76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
/**
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*
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*/
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package org.gcube.accounting.analytics.persistence;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.ServiceLoader;
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import org.gcube.accounting.analytics.exception.NoAvailableScopeException;
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import org.gcube.accounting.analytics.exception.NoUsableAccountingPersistenceQueryFound;
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import org.gcube.common.scope.api.ScopeProvider;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
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*/
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public abstract class AccountingPersistenceQueryFactory {
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private static Logger logger = LoggerFactory.getLogger(AccountingPersistenceQueryFactory.class);
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private static Map<String, AccountingPersistenceQuery> accountingPersistenceQueries;
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static {
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accountingPersistenceQueries = new HashMap<String, AccountingPersistenceQuery>();
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}
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public synchronized static AccountingPersistenceQuery getInstance() throws NoAvailableScopeException, NoUsableAccountingPersistenceQueryFound {
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String scope = ScopeProvider.instance.get();
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if(scope==null){
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new NoAvailableScopeException();
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}
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AccountingPersistenceQuery accountingPersistenceQuery = accountingPersistenceQueries.get(scope);
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if(accountingPersistenceQuery==null){
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try {
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ServiceLoader<AccountingPersistenceQuery> serviceLoader = ServiceLoader.load(AccountingPersistenceQuery.class);
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for (AccountingPersistenceQuery found : serviceLoader) {
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try {
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String foundClassName = found.getClass().getSimpleName();
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logger.debug("Testing {}", foundClassName);
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AccountingPersistenceQueryConfiguration configuration = new AccountingPersistenceQueryConfiguration(foundClassName);
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found.prepareConnection(configuration);
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accountingPersistenceQuery = found;
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break;
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} catch (Exception e) {
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logger.debug(String.format("%s not initialized correctly. It will not be used", found.getClass().getSimpleName()));
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}
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}
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} catch(Exception e){
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throw new NoUsableAccountingPersistenceQueryFound();
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}
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if(accountingPersistenceQuery==null){
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throw new NoUsableAccountingPersistenceQueryFound();
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}
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accountingPersistenceQueries.put(scope, accountingPersistenceQuery);
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}
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return accountingPersistenceQuery;
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}
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protected AccountingPersistenceQueryFactory(){
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}
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}
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