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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.impl.api;

import org.neo4j.gqlstatus.ErrorClassification;
import org.neo4j.gqlstatus.ErrorGqlStatusObjectImplementation;
import org.neo4j.gqlstatus.GqlStatusInfoCodes;
import org.neo4j.internal.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.impl.transaction.tracing.TransactionWriteEvent;
import org.neo4j.storageengine.api.StorageEngineTransaction;
import org.neo4j.storageengine.api.TransactionApplicationMode;

/**
 * For databases in read only mode, the implementation of {@link org.neo4j.kernel.impl.api.TransactionCommitProcess}
 * will simply always throw an exception on commit, to ensure that no changes are made.
 */
public class ReadOnlyTransactionCommitProcess implements TransactionCommitProcess {
    @Override
    public long commit(
            StorageEngineTransaction batch,
            TransactionWriteEvent transactionWriteEvent,
            TransactionApplicationMode mode)
            throws TransactionFailureException {
        var gql = ErrorGqlStatusObjectImplementation.from(GqlStatusInfoCodes.STATUS_08N08)
                .withClassification(ErrorClassification.CLIENT_ERROR)
                .build();
        throw new TransactionFailureException(
                gql,
                Status.General.ForbiddenOnReadOnlyDatabase,
                "Transactions cannot be committed in a read-only Neo4j database");
    }
}