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What's new in DWR version 3
1.
What’s new in
DWR v3 Joe Walker DWR Lead Developer SitePen UK
2.
Recap
Since we last talked ... Named Parameters Binary Files JavaScript Extending Java Better Reverse Ajax Data Sync: Dojo Data Store JSON / JSONP / JSON-RPC Varargs and Overloaded Methods What’s Next © SitePen, Inc. 2008. All Rights Reserved
3.
Recap © SitePen, Inc.
2008. All Rights Reserved
4.
© SitePen, Inc.
2008. All Rights Reserved
5.
Marshalling Types
Primitive types, and their Object counterparts int, boolean, long, float, double, etc Obvious classes String, Date, BigDecimal, BigInteger, Enum, etc Arrays and Collections Map, List, Set, Iterator, ... JavaBeans and Objects XML objects DOM, XOM, JDom, Dom4J © SitePen, Inc. 2008. All Rights Reserved
6.
© SitePen, Inc.
2008. All Rights Reserved
7.
Since we last
talked ... TIBCO General Interface SitePen http://svn.directwebremoting.org © SitePen, Inc. 2008. All Rights Reserved
8.
Named Parameters © SitePen,
Inc. 2008. All Rights Reserved
9.
Named Parameters
DWR will create client-side classes to look like server-side classes to make passing parameters easy © SitePen, Inc. 2008. All Rights Reserved
10.
Named Parameters
Java: public interface Person { ... } public class Employee implements Person { ... } public class Manager extends Employee { ... } public HumanResources { public void addPerson(Person p) { ... } } JavaScript: Manager m = new Manager(); HumanResources.addPerson(m); © SitePen, Inc. 2008. All Rights Reserved
11.
Named Parameters
Why? • Inheritance is useful in places • It saves creating addEmployee() and addManager() methods © SitePen, Inc. 2008. All Rights Reserved
12.
Lightweight Named
Parameters © SitePen, Inc. 2008. All Rights Reserved
13.
Lightweight Named Parameters
DWR also allows a lighter-weight method of declaring types © SitePen, Inc. 2008. All Rights Reserved
14.
Lightweight Named Parameters
Java: public interface Person { ... } public class Employee implements Person { ... } public class Manager extends Employee { ... } public HumanResources { public void addPerson(Person p) { ... } } JavaScript: var m = { $dwrClassName:'Manager', firstname:'Joe', ...}; HumanResources.addPerson(m); © SitePen, Inc. 2008. All Rights Reserved
15.
Lightweight Named Parameters
Why? • Everything as for Named Parameters • But sometimes you get an object from somewhere else © SitePen, Inc. 2008. All Rights Reserved
16.
Binary Files: File
Upload © SitePen, Inc. 2008. All Rights Reserved
17.
Binary Files: File
Upload DWR has always had a long list of things that it will marshall including Dates, DOM trees, etc In addition, DWR will now marshall binary files just as if they were the text resources it handles now © SitePen, Inc. 2008. All Rights Reserved
18.
Binary Files: File
Upload Java: public Remoted { public void receiveBinaryFile(byte[] uploaded) { ... } } HTML: <input id='fileId' type='file'/> JavaScript: var binary = dwr.util.getValue('fileId'); Remoted.receiveBinaryFile(binary); © SitePen, Inc. 2008. All Rights Reserved
19.
Binary Files: File
Upload Will marshall to: • byte[] • java.awt.BufferedImage • java.io.InputStream • org.directwebremoting.io.FileTransfer (gives access to filename and mime-type in addition to the contents) © SitePen, Inc. 2008. All Rights Reserved
20.
Binary Files: File
Upload Why? • This is a lot easier than using commons-fileupload or similar • We can provide integration with progress bar widgets © SitePen, Inc. 2008. All Rights Reserved
21.
Binary Files: Download ©
SitePen, Inc. 2008. All Rights Reserved
22.
Binary Files: Download
Binary file handling is 2 way. It’s good for: • Images • PDF files • Word, Excel documents • etc. © SitePen, Inc. 2008. All Rights Reserved
23.
Binary Files: Download
Java: public Remoted { public void getPDF(String contents) { ByteArrayOutputStream buf = new ByteArrayOutputStream(); Document doc = new Document(); PdfWriter.getInstance(doc, buf); doc.open(); doc.add(new Paragraph(contents)); doc.close(); return new FileTransfer(quot;ex.pdfquot;, quot;application/pdfquot;, buf.toByteArray()); } JavaScript: Remoted.getPDF('Joe', function(data) { dwr.engine.openInDownload(data); }); © SitePen, Inc. 2008. All Rights Reserved
24.
Binary Files: Download
Why? • This is a lot easier than creating a special PDF/ image/etc serving servlet © SitePen, Inc. 2008. All Rights Reserved
25.
Javascript extending Java ©
SitePen, Inc. 2008. All Rights Reserved
26.
Javascript extending Java
DWR will allow you to implement Java interfaces using JavaScript © SitePen, Inc. 2008. All Rights Reserved
27.
Javascript extending Java
Java: public interface BazListener { void somethingChanged(String msg); } public class Remote { public void addBazListener(BazListener bl) { ... } public void calledLater() { for (BazListener bl : listeners) bl.somethingChanged(quot;JS objects can implement Java interfacesquot;); } ... } JavaScript: function BazListener() {this.$dwrByRef;} BazListener.prototype.somethingChanged = function(msg){alert(msg);}; var bl = new BazListener(); Remote.addBazListener(bl); © SitePen, Inc. 2008. All Rights Reserved
28.
Javascript extending Java
Why? • Intuitive way to interact • Easy Pub-sub • Allows interaction with existing APIs © SitePen, Inc. 2008. All Rights Reserved
29.
Scalable Reverse Ajax ©
SitePen, Inc. 2008. All Rights Reserved
30.
Scalable Reverse Ajax
Previously there were some scalability limitations with the 2.0 reverse ajax API. 3.0 deprecates the problem areas. © SitePen, Inc. 2008. All Rights Reserved
31.
Scalable Reverse Ajax
Reverse Ajax proxies no longer take a list of ScriptSessions in the constructor, they just write to the current ‘destination’ The Browser API allows you to change the current ‘destination’ © SitePen, Inc. 2008. All Rights Reserved
32.
Scalable Reverse Ajax
// The default destination is the browser // that caused the current action to happen. Window.alert(quot;Helloquot;); // Non DWR thread have no default destination Thread t = new Thread(new Runnable()) { public void run() { // Error Window.alert(quot;Helloquot;); } }); © SitePen, Inc. 2008. All Rights Reserved
33.
Scalable Reverse Ajax
// Set the destination to be all browsers that // are looking at the current page Browser.withCurrentPage(new Runnable()) { public void run() { Window.alert(quot;Helloquot;); } }); // Set the destination to be all browsers that // are looking at the current page Browser.withCurrentPage(quot;index.htmlquot;, new Runnable()) { public void run() { Window.alert(quot;Helloquot;); } }); © SitePen, Inc. 2008. All Rights Reserved
34.
Scalable Reverse Ajax
// Broadcast to everyone Browser.withAllSessions(...); // Broadcast to subsets Browser.with*Filtered(scriptSesssionFilter, ...); // To a known individual Browser.withSession(sessionId, ...); © SitePen, Inc. 2008. All Rights Reserved
35.
Scalable Reverse Ajax
Why? • It’s generally easier to use • It decouples generation from routing • It scales © SitePen, Inc. 2008. All Rights Reserved
36.
Reverse Ajax APIs ©
SitePen, Inc. 2008. All Rights Reserved
37.
Reverse Ajax APIs
Reverse Ajax != Comet Reverse Ajax == Comet + Polling + Piggyback © SitePen, Inc. 2008. All Rights Reserved
38.
Reverse Ajax APIs:
JS Level // Low level: Use server-side W3C DOM methods Element ele = doc.createElement(quot;pquot;); ScriptSessions.addFunctionCall( quot;document.body.appendChildquot;, ele); © SitePen, Inc. 2008. All Rights Reserved
39.
Reverse Ajax APIs:
JS Level // Low level: Any arbitrary JavaScript String s = quot;if (document.all) window.alert('IE');quot;; ScriptSessions.addScript(s); © SitePen, Inc. 2008. All Rights Reserved
40.
Reverse Ajax APIs:
DOM Level // Some methods from Window and Document import javax.servlet.http.Cookie; import org.directwebremoting.ui.browser.Document; Cookie c = new Cookie(quot;namequot;, quot;valuequot;); Document.setCookie(c); © SitePen, Inc. 2008. All Rights Reserved
41.
Reverse Ajax APIs:
dwr.util // dwr.util in Java import org.directwebremoting.ui.dwr.Util; String[] opts = new String[] {quot;onequot;,quot;twoquot;,...}; Util.addOptions(quot;liquot;, opts); © SitePen, Inc. 2008. All Rights Reserved
42.
Reverse Ajax APIs:
Scriptaculous // Scriptaculous Effects in Java import org.directwebremoting.ui.scriptaculous.Effect; Effect.fade(quot;someIdquot;); © SitePen, Inc. 2008. All Rights Reserved
43.
Reverse Ajax APIs:
TIBCO GI // TIBCO General Interface in Java import jsx3.GI; import jsx3.app.*; import jsx3.gui.*; Server server = GI.getServer(quot;servernamequot;); TextBox phoneNum = server.getJSXByName(quot;phoneNumquot;, TextBox.class); phoneNum.setValue(quot;servernamequot;); © SitePen, Inc. 2008. All Rights Reserved
44.
Reverse Ajax APIs:
Dojo // Dojo in Java import org.dojotoolkit.dijit.Dijit; import org.dojotoolkit.dijit.Editor; Editor e = Dijit.byId(quot;pricequot;, Editor.class); e.setValue(42); © SitePen, Inc. 2008. All Rights Reserved
45.
Scalable Reverse Ajax
Why? • A full range of APIs for dynamically updating client data • DWR doesn’t do widgets, but it does talk to the people that do Drapgen can be used to create and maintain large APIs © SitePen, Inc. 2008. All Rights Reserved
46.
Dojo Data Store ©
SitePen, Inc. 2008. All Rights Reserved
47.
Dojo Data Store
DWR now implements all 4 interfaces to allow Dojo to sync data with Java code on the server © SitePen, Inc. 2008. All Rights Reserved
48.
Dojo Data Store
Java: // Load the data somehow Map<String, Person> ppl = ...; // Create an implementation of StoreProvider to hold the data MapStoreProvider provider = new MapStoreProvider(ppl, Person.class); // Tell DWR to expose the data to the internet Directory.register(quot;testServerDataquot;, provider); © SitePen, Inc. 2008. All Rights Reserved
49.
Dojo Data Store
HTML: <table id=quot;gridquot; dojoType=quot;dojox.grid.DataGridquot; ><tr> <th field=quot;namequot; width=quot;120pxquot; editable=quot;truequot;>Name</th> ... </tr></table> JavaScript: dojo.registerModulePath(quot;dwrquot;, quot;path/from/dojo/to/dwrquot;); dojo.require(quot;dwr.data.Storequot;); dwrStore = new dwr.data.Store(quot;testServerDataquot;, { subscribe:true }); dijit.byId(quot;gridquot;).setStore(dwrStore); © SitePen, Inc. 2008. All Rights Reserved
50.
Dojo Data Store
Java: // The StoreProvider from earlier MapStoreProvider provider = ... // Get a representation of the internal data Map<String, Person> data = provider.asMap(); // Mutate it data.addPerson(new Person(...)); // The browsers viewing the data automagically update © SitePen, Inc. 2008. All Rights Reserved
51.
Dojo Data Store
Why? • Data-Sync APIs are hard to get right, but are really simple to use • There is lots of potential for network level optimization © SitePen, Inc. 2008. All Rights Reserved
52.
JSON / JSONP
/ JSON-RPC © SitePen, Inc. 2008. All Rights Reserved
53.
Dojo Data Store
DWR now supports: • plain JSON • JSONP • JSON-RPC © SitePen, Inc. 2008. All Rights Reserved
54.
JSONP
Java: public class Demo { public sayHello(String name) { return quot;Hello, quot; + name; } } Shell: $ wget http://example.com/app/dwr/jsonp/Demo/sayHello? ↩ callback=callback¶m0=quot;Joequot; -> callback(quot;Hello, Joequot;); © SitePen, Inc. 2008. All Rights Reserved
55.
JSONP
Dojo: dojo.io.script.get({ url:'http://example.com/app/dwr/jsonp/Demo/sayHello', content:{param:'Joe'} }).addCallback(function() { ... }); JQuery: $.ajax({ dataType:'jsonp', data:'param=Joe', url:'http://example.com/app/dwr/jsonp/Demo/sayHello', success:function () { ... }, }); © SitePen, Inc. 2008. All Rights Reserved
56.
JSON / JSONP
/ JSON-RPC Why? • To allow DWR to remote functions to things other than a DWR client • ‘DWRP’ is designed to be something we can change without a long deprecation process © SitePen, Inc. 2008. All Rights Reserved
57.
Varargs © SitePen, Inc.
2008. All Rights Reserved
58.
Varargs
You can now call methods with a vararg parameter © SitePen, Inc. 2008. All Rights Reserved
59.
Varargs
Java: public Remoted { public void method(String... arg) { ... } } JavaScript: Remoted.method(quot;Onequot;, quot;Twoquot;, quot;Threequot;); © SitePen, Inc. 2008. All Rights Reserved
60.
Varargs
Why? • It saves the hassle of wrapping options in an array or collection before a method is called Alert: • It could break some corner cases when mixing servlet parameters with normal parameters © SitePen, Inc. 2008. All Rights Reserved
61.
Overloaded Methods © SitePen,
Inc. 2008. All Rights Reserved
62.
Overloaded Methods
Previously DWR prevented you from reliably calling overloaded methods © SitePen, Inc. 2008. All Rights Reserved
63.
Overloaded Methods
Java: public Remoted { public void method(int num) { log.debug(quot;int method called with quot; + num); } public void method(String str) { log.debug(quot;String method called with quot; + str); } } JavaScript: Remoted.method(quot;String Paramquot;); Remoted.method(42); © SitePen, Inc. 2008. All Rights Reserved
64.
Overloaded Methods
Why? • It saves you from creating multiple proxy methods to existing APIs © SitePen, Inc. 2008. All Rights Reserved
65.
What’s Next © SitePen,
Inc. 2008. All Rights Reserved
66.
Top Directions for
DWR 3.1 Shorter release cycle Gears SMD Dojo: • Reverse Ajax API support • Auto-build Rest © SitePen, Inc. 2008. All Rights Reserved
67.
Any Questions?
• http://directwebremoting.org • http://sitepen.com © SitePen, Inc. 2008. All Rights Reserved
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