Replace IAsyncEventProcessor with IQueueingEventProcessor

After internal tests of the IAsyncEventProcessor approach (see !878 (merged)) in LHCb (see lhcb/LHCb!1939 (merged)), it turned out that an interface based on promises and futures it not adequate to the Gaudi event loop, so we decided to replace it with a queue based interface (see LBCOMP-21).

The new interface IQueueingEventProcessor is simple:

• void push(EventContext&&)
  • possibly blocking function to submit a new event for processing
• std::optional<std::tuple<StatusCode, EventContext>> pop()
  • non-blocking function to get the result of a processed event (the order may not match that of pushed events)
• bool empty() const
  • returns true if there's something in the system (either events being processed or results ready to be popped)

changed milestone to %v32r2

• [2019-09-04 12:32] Validation started with lhcb-gaudi-merge#814
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FYI: @nnolte @frankm

changed the description

changed title from Replace IAsyncEventLoopMgr with IQueueingEventProcessor to Replace IAsyncEventProcessor with IQueueingEventProcessor

changed the description

mentioned in merge request lhcb/LHCb!1939 (merged)

added 1 commit

• c024f896 - Apply suggestion to GaudiExamples/src/QueueingEventProcessor/QueueingEventLoopMgr.cpp

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added 31 commits

• c024f896...c3048316 - 24 commits from branch gaudi:master
• 1b6de27b - Add micro benchmark of asynchronous scheduling interfaces
• ad1f3921 - Add IQueueingEventProcessor interface and examples
• 41ce0a1c - Reduced the IQueueingEventProcessor interface to the minimum
• b04f7416 - Remove IAsyncEventLoopMgr
• 069d0735 - Revert "Add micro benchmark of asynchronous scheduling interfaces"
• 34b4feed - Apply suggestion to GaudiExamples/src/QueueingEventProcessor/QueueingEventLoopMgr.cpp
• 76b92f09 - Replace CPP macros with templated member function

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resolved all threads

added 1 commit

• 7d34a571 - Replace CPP macros with templated member function

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added 1 commit

• 2a089eb8 - Fix clang warning

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approved this merge request

merged

mentioned in commit 8a3b1102

mentioned in issue lhcb/LHCb#152