113 lines
3.0 KiB
Java
113 lines
3.0 KiB
Java
package org.gcube.portlets.widgets.ckancontentmoderator.server;
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import java.util.concurrent.ConcurrentHashMap;
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import org.gcube.datacatalogue.utillibrary.server.DataCatalogueImpl;
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import org.gcube.datacatalogue.utillibrary.server.cms.CatalogueContentModeratorSystem;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* A factory for getting CatalogueContentModeratorSystem objects.
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*
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* @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
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*
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* Jun 14, 2021
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*/
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public class CatalogueCMSFactory {
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private static final Logger logger = LoggerFactory.getLogger(CatalogueCMSFactory.class);
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private static final long MAX_LIFETIME = 1000 * 60 * 30; // 30 MINUTES
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private static CatalogueCMSFactory instance = new CatalogueCMSFactory();
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private static ConcurrentHashMap<String, CacheBean> cache;
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/**
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* The Class CacheBean.
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*
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* @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
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*
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* Jun 16, 2021
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*/
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private class CacheBean {
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DataCatalogueImpl dataCatalogueImpl;
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long ttl;
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/**
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* Instantiates a new cache bean.
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*
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* @param ttl the ttl
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* @param dataCatalogueImpl the data catalogue impl
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*/
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public CacheBean(long ttl, DataCatalogueImpl dataCatalogueImpl) {
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this.ttl = ttl;
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this.dataCatalogueImpl = dataCatalogueImpl;
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}
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}
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/**
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* Private constructor.
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*/
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private CatalogueCMSFactory() {
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logger.debug(CatalogueCMSFactory.class.getSimpleName() + " object build");
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cache = new ConcurrentHashMap<String, CacheBean>();
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}
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/**
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* Get the factory instance.
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*
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* @return the factory
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*/
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public static CatalogueCMSFactory getFactory() {
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logger.debug(CatalogueCMSFactory.class.getSimpleName() + " requested");
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return instance;
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}
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/**
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* Gets the CMS per scope.
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*
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* @param scope the scope
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* @return the CMS per scope
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* @throws Exception the exception
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*/
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public CatalogueContentModeratorSystem getCMSPerScope(String scope) throws Exception {
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DataCatalogueImpl dataCatalogueImpl = getCatalogueImplPerScope(scope);
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return dataCatalogueImpl.getCatalogueContentModerator();
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}
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/**
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* Gets the catalogue impl per scope.
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*
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* @param scope the scope
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* @return the catalogue impl per scope
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* @throws Exception the exception
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*/
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public DataCatalogueImpl getCatalogueImplPerScope(String scope) throws Exception {
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if (scope == null || scope.isEmpty())
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throw new IllegalArgumentException("Invalid scope given!");
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if (cache.containsKey(scope) && !expired(cache.get(scope))) {
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return cache.get(scope).dataCatalogueImpl;
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} else {
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logger.info("Creating " + CatalogueCMSFactory.class.getSimpleName() + " for scope " + scope);
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DataCatalogueImpl dci = new DataCatalogueImpl(scope);
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cache.put(scope, new CacheBean(System.currentTimeMillis(), dci));
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return dci;
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}
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}
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/**
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* Check if the ckan information must be retrieved again.
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*
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* @param cacheBean the cache bean
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* @return true, if successful
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*/
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private boolean expired(CacheBean cacheBean) {
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return (cacheBean.ttl + MAX_LIFETIME < System.currentTimeMillis());
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}
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}
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