Revision 922b1ce9
Added by Andreas Kohlbecker almost 4 years ago
| cdmlib-services/src/main/java/eu/etaxonomy/cdm/api/service/PreferenceServiceImpl.java | ||
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package eu.etaxonomy.cdm.api.service; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentHashMap; |
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import org.apache.log4j.Logger; |
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import org.springframework.beans.factory.annotation.Autowired; |
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@Autowired |
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private IPreferenceDao dao; |
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@Override |
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private Map<String, CdmPreference> cache = new ConcurrentHashMap<>(); |
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private boolean cacheIsComplete = false; |
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private boolean cacheIsLocked = false; |
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@Override |
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public CdmPreference findExact(PrefKey key) {
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return dao.get(key); |
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String cacheKey = cacheKey(key); |
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return fromCacheGet(key, cacheKey); |
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} |
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@Override |
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public CdmPreference find(PrefKey key) {
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List<CdmPreference> prefs = dao.list(); |
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CdmPreference pref = PreferenceResolver.resolve(prefs, key); |
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CdmPreference pref = PreferenceResolver.resolve(list(), key); |
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return pref; |
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} |
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|
| ... | ... | |
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@Transactional(readOnly = false) |
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public void set(CdmPreference preference) {
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dao.set(preference); |
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cachePut(preference); |
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} |
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@Override
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@Override
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@Transactional(readOnly = false) |
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public void remove(PrefKey preference) {
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dao.remove(preference); |
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public void remove(PrefKey key) {
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dao.remove(key); |
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removeFromCache(key); |
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} |
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@Override
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@Override
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public long count() {
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return dao.count(); |
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} |
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@Override |
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public List<CdmPreference> list() {
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return dao.list(); |
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if(!cacheIsComplete) {
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cacheFullUpdate(); |
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} |
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return new ArrayList<CdmPreference>(cacheValues()); |
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} |
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@Override |
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public List<CdmPreference> list(IPreferencePredicate<?> predicate) {
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// using the cache for this method makes not much sense |
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return dao.list(predicate); |
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} |
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@Override |
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public Object find(TaxonNode taxonNode, String predicate) {
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return dao.find(taxonNode, predicate); |
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public CdmPreference find(TaxonNode taxonNode, String predicate) {
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String cacheKey = cacheKey(taxonNode, predicate); |
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return fromCacheOrFind(taxonNode, predicate, cacheKey); |
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} |
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@Override |
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public CdmPreference find(TaxonNode taxonNode, IPreferencePredicate<?> predicate){
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return dao.find(taxonNode, predicate.getKey());
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return find(taxonNode, predicate.getKey()); |
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} |
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// ********************** NOT YET HANDLED *******************/ |
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throw new RuntimeException("mapToTaxonNode not yet implemented for " + taxonNodeRelatedCdmBase.getClass().getSimpleName());
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} |
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} |
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// ====================== Cache methods ======================= // |
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/** |
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* Concatenates subject and predicate as key for the cache map |
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*/ |
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private String cacheKey(PrefKey key) {
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return key.getSubject() + key.getPredicate(); |
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} |
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private String cacheKey(TaxonNode taxonNode, String predicate) {
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return taxonNode.treeIndex() + predicate; |
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} |
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// --------------- non locking cache read methods --------------- // |
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protected Collection<CdmPreference> cacheValues() {
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waitForCache(); |
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return cache.values(); |
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} |
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protected CdmPreference fromCacheGet(PrefKey key, String cacheKey) {
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waitForCache(); |
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return cache.computeIfAbsent(cacheKey, k -> dao.get(key)); |
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} |
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protected CdmPreference fromCacheOrFind(TaxonNode taxonNode, String predicate, String cacheKey) {
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waitForCache(); |
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return cache.computeIfAbsent(cacheKey, k -> dao.find(taxonNode, predicate)); |
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} |
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// --------------- cache locking methods --------------- // |
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protected void cachePut(CdmPreference preference) {
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waitForCache(); |
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cacheIsLocked = true; |
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cache.put(cacheKey(preference.getKey()), preference); |
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cacheIsLocked = false; |
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} |
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protected void removeFromCache(PrefKey key) {
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waitForCache(); |
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cacheIsLocked = true; |
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cache.remove(cacheKey(key)); |
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cacheIsLocked = false; |
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} |
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protected void cacheFullUpdate() {
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waitForCache(); |
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cacheIsLocked = true; |
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cache.clear(); |
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for(CdmPreference pref : dao.list()){
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cache.put(cacheKey(pref.getKey()), pref); |
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} |
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cacheIsLocked = false; |
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} |
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protected void waitForCache() {
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while(cacheIsLocked) {
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try {
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Thread.sleep(1); |
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} catch (InterruptedException e) {
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// just keep on sleeping, we may improve this later on |
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} |
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} |
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} |
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} |
Also available in: Unified diff
ref #9152 implementing service level cache for cdm preferences with locking mechanism