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/*
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.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.server.rest.transactional;

import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.security.AccessMode;
import org.neo4j.kernel.impl.core.ThreadToStatementContextBridge;
import org.neo4j.kernel.impl.coreapi.InternalTransaction;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacade;

class TransitionalTxManagementKernelTransaction
{
    private final GraphDatabaseFacade db;
    private final KernelTransaction.Type type;
    private final AccessMode mode;
    private final ThreadToStatementContextBridge bridge;

    private InternalTransaction tx;
    private KernelTransaction suspendedTransaction;

    TransitionalTxManagementKernelTransaction( GraphDatabaseFacade db, KernelTransaction.Type type,
            AccessMode mode, ThreadToStatementContextBridge bridge )
    {
        this.db = db;
        this.type = type;
        this.mode = mode;
        this.bridge = bridge;
        this.tx = db.beginTransaction( type, mode );
    }

    void suspendSinceTransactionsAreStillThreadBound()
    {
        assert suspendedTransaction == null : "Can't suspend the transaction if it already is suspended.";
        suspendedTransaction = bridge.getTopLevelTransactionBoundToThisThread( true );
        bridge.unbindTransactionFromCurrentThread();
    }

    void resumeSinceTransactionsAreStillThreadBound()
    {
        assert suspendedTransaction != null : "Can't resume the transaction if it has not first been suspended.";
        bridge.bindTransactionToCurrentThread( suspendedTransaction );
        suspendedTransaction = null;
    }

    public void terminate()
    {
        tx.terminate();
    }

    public void rollback()
    {
        try
        {
            KernelTransaction kernelTransactionBoundToThisThread = bridge.getKernelTransactionBoundToThisThread( false );
            kernelTransactionBoundToThisThread.failure();
            kernelTransactionBoundToThisThread.close();
        }
        catch ( TransactionFailureException e )
        {
            throw new RuntimeException( e );
        }
        finally
        {
            bridge.unbindTransactionFromCurrentThread();
        }
    }

    public void commit()
    {
        try
        {
            KernelTransaction kernelTransactionBoundToThisThread = bridge.getKernelTransactionBoundToThisThread( true );
            kernelTransactionBoundToThisThread.success();
            kernelTransactionBoundToThisThread.close();
        }
        catch ( TransactionFailureException e )
        {
            throw new RuntimeException( e );
        }
        finally
        {
            bridge.unbindTransactionFromCurrentThread();
        }
    }

    void closeTransactionForPeriodicCommit()
    {
        tx.close();
    }

    void reopenAfterPeriodicCommit()
    {
        tx = db.beginTransaction( type, mode );
    }
}