4/9/2023 0 Comments Magic launcher 1.0.0![]() Provides the mechanisms to import and export services through a set of configuration types. Mapping between services and endpoints as well as their communication characteristics. To understand the above picture and the following blog post better, here is a short glossary for the used terms:īasic specification to describe how OSGi services can be exported and imported to be available across network boundaries.Įxports services by creating endpoints on the producer side, imports services by creating proxies to access endpoints on the consumer side, manages policies around the topology and discovers remote services.Ĭommunication access mechanism to a remote service that requires some protocol for communications. For OSGi Remote Services the above picture could be extended to look like the following: Glossary The difference is that the services are registered and consumed across network boundaries. With OSGi Remote Services this picture is basically the same. In short, the OSGi Service Layer specifies a Service Producer that publishes a service, and a Service Consumer that listens and retrieves a service. If you are not familiar with OSGi DS, you can get an introduction by reading my blog post Getting Started with OSGi Declarative Services. ![]() To understand this blog post you should be familiar with OSGi services and ideally with OSGi Declarative Services. In the deployment the lightweight communication will be added to support service communication over a network.Īnd as initially mentioned, I want to have a look at ways how to probably get rid of the networking issues I faced in the presentations in the past. You develop the service and the service consumer as if they would be executed in the same runtime. And this is where OSGi Remote Services come in. Well, it is always good that everybody in a project knows about everything, but the idea is to not making your code dependent on infrastructure. Ideally the developer of the service as well as the developer of the service consumer should not need to think about the infrastructure of the whole application. the JAX-RS wrapper to access the service via REST) and you need to implement the service access on the consumer side by using a corresponding framework to execute the REST calls. But it means that you need to implement the access layer on the provider side (e.g. For inhomogeneous environments the usage of those specifications is a good match. This satisfies the aspect of a communication between services via lightweight mechanisms. The services in those small independent deployments can then be accessed in different ways, like using the HTTP Whiteboard or JAX-RS Whiteboard. Those modules can then be integrated into small runtimes and deployed in different environments (despite the needed JVM or a database if needed). Via the service registry and the service dynamics you can build up very small modules. While new frameworks and tools came up over the years, the OSGi specification(s) covers these topics for a long time. communicating with a lightweight mechanism, e.g.Per definition the idea of a microservices architecture is to have Looking at general software architecture discussions in the past, service oriented architectures and microservices are a huge topic. Motivationįirst I want to explain the motivation for having a closer look at OSGi Remote Services. That said, let’s start with OSGi Remote Services. And with this blog post I finally want to keep my promise. I promised to write a blog post about that topic as a favour for all the support. Scott Lewis, the project lead of the Eclipse Communication Framework, was really helpful whenever I encountered issues with Remote Services. In the last years I published several blog posts and gave several talks related to OSGi, and often the topic OSGi Remote Services was raised, but never really covered in detail. Of course I mentioned OSGi Remote Services there, and of course the demonstration failed again because of networking issues. At the EclipseCon Europe 2018 I gave a talk on how to use different OSGi specifications for connecting services remotely titled How to connect your OSGi application. In that talk we focused on OSGi Remote Services, but we again failed with the demo at the end because of networking issues. The next year at the EclipseCon Europe 2017 we joined forces again and gave a talk with the name Microservices with OSGi. It actually did not really happen because of the lack of time and networking issues. The final exercise should have been the demonstration of OSGi Remote Services. At the EclipseCon Europe 2016 I held a tutorial together with Peter Kirschner named Building Nano Services with OSGi Declarative Services.
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