third_party/perfetto/ui/src/controller/index.ts

// Copyright (C) 2018 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import '../gen/all_tracks';
import '../common/recordingV2/target_factories';

import {assertExists, assertTrue} from '../base/logging';

import {AppController} from './app_controller';
import {ControllerAny} from './controller';

let rootController: ControllerAny;
let runningControllers = false;

export function initController(extensionPort: MessagePort) {
  assertTrue(rootController === undefined);
  rootController = new AppController(extensionPort);
}

export function runControllers() {
  if (runningControllers) throw new Error('Re-entrant call detected');

  // Run controllers locally until all state machines reach quiescence.
  let runAgain = true;
  for (let iter = 0; runAgain; iter++) {
    if (iter > 100) throw new Error('Controllers are stuck in a livelock');
    runningControllers = true;
    try {
      runAgain = assertExists(rootController).invoke();
    } finally {
      runningControllers = false;
    }
  }
}