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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.tools.visualvm.core.datasource;
import com.sun.tools.visualvm.core.datasupport.DataChangeEvent;
import com.sun.tools.visualvm.core.datasupport.DataChangeListener;
import java.util.Set;
/**
* Central repository of all known DataSources.
* Whenever is a new DataSource added to DataSources tree, DataSourceRepository
* detects it and emits notifications to listeners.
*
* @author Jiri Sedlacek
*/
public final class DataSourceRepository extends DataSourceProvider {
private static DataSourceRepository sharedInstance;
private final Listener dataChangeListener = new Listener();
/**
* Returns singleton instance of DataSourceRepository.
*
* @return singleton instance of DataSourceRepository.
*/
public synchronized static DataSourceRepository sharedInstance() {
if (sharedInstance == null) sharedInstance = new DataSourceRepository();
return sharedInstance;
}
void registerDataSourcesImpl(Set<? extends DataSource> added) {
super.registerDataSourcesImpl(added);
for (DataSource dataSource : added) dataSource.getRepository().addDataChangeListener(dataChangeListener, DataSource.class);
}
void unregisterDataSourcesImpl(Set<? extends DataSource> removed) {
super.unregisterDataSourcesImpl(removed);
for (DataSource dataSource : removed) dataSource.getRepository().removeDataChangeListener(dataChangeListener);
}
private DataSourceRepository() {
registerDataSource(DataSource.ROOT);
}
private class Listener implements DataChangeListener<DataSource> {
public void dataChanged(DataChangeEvent<DataSource> event) {
Set<DataSource> added = event.getAdded();
Set<DataSource> removed = event.getRemoved();
if (!added.isEmpty() || !removed.isEmpty()) changeDataSources(added, removed);
}
}
}