| Commit message (Collapse) | Author | Age |
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The error is now propagated to the top-most (user-owned) Future. When
an error occurs, no further tasks are executed. The first error handler
function in the chain is also called, if there's any.
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This is a simplified progress reporting, since it does not report progress
of ther overcall Job chain, but only of individual tasks, which makes it
only really useful on one-task Jobs.
TODO: propagate subjob progress to the Future user gets copy of
TODO: compound progress reporting (be able to report a progress of the overall
Job chain)
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Storing Future and current Job progress directly in Executors means
that we cannot re-execute finished job, or even execute the same Job
multiple times in parallel. To do so, we need to make Executors stateless
and track the state elsewhere.
This change does that by moving the execution state from Executor to Execution
class. Executors now only describe the tasks to execute, while Execution holds
the current state of execution. New Execution is created every time Job::exec()
is called.
Execution holds reference to it's result (Future) and Executor which created
the Execution. This ensures that Executor is not deleted when Job (which owns
Executors) goes out of scope while the execution is still running. At the same
time Future holds reference to relevant Execution, so that the Execution is
deleted when all copies of Future referring result from the respective Execution
are deleted.
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lifetime tests.
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It is now possible to chain a job that takes no arguments after a job
that returns void.
Unfortunatelly it is not yet possible to disregard return value of a
previous job.
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When user gets a Job (from a method call for instance), which is already running
or might have even finished already, they can still append a new Job to the chain
and re-execute it. The Job will internally chain up to the last finished Job, use
it's result and continue from the next Job in the chain. If a Job in the chain is
still running, it will wait for it to finish and pass the result to the next Job
in the chain.
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Now it's possible to do something like
Job<int, int> job = createSomeJob();
auto main = Async::start<int>(....).then(job);
Previously the 'job' would have to be wrapped in a ThenTask-like lambda (which
is what we still do internally), but with this new syntax it's possible to append
another job chain to existing chain easilly. This syntax is available for all
task types.
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The initial value can be passed in as argument to Job::exec(), or by another
job in case of job chaining.
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Sync executors don't pass Async::Future into the user-provided tasks, but
instead work with return values of the task methods, wrapping them into the
Async::Future internally. Sync tasks are of course possible since forever, but
not the API for those tasks is much cleaner, for users don't have to deal with
"future" in synchronous tasks, for instance when synchronously processing results
of an async task before passing the data to another async task.
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innerJob.exec() starts an async job, so once exec() returns, the innerJob
will go out of scope and will be deleted, which however does not prevent
the QTimer from invoking it's lambda slot, which will crash when dereferencing
a deleted Future.
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Now calling exec() starts the first job and returns a pending Future immediately. Caller
can then use Async::FutureWatcher to wait for the future to become finished, i.e. for all
jobs to finish execution.
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As of now, Job is only front interface to a chain of Executor subclasses. Each
Executor subclass specializes for given type of execution (then, each, reduce, ...),
and the chain is then executed recursively, as we did with the original Job
implementation.
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We now pass our own Async::Future to each task, instead of expecting tasks
to return their future. This allows us to re-use the same Future for repeated
invocations, like in the Each task.
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