88 lines
1.9 KiB
C++
88 lines
1.9 KiB
C++
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/*
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* This file Copyright (C) 2016 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <cassert>
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#include "RpcQueue.h"
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RpcQueue::RpcQueue (QObject * parent):
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QObject (parent),
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myTolerateErrors (false)
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{
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connect (&myFutureWatcher, SIGNAL (finished ()), SLOT (stepFinished ()));
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}
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RpcResponseFuture
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RpcQueue::future ()
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{
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return myPromise.future ();
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}
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void
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RpcQueue::stepFinished ()
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{
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RpcResponse result;
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if (myFutureWatcher.future ().isResultReadyAt (0))
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{
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result = myFutureWatcher.result ();
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RpcResponseFuture future = myFutureWatcher.future ();
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// we can't handle network errors, abort queue and pass the error upwards
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if (result.networkError != QNetworkReply::NoError)
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{
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assert (!result.success);
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myPromise.reportFinished (&result);
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deleteLater ();
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return;
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}
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// call user-handler for ordinary errors
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if (!result.success && myNextErrorHandler)
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{
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myNextErrorHandler (future);
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}
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// run next request, if we have one to run and there was no error (or if we tolerate errors)
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if ((result.success || myTolerateErrors) && !myQueue.isEmpty ())
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{
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runNext (future);
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return;
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}
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}
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else
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{
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assert (!myNextErrorHandler);
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assert (myQueue.isEmpty ());
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// one way or another, the last step returned nothing.
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// assume it is OK and ensure that we're not going to give an empty response object to any of the next steps.
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result.success = true;
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}
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myPromise.reportFinished (&result);
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deleteLater ();
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}
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void
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RpcQueue::runNext (const RpcResponseFuture& response)
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{
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assert (!myQueue.isEmpty ());
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auto next = myQueue.dequeue ();
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myNextErrorHandler = next.second;
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myFutureWatcher.setFuture ((next.first) (response));
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}
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void
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RpcQueue::run ()
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{
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runNext (RpcResponseFuture ());
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}
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