/*
* Copyright 2014-2016 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.springframework.integration.metadata;
/**
* Supports atomic updates to values in the store.
*
* @author Gary Russell
* @since 4.0
*
*/
public interface ConcurrentMetadataStore extends MetadataStore {
/**
* Atomically insert the key into the store.
*
* @param key The key.
* @param value The value.
* @return null if successful, the old value otherwise.
*/
String putIfAbsent(String key, String value);
/**
* Atomically replace the value for the key in the store if the old
* value matches the oldValue argument.
*
* @param key The key.
* @param oldValue The old value.
* @param newValue The new value.
* @return true if successful.
*/
boolean replace(String key, String oldValue, String newValue);
}