gobblin.commit.DeliverySemantics.java Source code

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Here is the source code for gobblin.commit.DeliverySemantics.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 gobblin.commit;

import com.google.common.base.Enums;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

import gobblin.configuration.ConfigurationKeys;
import gobblin.configuration.State;

/**
 * The semantics for data delivery.
 *
 * @author Ziyang Liu
 */
public enum DeliverySemantics {

    /**
     * Each data record from the source is guaranteed to be delivered at least once.
     */
    AT_LEAST_ONCE,

    /**
     * Each data record from the source is guaranteed to be delievered exactly once.
     */
    EXACTLY_ONCE;

    /**
     * Get the devliery semantics type from {@link ConfigurationKeys#DELIVERY_SEMANTICS}.
     * The default value is {@link Type#AT_LEAST_ONCE}.
     */
    public static DeliverySemantics parse(State state) {
        String value = state.getProp(ConfigurationKeys.GOBBLIN_RUNTIME_DELIVERY_SEMANTICS, AT_LEAST_ONCE.toString())
                .toUpperCase();
        Optional<DeliverySemantics> semantics = Enums.getIfPresent(DeliverySemantics.class, value);
        Preconditions.checkState(semantics.isPresent(), value + " is not a valid delivery semantics");
        return semantics.get();
    }
}