Page Comparison

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Two member variables of UserInstance class are used to maintain this cache implementation (a home grown cache implementation). 1-

systemCache (see UP-1145)

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systemCharacterCache

If caching is enabled and character caching is NOT enabled then the SAX that represents the user's layout for the folder (tab) they are requesting will be attempted to be cached in the systemCache. If character caching is enabled, the serialized form of that layout will be stored in systemCharacterCache. Both indexed by the cacheKey from constructCacheKey(), which incidentally, has a bad side effect. If you look in processUserLayoutParameters() it manually binds the username to the theme preferences. This guarantees that no two users can share any cache entries. If the character cache is enabled, the system cache is not used.

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The following is a dissection of the cache key.

Code Block

title	An example of a cache key

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399820,userLayoutRootNode,system1activeTab=1userLayoutRoot=rootnewNodeID=authenticated=true(folder:s10087:

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50%,)(folder:s10057:50%,)(folder:s10083:50%,)(folder:s10101:50%,)(folder:s10080:50%,)(folder:s10075:50%,)(

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folder:s10099:50%,)(folder:s10097:50%,)(folder:s10070:50%,)(folder:s10095:50%,)(folder:s10064:50%,)(folder:

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s10091:50%,)userName=JohnDoeskin=spring(channel:n10077:false,)(channel:n10058:false,)7885417921252830597

Code Block

	xml
	xml
title	Cache Key, made up of 4 top-level components


<person-id><comma><req-method-node-id><comma><upref-cache-key><ulayout-mgr-cache-key>

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Key component	Value
<person-id>

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	399820
<comma>

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	,
<req-method-node-id>

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	userLayoutRootNode
<comma>

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	,
<upref-cache-key>

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system1activeTab=1userLayoutRoot=rootnewNodeID=authenticated=true(folder:s10087:50%,)(folder:s10057:50%,)(

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folder:s10083:50%,)(folder:s10101:50%,)(folder:s10080:50%,)(folder:s10075:50%,)(folder:s10099:50%,)(folder:

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s10097:50%,)(folder:s10070:50%,)(folder:s10095:50%,)(folder:s10064:50%,)(folder:s10091:50%,)userName=John Doeskin=spring(channel:n10077:false,)(channel:n10058:false,)

<ulayout-mgr-cache-key>

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7885417921252830597

How each value is obtained:

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I believe there are thread contention issues with these two variables (systemCache UP-1145 and systemCharacterCache) since both are not synchronized and reads and updates are not made within the synchronized blocks either.

Example systemCharacterCache markup.

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Code Block

	xml
	xml
title	Example systemCharacterCache markup


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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<html lang="en" xml:lang="en"><head><title>myRutgers</title><meta content="text/html; charset=iso-8859-1" http-equiv="content-type" /><link type="image/x-icon" href="favicon.ico" rel="Shortcut Icon" /><link type="text/css" href="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/skin/myrutgers1.css" rel="stylesheet" /></head><body><div id="portal-page-header"><div id="logo"><img alt="myRutgers Logo" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/institutional/uportal_logo_grid.gif" height="60" width="255" /></div>

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<div id="tabs"><ul><li><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=1"><span>Everyday</span></a></li><li><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=2"><span>Libraries</span></a></li><li id="active-tab"><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=3"><span>Campus Life</span></a></li><li><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=4"><span>Administration</span></a></li><li><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=5"><span>Reporting Tools</span></a></li><li><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab=6"><span>myTab</span></a></li></ul></div></div><div id="portal-page-body"><table width="100%" cellspacing="15" cellpadding="0"><tr><td valign="top" width="50%"><div class="portlet-toolbar"><div><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_tcattr=minimized&amp;minimized_channelId=n10081&amp;minimized_n10081_value=true#n10081"><img title="shade" alt="shade" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/max.gif" /></a><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=n10081"><img title="maximize" alt="maximize" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/focus.gif" /></a><a onclick="return confirm('Are you sure you want to remove this channel?')" href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_remove_target=n10081"><img title="remove" alt="remove" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/remove.gif" /></a></div><a name="n10081"><h2 id="n10081">Maps and Buildings</h2></a></div><div class="portlet clearfix">

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</div><div class="portlet-toolbar"><div><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_tcattr=minimized&amp;minimized_channelId=n10082&amp;minimized_n10082_value=true#n10082"><img title="shade" alt="shade" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/max.gif" /></a><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=n10082"><img title="maximize" alt="maximize" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/focus.gif" /></a><a onclick="return confirm('Are you sure you want to remove this channel?')" href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_remove_target=n10082"><img title="remove" alt="remove" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/remove.gif" /></a></div><a name="n10082"><h2 id="n10082">Athletics</h2></a></div><div class="portlet clearfix">

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</div></td><td valign="top" width="50%"><div class="portlet-toolbar"><div><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_tcattr=minimized&amp;minimized_channelId=n10084&amp;minimized_n10084_value=true#n10084"><img title="shade" alt="shade" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/max.gif" /></a><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=n10084"><img title="maximize" alt="maximize" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/focus.gif" /></a><a onclick="return confirm('Are you sure you want to remove this channel?')" href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_remove_target=n10084"><img title="remove" alt="remove" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/remove.gif" /></a></div><a name="n10084"><h2 id="n10084">Parking/Transportation</h2></a></div><div class="portlet clearfix">

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</div><div class="portlet-toolbar"><div><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_tcattr=minimized&amp;minimized_channelId=n10085&amp;minimized_n10085_value=true#n10085"><img title="shade" alt="shade" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/max.gif" /></a><a href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_root=n10085"><img title="maximize" alt="maximize" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/focus.gif" /></a><a onclick="return confirm('Are you sure you want to remove this channel?')" href="tag.90299c0feb91b440.render.userLayoutRootNode.uP?uP_remove_target=n10085"><img title="remove" alt="remove" height="19" width="19" src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers1/controls/remove.gif" /></a></div><a name="n10085"><h2 id="n10085">Buses/Shuttles</h2></a></div><div class="portlet clearfix">

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</div></td></tr></table></div><div id="portal-page-footer"><div><a href="http://www.rutgers.edu/" target="_blank"><img src="media/edu/rutgers/acs/portal/layout/tab-column/rutgers-theme/myrutgers/institutional/rutgers_footer_logo.gif" title="Go to Rutgers home page" alt="Rutgers Logo" height="30" width="99" /></a></div><p>

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					Links to campus web sites:
					<a href="http://camden-www.rutgers.edu/" target="_blank">Camden</a>,

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					<a href="http://rutgers-newark.rutgers.edu/" target="_blank">Newark</a>,

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					<a href="http://nbp.rutgers.edu/" target="_blank">New Brunswick/Piscataway</a>,

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					<a href="http://www.rutgers.edu/" target="_blank">Rutgers University</a>.

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					<br />
					For assistance, contact the Help Desks in:
					<a href="http://rucs.camden.rutgers.edu/" target="_blank">Camden</a>,

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					<a href="http://www.ncs.rutgers.edu/helpdesk/" target="_blank">Newark</a>,

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 or
					<a href="http://www.nbcs.rutgers.edu/helpdesk/hdnew/" target="_blank">New Brunswick/Piscataway</a>.

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				</p></div></body></html>

Versions Compared

Old Version 34

New Version 35

Key

How each value is obtained:

Example systemCharacterCache markup.