back-compatibility; status() returns a combination of them, conveniently packed into a Status object. For a quick status check, Status::good() is provided.
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data()
Thanks to CLang model.
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