This allows container images to be much smaller than vm images, and faster because they can use the operating systems normal system call interface, without any extra virtualization layer. Developing serviceoriented architecture applications with osgi dr mark little, kevin conner red hat, keith babo. Understanding how osgi framework works is useful for developing eclipse plugins and many other molecularity applications. Developing serviceoriented architecture applications with osgi dr mark little, kevin conner red hat, keith babo sun, alexandre alves bea. Osgi infrastructure configuration appdynamics documentation. Architecture and deployment topologies for aem forms. Classes that are not specified in the container s classpath are not delegated to the bootstrap classloader. There may be few features vendor specific but most of the implementation as per osgi specification. Modularizing existing web applications with osgi dzone. Basic services provided by aem to a deployed application.
Container instances share the underlying operating system kernel and provide an isolated environment for their target application. The apache cxf distributed osgi subproject provides cxf based distribution providers for aries remote service admin rsa. Osgi specifications are defined and maintained by the osgi alliance, an open. Adobe experience manager aem is developed using frameworks such as osgi and apache sling. Osgi in liferay 7 dxp is a new concept introduced in liferay 7, the main intention behind osgi is to split the liferay 7 portal modules independent of each other. This paper presents a mobileagent and osgi based threetier control system architecture for smart home. This tutorial creates successively more complex osgi bundles to illustrate most of the features and functionality offered by the osgi framework. The architecture for aem forms includes the following components. The standardized osgi component architecture simplifies this. An introduction to osgi architecture tutorial developer. The osgi alliance has a compliance program that is open to members only. A purely local transaction control service implementation. Osgi framework architecture three conceptual layers. Before that, there are probably better ways to spend your time.
Forms manager is designed to provide a single view for managing all forms in any deployment. If we step into the osgi world for a moment, you may wonder what this means for the bundle cache. Apache karaf uses either the apache felix or eclipse equinox osgi frameworks, providing additional features on top of the framework. Osgi the sling application is built as a series of osgi bundles and makes heavy use of a number of osgi core and compendium services. Its the name the osgi container uses to refer to the bundle.
The aem forms addon package contains both services api providers, which are deployed into the aem osgi container, and servlets or jsps providing both frontend and rest api functionality managed by the aem sling framework. A problem you could solve using docker would be something like having multiple java. Osgi service bundle cohesive service boundaries and evolution mechanisms in the service contracts osgi versioning often its only documentation and discipline that prevents clients breaking a components encapsulation, leading to overlytight coupling between components. Generally the bundle cache is stored on the file system. Im assuming were talking strictly about jvm based applications, so the rest of my answer comes from that point of view. The osgi framework is becoming increasingly popular. This is no problem for a stateless architecture, as long as you dont use the bundle storage for storing application state. Offer and consume soap as well as rest based services. By default, apache karaf runs with the apache felix framework, but you can easily switch to equinox just change one property in a configuration file.
Before it walks you through eighteen patterns that will help you architect modular software, it lays a solid foundation that shows you why modularity is a critical weapon in your arsenal of design tools. Osgi and docker, a perfect team paul about software. Building linkedins next generation architecture with osgi. It provides great mechanisms for developing modular and dynamic applications. Osgi services design process using model driven architecture. But what i really meant to question is whether osgi will have the disruptive impact of which its capable. Both implementations are followed the osgi standard specification. Module layer defines osgi module concept bundle, which is a.
If you have any questions concerning the specification, please use the osgi developer forum. Also considering the focus that was introduced, osgi have architecture that radiantly solves the. Osgi container eba osgi application eba osgi application eba osgi application bundle bundle bundle bundle bundle bundle bundle composite bundle was internal bundle repository bundle bundle bundle composite bundle composite bundle how it all fits together bundles can exist in several places in an osgi container. Building osgi applications with the blueprint container. For osgi based component development its more important to focus on the components than on the components framework. Developing serviceoriented architecture applications with. Microservices is an architecture style, in which a single application is composed of small independent processes that use lightweight communications and languageagnostic apis. The open services gateway initiative osgi defines an architecture for developing and deploying modular applications and libraries. Pdf modularity and lifecycle of osgi applications researchgate. You are looking for some examples to learn how to implement bundle for apache karaf.
Introduction to osgi and modularity infosphere mdm, version 11. Pdf an osgi and agent based control system architecture. In this article, learn how the blueprint container provides a simple programming model for creating dynamic applications in the osgi environment. Declarative services is very good but its not the only solution 6. A usable semantic osgi architecture within the smart home environment. Osgi container osgi service registry bundle a bundle b bundle c serviceregistrywrapper indexpostprocessorwrapper liferay custom bundle registration utility service tracker hot deploy listeners module deploy folder innovsquare eclipsecon europe 2015 liferay service registry liferay service tracker liferay cores services. The main contribution of this paper is the establishment of a middleware solution incorporating osgi into android software development platform, which provides a service architecture for androidbased applications. This section describes the rolebased access control rbac feature, which is enabled by default in the jboss amq container. The following is a short list of highlights of sling. For more advanced usage, you have the option of customizing the access control lists, in order to. Cargotecture turning containers into living spaces the. There is some usefull examples include in the source code, you can also browse and view documentation on the github of the projet.
As we have seen, sling may be launched as a standalone java application or as a web application inside any compliant servlet container. Originally intended to bring java into embedded systems. Cargotecture gets its name from the practice of creating buildings out of steel intermodal shipping containers, which it helped to pioneer. Osgi problems osgi is quite low level but there is some work to hide the complexity spring dm spring dynamic module multiple vendors containers spring dm server, glass. Hands on osgi finding open source implementations the osgi framework is one of those technologies that appear to be extremely intricate and complex until you actually try them out. These include a jcrcompliant content repository, an osgi service container, a workflow engine, and so on. This article explores how you can build on an existing webapp. The osgi core specification delivers an open, common architecture for service providers.
Classes that are not specified in the containers classpath are not delegated to the bootstrap classloader. A scalable architecture for distributed osgi in the cloud. The osgi service platform specification defines an open common architecture for. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. Apache karaf can be scaled from a very lightweight container to a fully featured enterprise service. These services include a jcrcompliant content repository, an osgi service container, a workflow engine, a trust store, a key store, and so on. Osgi recently, i questioned whether osgi and modularity would succeed in penetrating the enterprise. Remember that your architecture must be prepared for containerisation first before you can really get the benefits of running in docker. Run extreme scale containers in an osgi environment without dynamic.
In this first article in a threepart introduction to osgi, sunil patil gets you started with osgi development concepts and shows you how to build a simple hello world application using the eclipse osgi container implementation, equinox. Structure of an osgi application with declarative services. Cargotecture also provides permitting services for projects in most jurisdictions. Midp container signed bundles declarative services. Aem forms is an application deployed into aem as an aem package.
Osgi in the enterprise 2 osgi is a disruptive technology that will transform how. The references to peopledao and logservice are expected to be provided by osgi container at runtime. Osgi transaction architecture red hat jboss fuse 6. You can immediately start taking advantage of the rbac feature, simply by adding one of the standard roles such as deployer or administrator to a users credentials. If you want to know more on osgi, it is not exactly the book youre looking for except that the examples are presented with osgi osgi in action is the reference. The osgi service platform has a layered architecture, and is designed to run on. Osgi technology is a set of specifications that define a dynamic component system for java. There is console and web based interface for the osgi container where you can start, install, remove services see the pdf. Lean microservices on osgi linux foundation events. Architecture details for aem forms and recommended topologies for new and existing aem customers and customers upgrading from livecycle es4 to aem forms. The following modules are available for use in osgi. Osgi defines a dynamic component that is written in java. May 24, 2017 docker and osgi solve different problems. The core osgi service platform has a layered architecture, and is designed to run on a variety of standard java profiles.
Jul 23, 2010 one nice thing about using osgi is that it is not an allornothing affair, you can use as much or as little of the model as you need. Pdf a scalable architecture for distributed osgi in the. Osgi iot expert group and osgi architecture may 2018 osgi services using services is a powerful way for bundles to collaborate services advertise their public interfaces this provides a typesafe way to identify what a service does services can be registered and unregistered dynamically clients can be noti. This common security infrastructure currently consists of a mechanism for making jaas realms or login modules available to all application bundles. Getting started with adobe experience manager and osgi bundles.
Once youre ready to move to a containerised world however, osgi makes it very easy to do so. Environment a container or framework that installs resources. Java application architecture is not only about isolated work, it is a complete and constant effort to guide teams. The core of the architecture is a jta transaction manager based on apache geronimo, which exposes various transaction interfaces as osgi services. The osgi service platform has a layered architecture, and is designed to run on various standard java profiles. These specifications enable a development model where an application is composed of several components which are packaged in bundles. Apache karaf is not tightly coupled to one osgi framework. In the osgi platform of home gateway, upnp technology and intelligent agent technology works together to achieve automation of devices discovery. To hide the differences of the launching mechanism, sling internally registers a servlet with an osgi.
Cargotecture creates both sitebuilt and factorybuilt designs and completed projects. To enable some of the capabilities, it replicates forms and images from the adobe livecycle repository to a content repository, which is embedded in the livecycle container. Osgi specification implemented by several vendors popular vendors equinox and apache felix. A quick and practical introduction to osgi a javabased component system. Some platforms are introduced to implement the components in soa concept such as service component architecture. As of november 2010, there are seven certified osgi framework implementations. These specifications enable a development model where dynamic applications comprise of reusable components.
Creating, executing, and managing bundles in an osgi container. Publishing restful endpoints from an osgi container is possible right now package you annotated java classes in a bundle and implement a suitable activator to start endpoint consuming restful services from an osgi container is less straight forward you can always consume them manually with. Osgi is a core framework in our esb implementation. What are the advantages of using osgi over docker containers. Osgi is not the first component system but it is the first with wide range of followers osgi s original target market home gateways never where of any relevance but the strict constraints of them forced the development of a technology of widespread usage. Osgi and docker, a perfect team paul about software development. An xacapable transaction control service implementation based on the geronimo transaction manager. The diagram below describe the overview of each layer. Java application architecture lays the foundation youll need to incorporate modular design thinking into your development initiatives. Once called the open services gateway initiative, the osgi alliance now refers to the framework specification as osgi or the osgi service platform. We can develop osgi application which target to anyone of these implementations. A separate page lists both certified and noncertified osgi specification implementations, which include osgi frameworks and other osgi specifications. These services are available to aem forms application but they are not provided by aem forms.
For declarative services cxf dosgi is the easiest way to interact with such services. Service component architecture sca 1 is a set of specifications which describe. Programming with equinox the osgi foundation for eclipse jeff mcaffer, ibm rational tom watson, ibm lotus. You can start websphere extreme scale servers and clients in an osgi container. Design, implementation and validation 2010 by pablo cabezas, jon legarda, jose maria sarriegi osgi service platform enterprise specification. Along with gofs design patterns, kirk knoernschilds java application architecture is a mustown for every enterprise developer and architect and on the required reading list for all paremus engineers. Description java application architecture lays the foundation youll need to incorporate modular design thinking into your development initiatives. This can be used with any resourcelocal capable resourceprovider. I am gonna introduce you to some of the basic concepts of osgi such osgi modules, osgi components and osgi services.
Richard nicholson, paremus ceo, president of the osgi alliance in writing this book, kirk has done the software community a. Osgi introduces the notion of a bundle as a modular unit, and the platform architecture is based upon bundles as the unit of deployment. The right hand part of figure 3 shows an osgi container which hosts a sca. Components communicate locally and across the network through services an application in this context represents the functionality desired by the organization.