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Trino - Hive connector

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/*
 * 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 io.trino.plugin.hive;

import io.trino.spi.connector.ConnectorMetadata;
import io.trino.spi.connector.ConnectorTransactionHandle;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static com.google.common.base.Preconditions.checkState;

public class HiveTransactionManager
{
    private final ConcurrentMap transactions = new ConcurrentHashMap<>();

    public TransactionalMetadata get(ConnectorTransactionHandle transactionHandle)
    {
        return transactions.get(transactionHandle);
    }

    public TransactionalMetadata remove(ConnectorTransactionHandle transactionHandle)
    {
        return transactions.remove(transactionHandle);
    }

    public void put(ConnectorTransactionHandle transactionHandle, TransactionalMetadata metadata)
    {
        ConnectorMetadata previousValue = transactions.putIfAbsent(transactionHandle, metadata);
        checkState(previousValue == null);
    }
}