/*
* Copyright 2003-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.smodel.language;
import java.util.HashSet;
import java.util.Set;
/**
* Created by apyshkin on 7/15/15.
*/
final class LoadingRegistry<T> {
private final ThreadLocal<Set<T>> myConceptsInLoading = new ThreadLocal<Set<T>>() {
@Override
protected Set<T> initialValue() {
return new HashSet<T>();
}
};
protected boolean startLoad(T objectToRegister) {
Set<T> loadingObjects = myConceptsInLoading.get();
if (loadingObjects.contains(objectToRegister)) {
return false;
}
loadingObjects.add(objectToRegister);
return true;
}
protected void finishLoad(T objectToRegister) {
myConceptsInLoading.get().remove(objectToRegister);
}
}