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The Java operations layer for the MongoDB Java Driver. Third parties can wrap this layer to provide custom higher-level APIs

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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 com.mongodb;

import static com.mongodb.assertions.Assertions.notNull;
import static java.lang.String.format;

/**
 * A read concern level allows clients to choose a level of isolation for their reads.
 *
 * @mongodb.server.release 3.2
 * @mongodb.driver.manual reference/read-concern/#read-concern-levels Read Concern Levels
 * @since 3.2
 */
public enum ReadConcernLevel {

    /**
     * The local read concern level.
     */
    LOCAL("local"),

    /**
     * The majority read concern level.
     */
    MAJORITY("majority"),

    /**
     * The linearizable read concern level.
     *
     * 

* This read concern level is only compatible with {@link ReadPreference#primary()}. *

* * @since 3.4 * @mongodb.server.release 3.4 */ LINEARIZABLE("linearizable"), /** * The snapshot read concern level. * * @since 3.8 * @mongodb.server.release 4.0 */ SNAPSHOT("snapshot"), /** * The available read concern level. * * @since 3.9 * @mongodb.server.release 3.6 */ AVAILABLE("available"); private final String value; ReadConcernLevel(final String readConcernLevel) { this.value = readConcernLevel; } /** * @return the String representation of the read concern level that the MongoDB server understands */ public String getValue() { return value; } /** * Returns the ReadConcern from the string read concern level. * * @param readConcernLevel the read concern level string. * @return the read concern */ public static ReadConcernLevel fromString(final String readConcernLevel) { notNull("readConcernLevel", readConcernLevel); for (ReadConcernLevel level : ReadConcernLevel.values()) { if (readConcernLevel.equalsIgnoreCase(level.value)) { return level; } } throw new IllegalArgumentException(format("'%s' is not a valid readConcernLevel", readConcernLevel)); } }




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