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Ranga Rao Karanam authored and Ranga Rao Karanam committed Dec 15, 2017
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3 changes: 3 additions & 0 deletions jpa-in-10-steps/take-step-backup.sh
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echo '<!---' >> $1.md
echo Current Directory : $PWD >> $1.md
echo '-->' >> $1.md
java -cp /ProgrammingExcellence/Workspaces/Rithus.com/ListDirectoryContentInGitFormat/bin test.ListDirectoryContentInGitFormat $PWD >> $1.md
zip -r $1.zip . -x "target/*" -x ".mvn/*" -x ".settings/*" -x ".*" -x ".*/*" -x "**/.*" -x "*.md" -x "**/*.md" -x "**/mvn*" -x "*.zip" -x "**/*.zip" -x "/**/target/*" -x "/**/.mvn/*" -x "/**/.settings/*"
2 changes: 1 addition & 1 deletion mockito-in-5-steps/readme.md
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Expand Up @@ -5,7 +5,7 @@ Mockito is the most famous mocking framework in Java.
- Git Repository - https://github.com/in28minutes/getting-started-in-5-steps
- Pre-requisites
- Java & Eclipse - https://www.youtube.com/playlist?list=PLBBog2r6uMCSmMVTW_QmDLyASBvovyAO3
- JUnit - https://www.youtube.com/watch?v=AN4NCnc4eZg
- JUnit - https://courses.in28minutes.com/p/junit-tutorial-for-beginners
- Easier Static Imports
- Window > Preferences > Java > Editor > Content Assist > Favorites
- org.junit.Assert
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5 changes: 4 additions & 1 deletion presentations-reveal-js/.gitignore
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node_modules/
.sass-cache
css/reveal.min.css
js/reveal.min.js
js/reveal.min.js
target
*.jar
*.class
345 changes: 345 additions & 0 deletions presentations-reveal-js/17Nov2017-FissionLabs-Microservices-presentation.html
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<!doctype html>
<html lang="en">

<head>
<meta charset="utf-8">

<title>Microservices - in28Minutes</title>

<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">

<meta name="apple-mobile-web-app-capable" content="yes">
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<![endif]-->
</head>

<body>

<div class="reveal">

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<div class="slides">


<!-- Slides are separated by three dashes (quick 'n dirty regular expression) -->
<section data-markdown data-separator="---">
<script type="text/template">
# Microservices
---
# Ranga Rao Karanam
- Top Instructor on Udemy
- Author of "Mastering Spring 5.0"
---
# in28Minutes
- Create more great programmers
- Help you make the right career choices
---
![](images/Microservices-meme-3.jpg)
---
![](images/Microservices-meme-1.jpeg)
---
![](images/Microservices-meme-2.jpg)
---
# We love Buzzwords
---
# Microservices is the latest one!
---
# Microservices vs Monolith
- What are you doing today?
---
# Monolith
---
# Large
- Application Size
- Release Cycles
- Teams
---
# Scalability Challenges
---
# New Technology Adoption
---
# Agile?
---
# Automation Testing?
---
# Adapting to Modern Development Practices?
---
# Adapting to Device Explosion?
---
# Solution?
---
# Microservices
---
> Small autonomous services that work together - Sam Newman
---
> Developing a single application as a suite of small services each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API....contd
---
> These services are built around business capabilities and independently deployable by fully automated deployment machinery...contd
---
> There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies - James Lewis and Martin Fowler
---
## Microservices
- REST
- &amp; Small Well Chosen Deployable Units
- &amp; Cloud Enabled
---
# How does it look?
---
### Monolith
![](images/MonolithApplication.png)
---
![](images/MicroservicesArchitectureSplit.png)
---
![](images/Microservices-Chain-Example.png)
---
## Advantages?
---
## New Technology &amp; Process Adaption
---
## Faster Release Cycles
---
## Scaling
![](images/Microservices-Multiple-Instances.png)
---
# Let's get to Challenges!
---
# Quick Setup needed
---
# Automation
---
# Visibility
---
# Bounded Context
---
# Configuration Management
---
# Dynamic Scale Up and Scale Down
---
# Pack of Cards
---
# Debugging
---
# Consistency
---
# Solutions
---
# Spring Boot
---
> Enable building production ready applications quickly
---
### Provide non-functional features
- embedded servers
- metrics
- health checks
- externalized configuration
---
# DEMO
---
# Spring vs Spring MVC vs Spring Boot
---
# Key Features
---
# Auto Configuration
---
# Starter Projects
---
# Spring Cloud
---
## Dynamic Scale Up and Down
- Naming Server (Eureka)
- Ribbon (Client Side Load Balancing)
- Feign (Easier REST Clients)
---
## Visibility and Monitoring
- Zipkin Distributed Tracing
- Netflix API Gateway
---
## Configuration Management
- Spring Cloud Config Server
---
## Fault Tolerance
- Hystrix
---
![](images/MicroserviceCommunication.png)
> Microservices
---
## Currency Exchange Service
```
http://localhost:8000/currency-exchange/from/EUR/to/INR
```
```
{
id: 10002,
from: "EUR",
to: "INR",
conversionMultiple: 75,
port: 8000
}
```
---
## Currency Conversion Service
```
http://localhost:8100/currency-converter/from/USD/to/INR/quantity/10
```
```
{
id: 10001,
from: "USD",
to: "INR",
conversionMultiple: 65,
quantity: 10,
totalCalculatedAmount: 650,
port: 8000
}
```
---
![](images/CurrencyConversionMicroserviceDeployment.png)
> Currency Conversion Service
---
![](images/CurrencyExchangeMicroserviceDeployment.png)
> Currency Exchange Service
---
# How to provide Location Transparency?
---
![](images/EurekaNamingServer.png)
> Eureka Naming Server
---
# How to provide Dynamic Load Balancing?
---
![](images/RibbonClientSideLoadBalancing.png)
> Ribbon Load Balancing

```
http://localhost:8100/currency-converter-feign/from/EUR/to/INR/quantity/10000
```
---
![](images/ZipkinDistributedTracingServer.png)
> Zipkin Distributed Tracing
---
## API Gateways
- Authentication, authorization and security
- Rate Limits
- Fault Tolerance
- Service Aggregation
---
![](images/Microservices-Environments.png)
> Microservices Environments and Configuration
---
### Limits Service

```java
@Component
@ConfigurationProperties("limits-service")
public class Configuration {

private int minimum;
private int maximum;
```

```
@GetMapping("/limits")
public LimitConfiguration retrieveLimitsFromConfigurations() {
return new LimitConfiguration(configuration.getMaximum(),
configuration.getMinimum());
}
```
---
![](images/SpringCloudConfigServer.png)
> Spring Cloud Config Server
---
- Server Dependency - spring-cloud-config-server
- Client Dependencies - spring-cloud-starter-config

> Limits Service <--> Spring Config Server

---

bootstrap.properties
```
spring.application.name=limits-service
spring.cloud.config.uri=http://localhost:8888
spring.profiles.active=qa
```
> Limits Service <--> Spring Config Server

---
```java
@SpringBootApplication
@EnableHystrix
public class LimitsServiceApplication {
```

```java
@GetMapping("/fault-tolerance-example")
@HystrixCommand(fallbackMethod="fallbackRetrieveConfiguration")
public LimitConfiguration retrieveConfiguration() {
throw new RuntimeException("Not available");
}

public LimitConfiguration fallbackRetrieveConfiguration() {
return new LimitConfiguration(999, 9);
}
```
> Fault Tolerance with Hystrix
---
# Questions
---
</script>
</section>

</div>

</div>

<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>


<script>

// More info https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
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history: true,
center: true,

transition: 'slide', // none/fade/slide/convex/concave/zoom

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dependencies: [
{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
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</body>
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