org.springframework.integration.metadata.ConcurrentMetadataStore.java Source code

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Here is the source code for org.springframework.integration.metadata.ConcurrentMetadataStore.java

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/*
 * Copyright 2014-2019 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
 *
 *      https://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);

}