com.google.gcloud.datastore.TransactionOption.java Source code

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Here is the source code for com.google.gcloud.datastore.TransactionOption.java

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/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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.google.gcloud.datastore;

import com.google.api.services.datastore.DatastoreV1;
import com.google.common.collect.ImmutableMap;

import java.io.Serializable;
import java.util.Map;

public abstract class TransactionOption implements Serializable {

    private static final long serialVersionUID = -1862234444015690375L;

    public static final class ForceWrites extends TransactionOption {

        private static final long serialVersionUID = -6873967516988380886L;

        private final boolean force;

        public ForceWrites(boolean force) {
            this.force = force;
        }

        public boolean force() {
            return force;
        }

        @Override
        BatchOption toBatchWriteOption() {
            return new BatchOption.ForceWrites(force);
        }
    }

    public static final class IsolationLevel extends TransactionOption {

        private static final long serialVersionUID = -5592165378565409515L;

        private final Level level;

        public enum Level {

            SERIALIZABLE(DatastoreV1.BeginTransactionRequest.IsolationLevel.SERIALIZABLE), SNAPSHOT(
                    DatastoreV1.BeginTransactionRequest.IsolationLevel.SNAPSHOT);

            private final DatastoreV1.BeginTransactionRequest.IsolationLevel levelPb;

            Level(DatastoreV1.BeginTransactionRequest.IsolationLevel levelPb) {
                this.levelPb = levelPb;
            }

            DatastoreV1.BeginTransactionRequest.IsolationLevel toPb() {
                return levelPb;
            }
        }

        public IsolationLevel(Level level) {
            this.level = level;
        }

        public Level level() {
            return level;
        }

        @Override
        BatchOption toBatchWriteOption() {
            return null;
        }
    }

    TransactionOption() {
        // package protected
    }

    public static ForceWrites forceWrites() {
        return new ForceWrites(true);
    }

    public static IsolationLevel serializable() {
        return new IsolationLevel(IsolationLevel.Level.SERIALIZABLE);
    }

    public static IsolationLevel snapshot() {
        return new IsolationLevel(IsolationLevel.Level.SNAPSHOT);
    }

    static Map<Class<? extends TransactionOption>, TransactionOption> asImmutableMap(TransactionOption... options) {
        ImmutableMap.Builder<Class<? extends TransactionOption>, TransactionOption> builder = ImmutableMap
                .builder();
        for (TransactionOption option : options) {
            builder.put(option.getClass(), option);
        }
        return builder.build();
    }

    abstract BatchOption toBatchWriteOption();
}