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/*
* Copyright (c) 2008-2020 the original author or authors.
*
* 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 org.cometd.bayeux;
import java.util.concurrent.atomic.AtomicMarkableReference;
/**
* Immutable, non-volatile, non-atomic version of {@link AtomicMarkableReference}.
*
* @param the type of the reference
*/
public class MarkedReference {
private static final MarkedReference EMPTY = new MarkedReference<>(null, false);
/**
* @return a null-reference, non-marked instance
* @param the type of the null reference
*/
@SuppressWarnings("unchecked")
public static MarkedReference empty() {
return (MarkedReference)EMPTY;
}
private final T reference;
private final boolean marked;
public MarkedReference(T reference, boolean marked) {
this.reference = reference;
this.marked = marked;
}
public T getReference() {
return reference;
}
public boolean isMarked() {
return marked;
}
}