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# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

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S3 Static Sites

What this will cover

• Host a static website at S3
• Redirect www.website.com to website.com
• Website can be an SPA (requiring all requests to return index.html)
• Free AWS SSL certs
• Deployment with CDN invalidation

Resources

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package com.chapters.training;


import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class HashMap<K , V> {

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// The following code is a series of test that were written in the order you'll read them. After
// each test was written it was run against the HashMap and the implementation was updated if it
// failed. The HashMap code is the final implementation that was built naively to pass each test.

// The Tests:

public class HashMapTest {
    private HashMap map;
  
    // Set up an empty map before each test  

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• Gecko Reflow Visualization
• css-stacking-contexts-wtf
• critical-rendering-path
• why-do-browsers-match-css-selectors-from-right-to-left
• getting-started-with-the-webkit-layout-code
• improving-css-performance-fixed-position-elements
• BlinkOn 5: Paint and Compositing Deep Dive
• a-quick-overview-of-chromes-rendering-path
• [render-blocking-css](https://developers.google.com/web/fundamentals/performance/critical-rendering-path/render-b

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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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Create-React-App with Sass configuration

Here are instructions for add Sass support to an app built with create-react-app. Hopefully this will be redundant when Sass support is built into the tool! Visit their form and let them know you need Sass support.

Install the create-react-app tool from npm. This will be installed globally. We also need to install the loaders needed for webpack, and we will save those as development dependencies.

npm install -g create-react-app

create-react-app your-app-name
cd your-app-name

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@mixin for-size($size) {
  @if $size == phone-only {
    @media (max-width: 599px) { @content; }
  } @else if $size == tablet-portrait-up {
    @media (min-width: 600px) { @content; }
  } @else if $size == tablet-landscape-up {
    @media (min-width: 900px) { @content; }
  } @else if $size == desktop-up {
    @media (min-width: 1200px) { @content; }
  } @else if $size == big-desktop-up {

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-server
-Xms2048m
-Xmx2048m
-XX:NewSize=512m
-XX:MaxNewSize=512m
-XX:PermSize=512m
-XX:MaxPermSize=512m
-XX:+UseParNewGC
-XX:ParallelGCThreads=4
-XX:MaxTenuringThreshold=1

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    public Observable<FilesWrapper> download(List<Thing> things) {
        
        return Observable.from(things)
                .flatMap(thing -> {
                    File file = new File(getExternalCacheDir() + File.separator + thing.getName());
                    if (file.exists()) {
                        return Observable.just(file);
                    }

                    Request request = new Request.Builder().url(thing.getUrl()).build();