Portlet Framework: the Liferay way
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The document discusses the Liferay portlet framework and its use of the Model-View-Controller (MVC) design pattern. It introduces Liferay's MVCPortlet class, which makes developing portlets easier by using a subset of the MVC framework with less configuration. The Service Builder is also discussed as a solution for sharing database access and business logic across independent portlets to avoid issues like stale caches from multiple writers or redundant database connections.
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This document describes a portlet for job management that allows submitting and tracking jobs on distributed computing infrastructures. It discusses the portlet lifecycle and interfaces, how it handles different modes like view, edit, and help. It also explains how the portlet exchanges parameters between Java and JSP pages using request attributes and parameters. Finally, it provides details of an example hostname portlet implementation, covering initialization, action/view handling, and job submission parameters.
Catania Science Gateway Framework
The document discusses the Catania Science Gateway Framework. It describes the framework's architecture, which uses Liferay for the user interface and authentication, integrates with grid and cloud resources using SAGA, and provides a job engine for submitting and monitoring jobs on different middleware. The framework aims to simplify access to remote resources for scientific users and support large-scale storage and sharing of data across multiple infrastructures in a transparent way through a virtual file system.
Web Applications Development
This document provides an overview of web application development using portlets. It introduces application servers, portlets, and the Liferay portal framework. Key points covered include the portlet lifecycle and interfaces, deploying portlets using tools like Ant and the Liferay Plugin SDK, and hosting portlets on an application server like Glassfish. The goal is to provide tutorial on developing portlets for science gateways.
Introduction on Science Gateway
This document summarizes a tutorial on science gateways. It outlines what science gateways are and describes their general architecture, including authentication, authorization, and roles. It also discusses two use cases - the DECIDE and GARR science gateways - and how they provide access
Science Gateways: one portal, many e-Infrastructures and related services
Riccardo Rotondo from the Consortium GARR presents on science gateways and the Catania Science Gateway Framework. The framework provides a single portal for users to access many e-infrastructures and related services through standards-based science gateways. It utilizes federated authentication, a job management system, modular e-infrastructure and data services, and cloud integration. The goal is to increase accessibility and reuse of applications across infrastructures. Training materials and an open source codebase are also provided to encourage community involvement.
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Portlet Framework: the Liferay way
- 1. Portlet Framework: the Liferay way Liferay Service Builder, Portlet MVC Catania, 10/03/2014Riccardo Rotondo
- 2. Outline Motivations ModelView Controller design pattern Liferay Service Builder 2
- 3. Portlet Framework GenericPortlet class is not the only way of developing portlet. Several framework are nowadays available to develop portlet: Struts JavaServer Faces Spring 3
- 4. Liferay MVCPortlet Make use of a subset of the classical MVC Framework Easier to use Faster learning curve Less configuration files to deal with and to synchronize with java sources MVC: ModelView Controller paradigm helps keeping the code tidy 4
- 5. Model View Controller Controller View Model 5 Model: layer responsible to hold the data and the business logic to manipulate them. In case you use Liferay Service Builder to manage your data, it works at the model layer level. View: layer containing the rules to display data to the users (typically the JSP pages) Controller: layer behaving as traffic director. Determine which action will be executed according users input. Model andView layer shouldn’t communicate each other but interact with the controller
- 6. Difference from the GenericPortlet Unnecessary implementation of doView() and doEdit() and any others porlet API Class is simpler, it contains just the action methods In case you really want to use any portlet API they are available, MVCPorlet is a subclass of the GenericPortlet class 6
- 7. Portlet accessing data Several reasons to use a database behind a portlet Java Programming offers different approach to deal with data Object-relation mapping framework allow database access in a robust way. Java offers Persistence API (JPA) for database access Liferay uses Hibernate to manage all its data 7
- 8. Drawback in Hibernate direct usage Development of independent portlets using Hibernate/JPA appears to work, but the runtime implications are not immediately recognizable: • Stale caches because of multiple writers. • Server resource consumption for multiple DB connections, memory usage for runtime copies of Hib/JPA objects. • Synchronization issues (two portlets given new Hib/JPA config but one forgotten). Source:8
- 9. The Service Builder Solution Service Builder provides a single point to share code (DB access and business logic) to independent portlets, resolving the caching, resource, and synchronization issues. Source:9
- 10. Service Builder Architecture Overview Source:10
- 11. References Liferay in Action: http://www.manning.com/sezov/ Liferay Service Builder: http://www.liferay.com/it/community/wiki/- /wiki/Main/Service+Builder https://www.liferay.com/c/document_library/get_file?p_l_id=8440 633&fileEntryId=22887097 11
- 12. Questions ? 12