001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.core;
018
019/**
020 * Interface to be implemented by transparent resource proxies that need to be
021 * considered as equal to the underlying resource, for example for consistent
022 * lookup key comparisons. Note that this interface does imply such special
023 * semantics and does not constitute a general-purpose mixin!
024 *
025 * <p>Such wrappers will automatically be unwrapped for key comparisons in
026 * {@link org.springframework.transaction.support.TransactionSynchronizationManager}.
027 *
028 * <p>Only fully transparent proxies, e.g. for redirection or service lookups,
029 * are supposed to implement this interface. Proxies that decorate the target
030 * object with new behavior, such as AOP proxies, do <i>not</i> qualify here!
031 *
032 * @author Juergen Hoeller
033 * @since 2.5.4
034 * @see org.springframework.transaction.support.TransactionSynchronizationManager
035 */
036public interface InfrastructureProxy {
037
038        /**
039         * Return the underlying resource (never {@code null}).
040         */
041        Object getWrappedObject();
042
043}