Osgi lifecycle events. The alliance transferred its work to the .
Osgi lifecycle events. It is based on a event publish and subscribe model, popular in many message based systems. The main stages are: The bundle is deployed into the OSGi container, but its dependencies haven't been resolved yet. Nearly all the bundles in an OSGi framework must deal with events, either as an event publisher or as an event handler. Resolved: All dependencies of the bundle have been met, and it is ready to start. It also covers listening for bundle and framework events to get notifications as bundles transition Aug 17, 2009 · I would like to gain some insight into the life cycle that is used in industry when developing and deploying OSGi based systems. If the package-info. In fact services are so important that there’s an entire chapter of the OSGi specification dedicated to them. Technically, a bundle is just a jar file with a MANIFEST. Now you can understand all about the OSGI in AEM. 3. Your OSGi Component or non-component class can listen for these events by way of their ser Sep 27, 2022 · This chapter dives deep into OSGi concepts, along with its essential features, its architecture, services, the Service Registry, and a few other crucial topics that fall under the basics of OSGi concerning Liferay DXP. To monitor and interact with this system, AEM provides a powerful browser-based dashboard — the System Console. Your OSGi classes can listen for these service registrations to wait for the respective life cycle events before executing certain tasks. Solution: Implement the BundleActivator interface to manage the lifecycle of your RMI client. init () This is the first method A service lifecycle change event. BundleEvent objects are delivered to BundleListener objects when a change occurs in a bundle's lifecycle. OSGi provides a comprehensive model for creating modular applications in Java, enhancing code management, and fostering reusability. BundleEvent objects are delivered to SynchronousBundleListener s and BundleListener s when a change occurs in a bundle's lifecycle. At least Weld-OSGi provides numerous events about OSGi events and bean bundle lifecycle events. 2 Permission Management Model 50. It leverages the existing Java packaging support and uses only elements, concepts, and mechanisms present in this Java technology. -Ing. The OSGi platform provides a way to receive notifications about bundles becoming available The core part of the OSGi Service Platform defines a secure and managed service platform that is based on Java™. 4 org. 5 org. A service lifecycle change event. They provide a way to declare dependencies and interact with OSGi services. OSGI Complicating matters further The introduction of OSGI as a major and the preferred vehicle for providing Kettle Plugin types and capabilities in general brought even more challenges to managing Kettle’s initialization. Oct 12, 2025 · OSGi is a set of specifications. There are only two new possible states and they do not modify the behavior from OSGi side. Retrieving the Bundle Context is crucial for components that need to interact with the OSGi service registry, manage lifecycle events, and more. However, this model does not scale well for fine grained events that must be In the OSGi framework, the Bundle Context is a central interface that provides access to the runtime environment of a bundle. A type code is used to identify the event type for future extendability. A software component in OSGi is called bundle or plug-in, both terms are interchangeable. Overview Event lifecycle logging, also called trace logging, is used for creating highly detailed log files for describing the flow of events. It also allows decoupled bean bundle communication. OSGI is a Java framework for developing and deploying dynamic modular software applications. OSGI Bundle Lifecycle and Bundle Framework Event Nov 6, 2024 · 🚀 Welcome to Apache Karaf Essentials 🚀 In this video, Jamie Goodyear dives into the OSGi Lifecycle to help you understand the dynamic nature of Apache Karaf applications. The OSGi has a layered model. Sep 25, 2023 · Use Case: OSGi components are used when you want to define and manage the lifecycle of a specific bundle or module within an OSGi application. Mistake: Forgetting to use the correct class loader to find RMI classes. 10 ¶ 4. Dec 19, 2016 · OSGI Lifecycle Since Liferay has adopted OSGI standards it is necessary for us to know basic's of OSGI. The lifecycle layer defines bundle lifecycle operations and the BundleActivator interface for starting and stopping bundles. launch 10. Solution: Ensure that RMI classes are available to the OSGi container by properly configuring the bundle dependencies. So far, the preferred mechanism to disperse those events have been the service interface mechanism. May 19, 2022 · A Bundle object is the access point to define the lifecycle of an installed bundle. Services layer exposes services objects that can be called from other services running in the OSGi server. Popular implementations include Apache Felix, Eclipse Equinox, and Knopflerfish. MF file containing some OSGi-specific headers. The following list contains a short definition of the terms: Bundles – Bundles are normal jar components with extra manifest headers. See full list on eclipsesource. Collision Hook - A service used by the framework to filter colliding bundles during an install or update operation when the org. Aug 8, 2024 · This is all related to OSGI in AEM where we have discussed OSGI Configuration, Run Mode, Variable, and Implementation with examples. This specification addresses some of the complications that arise when the OSGi service model is used for larger systems and wider 10. Next Steps Explore advanced OSGi features such as Declarative Services and Event Admin Learn about OSGi REST services with Apache Felix Check out OSGi specifications for deeper understanding of its lifecycle Event Admin Service — Sling uses the OSGi EventAdmin service to dispatch events when scheduling tasks. This figure shows the two new states a bean bundle can be in. Bean bundles life cycle This section presents the lifecycle of a bean bundle and how it impacts CDI and OSGi regular behaviors. This platform supports the deployment of extensible and downloadable applications that are known as bundles. May 2, 2025 · Hi all, Is there any detailed source where I can understand the different states of the OSGi bundle lifecycle more clearly? Jul 19, 2014 · The document discusses OSGi bundle lifecycles and the lifecycle layer. bundle 50 Conditional Permission Admin Service Specification 50. At its heart, the OSGi service model has a simple purpose - its job is to allow modules to collaborate at runtime without violating encapsulation An event from the Framework describing a bundle lifecycle change. OSGI Bundle Lifecycle and Bundle Framework Event Waiting for Life Cycle Events Liferay registers life cycle events like portal and portlet initialization into the OSGi service registry. It The OSGi Service Layer defines a dynamic collaborative model that is highly integrated with the Life Cycle Layer. May 2, 2025 · Understanding the OSGi bundle lifecycle is crucial to knowing how OSGi components operate. OSGi is an open specification and open source project under the Eclipse Foundation. 3 Effective An event from the Framework describing a bundle lifecycle change. Mostly bean bundles follow the same lifecycle than a regular bundle. Starting an OSGi bundle involves several distinct steps that include setting up the OSGi environment, deploying your bundle, and managing its lifecycle. Services – The service layer, which hold the service-side of the framework, keeps the service registry and manages it. Bundle Event - An event that signals a life cycle operation on a bundle Monitoring bundle lifecycle events is a form of dynamic extensibility available in the OSGi framework based on the dynamically changing installed set of bundles (also known as the extender pattern). @Reference annotations are going to be ignored in non-components, and in fact they are also ignored in subclasses too. event which defines the events that OSGi application contexts can send during their lifecycle. In this section, we’ll describe what an OSGi component is and how to configure it, and we’ll introduce the concept of the OSGi container, which manages components based on a specific lifecycle. 1. These specifications enable a development model where an application is composed of several components which are packaged in bundles. 3 org. An event from the Framework describing a service lifecycle change. 1 Introduction 50. Which allows developers to start and stop each bundle separately. portlet have similar lifecycle as that of a servlet, portlet needs a portlet container similar to a servlet, we know that servlet have lifecycle of init (), service () and destroy () similarly liferay's lifecycle have the following stages. OSGI-stands for Open Services Gateway initiative. The alliance transferred its work to the The bundle life cycle management layer in OSGi enables bundles to be dynamically installed, started, stopped, and uninstalled, independently from the life cycle of the JVM. Feb 2, 2017 · @Reference is used to get OSGi to inject a component reference into your component. Life-cycle layer defines sequence of steps that the bundles should go through when installed, started, updated, stopped and uninstalled. Mar 7, 2013 · OSGi applications are described as living entities; by this we mean that these applications appear to evolve as the lifecycles of their constituent bundles are lived. Dispatching events for a design related to X, usually involves a service of type XListener. This specification assumes that the reader has at least one year of practical experience in writing Java programs. osgi. Dr. This means that bundles may be installed, started, updated, stopped, and uninstalled at any time during the running of the framework. May 13, 2024 · Adding a package-info. OSGI Bundle Lifecycle and Bundle Framework Event Architecture OSGi technology is a set of specifications that define a dynamic component system for Java. It allows bundles to be installed, started, stopped, updated, and uninstalled at runtime. Learn how to effectively run an OSGi framework within standard Java code, including setup, code examples, and common pitfalls. Liferay registers lifecycle events like portal and database initialization into the OSGi service registry. Declarative Services — One of the most important (beside the Log Service) services used by Sling is the Declarative Services Specification. 7 org. What kind of applications benefit from OSGi? Any application that is designed in a modular fashion where it is necessary to start, stop, update individual modules with minimal impact on other modules. An application in this context represents the functionality desired by the An event from the Framework describing a bundle lifecycle change. ServiceEvent objects are delivered to a ServiceListener objects when a change occurs in this service's lifecycle. namespace 10. These dependencies are dynamic in that their life cycle is independently controlled by other actors within the OSGi Framework and CCR must properly accommodate for this. Event Hook - A service used by the framework to filter Bundle Events before they are delivered to their listeners. OSGI Bundle Lifecycle and Bundle Framework Event Jan 7, 2016 · The OSGI Framework consists of three major parts:- Bundles, Lifecycle, and Services. framework. Mar 22, 2025 · An introduction to OSGi, a dynamic modular architecture for Java applications that is the basis for Adobe Experience Manager. versioning 10. Your OSGi Component or non-component class can listen for these events by way of their ser Liferay registers lifecycle events like portal and database initialization into the OSGi service registry. Michael Eichberg - Software Technology GroupOSGi Life Cycle Layer: Events Entities of the OSGi layer ‣ Events can be asynchronously delivered, unless otherwise stated, meaning that they are not necessarily delivered by the same thread that generated the event ‣ A bundle that calls a listener should not hold any Java monitors Neither the Framework nor the originator of a A Framework event describing a bundle lifecycle change. FrameworkEvent - Reports that the Framework is started, start level has changed, packages have been refreshed, or that an error has been encountered. Components communicate locally and across the network through services. Configuration Template - The static metadata describing a configuration object dependency. Starting/Active: The bundle is in the process of starting or is already actively Understanding this lifecycle is essential for controlling resource management, ensuring responsiveness, and enabling efficient collaboration between components. Exploring OSGi: Lifecycle Layer OSGi containers implement the lifecyle specification Three popular open source containers are Eclipse Equinox, Apache Felix and Knoplerfish The Lifecycle of an AEM Bundle AEM Bundles go through several stages in their lifecycle: Installed: The bundle has been installed into the OSGi container, but is not yet resolved. Lifecycle of a bundle OSGi is a dynamic platform. wiring 10. They get called when the component itself is activated, deactivated or modified and allow you to take appropriate action as a result. The foundation originally specified and maintained the OSGi standard. The Mar 22, 2025 · An introduction to OSGi, a dynamic modular architecture for Java applications that is the basis for Adobe Experience Manager. Each bundle installed in the OSGi environment must have an associated Bundle object. ServiceEvent objects are delivered to ServiceListener s and AllServiceListener s when a change occurs in this service's lifecycle. 2 org. Nov 29, 2023 · These events, stemming from the OSGi lifecycle, serve as essential triggers that can be harnessed to drive subsequent actions or workflows within the SAP Cloud Integration. 10. Reference Template - The static metadata describing a reference dependency. Further, you learn about bundles with a An event from the Framework describing a service lifecycle change. Bundle Context - A bundle's execution context within the Framework. Services are Java implementations that OSGi allows you to start and access. 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. The Framework passes this to a Bundle Activator when a bundle is started or stopped. Life-Cycle – The lifecycle layer manages and keeps track of the frameworks and bundles lifecycle state. Experience with embedded systems and server-environments is a plus. java is required to ensure other OSGi bundles in AEM can resolve the OSGi service interface (or any Java class). This model is elegant and powerful, it enables the building of applications out of bundles that communicate and collaborate using these services. Aug 25, 2018 · The @Activate, @Deactivate and @Modified annotations are used for lifecycle event notifications for the DS components. 1 Introduction The Life Cycle Layer provides an API to control the security and life cycle operations of bundles. Liferay registers life cycle events like portal and portlet initialization into the OSGi service registry. Additionally, it provides a comprehensive event API to allow a management bundle to control the operations of the OSGi framework. Logically, a bundle is a piece of functionality that has an independent lifecycle – which means it can be started, stopped and removed independently. The OSGi Framework contains a procedural service model which provides a publish/find/bind model for using services. springframework. 6 org. Dec 9, 2024 · The Life Cycle Layer in OSGi is responsible for managing the dynamic life cycle of bundles (OSGi modules). Eclipse plugins are represented by bundles, which conform to the OSGi (Open Services Gateway Initiative) specification, making OSGi lifecycle events fundamental to plugin behavior. May 13, 2016 · We would like to eventually have many more events such as: config, pre-init, init, post-init, ready, shutdown, destroy. The service model is a publish, find and bind model. The table below shows the possible states of an OSGi bundle and how these map to the plugin states. The specification defines a security model, an application lifecycle management model, a service registry, an Execution environment, and Modules. Services Probably the most important pattern in OSGi is the Service Pattern. It describes how bundles transition between states like installed, resolved, active, and stopped. com The Event Admin service provides an inter-bundle communication mechanism. The layer is based on the module and security layer. ¶ 4 Life Cycle Layer Version 1. This guide outlines the process in detail. Its core specification defines a component and service model for Java applications. What is Modularity? Sep 17, 2025 · In OSGi, a single component is called a bundle. The OSGi container, often referred to as the OSGi Framework, is the runtime environment that manages the lifecycle of bundles. annotation. May 2, 2025 · Hi all, Is there any detailed source where I can understand the different states of the OSGi bundle lifecycle more clearly? And other Apache projects OSGi Core Platform and Enterprise Expert Groups An event from the Framework describing a service lifecycle change. Application developers must be aware that the OSGi environment is significantly more dynamic than traditional desktop or server environments. Bundle Activator - An interface implemented by a class in a bundle that is used to start and stop that bundle. 8 org. OSGi CDI Components (hereafter referred to simple as components) - A set of closely related CDI beans having a common OSGi lifecycle. context. A Framework event describing a bundle lifecycle change. If you're an Apache An event from the Framework describing a service lifecycle change. The first state is Installed, The bundle is in Installed state right after it has been successfully deployed in the environment. ranking value on my custom event implementation, the earlier in the chain it was executed. OSGi bundles are dynamically installed, resolved, started, updated, stopped, and uninstalled. [2] It is a continuation of the work done by the OSGi Alliance (formerly known as the Open Services Gateway initiative), which was an open standards organization for software founded in March 1999. An application consists of different components and services. The lifecycle layer facilitates this functionality. In This Blog Lets see how a Portlet's Life cycle is managed by a portlet container from its initialization to destroy. OSGi also offers advanced security and lifecycle, which I'll explain in more detail further down. My main focus is on the deployment phases, after the development pha. 5 public static final String LIFECYCLE = "lifecycle" The action string lifecycle. This specification defines the details for the participants in this event model. BundleEvent - Reports changes in the life cycle of bundles. Learn about OSGi component lifecycle, including how to bind an OSGi service to the activate, modified and deactivate lifecycle events. May 14, 2017 · It seems the higher the service. OSGi reserves the right to extend the set of types. java is missing, the Java package and its Java interfances or classes are not exported. The Life Cycle Layer requires the Module Layer but the Security Layer is optional. OSGI specification defines the bundle lifecycle of 6 states from Installed to Uninstalled. A more extensive description of the Life Cycle layer can be found at Life Cycle Layer. These events, stemming from the OSGi lifecycle, serve as essential triggers that can be harnessed to drive subsequent actions or workflows within the SAP Cloud Integration. For these cases, Spring DM offers a dedicated package org. Mistake: Not handling OSGi lifecycle events properly. OSGi Alliance reserves the right to extend the set of types. A quick debug and code inspection session did indeed show that EventsProcessorUtil uses ServiceTrackers to retrieve all the registered implementations for a lifecycle event and gets back a sorted list. The OSGI Framework consists of three major parts:- Bundles, Lifecycle, and Services. 1. A CDI bundle has 1 to N components. bsnversion is set to managed. This is a key thing here, since OSGi is doing the injection, it is only going to work on an OSGi @Component class. Bundle - Represents an installed bundle in the Framework. System developers require a very deep understanding of Java. resource 10. Let’s look into those states in detail. All the bundle's dependencies are met, and it's ready to be started. May 13, 2024 · Learn about OSGi component lifecycle, including how to bind an OSGi service to the activate, modified and deactivate lifecycle events. startlevel 10. An event from the Framework describing a bundle lifecycle change. Your OSGi Component or non-component class can listen for these events by way of their ser Apr 7, 2025 · At the heart of AEM is OSGi, a dynamic Java module system, managed by Apache Felix. I am gonna introduce you to some of the basic concepts of OSGI such OSGi Modules, OSGi Components and OSGi Services. Patterns There are a number of patterns used in OSGi systems. zfvmkcz9 vq pon fkthy bjf l3wy 3umc enn9 pbcv 1rebg