IQueueingEventProcessor.h

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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