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As we rewrite the UI, we have a one-time opportunity to pick a new web framework All options are on the table Criteria  Plug in our existing Java API.

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Presentation on theme: "As we rewrite the UI, we have a one-time opportunity to pick a new web framework All options are on the table Criteria  Plug in our existing Java API."— Presentation transcript:


2 As we rewrite the UI, we have a one-time opportunity to pick a new web framework All options are on the table Criteria  Plug in our existing Java API  Support extensions via modules  Allow us to build reusable components  Easy! Fun! Beautiful!  Accessible to entry-level coders  Well-supported

3 Spring 3 Spring MVC + JQuery + roll-our-own widgets Spring MVC + JQuery + StringTemplate JSF + ICEFaces Ruby on Rails (via JRuby) JQuery Grails YUI JQuery GXT

4  “the leading platform to build and run enterprise Java applications. Led and sustained by SpringSource, Spring delivers significant benefits for many projects, increasing development productivity and runtime performance while improving test coverage and application quality”  Why? ◦ We use it, we like it ◦ Extremely flexible ◦ Heavily used, and getting better all the time

5  frameworks/spring3mvc+jquery frameworks/spring3mvc+jquery ◦ Thanks Harsha!  The modern version of what we're doing now  Maven! Jetty!  Spring 3 MVC has lots of timesaving features we haven’t taken advantage of  Jquery is powerful and we haven't taken advantage  Consciously build reusable UI widgets

6 @Controller public class PatientController method=RequestMethod.GET) public String Patient patient, Model model) { model.addAttribute(patient); if (patient != null) model.addAttribute("encounters", Context.getEncounterService().getEncountersByPatient(patient)); } $(function() { $('#tabs').tabs(); });... Patient Encounters... Patient Encounters ... $(document).ready(function() { $('#encounters').dataTable(); }); Encounter Id Encounter Date Encounter Patient ${encounter.encounterId} ${encounter.encounterDatetime} ${encounter.patientId}

7  Pros: ◦ Flexibility (never “not be able to do” something) ◦ Strong community ◦ Configured right, it allows RAD ◦ No learning curve for existing devs  Cons: ◦ Significant learning curve for newbies (lots of technologies, and they are not simplified)  Open questions: ◦ Can we leverage Hibernate annotations?

8  ◦ -Thanks Thoughtworks!  “[StringTemplate's] distinguishing characteristic is that it strictly enforces model-view separation unlike other engines. Strict separation makes websites and code generators more flexible and maintainable.”  Controllers like you're used  StringTemplate instead of JSP  Recommended by Thoughtworks developers  Templates allow for page layouts and reusable components

9 layout/ Patient Dashboard $partials/header()$ $body$ $partials/footer()$ Patient Encounters $menuext:{item| $item$ }$... $widgets/encounters(encounters=patient.encounters)$... widgets/ $if(encounters)$ jQuery(function() { jQuery('#encounters').dataTable(); }); Date Location Type Provider $encounters:{ encounter | $encounter.encounterDatetime$ $$ $$ $encounter.provider.givenName$ }$ $else$ There are currently no encounters $endif$

10  Pros: ◦ Strict Model-View separation will make us program better  Cons: ◦ Unclear whether this approach has significant advantages over more-commonly-used technologies  Open Questions: ◦ When a module attaches to an extension point, that now becomes view-only, and can’t add any data to the model. Right?

11  ◦ Thanks Shazin! (ICEFaces 1.8, JSF 1.2, no Spring) ◦ JSF 2 with Spring in progress  JSF: Developed through the Java Community Process under JSR - 314, JavaServer Faces technology establishes the standard for building server-side user interfaces. With the contributions of the expert group, the JavaServer Faces APIs are being designed so that they can be leveraged by tools that will make web application development even easier  ICEFaces: J2EE Ajax framework for developing and deploying rich enterprise applications (REAs). With ICEfaces, enterprise Java developers can easily develop rich enterprise applications in Java, not JavaScript  JSF instead of Spring MVC ◦ Component-based ◦ Server-side state, stored in the session  Facelets instead of JSP  No Javascript required! JSF automatically reloads page fragments as required

12 // JSF 1.2 with XML-defined beans public class TableBean implements PageBean { private List headers; private List body; public List getBody() { return body; } public void setBody(List body) { this.body = body; } public List getHeaders() { return headers; } public void setHeaders(List headers) { this.headers = headers; } // JSF 2.0 with public class HelloWorldBean { public String getMessage() { return "Hello World!"; } public User getAuthenticatedUser() { return Context.getAuthenticatedUser(); }

13  Pros: ◦ JSF is the J2EE 6 Standard ◦ ICEFaces looks good  Cons: ◦ Steep learning curve ◦ Poor RAD (editing a single server-side component requires restarting Jetty)  Open Questions: ◦ How will module extensions work in a component- based framework?

14  frameworks/jruby+rails+jquery/  “Ruby on Rails is an open-source web framework that’s optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration”  “A domain-specific-language for database- backed web applications”  Thoughtworks CTO recommends Java backends with RoR-via-JRuby front-ends

15 class PatientController < ApplicationController def = Context.patientService.getPatient(params[:id].to_i) puts "No patient found!" raise "No patient found!" = # record that this user viewed this patient end def find ret = []; $omrs.patient_service.getPatients(params[:query]).each do |patient| ret << helpers.convert_to_dto(patient) end render :json => ret end end Conventions for project layout app controllers helpers models views layouts (controller) (action) config environments initializers locales public images javascripts stylesheets $(document).ready(function() { $("#tabs").tabs(); }); - … "widgets/encounter_list", :locals => { :encounters } %>

16  ActiveRecord and Migrations make it very easy to create (application-level) database-backed functionality  jruby script/generate model PatientViewed user_id:int patient_id:int This migration is automatically created class CreatePatientVieweds < ActiveRecord::Migration def self.up create_table :patient_vieweds do |t| t.integer :user_id t.integer :patient_id t.timestamps end def self.down drop_table :patient_vieweds end The “domain object” doesn’t declare any properties, because those are implied by the database table class PatientViewed < ActiveRecord::Base # get recent PatientVieweds for the given user def self.recently_viewed(user_id, n=5) all(:conditions => ["user_id = ?", user_id], :order => "created_at DESC", :limit => n ) end # get ids of patients recently viewed by the current user def self.recently_viewed_ids(user_id, n=5) recently_viewed(user_id, n).collect { |pv| pv.patient_id } end # record that a User viewed a Patient def self.record_view(openmrsuser, openmrspatient) destroy_all({ :user_id => openmrsuser.user_id, :patient_id => openmrspatient.patient_id }) create({ :user_id => openmrsuser.user_id, :patient_id => openmrspatient.patient_id }) end end

17  Pros: ◦ It’s Fun! ◦ Excellent RAD  Mongrel + Rails seems to be better than Jetty +Spring for this  ActiveRecord and migrations  Cons: ◦ Rails session != Java session => need to write our own session management ◦ No idea of Services  Domain objects are supposed to be intelligent  Wouldn’t be able to use the full power of the framework, because of our dumb domain objects. ◦ Potential for some annoying incompatibility to hit us out of the blue  Open Questions: ◦ How would module extensions work? Would an omod contain Java code *and* Ruby code? (Yuck.) ◦ How would Ruby migrations work with Liquibase? ◦ How good is Eclipse integration?

18 From views/widgets/_patient_search.html.erb... var options = { clickUrl: function(rowNum, item) { return "/patient/view/" + item.patient_id; }, icon: function(rowNum, item) { return ' '; }, … }; $(document).ready(function() { $('# _form').submit(function() { $.getJSON(" ", { query: $('# _query').val() }, _results_results_callback(options) ); return false; }) }); _form"> ID or Name: _query" type="text"/> _button"/> "widgets/vertical_panel", :locals => { :id => "#{id}_results", :options => patient_search_opts } %>

19  “GRAILS: the search is over… Have your next Web 2.0 project done in weeks instead of months. Grails delivers a new age of Java web application productivity.”  Attempts to replicate the magic of RoR in the Java world (used to be called “Groovy on Rails” until RoR asked them to stop) ◦ Uses Spring, Hibernate, SiteMesh, Jetty, …  Groovy ◦ Java + dynamic typing + closures + compiler magic ◦ 99.9% of legal Java is legal Groovy def results = Context.patientService.getPatients(“darius”).collect { [ ptId: it.patientId, name: it.personName.toString() ] }

20  class PatientController { def view = { def p = Context.patientService.getPatient(['patientId']); [ patient: p, encounters: Context.encounterService.getEncountersByPatient(p) ] } def searchJson = { List pats = Context.getPatientService().getPatients(params['query']); def output = pats.collect { [ patientId: it.patientId, age: it.age, gender: it.gender, name: it.personName.toString() ] } render output as JSON } class OpenmrsTagLib { static namespace = 'openmrs' def format = { attrs -> def obj = attrs['object'] f (obj != null) { if (obj instanceof User) { out << "${obj.username} (${formatName(obj.person)})“ } else { out << "${obj} (don't know how to handle ${obj.class})" } String ajaxSearchHelper(Map attrs) { … return """ ${createDecoratorIfNecessary} \$(document).ready(function() { \$("#${id}_form").submit(function() { … """ }

21  ◦ Thanks Harsha! … Patient Encounters … … Find a patient ID or Name: … It’s unlikely that we’d choose YUI over Jquery, even if it does come in the Grails-UI plugin…

22  Pros: ◦ It’s Fun! ◦ Almost no learning curve for current developers ◦ RAD almost as good as in Rails  GORM (analog of ActiveRecord)  Jetty (needs to restart more often than Mongrel) ◦ Sitemesh handles page templates ◦ Auto-recompiling groovy taglibs are great for pulling repeated code out of pages  Cons: ◦ Small community, possible lack of future support ◦ IDE integration is surprisingly mediocre ◦ A couple times I’ve read: “we lost almost all the productivity gains Grails gave us because of undocumented bugs in Grails”. (Personally Google searching has found me answers for all errors I’ve searched for.)  Open Questions: ◦ Can we use the embedded database to allow you to develop without even having a MySQL database? ◦ Is Spring Roo worth looking into as an alternative?

23  -Thanks Sy!  GWT is a development toolkit for building and optimizing complex browser-based applications  Ext JS is a cross-browser JavaScript library for building rich internet applications. Ext JS features high performance, customizable UI widgets and a well-designed and extensible component model.  => Ext GWT is a Java library for building rich internet applications with Google Web Toolkit (GWT)  You only write Java! GWT produces HTML, Javascript, AJAX, …  “Rich Internet Application” instead of “a webapp”

24 DTOs, for sending data between client and server package web.openmrs.common; … public class EncounterDTO implements Serializable { private Integer id; private Date date; private String location; private String type; private String provider; private List obs; … } Client UI code looks like a Swing app public class MainContent extends LayoutContainer { … public void openPatientDashboard(PatientDTO patient) { removeAll(); add(new PatientDashboard(patient)); layout(); } public class PatientDashboard extends LayoutContainer { protected void onRender(Element parent, int pos) { super.onRender(parent, pos); setLayout(new RowLayout(Orientation.VERTICAL)); … TabItem demographics = new TabItem("Demographics"); demographics.add(createDemographicsForm()); TabItem encounters = new TabItem("Encounters"); encounters.add(new PatientEncounterPanel2(patient)); tabs = new TabPanel(); tabs.add(demographics); tabs.add(encounters); … } You need lots of (formulaic) classes: (client) interface PatientService interface PatientServiceAsync (common) class PatientDTO (server) class PatientServiceImpl

25  This would be a completely different sort of application

26  Pros: ◦ No HTML or Javascript! ◦ “Since this is Java, the API and JavaDocs are available in the IDE as context sensitive help and the source code is available to look at instead of referring to (outdated) webpages, also has a large library of examples and showcase”  Cons: ◦ Have to build a set of DTOs and services specifically for GWT ◦ Steep(?) learning curve for existing and newbie devs ◦ “the initial load to the client's browser is fairly large but a good framework for loading is in place. the plus side to this is once it is loaded, the page never has to be loaded again so page loads do not exist, only data calls (reducing input/output over the wire as well as server load)”  Open Questions: ◦ Could modules plug in, given the client-server architecture?

27 Spring3-JSPSpring3- StringTemplate Spring3-JSF- ICEFaces JRuby-RailsGrailsGXT Learning curve (new dev) Medium HighLow High? Learning curve (existing dev) NoneLowHighLowTrivialHigh? OpenMRS Modules Easy??? Easy??? Embedded webserver Good (Jetty) OK (Jetty)Excellent (Mongrel) Good (Jetty)Good Embedded DB in dev mode ??? RAD domain objects ??? (Hibernate annotations?) ???Yes (ActiveRecord) Yes (GORM)No? LayoutsNeed to integrate something YesN/A?YesYes (Sitemesh)N/A Built-in Widgets None ICEFacesWon’t use EXT Tech for widgets Roll our ownStringTemplateJSFPartials, helpers Taglibs, templates “tight and extensible” Eclipse integration Good ?????? (RadRails)Mediocre (Spring plugin) Excellent (Google plugin) CommunityLargeLarge*LargeLarge*Small ConcernsNo ServicesModules may be impossible

28  More review of JSF 2 + ICEFaces 2  Is GXT even an option? ◦ Can it support modules?  Can we use an embedded DB in development mode with any of these technologies?  Can Hibernate Annotations provide some of the functionality of ActiveRecord/GORM in Spring-3-based technologies?  JSR-286 Portlets

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