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/**
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* Copyright (C) 2018 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.persistence.dao.hibernate.common;
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import java.util.HashMap;
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import java.util.Map;
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import eu.etaxonomy.cdm.model.metadata.CdmPreference;
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import eu.etaxonomy.cdm.model.metadata.CdmPreference.PrefKey;
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import eu.etaxonomy.cdm.persistence.dao.common.IPreferenceDao;
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/**
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* Caching CdmPreference access class which updates the cached values after
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* the milliseconds as defined in <code>updateInterval</code> (currently 10 minutes).
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*
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* @author a.kohlbecker
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* @since Oct 2, 2018
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*
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*/
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public class CdmPreferenceLookup {
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private static CdmPreferenceLookup instance;
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public static CdmPreferenceLookup instance(){
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if(instance == null){
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instance = new CdmPreferenceLookup();
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}
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return instance;
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}
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long updateInterval = 10 * 60 * 1000l;
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private IPreferenceDao preferenceDao;
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private Map<PrefKey, CachedCdmPreference> map = new HashMap<>();
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public CdmPreference get(PrefKey key){
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CdmPreference cdmPref = null;
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CachedCdmPreference cached = map.get(key);
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if(cached == null || cached.isOutDated()){
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cdmPref = preferenceDao.get(key);
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if(cdmPref != null){
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map.put(key, new CachedCdmPreference(cdmPref));
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} else {
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map.remove(key);
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}
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} else {
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cdmPref = cached.cdmPreference;
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}
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return cdmPref;
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}
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public void setIPreferenceDao(IPreferenceDao preferenceDao){
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this.preferenceDao = preferenceDao;
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}
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class CachedCdmPreference {
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long time;
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CdmPreference cdmPreference;
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CachedCdmPreference(CdmPreference cdmPreference){
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this.cdmPreference = cdmPreference;
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time = System.currentTimeMillis();
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}
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boolean isOutDated(){
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return System.currentTimeMillis() - updateInterval > time;
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}
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}
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}
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