src/performance/experimental/profiler/component.h

// Copyright 2023 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SRC_PERFORMANCE_EXPERIMENTAL_PROFILER_COMPONENT_H_
#define SRC_PERFORMANCE_EXPERIMENTAL_PROFILER_COMPONENT_H_

#include <fidl/fuchsia.component/cpp/fidl.h>
#include <fidl/fuchsia.sys2/cpp/fidl.h>
#include <lib/async/dispatcher.h>
#include <lib/zx/result.h>

#include <string>

#include "component_watcher.h"

namespace profiler {

class Component {
 public:
  explicit Component(async_dispatcher_t* dispatcher) : component_watcher_(dispatcher) {}
  // If on_start is specified, the callback will be called when it is successfully started via
  // `StartComponents`
  static zx::result<std::unique_ptr<Component>> Create(async_dispatcher_t* dispatcher,
                                                       const std::string& url,
                                                       const std::string& moniker);

  virtual zx::result<> Start(ComponentWatcher::ComponentEventHandler on_start = nullptr);
  virtual zx::result<> Stop();
  virtual zx::result<> Destroy();

  // Return the moniker the component was created at
  std::string Moniker() { return moniker_; }

  virtual ~Component();

 protected:
  // Recursively call f on each component in the realm specified by `moniker`
  static zx::result<> TraverseRealm(
      std::string moniker, const fit::function<zx::result<>(const std::string& moniker)>& f);
  static zx::result<fidl::Box<fuchsia_component_decl::Component>> GetResolvedDeclaration(
      const std::string& moniker);
  std::optional<ComponentWatcher::ComponentEventHandler> on_start_;
  std::string name_;
  std::string collection_;
  std::string parent_moniker_;
  std::string moniker_;
  std::string url_;
  std::vector<Component> children_;

  ComponentWatcher component_watcher_;
  bool needs_destruction_ = true;

 private:
  fidl::SyncClient<fuchsia_sys2::LifecycleController> lifecycle_controller_client_;
};

}  // namespace profiler

#endif  // SRC_PERFORMANCE_EXPERIMENTAL_PROFILER_COMPONENT_H_