2 * Copyright 2017-present Open Networking Foundation
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package io.atomix.utils.concurrent;
19 * Reference counting interface.
21 * Types that implement {@code ReferenceCounted} can be counted for references and thus used to clean up resources once
22 * a given instance of an object is no longer in use.
24 * @author <a href="http://github.com/kuujo">Jordan Halterman</a>
26 public interface ReferenceCounted<T> extends AutoCloseable {
29 * Acquires a reference.
31 * @return The acquired reference.
36 * Releases a reference.
38 * @return Indicates whether all references to the object have been released.
43 * Returns the number of open references.
45 * @return The number of open references.
50 * Defines an exception free close implementation.