31 lines
1.8 KiB
Text
31 lines
1.8 KiB
Text
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<#-- $This file is distributed under the terms of the license in /doc/license.txt$ -->
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<#assign shortVisualizationURLRoot ="/vis">
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<#assign refreshCacheURL = "${urls.base}${shortVisualizationURLRoot}/refresh-cache">
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<h2>Visualization Tools</h2>
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<a href="${refreshCacheURL}">Refresh Cached Models for Visualization</a>
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<h5>Why</h5>
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Certain class of visualizations like Temporal graph and Map of Science that work on a large scale
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attempt to calculate counts of publications (or grants) for all the organizations within an organization.
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These queries tend to be both memory intensive and time consuming. In order to provide a good user experience when
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these visualizations are served we decided to save the results of these queries to be reused later.
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<h5>What</h5>
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To this end we have devised a caching solution which will store information about the organization
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hierarchy, which publications were published from which organizations etc (among other things) in
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semantic way (i.e. we store the rdf model).<br/>
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We're currently caching these models in-memory, which works nicely, for now. Currently the cache is only built
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once, on first user request after a server restart, so the visualization will essentially never be updated
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until the server is restarted again. It is not being updated real-time or periodically. This means that the data in these
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models might be stale depending upon when was it last created. In future releases we will come
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up with a solution that stores these models on disk and be updated periodically.<br />
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<h5>How</h5>
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To refresh these models either restart the server or click on "refresh cache" link above. We realize that
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in production VIVO instances it is not feasible to restart the server to refresh these models. Hence we
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recommend the above link. Administrators can use this link to trigger regeneration of all the existing
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models.<br />
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