Building Modular Cloud Apps With OSGi by Bakker, Paul -- Read -- Imperial Library of Trantor

Index

Building Modular Cloud Apps with OSGi Dedication Preface

Who Should Read This Book How This Book Is Organized Conventions Used in This Book Using Code Examples Safari® Books Online How to Contact Us Acknowledgments

I. Introducing Modularity in Java

1. Modularity Introduction

Dealing with Increasing Complexity Divide and Conquer Service Oriented Architecture All Over Again? A Better Look at Modularity and What It Really Means

Design Time Modularity Runtime Modularity

Modularity Solutions

OSGi Jigsaw JBoss Modules Maven

Choosing a Solution: OSGi

What Is OSGi? OSGi in the Real World

Tooling

Bndtools Maven with the BND Maven Plug-in Eclipse Tycho NetBeans and IntelliJ

2. Basic Concepts of OSGi

Hiding Implementations Import Package Myths Depending on Other Modules Service Dynamics The Bundle Format

Bundle-SymbolicName Bundle-Name Bundle-Version Import-Package Export-Package Bundle-Activator

Running an OSGi Application The Framework Lifecycle

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

Services and Bundle States Debugging Services Having Multiple Service Implementations Service Properties Service Ranking Service Registration and Deregistration Callbacks Injecting Multiple Service Implementations and the Whiteboard Pattern Lifecycle Callbacks Injecting BundleContext and DependencyManager

4. Advanced OSGi

Semantic Versioning

Provider and Consumer Types Baselining in Bndtools Semantic Bundle Versioning

Integration Testing

Writing Integration Tests Running Integration Tests

Configuring Services

Managed Services Configuring a Managed Service Required Configuration Managed Service Factories MetaType Providing Configuration

Log Service

Installing and Using the LogService Logging Performance

Extender Pattern Event Admin

Using Event Admin

Aspect Services The Bundle Cache

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 Classloading Problems in Libraries and Frameworks

Passing the Bundle Classloader Manually Handling Classpath Scanning

The Low-Level Service API

Registering Services Using Services Service Tracker

Dynamic Classloading

DynamicImport-Package Optional Import-Package

II. Developing Cloud Applications

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 Comparing with SOA Again Remoting

7. Architectural Capabilities

Maintainability Extensibility Scalability Testability

8. Creating Web Applications

Modular Web Applications HTTP Service

Taking It One Step Further with Servlets Adding Filters into the Mix

Handling Web Resources Automatically Rethinking Web Applications RESTful Web Services

Getting Started Implementing an Agenda Resource Extending the Agenda Resource Simplified Object Mapping Self-Documenting RESTful Endpoints Modularizing RESTful Resources

Modular User Interfaces Using HTML 5 Token Based Security

Using the Token Provider

Web Application Bundles OpenSocial

Getting Started Creating Gadgets

9. Persistence

Relational Databases

JDBC Object Relational Mapping with JPA

NoSQL

Document Stores Using MongoDB as a Document Store Getting Started Implementing a Persistent Service Using the MongoDB Query System Taking It Back to the Web

III. Deploying Applications in the Cloud

10. Deployment

Understanding OSGi Runtimes Choosing an OSGi Framework for Deployment IaaS versus PaaS versus SaaS A Modular PaaS Apache ACE

Installing Apache ACE Starting Deployment Targets

Creating a Deployment

Incremental Updates Deploying Configuration Parameterized Configuration Solving Deployment Issues Configuring the Apache ACE Launcher

Autoscaling

11. Alternative Deployment Methods

Packaging an Application as an Executable JAR Application Servers

Oracle GlassFish Application Server

Using Apache ACE to provision GlassFish Using the OSGi shell Interacting with GlassFish Java EE APIs EJB and JPA Web Application Bundles and JAX-RS GlassFish versus a plain OSGi container

RedHat JBoss Application Server IBM WebSphere® Application Server Apache Karaf Eclipse Virgo

A. 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 About the Authors Colophon Copyright

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