IQueueingEventProcessor.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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* granted to it by virtue of its status as an Intergovernmental Organization        *
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#pragma once
 
#include <GaudiKernel/EventContext.h>
#include <GaudiKernel/IEventProcessor.h>
#include <GaudiKernel/StatusCode.h>
#include <optional>
#include <tuple>
 
namespace Gaudi::Interfaces {
  struct IQueueingEventProcessor : virtual IEventProcessor {
    DeclareInterfaceID( IQueueingEventProcessor, 1, 0 );
 
    using ResultType = std::tuple<StatusCode, EventContext>;
 
    virtual void push( EventContext&& ctx ) = 0;
 
    virtual bool empty() const = 0;
 
    virtual std::optional<ResultType> pop() = 0;
  };
} // namespace Gaudi::Interfaces