Building Modular Cloud Apps with OSGi Practical Modularity with Java in the Cloud Age 21109

If you're an experienced Java developer in the enterprise, this practical, hands-on book shows you how to use OSGi to design, develop, and deploy modular cloud applications. You'll quickly learn how to use OSGi, through concise code examples and a set of best practices derived from the authors' experiences with real-world projects. Through the course of this book, you'll learn to develop modern web applications with tools and techniques such as RESTful Web Services, NoSQL provisioning, elasticity, Auto Scaling, hotfixes, and automatic failover. Code samples are available from GitHub. Work with dynamic OSGi services to create modular applications Explore the basics of OSGi bundles and modular application design Learn advanced topics, including semantic versioning, integration testing, and components configuring Understand OSGi pitfalls, anti-patterns, and features you should avoid Create a modular architecture for cloud-based web applications Discover how maintainability, extensibility, scalability, and testability are affected by modular design Get a look at various options for creating web applications with a modular approach Interact with persistent storage services, including relational databases and NoSQL Examine alternatives for deploying modular applications to the cloud

Introducing Modularity in Java
Chapter 1 : Modularity Introduction
Dealing with Increasing Complexity complexity
Divide and Conquer
Service Oriented Architecture All Over Again?
A Better Look at Modularity and What It Really Means
Modularity Solutions
Choosing a Solution: OSGi
Tooling
Chapter 2 : Basic Concepts of OSGi
Hiding Implementations
Import Package Myths
Depending on Other Modules
Service Dynamics
The Bundle Format bundlesformat
Running an OSGi Application
The Framework Lifecycle
Chapter 3 : Creating the First OSGi Application
Prerequisites
Getting Started
Creating an API Bundle
Creating an OSGi Service
Running the Code
Using the Agenda Service
Service Instances
Understanding Service Dynamics
Chapter 4 : Advanced OSGi
Semantic Versioning
Integration Testing
Configuring Services Configuration Admin APIconfiguring services
Log Service
Extender Pattern
Event Admin
Aspect Services
The Bundle Cache
Chapter 5 : Pointers and Pitfalls
Better Understanding OSGi Specifications
Require Bundle
Fragment Bundles
Loading Extra System Packages
Profilers, Coverage Tools, and Bootpath Delegation
Dealing with Non-OSGi Libraries
Transitive Dependencies transitive dependencies
Classloading Problems in Libraries and Frameworks
The Low-Level Service API
Dynamic Classloading
Developing Cloud Applications
Chapter 6 : Cloud Application Architecture
Technology Stack
The Amdatu Project
The Layered Architecture
Inside a Bundle
API Bundles
Separation of Concerns
Services Are Responsible for Their Own Data
Bndtools Project Structure project structure
Comparing with SOA Again
Remoting
Chapter 7 : Architectural Capabilities system capabilities
Maintainability
Extensibility
Scalability scalability
Testability mocking
Chapter 8 : Creating Web Applications
Modular Web Applications
HTTP Service
Handling Web Resources Automatically X-Web-Resource-Version header
Rethinking Web Applications
RESTful Web Services
Modular User Interfaces Using HTML 5
Token Based Security
Web Application Bundles
OpenSocial
Chapter 9 : Persistence
Relational Databases
NoSQL
Deploying Applications in the Cloud
Chapter 10 : Deployment
Understanding OSGi Runtimes
Choosing an OSGi Framework for Deployment
IaaS versus PaaS versus SaaS
A Modular PaaS
Apache ACE provisioning
Creating a Deployment
Autoscaling
Chapter 11 : Alternative Deployment Methods
Packaging an Application as an Executable JAR
Application Servers Application Servers
Appendix : Example Application
Introduction
Finding and Running the Source Code
Layered View
Component View
Development View
Modularized Frontend
Authentication
Configuration Admin
Scheduled Jobs
Event Admin
Testing
Index
Colophon