Apache Sling

subsets

• OSGi
• Apache Jackrabbit
• Apache Lucene

XPath query in JCR

/jcr:root/content/users/* [fn:name()="_chenyang_40masols.com"]
/jcr:root/content/users/* [position()=2]

Postion is not useful to limit the result of a query.

Wrapped javax.jcr.query.InvalidQueryException: Unsupported expression with position(). Only = is supported.

See also

• http://jackrabbit.apache.org/oak/docs/query/query.html
• sling source code http://svn.apache.org/repos/asf/sling/trunk/
• JCR Query Cheat Sheet
  • https://wiki.magnolia-cms.com/display/WIKI/JCR+Query+Cheat+Sheet
  • http://aempodcast.com/2015/aem-resources/aem-queries-xpath-jcr-sql2-query-builder-syntaxes/#.WmX8w5P1V3k
  • https://github.com/paulrohrbeck/aem-links/blob/master/querybuilder_cheatsheet.md

ESP

EcmaScript Pages http://www.ecmascript.org/

Learning about ESP pages in Sling http://asserttrue.blogspot.jp/2010/07/learning-about-esp-pages-in-sling.html

You want to use java in your ECMA (.esp) script. https://helpx.adobe.com/experience-manager/kb/JavaFromEsp.html

var adminSession = sling.getService(Packages.org.apache.sling.jcr.api.SlingRepository).loginAdministrative(null);
var query = adminSession.getWorkspace().getQueryManager().createQuery(expression, "xpath");
query.setLimit(int(limit));

OSGi Sling Service Example http://blogs.adobe.com/kmossman/2012/04/osgi-sling-service-example.html

Global objects and functions in esp

• print
• load

ref

• http://sling.apache.org/apidocs/sling6/org/apache/sling/scripting/javascript/helper/SlingGlobal.html
• https://docs.adobe.com/docs/en/aem/6-0/develop/sightly/global-objects.html
• https://cwiki.apache.org/confluence/display/SLING/Scripting+variables

Sling Architecture

https://docs.google.com/drawings/d/1vhztjfSVpK9eSAyQhLPFvpX-wD2hHlE5Pug37Ri7sEU/edit?usp=sharing

Term

“qtp” in logs

Thread #106/qtp2082046022-106 [priority=5, alive=true, daemon=false, interrupted=false, loader=sun.misc.Launcher$AppClassLoader@61e63e3d]

means “QuartzThreadPool”

Common API Document

• JCR API: http://www.day.com/specs/jsr170/javadocs/jcr-2.0/index.html
• Sling API: http://sling.apache.org/apidocs/sling6/index.html
• Apache Common IO: http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html