Ulrich Krause, Milano, 27 Settembre 2013

La vita nella corsia di sorpasso
A tutta velocità, XPages!
Life in the Fast Lane – Full Speed XPages!

About: me
Administrator /Developer since 1993
Senior Software Architect at BCC...
Life in the Fast Lane – Full Speed XPages!

Agenda
What factors affect Performance?
Java vs. JavaScript
ViewNavigator vs. ...
Life in the Fast Lane – Full Speed XPages!

XPages Request
Life in the Fast Lane – Full Speed XPages!

Hardware
The hardware used has a significant influence on
performance. There a...
Life in the Fast Lane – Full Speed XPages!

Hardware
Main Memory
• Limit defined by the operating system
•  Scalability

...
Life in the Fast Lane – Full Speed XPages!

Network
Latency
• Time taken for data transmission between multiple computers ...
Life in the Fast Lane – Full Speed XPages!

Client & Browser
Hardware
How many data requests / responses are transmitted
H...
Life in the Fast Lane – Full Speed XPages!

Limiting factors on performance
Browser / HTTP server
• Network latency – dist...
Life in the Fast Lane – Full Speed XPages!

Limiting factors on performance
App Server / Domino context
• Read design elem...
Life in the Fast Lane – Full Speed XPages!

Limiting factors on performance
Servlet / Lifecycle
• Restore control tree – f...
Life in the Fast Lane – Full Speed XPages!

General Performance Options
notes.ini
• HTTPJVMMaxHeapSizeSet=1
• HTTPJVMMaxHe...
Life in the Fast Lane – Full Speed XPages!

Reducing Memory Utilization
xsp.persistence.mode=
• Defines the persistence mo...
Life in the Fast Lane – Full Speed XPages!

XPages Design Optimizations
Use Simple actions vs links or button with
window....
Life in the Fast Lane – Full Speed XPages!

XPages Design Optimizations
Load-time vs Runtime
• Using loaded vs rendered
• ...
Life in the Fast Lane – Full Speed XPages!

JavaScript/CSS Aggregation
Groups many DOJO, CSS / JS files into a single file...
Life in the Fast Lane – Full Speed XPages!

JavaScript/CSS Aggregation
Life in the Fast Lane – Full Speed XPages!

XPages PreLoad
XPagesPreload=1
New Feature in Notes / Domino 8.5.3
Works on Se...
Life in the Fast Lane – Full Speed XPages!

XPages PreLoad
XPagesPreloadDB =
Server!!Db.nsf/XPage.xsp, myLocalDb.nsf

Work...
Life in the Fast Lane – Full Speed XPages!

XPages PreLoad (cont.)
For each entry in the notes.ini variable, an XPage URL
...
Life in the Fast Lane – Full Speed XPages!

Scoped Variables
applicationScope
• Are visible for all users of one applicati...
Life in the Fast Lane – Full Speed XPages!

Scoped Variables (cont.)
viewScope
• Is visible for views on the current page ...
Life in the Fast Lane – Full Speed XPages!

Caching with Application Scope
Life in the Fast Lane – Full Speed XPages!

JSF Lifecycle
Life in the Fast Lane – Full Speed XPages!

XPages Lifecycle Listener
What happens in each phase of the JSF lifecycle?

Ul...
Life in the Fast Lane – Full Speed XPages!

XPages Masterclass

http://www.openntf.org/internal/home.nsf/project.xsp?actio...
Life in the Fast Lane – Full Speed XPages!

When to Execute - # vs $
#
• Executed every time the page is rendered
• Use fo...
Life in the Fast Lane – Full Speed XPages!

DataContext
Can be thought of as global variables
Value can be computed dynami...
Life in the Fast Lane – Full Speed XPages!

DataContext - Pitfall
Do not bind data context variables dynamically.
• They w...
Life in the Fast Lane – Full Speed XPages!

DataContext - Pitfall
Life in the Fast Lane – Full Speed XPages!

Partial Refresh / Update (Pro)
Reduced control processing in the render respon...
Life in the Fast Lane – Full Speed XPages!

Partial Refresh / Update (Cons)
Dependancy outside of the partial update area
...
Life in the Fast Lane – Full Speed XPages!

Partial Refresh / Update (Cons)
Refreshing more than one target ID in a single...
Life in the Fast Lane – Full Speed XPages!

Partial Execution
Reduced processing in the 3 data-processing phases
• Means l...
Life in the Fast Lane – Full Speed XPages!

Partial Execution (cont.)
onclick Event Handler must be in the exec area
• The...
Life in the Fast Lane – Full Speed XPages!

Partial Execution
execMode added in 8.5.1 (not in 8.5.0)
execId slightly diffi...
Life in the Fast Lane – Full Speed XPages!

disableValidators / immediate
disableValidators
•
•
•
•

JSF life cycle throug...
Life in the Fast Lane – Full Speed XPages!

Minimize work in rendered/ visible
computation like CSS “style” are only compu...
Life in the Fast Lane – Full Speed XPages!

Minimize work in rendered / visible
computationproperty is computed in all 5 l...
Life in the Fast Lane – Full Speed XPages!

Using loaded vs rendered
Loaded
• is only computed once in the createView phas...
Life in the Fast Lane – Full Speed XPages!

Images
Use correct file type depending on content
• JPEG for complex and detai...
Life in the Fast Lane – Full Speed XPages!

Image Sprites
Use CSS Image Sprites
• If you have multiple small images, make ...
Life in the Fast Lane – Full Speed XPages!

CSS Image Sprite Sample

http://www.w3schools.com/css/tryit.asp?filename=trycs...
Life in the Fast Lane – Full Speed XPages!

XPages Toolbox
XPages based Application
• Runs on the Domino server or the Not...
Life in the Fast Lane – Full Speed XPages!

XPages Toolbox
Life in the Fast Lane – Full Speed XPages!

XPages Toolbox
Generate a heap dump of the JVM running in the HTTP
task
• A bu...
Life in the Fast Lane – Full Speed XPages!

Heapdump / Javadump Analyzer
Life in the Fast Lane – Full Speed XPages!

More Tools
Print statements
• In rendered/visible computations to see how ofte...
Life in the Fast Lane – Full Speed XPages!

More Tools
Browser developer tools
• for watching network transactions, partia...
Life in the Fast Lane – Full Speed XPages!

Optimization – Step By Step
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS
Get all „Contacts“ into a NotesDocumentCollection,
loop the coll...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – UNID from Item
Get all „Contacts“ into a NotesDocumentCollecti...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – UNID from Item
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS - SingleItem
Get all „Contacts“ into a NotesDocumentCollection,
...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS - SingleItem
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – ViewNavigator
loop thru a view and get the JSON from a view co...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – ViewNavigator
Life in the Fast Lane – Full Speed XPages!

StringBuilder vs String.concat
Concatenation of Strings is very easy in Java -...
Life in the Fast Lane – Full Speed XPages!

StringBuilder vs String.concat
When to use StringBuilder over '+' (String.conc...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – ViewNavigator +
StringBuilder and get the JSON from a view col...
Life in the Fast Lane – Full Speed XPages!

XAgent – SSJS – ViewNavigator +
StringBuilder
Life in the Fast Lane – Full Speed XPages!

XAgent – Java
loop thru a view and get the JSON from a view column.
Use a Stri...
Life in the Fast Lane – Full Speed XPages!

XAgent – Java
Life in the Fast Lane – Full Speed XPages!

Themes
Single document containing references to all your CSS
resources
• resou...
Life in the Fast Lane – Full Speed XPages!

Themes
Create your own themes from scratch.
• Extending an existing theme will...
Life in the Fast Lane – Full Speed XPages!

Load Resources from Themes
Global Application / Configuration properties
Questions ?

Feedback
ulrich_krause@bcc.biz
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Life in the Fast Lane: Full Speed XPages!, #dd13

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Using XPages out of the box lets you build good looking and well performing applications. However, as XPage applications become bigger and more complex, performance can become an issue and, if it comes to scalability and speed optimization, there are a couple of things to take into consideration. Learn how to use partial refresh and partial execution mode and how to monitor its execution using a JSF LifeCycle monitor to avoid multiple re-calculation of controls. We will show tools that can allow you to profile your code, readily available from OpenNTF, along with a demonstration of how to use them to improve the speed of your code. Still writing SSJS and encounter a significant slow down when using Script Libraries? See, how you can improve the speed of your application using JAVA instead of JS, JSON and even @formulas.

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Life in the Fast Lane: Full Speed XPages!, #dd13

  1. 1. Ulrich Krause, Milano, 27 Settembre 2013 La vita nella corsia di sorpasso A tutta velocità, XPages!
  2. 2. Life in the Fast Lane – Full Speed XPages! About: me Administrator /Developer since 1993 Senior Software Architect at BCC OpenNTF Contributor OpenNTF Board of Directors Blog http://www.eknori.de IBM Champion 2011/2012/2013 Notes Forum (http://www.atnotes.de)
  3. 3. Life in the Fast Lane – Full Speed XPages! Agenda What factors affect Performance? Java vs. JavaScript ViewNavigator vs. GetNextDocument Stringbuilder vs. Concat (+) JSF Lifecycle Listener Partial Update / Partial Execute Variable Resolver Tools
  4. 4. Life in the Fast Lane – Full Speed XPages! XPages Request
  5. 5. Life in the Fast Lane – Full Speed XPages! Hardware The hardware used has a significant influence on performance. There are 3 key elements: • CPU • Main Memory • Hard Disk
  6. 6. Life in the Fast Lane – Full Speed XPages! Hardware Main Memory • Limit defined by the operating system •  Scalability CPU • Cores / Clock / Cache •  Poor response time Weak CPU AND Low Memory • Poor overall performance • Poor response times • Server "hangs"
  7. 7. Life in the Fast Lane – Full Speed XPages! Network Latency • Time taken for data transmission between multiple computers on a network Bandwidth • Rate of transmission of data Greater Bandwidth + Lower Latency -------------------------------= Better Connection
  8. 8. Life in the Fast Lane – Full Speed XPages! Client & Browser Hardware How many data requests / responses are transmitted How much data is transferred (size) Caching of resources How much CSJS runs Size / complexity of the CSS Complexity of the site structure
  9. 9. Life in the Fast Lane – Full Speed XPages! Limiting factors on performance Browser / HTTP server • Network latency – distance/time to server. • Bandwidth – size of files. • Browser limits on concurrent downloads • IE7 allows 2 downloads, IE8 allows 6 HTTP Server / App Server • HTTP Server JVM heap size & garbage collector • CPU time, competition between threads, gives slower response times • Threads, limited to 40 by default
  10. 10. Life in the Fast Lane – Full Speed XPages! Limiting factors on performance App Server / Domino context • Read design elements from the NSF (XPage .class files, form structure, etc) • Backend API calls may be expensive, especially for large data sets. • Design elements may be network requests.
  11. 11. Life in the Fast Lane – Full Speed XPages! Limiting factors on performance Servlet / Lifecycle • Restore control tree – file system read. Control tree locking – no concurrent access. • Rendered re-evaluated for every control for most phases Browser/Client JavaScript/Dojo • Inline JavaScript blocks insertion of later HTML elements into the DOM tree • Dojo does AJAX requests for .js files for dojo modules that are not loaded
  12. 12. Life in the Fast Lane – Full Speed XPages! General Performance Options notes.ini • HTTPJVMMaxHeapSizeSet=1 • HTTPJVMMaxHeapSize=256M • Should be set to ¼ of the available RAM Domino Administrator • HTTP server "Enable logging to" disabled • HTTP server thread count – defaults to 40 Remember, enabling the debugger affects performance • JavaEnableDebug=1 • JavaDebugOptions=transport=dt_socket,server=y,suspend=n,address=8000 • JavascriptEnableDebug=1
  13. 13. Life in the Fast Lane – Full Speed XPages! Reducing Memory Utilization xsp.persistence.mode= • Defines the persistence mode for the JSF pages • file: All the pages are persisted on disk • fileex: All the pages are persisted on disk except the current one, which stays in memory • <else>: All the pages stay in memory (tree mode)
  14. 14. Life in the Fast Lane – Full Speed XPages! XPages Design Optimizations Use Simple actions vs links or button with window.location JS Reduce server phase processing • Use partial update where possible • Use partial execute where possible • Use disableValidators & immediate event Minimize work in rendered / visible computations • Use variable resolver When using Repeats & Views • Use viewEntry.getColumnValue instead of viewEntry.getDocument.getColumn • Use Domino View data source dataCache property where possible
  15. 15. Life in the Fast Lane – Full Speed XPages! XPages Design Optimizations Load-time vs Runtime • Using loaded vs rendered • ExtLib Dynamic Content • allows partial re-loading, so more use of load-time optimizations Loading resources in the browser • CSS & browser JS • extract to separate files. Minify & compress files • Images • use correct size & format. Use CSS Image Sprites as possible
  16. 16. Life in the Fast Lane – Full Speed XPages! JavaScript/CSS Aggregation Groups many DOJO, CSS / JS files into a single file • • • • Less requests from the browser to the server Performance improvements on networks with high latency Enhanced performance parsing CSS / JS Fewer connections to the server On the Server: xsp.properties: xsp.resources.aggregate=true
  17. 17. Life in the Fast Lane – Full Speed XPages! JavaScript/CSS Aggregation
  18. 18. Life in the Fast Lane – Full Speed XPages! XPages PreLoad XPagesPreload=1 New Feature in Notes / Domino 8.5.3 Works on Server and Client Java classes from the XPages runtime plug-ins loaded from a fixed list of runtime classes ( 435 in ND 8.5.3 ) • com.ibm.xsp.core, common utility, JS wrapper, FSF runtime classes Java classes referenced in *-faces.config.xml • XPages control renderer, data sources, complex types
  19. 19. Life in the Fast Lane – Full Speed XPages! XPages PreLoad XPagesPreloadDB = Server!!Db.nsf/XPage.xsp, myLocalDb.nsf Works at the application level The application is loaded on the client / server startup into memory. • This happens even when the application is first opened in the browser
  20. 20. Life in the Fast Lane – Full Speed XPages! XPages PreLoad (cont.) For each entry in the notes.ini variable, an XPage URL is generated and sent to the server The application is loaded, and the HTML generated The XPages runtime discards the HTML, but retains the application in memory
  21. 21. Life in the Fast Lane – Full Speed XPages! Scoped Variables applicationScope • Are visible for all users of one application. • Expires some time after the last user used an applicationScope variable. • applicationScope variables are NOT persistent forever. sessionScope • Is valid through the session of the current user. • A user session expires after some time of inactivity. • Uses don't have access to the sessionScope variables of other users.
  22. 22. Life in the Fast Lane – Full Speed XPages! Scoped Variables (cont.) viewScope • Is visible for views on the current page only. • Useful for transporting a search query to a view. requestScope • Is valid through one request of the current user. • That includes refreshing of a page.
  23. 23. Life in the Fast Lane – Full Speed XPages! Caching with Application Scope
  24. 24. Life in the Fast Lane – Full Speed XPages! JSF Lifecycle
  25. 25. Life in the Fast Lane – Full Speed XPages! XPages Lifecycle Listener What happens in each phase of the JSF lifecycle? Ulrich Krause: http://openntf.org/XSnippets.nsf/snippet.xsp?id=a-simple-lifecyclelistener-
  26. 26. Life in the Fast Lane – Full Speed XPages! XPages Masterclass http://www.openntf.org/internal/home.nsf/project.xsp?action=openDocument&name=XPages%20Masterclass
  27. 27. Life in the Fast Lane – Full Speed XPages! When to Execute - # vs $ # • Executed every time the page is rendered • Use for values that are likely to change $ • Executed when the page is first loaded • Use for values that don't change
  28. 28. Life in the Fast Lane – Full Speed XPages! DataContext Can be thought of as global variables Value can be computed dynamically or on page load • You can use ${javascript:@Today()} and run it once rather than running a function each time. Can be scoped to any level that datasources can • XPage, Custom Control or Panel • Set a dataContext in a panel in a repeat control to avoid multiple references to a NotesDocument's item Is Referenced using EL • At no point in the references do you run SSJS • Not having to go through the SSJS parser
  29. 29. Life in the Fast Lane – Full Speed XPages! DataContext - Pitfall Do not bind data context variables dynamically. • They will be recomputed again and again, even when in partial execution mode and if they are not in use
  30. 30. Life in the Fast Lane – Full Speed XPages! DataContext - Pitfall
  31. 31. Life in the Fast Lane – Full Speed XPages! Partial Refresh / Update (Pro) Reduced control processing in the render response phase • Means less work on the server • RenderResponse is the most intensive phase Smaller response from server. • Means reduced network usage Better browser experience • Rest of the page is still visible while waiting for a response • Inserting small sections into the page is much faster than reloading a full page.
  32. 32. Life in the Fast Lane – Full Speed XPages! Partial Refresh / Update (Cons) Dependancy outside of the partial update area • Other areas of the control tree are not processed,so any SSJS scripts in those other controls will not be run. • Enabling Partial Update where it was previously full update may lead to functional problems Only one area may be partial updated by default • In CSJS you can schedule later partial updates of related areas, but any concurrent requests will wait for exclusive access to the server-side control tree before processing on the server http://www.timtripcony.com/blog.nsf/d6plinks/TTRY-84B6VP
  33. 33. Life in the Fast Lane – Full Speed XPages! Partial Refresh / Update (Cons) Refreshing more than one target ID in a single partial refresh event • http://www.timtripcony.com/blog.nsf/d6plinks/TTRY-84B6VP
  34. 34. Life in the Fast Lane – Full Speed XPages! Partial Execution Reduced processing in the 3 data-processing phases • Means less work on the server, faster response times Dependancy on Edit Box values outside of the exec area • Submitted values from Edit Boxes and/or other input controls in other areas of the control tree are not processed, so any control values and document fields in those other areas will not be updated. • Enabling Partial Exec where it was previously full execution may lead to functional problems where values are out-of date in the onclick script or in the redisplayed page.
  35. 35. Life in the Fast Lane – Full Speed XPages! Partial Execution (cont.) onclick Event Handler must be in the exec area • The ApplyRequestValues phase prepares for the invokeApplication phase. • The onclick simple action or SSJS script won't occur if outside the partial exec area
  36. 36. Life in the Fast Lane – Full Speed XPages! Partial Execution execMode added in 8.5.1 (not in 8.5.0) execId slightly difficult to select in Designer • Select your button, in the Outline view, toggle open the button, select the child Event Handler control, then set the execId property on the Event Handler. • [Better UI proposed in Notes/Domino Next – in the Events tab]
  37. 37. Life in the Fast Lane – Full Speed XPages! disableValidators / immediate disableValidators • • • • JSF life cycle through all phases (1-6) But requests will not validate the data Converters continue to work. Items in documents will be updated Immediate • • • • JSF Lifecycle processes only phases (1, 2, 6) No data processing Items in documents are not updated Onclick event handler scripts and render response calculations are performed
  38. 38. Life in the Fast Lane – Full Speed XPages! Minimize work in rendered/ visible computation like CSS “style” are only computed in Most properties, the RenderResponse phase Edit Box and input “value” properties are used in Data Processing phases and RenderResponse phase Data Source properties are computed during RenderResponse • Results are cached for the next request's Data Processing and InvokeApplication phases
  39. 39. Life in the Fast Lane – Full Speed XPages! Minimize work in rendered / visible computationproperty is computed in all 5 lifecycle The rendered phases Avoid re-computing values in every rendered property • @DbLookup, @DbColumn, getDocumentByKey • In the rendered property, save the computed boolean to a viewScope variable
  40. 40. Life in the Fast Lane – Full Speed XPages! Using loaded vs rendered Loaded • is only computed once in the createView phase • not re-computed in the other phases • false means the control is not created, so it can never be rendered. • true means the control is added to the control tree. • You can still compute rendered when loaded evaluates to true. Compute the loaded property on conditions • where you could compute the rendered property and save it to the view scope. It would never need to be recomputed for the rest of the interaction with this page
  41. 41. Life in the Fast Lane – Full Speed XPages! Images Use correct file type depending on content • JPEG for complex and detailed images • PNG/GIF for simple images, fonts, transparencies • Use the HTML <img> tag “width” and “height” attributes For faster HTML layout in the browser • Size the image to size you intend to use • Resizing using html attributes height and width will delay the rendering of your page • Images larger than necessary will waste bandwidth
  42. 42. Life in the Fast Lane – Full Speed XPages! Image Sprites Use CSS Image Sprites • If you have multiple small images, make a single larger image containing the smaller images • Use CSS to display only the relevant subset image at a location in the page • For semantically significant sprites, provide an accessibility “title” attribut (as sprites don't use the IMG “alt” attribute, but you still want to assist blind users) • There's no specific XPages support for sprites, but they're used in the XPages OneIU themes
  43. 43. Life in the Fast Lane – Full Speed XPages! CSS Image Sprite Sample http://www.w3schools.com/css/tryit.asp?filename=trycss_sprites_img
  44. 44. Life in the Fast Lane – Full Speed XPages! XPages Toolbox XPages based Application • Runs on the Domino server or the Notes client • An NSF needs to be installed on the server/Notes client • A profiler jar file should be added to the JVM launch options Measures CPU performance and memory allocation Available from OpenNTF.org • Free open source project • http://www.openntf.org/internal/home.nsf/project.xsp?action=openDocu ment&name=XPages%20Toolbox Extended in 8.5.2 to support backend classes profiling
  45. 45. Life in the Fast Lane – Full Speed XPages! XPages Toolbox
  46. 46. Life in the Fast Lane – Full Speed XPages! XPages Toolbox Generate a heap dump of the JVM running in the HTTP task • A button in the XPages profiler generates the heap dump • From the Domino console • tell http xsp heapdump (triggers com.ibm.jvm.Dump.HeapDump()) • tell http xsp javadump (triggers com.ibm.jvm.Dump.JavaDump()) Analyze the heap dump using the Eclipse memory analyzer • http://www.eclipse.org/mat/ • http://www.ibm.com/developerworks/java/jdk/tools/dtfj.html
  47. 47. Life in the Fast Lane – Full Speed XPages! Heapdump / Javadump Analyzer
  48. 48. Life in the Fast Lane – Full Speed XPages! More Tools Print statements • In rendered/visible computations to see how often executed • print("panel2 evaluating rendered property"); • In the XPages root control events: • before/afterPageLoad, afterRestoreView, before/afterRenderResponse. • Custom control root events: • before/afterPageLoad. • In the document data source events: • queryNewDocument, postSaveDocument, etc. Task Manager and/or Process Explorer • Shows CPU usage & process memory usage as it happens
  49. 49. Life in the Fast Lane – Full Speed XPages! More Tools Browser developer tools • for watching network transactions, partial updates, response times • BROWSER: Firebug, Developer Tools • XPiNC: FirebugLite from ExtLib Java / Javascript Debugging • Degrades performance but can inspect objectsUse the Eclipse Java debugger. • In Dominonotes.ini add these 2 options: • JavaEnableDebug=1 • JavaDebugOptions=transport=dt_socket,server=y,suspend=n,address=8000
  50. 50. Life in the Fast Lane – Full Speed XPages! Optimization – Step By Step
  51. 51. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS Get all „Contacts“ into a NotesDocumentCollection, loop the collection and build the JSON by reading the values from items in the document
  52. 52. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS
  53. 53. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – UNID from Item Get all „Contacts“ into a NotesDocumentCollection, loop the collection and build the JSON by reading the values from items in the document. Also UNID is stored in document
  54. 54. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – UNID from Item
  55. 55. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS - SingleItem Get all „Contacts“ into a NotesDocumentCollection, loop the collection and get the JSON from an item on the document. JSON is calculated on document save
  56. 56. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS - SingleItem
  57. 57. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – ViewNavigator loop thru a view and get the JSON from a view column.
  58. 58. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – ViewNavigator
  59. 59. Life in the Fast Lane – Full Speed XPages! StringBuilder vs String.concat Concatenation of Strings is very easy in Java - all you need is a '+‘ Each time you append something via '+' (String.concat()) a new String is created, the old stuff is copied, the new stuff is appended, and the old String is thrown away. The bigger the String gets the longer it takes - there is more to copy and more garbage is produced. Accordingly to Arno Unkrig the optimal strategy is to use String.concat() for 2 or 3 operands, and StringBuilder for 4 or more operands
  60. 60. Life in the Fast Lane – Full Speed XPages! StringBuilder vs String.concat When to use StringBuilder over '+' (String.concat()) ? • use StringBuilder whenever you assemble a String in a loop • Keep in mind that '+' isn't always a good idea http://kaioa.com/node/59
  61. 61. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – ViewNavigator + StringBuilder and get the JSON from a view column. loop thru a view Use a StringBuilder to concat the JSON
  62. 62. Life in the Fast Lane – Full Speed XPages! XAgent – SSJS – ViewNavigator + StringBuilder
  63. 63. Life in the Fast Lane – Full Speed XPages! XAgent – Java loop thru a view and get the JSON from a view column. Use a StringBuilder to concat the JSON + use Java instead of SSJS
  64. 64. Life in the Fast Lane – Full Speed XPages! XAgent – Java
  65. 65. Life in the Fast Lane – Full Speed XPages! Themes Single document containing references to all your CSS resources • resource sections reference the CSS files • control section define what CSS classes are applied to specific controls XML based and easy To learn • creating a new theme document prefills sample content Can extend other themes • <theme extends="webstandard"> • will automatically include all the resource and control definitions from that theme
  66. 66. Life in the Fast Lane – Full Speed XPages! Themes Create your own themes from scratch. • Extending an existing theme will include extra stylesheets and styles that you might not need. Be prepared to spend more time writing css though
  67. 67. Life in the Fast Lane – Full Speed XPages! Load Resources from Themes Global Application / Configuration properties
  68. 68. Questions ? Feedback ulrich_krause@bcc.biz

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