core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/PrepareResult.java

/*
 * Copyright 2016 Open Networking Laboratory
 *
 * 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.onosproject.store.primitives.resources.impl;

/**
 * Response enum for two phase commit prepare operation.
 */
public enum PrepareResult {
    /**
     * Signifies a successful execution of the prepare operation.
     */
    OK,

    /**
     * Signifies some participants in a distributed prepare operation failed.
     */
    PARTIAL_FAILURE,

    /**
     * Signifies a failure to another transaction locking the underlying state.
     */
    CONCURRENT_TRANSACTION,

    /**
     * Signifies a optimistic lock failure. This can happen if underlying state has changed since it was last read.
     */
    OPTIMISTIC_LOCK_FAILURE,
}