File: clients.h

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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_CLIENTS_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_CLIENTS_H_

#include <map>
#include <memory>
#include <string>

#include "base/component_export.h"
#include "components/download/public/background_service/client.h"

namespace download {

// A list of all clients that are able to make download requests through the
// DownloadService.
// To add a new client, update the metric DownloadService.DownloadClients in
// histograms.xml and make sure to keep this list in sync.  Additions should be
// treated as APPEND ONLY to make sure to keep both UMA metric semantics correct
// but also to make sure the underlying database properly associates each
// download with the right client.
enum class DownloadClient {
  // Test client values.  Meant to be used by the testing framework and not
  // production code.  Callers will be unable to access the DownloadService with
  // these test APIs.
  TEST = -1,
  TEST_2 = -2,
  TEST_3 = -3,

  // Represents an uninitialized DownloadClient variable.
  INVALID = 0,

  OFFLINE_PAGE_PREFETCH = 1,

  BACKGROUND_FETCH = 2,

  // Used by debug surfaces in the app (the WebUI, for example).
  DEBUGGING = 3,

  MOUNTAIN_INTERNAL = 4,

  PLUGIN_VM_IMAGE = 5,

  OPTIMIZATION_GUIDE_PREDICTION_MODELS = 6,

  BRUSCHETTA = 7,

  // New clients should be added above here.
  BOUNDARY = 8,
};

// Get a string that represents a particular client. Used in histograms and
// debugging web UI. Must never change existing value and sync value with
// variants "DownloadClient" in histograms.xml.
COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE)
std::string BackgroundDownloadClientToString(DownloadClient client);

using DownloadClientMap = std::map<DownloadClient, std::unique_ptr<Client>>;

}  // namespace download

#endif  // COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_CLIENTS_H_