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crazylion lee

BFH ImagePlay - Rapid Prototyping for Image Processing - 0 views

imageplay.io

processing image

shared by crazylion lee on 06 Aug 15 - No Cached
  • crazylion lee on 06 Aug 15
     
    "ImagePlay is a rapid prototyping tool for building and testing image processing algorithms. It comes with a variety of over 70 individual image processors which can be combined into complex process chains. ImagePlay is completely open source and can be built for Windows, Mac and Linux."
張 旭

The Rubyist's Guide to Environment Variables - Honeybadger.io Blog - 0 views

blog.honeybadger.io/by-guide-environment-variables

ruby environment development shell

shared by 張 旭 on 12 Jun 15 - No Cached
  • If you want to be able to effectively manage web apps in development and in production, you have to understand environment variables.
  • Every program you run on your server has at least one process. That process gets its own set of environment variables.
  • Once it has them, nothing outside of that process can change them.
  • ...9 more annotations...
  • Every program you run on your server gets its own set of environment variables at the moment you launch it.
  • Environment variables die with their process
  • Every process has a parent. That’s because every program has to be started by some other program.
  • Child processes inherit env vars from their parent
  • By default a child will get copies of every environment variable that its parent has. But the parent has control over this.
  • Changes to the environment don’t sync between running processes
  • shells do provide their own “local” shell variable systems
  • Environment variables are NOT the same as shell variables
  • use the export command to convert the local variable into an environment variable.
張 旭

MonolithFirst - 0 views

martinfowler.com/...MonolithFirst.html

system architecture deploy

shared by 張 旭 on 05 Jun 15 - No Cached
  • Microservices are a useful architecture, but even their advocates say that using them incurs a significant MicroservicePremium, which means they are only useful with more complex systems.
  • you should build a new application as a monolith initially, even if you think it's likely that it will benefit from a microservices architecture later on.
  • Any refactoring of functionality between services is much harder than it is in a monolith.
  • ...4 more annotations...
  • By building a monolith first, you can figure out what the right boundaries are, before a microservices design brushes a layer of treacle over them.
  • The logical way is to design a monolith carefully, paying attention to modularity within the software, both at the API boundaries and how the data is stored.
  • start with a monolith and gradually peel off microservices at the edges
  • Don't be afraid of building a monolith that you will discard, particularly if a monolith can get you to market quickly
張 旭

Docker Explained: Using Dockerfiles to Automate Building of Images | DigitalOcean - 0 views

www.digitalocean.com/...to-automate-building-of-images

docker tutorial

shared by 張 旭 on 01 Jun 15 - No Cached
  • CMD would be running an application upon creation of a container which is already installed using RUN (e.g. RUN apt-get install …) inside the image
  • ENTRYPOINT argument sets the concrete default application that is used every time a container is created using the image.
  • ENV command is used to set the environment variables (one or more).
  • ...6 more annotations...
  • EXPOSE command is used to associate a specified port to enable networking between the running process inside the container and the outside world
  • defines the base image to use to start the build process
  • Unlike CMD, it actually is used to build the image (forming another layer on top of the previous one which is committed).
  • VOLUME command is used to enable access from your container to a directory on the host machine
  • set where the command defined with CMD is to be executed
  • To detach yourself from the container, use the escape sequence CTRL+P followed by CTRL+Q
張 旭

Best practices for writing Dockerfiles - Docker Documentation - 0 views

docs.docker.com/...dockerfile_best-practices

docker tutorial deploy

shared by 張 旭 on 29 May 15 - No Cached
  • Run only one process per container
  • use current Official Repositories as the basis for your image
  • put long or complex RUN statements on multiple lines separated with backslashes.
  • ...16 more annotations...
  • CMD instruction should be used to run the software contained by your image, along with any arguments
  • CMD should be given an interactive shell (bash, python, perl, etc)
  • COPY them individually, rather than all at once
  • COPY is preferred
  • using ADD to fetch packages from remote URLs is strongly discouraged
  • always use COPY
  • The best use for ENTRYPOINT is to set the image's main command, allowing that image to be run as though it was that command (and then use CMD as the default flags).
  • the image name can double as a reference to the binary as shown in the command above
  • ENTRYPOINT instruction can also be used in combination with a helper script
  • The VOLUME instruction should be used to expose any database storage area, configuration storage, or files/folders created by your docker container.
  • use USER to change to a non-root user
  • avoid installing or using sudo
  • avoid switching USER back and forth frequently.
  • always use absolute paths for your WORKDIR
  • ONBUILD is only useful for images that are going to be built FROM a given image
  • The “onbuild” image will fail catastrophically if the new build's context is missing the resource being added.
tboydar

Swift 推播處理 (2) - 0 views

leoyeh.me/...8%E6%92%AD%E8%99%95%E7%90%86-2

swift push notification ios

shared by tboydar on 29 May 15 - No Cached
  • tboydar on 29 May 15
     
    基本介紹教學目標了解如何透過 Swift 程式語言搭配 Parse 雲端服務進行推播通知。 前置作業在 Parse 雲端服務中匯入推播通知服務的開發與產品 p12 憑證。 使用教學請開啟 Xcode 開發工具，接著新增 Single View Appliation 專案，再開啟 AppDelegate.swift 程式碼檔案進行推播通知服務實作。 推播通知註冊和接收 Parse 雲端服務程式碼。1
張 旭

#JavaScript：this用法整理 - 翼世界夢想領域 - 0 views

knightzone.org/?p=106

javascript this

shared by 張 旭 on 15 May 15 - No Cached
  • JavaScript裡的this看的是究竟是誰調用該函式，而不是看該函式被定義在哪個物件內
  • call與apply都是呼叫該函式並讓該函式的this指向給予call或apply的第一個參數。
  • call和apply的差別則是在於其後面給予被調用之函式的參數放入的方法不同
  • ...2 more annotations...
  • 為什麼常常別人實作的callback函式可讓this指向於調用放入該callback的函式之this所指向之物件呢？
  • 實作上會遵守一個規則，會將自己的this或是直觀上合理的物件傳給callback當作它的this來用！
張 旭

Break Deep Associations - 0 views

ingramchen.io/...break-deep-associations.html

database development test programming table architecture

shared by 張 旭 on 08 May 15 - No Cached
  • 常寫單元測試的開發者，多半已經養成遇到難測的元件時，就替該元件抽一個 interface 隔離
  • 部署的時候再藉由 Dependency Injection 注入真正的實作
  • 將它們隔離。這跟 class 抽 interface 其實很像的，都讓耦合下降，提高模組化
  • ...1 more annotation...
  • 如果測試很難寫，那八成設計有問題
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