Client/server
Per region servers
Login/authentication server
Lobby server
Store server

• buy champion/runes
  Transfer player from lobby to game server
• champion selection
• spectators
  Per game server
• Coordinates all 10 players within the game
• controls game events dragon/baron/npc/player gold
• compute damage
• end game lobby
  Game client
• Display animations
• play game state according to server

It's highly common when working that priorities shift and that sometimes you have way more on your plate than you can handle.

No need to panic!

• Ignore your task list
• Use your brain and create a fresh list of what you think is the most important
• Prioritize using the importance/urgency matrix

Context

Checklists are a highly effective way to make sure that critical elements of a routine are done. As such, I want to explore and make checklists for different things that are important in my life.

Life

• [ ] Did I eat 3 meals today?
• [ ] Are time-based events scheduled in the calendar?
• [ ] Are repetitive events scheduled in the calendar?

Software development

• [ ] Is the feature implementing all the desired use cases?
• [ ] Are tests written to cover the common case and some edge cases?
• [ ] Are tests passing?

Machine learning

• [ ] Is there a row of data even when the value is 0?

See also

References

• https://www.goodreads.com/book/show/6667514-the-checklist-manifesto

2018-05-26

• Read package.json to discover what packages VS Code depends on
• Observe the root directory structure, and more specifically the extensions and src directories which contain the bulk of the source code
  • A lot of the code in the extensions directory appears to be dedicated to programming language support
    • The remainder of the extensions seem to provide functionality for things that aren't "core" to vscode, such as configuration-editing, emmet, extension-editing and some color themes
• If you look at the .vscode/launch.json, you will find all the tasks that can be executed from within VS Code debugger. One task of interest is Launch VS Code which will take care of launching VS Code for us so that we may debug it
  • In this file you will also discover that it runs ${workspaceFolder}/scripts/code.bat, which is the next script we'll take a look at
• In ./scripts/code.bat, we discover that this script will run yarn if the node_modules directory is missing, download the electron binaries if necessary and call gulp compile if the out directory is missing, then finally start the electron/vs code binary in the .build/electron directory
• We then start to look for common entry points file such as index.ts/js or main.ts/js, for which we find a match in the src directory
• We take a quick look around, trying to find where electron is likely to be instantiated... There's a lot of code in src/main.js that would be better elsewhere to make it easier to navigate this file
• Close to the bottom of the file we discover the code we are interested in as a call to app.once('ready', ...)
  • Once the app is ready, we want to call src/bootstrap-amd and pass vs/code/electron-main/main as our entry point (per the signature of the exported function in ./src/bootstrap-amd)
    • Here we can go to two places, either src/bootstrap-amd or src/vs/code/electron-main/main
      • We take a quick peek at both files and we can quickly tell that src/bootstrap-amd is used mainly to load src/vs/code/electron-main/main which is the file we're going to be interested in
• Once again, we quickly look around src/vs/code/electron-main/main and find that the main logic is at the bottom of the file
• First the command line arguments are parsed
• Then services are bootstrapped/instantiated
• Finally the CodeApplication is started up
• This leads us to look into src/vs/code/electron-main/app.ts
• As the file is quite large, we start by skimming through it, looking at the available methods on the CodeApplication class as well as its properties
• Looking at the constructor, we can see that a lot of objects are given to it. We also observe the use of the @... syntax (those are decorators)
  • In this case (and for most constructors), this is how VS Code does service (dependencies) injection

• One will also notice that most, if not all parameters have a visibility assigned to it. What this does is that it will create an associated property in the class as well as assigning the parameter value to this property in the constructor. Thus, instead of writing

  
  class AnotherClass {
  private someClass: SomeClass;
  
  constructor(someClass: SomeClass) {
      this.someClass = someClass;
  }
  }
  

  you simply write

  
  class AnotherClass {
  constructor(private someClass: SomeClass) {
  }
  }
  

• Upon its creation, the CodeApplication class will register various event listeners on the electron app object
• If we remember, in src/vs/code/electron-main/main, after the CodeApplication object is instantiated, we call startup() on it. So, we want to take a look at what that method does
• Without knowing too much about the VS Code source, it appears that we are instantiating an IPC server (inter-process communication) and then the shared process
• After that is done, we initialize some more services in CodeApplication::initServices, such as the update service (which I guess takes care of checking for VS Code updates) and the telemetry (data about VS Code feature usage)
• We finally get to the point where we're about to open a window in CodeApplication::openFirstWindow!
  • This leads us to go read the class WindowsManager in src/vs/code/electron-main/windows.ts. Once again, this file is pretty large, so we want to skim it to see what it contains (functions, classes, properties, methods)
• There are a few large classes in src/vs/code/electron-main/windows.ts that I'd want to extract to make the file smaller and simpler (less cognitive load). However, the issue is that those classes are not declared as exported, and thus are only available in the local file. It would be possible to move these classes to other files and import them, but by doing so it would also "communicate" that others can use it, which is what having the classes as not exported prevents, at the cost of making single files larger and harder to comprehend
• We know that the constructor is first called, then from CodeApplication::openFirstWindow, we see that WindowsManager::ready and WindowsManager::open are both called.
  • In the constructor we instantiate the Dialogs class (takes care of open/save dialog windows) and the WorkspacesManager class (takes care of workspace management, such as open/save)
  • In ready event listeners are registered
  • In open there is a lot of logic associated with the window finally opening

Notes

• If you start VS Code using the debug feature, you will not be able to open the Chrome DevTools (at this moment, 2018-05-26) because only 1 process is allowed to attach to the Chrome DevTools instance, and that process is the VS Code editor that started the debugged VS Code instance

2018-07-08

Today I want to find out how VS Code restores a windows sessions when you start it. Apparently, if you run it as code ., it will not restore the same set of windows than if you called it simply with code.

• In src/vs/code/electron-main/launch.ts, the LaunchService::startOpenWindow appears to implement logic based on how many arguments were given. In all cases, we end up doing a call to the IWindowsMainService::open method.
  • Note that in both cases, the path we're opening is within the args variable, which is passed to the cli property of the IOpenConfiguration object.
• The implementation of IWindowsMainService we are interested in lives in src/vs/code/electron-main/windows.ts.
• In the WindowsManager::open method, we rapidly discover that the windows that will be opened will be retrieved in WindowsManager::getPathsToOpen. In there, we can observe that the windows that will be opened depend on whether something was passed from the API, we forced an empty window, we're extracting paths from the cli or we should restore from the previous session.
  • If we arrive at this last case, we can see that the logic is to call WindowsManager::doGetWindowsFromLastSession, which is pretty self-explanatory, and will retrieve the previous set of windows from the last session. This is what happens when you start code using code
  • In the case where we pass a path, this path is in openConfig.cli._. In this case, the windows that were previously opened, and part of this.windowsState.openedWindows (where this is a WindowsManager object)
    • Here we wonder how the windowsState.openedWindows state gets restored on VS Code start. To figure that out, we start at the WindowsManager.constructor method. There we find this.windowsState = this.stateService.getItem<IWindowsState>(WindowsManager.windowsStateStorageKey) || { openedWindows: [] };, which states to use get a IWindowState object from the stateService if one exists or to create an object with no opened windows. If we assume that this windows state is the same regardless of how we start VS Code, then it is not there that the difference in opened windows will occur.

Task duration vs appetite

• If you are building a product, it is your responsibility to define how much time you're willing to bet/spend on a feature, this is called the appetite
• Unlike a task duration estimate, an appetite is a fixed amount of time that is defined in order to define the boundaries of what the feature to develop should be vs an estimate which means that the task should be completed and we expect it to take X amount of time (variable)
• The appetite helps set the amount of time before a task is deemed without a proper scope

Do

• Record initial task duration estimate
• Record task duration after its completion

Estimating duration

• Make a high-level, gut feeling estimate of the duration of the whole project
• Lowest (fastest, optimistic), average (most likely), and highest (slowest, pessimistic) time duration estimates
  • A final value is computed by taking (lowest + 4*average + highest)/6
  • List the reasons why you think things may go right/wrong
• Heuristic estimation
  • At a high level, you should be able to tell how much each portion of a project should have over the complete project
• Use historical data
  • If you have underestimated in the past, you will keep underestimating if you do not adjust
• Break down any item that is larger than 10% of the project into smaller items

Factors

• Duration will depend on the skills of the person completing the task. An expert will generally take less time than a novice to accomplish the same task

Tracking duration

Issues

• Being interrupted while working (difficulty tracking beginning and ending)
• Working on unrelated things at the same time (diluted productivity)
• Working on multiple tasks at the same time (task overlapping)
• Determining what is and what isn't part of a task (task isolation)
• Changes in task definition
• Estimating tasks for which we have no experience

Task duration tool

Requirements

• Easy to start/stop tracking a task (less than 15 seconds, otherwise it feels like an interruption)

References

• https://en.wikipedia.org/wiki/Program_evaluation_and_review_technique
• https://rclayton.silvrback.com/software-estimation-is-a-losing-game
• https://en.wikipedia.org/wiki/Software_development_effort_estimation
• https://en.wikipedia.org/wiki/Work_breakdown_structure