DriverClient.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#ifndef O2_FRAMEWORK_DRIVERCLIENT_H_
#define O2_FRAMEWORK_DRIVERCLIENT_H_
 
#include "Framework/ServiceHandle.h"
#include "Framework/ServiceRegistryRef.h"
#include <functional>
#include <string>
#include <string_view>
#include <vector>
 
namespace o2::framework
{
 
struct DriverEventMatcher {
  std::string prefix;
  std::function<void(std::string_view)> callback;
};
 
class DriverClient
{
 public:
  constexpr static ServiceKind service_kind = ServiceKind::Global;
 
  virtual void tell(char const* msg, size_t s, bool flush = true) = 0;
  void tell(std::string_view const& msg, bool flush = true)
  {
    tell(msg.data(), msg.size(), flush);
  };
 
  void observe(char const* eventType, std::function<void(std::string_view)> callback);
 
  void dispatch(std::string_view event);
 
  virtual void flushPending(ServiceRegistryRef mainThreadRef) = 0;
 
 private:
  std::vector<DriverEventMatcher> mEventMatchers;
};
 
} // namespace o2::framework
 
#endif // O2_FRAMEWORK_DRIVERCLIENT_H_