Apache James/Hupa & GWT

Apache James:The Java Apache Mail Enterprise Server Hupa: The James WebMail client Manuel Carrasco Moñino manolo@apache.org @dodotis

About me● Apache James ● HUPA● GWT: ● Gquery & Gquery-plugins ● GwtExporter ● GwtUpload ● Chronoscope● Jenkins ● Performance plugin ● Emma plugin● Linux ● LXP a light and visual window manager based on icewm

Contents● Introduction to the James Project – Components – What is new in the release 3.0-beta3● Hupa – Architecture – What is GWT, MVP, How to Test – Hupa Status – Hupa Roadmap● Becoming an open-source contributor.

What is James?“The Apache James Project delivers a rich set of open source modules and libraries, written in Java, related to Internet mail communication which build into an advanced enterprise mail server”.

Server Components● Server is the main project in James and delivers a full featured modular mail-server composed by: – SMTP, LMTP – POP3 – IMAP4 (James-v3) – NNTP (James-v2) – Queue/Spool – Mail Storage – FetchMail

ProjectsJames is divided in projects, so as they can be used in other products easily:● Server: Enterprise mail server, it depends on other modules to be built.● Protocols: framework for mail protocols implementations (smtp, lmtp).● IMAP: flexible codec for IMAP and command processors .● MailBox: a library providing a flexible Mailbox storage accessible by mail protocols (Imap, pop, smtp), supports maildir, openjpa, hbase, jackrabbit.● Mime4J: parser for mime messages like javax.mail but more tolerant.● Mailets: email processing engine, it defines and implements a Mailet-API.● JSieve [*]: Java Framework implementation of the Sieve mail filtering language.● JSPF [*]: Java Sender Policy Framework implementation.● JDKIM [*]: Java Framework Implementation for DomainsKeys identification Mail.● MPT: Mail Protocol Tester (testing of ASCII based line protocols).● PostAge: application for generating mail traffic on mail servers.● HUPA: Hupa is an IMAP-based RIA Webmail written in GWT. [*] These frameworks provide mailet implementations to make easier to integrate with James Server

Advantages of using James● Pure java implementation.● Performance in mind.● Test based developing: TDD● Open-Source components.● Easy to Build (maven).● Easy to Install in any platform.● Easy to Use, Manage, and Integrate (APIs).● Easy email processing: Mailets and Matchers● Active developing and mailing lists.

Whats new in James-3beta● Imap● Mailboxes (maildir, hbase, openjpa, jcr)● More ddbb are supported (ie: Oracle)● Better logging● JMX management● Performance (Sockets, storage, etc)● NIO support (Using Netty)● Easy writing SMTP extensions, filters, etc.● NNTP not supported any more, it is left in v2 because it is not widely used.

HUPA(Pure Java RIA Mail Client)

Hupa Architecture Pure JavaScript Pure Java Any server (James, Gmail ...)

What is GWT Java to Javascript Compiler and OptimizerIt is a full SDK. Not a Js Framework Not a Js Library

Why a compiler? And why Java?● A high level language allows that the developer doesnt get lost with low level details (DOM, Ajax, Cross domain, Compression, Obfuscation, Dependencies ...)● Java syntax is closed to JS, so in theory the Java to Js compiler was easier to develop● Huge Java ecosystem: IDE, re-factoring, Debug, Code reuse, Maven, TDD, CI …● Patterns, MVP, RPC, Pojos …● Type checking, reduce errors.● Separate code maintenance from the effectiveness of the executable.● Normally the compiler would produce better js code that the code we could write by hand (less code, compressed, obfuscated, remove unused stuff, etc).

What does the SDK provide● Generators, Compiler, Linker, Optimizer, Obfuscater: one compiled js per browser (like c++ asm per processor).● Client side libraries: DOM, XML, JSON, RPC, RF, I18n, MVP, Widgets● Server libraries: RPC, RF● Eclipse plugin● Multi-browser Dev mode● Unit testing and Debug tools.● Performance tools (speed tracer)● Compiler Statistics● Everything is open sourced (Apache v2.0)

Java Code (IDE) Java Server Java Client Side SideToolkit (SDK) GWT development GWT compiler Debug/Hosted/Test Compiler/Optimizer GWT server JRE Emulation libs RPC/RF Libs & Widgets Test Runner FF/IE/Ch-Plugin 3ª Party 3ª Party Server libs Server libs JavaScript Bundles J-Byte Code (css, sprite) RPC/RF/JSON/XML RF/JSON/XML Other Backends JVM App-Server Browser (php, ruby, ...)

MVP: Model View Presenter ● Define the View Interface and decouple the Presenter so as it do not need any browser specific stuff. ● Testing of the view is not necessary since we use tested components (widgets) ● Fast developing using TDD and MockView run in JVM instead of browser using Gin and Guice for DI (minimize usage of GWTTestCase). ● EventBus facilitate decoupling of presenters. ● The Dispatcher (Command pattern) or RF simplifies the transport layer and data binding.

Hupa, Status● Time ago, Hupa was a reference of a GWT MVP application.● Hupa MVP design is based of a set of libraries available for gwt a couple of years ago: – Gwt-presenter: for the MVP and EventBus patterns – Gwt-dispatch: for the Command pattern – Gin + Guice: for dependency injection.● Hupa was developed before GWT-2.0 was released, when LayoutPanels, uibinders, Cells, etc. were not available.● Many of the libraries which Hupa are using are unmaintained or have an equivalent feature in modern GWT.

Hupa, RoadMap● Replace gwt-dispatch by RequestFactory● Replace gwt-presenter with the available stuff in GWT-2.4● Remove gwt-incubator dependency in favor of CellTable and CellTree● Use LayoutPanels instead of css workarounds● Use gwt-decorated panels● Use gQuery in client side to enhance and simply views● Implement new features: Contact management, Oauth, LocalStorage, Gadgets, etc.

Become an opensource contributor● Checkout the code.● Play with it, test it, find bugs.● Open JIRA tickets reporting problems, asking for improvements.● Attach patches which fix bugs, add new features, improve performance, contribute to readability, etc. Dont forget unit Tests.● Subscribe to mailing lists, and participate asking and answering questions.● Committers will appreciate your work and will propose you to be part of the team.● Other way you can utilize is to propose new projects: Apache incubator, labs, GSOC, etc. Find a mentor or use mailing-lists for that.

Apache James/Hupa & GWT

by Manuel Carrasco Moñino on Oct 08, 2011

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