DeveelDbTransaction.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.Data;
using System.Data.Common;


namespace Deveel.Data.Client {
    public sealed class DeveelDbTransaction : DbTransaction {
        private DeveelDbConnection connection;
        private IsolationLevel isolationLevel;
        private bool finished;

        internal DeveelDbTransaction(DeveelDbConnection connection, IsolationLevel isolationLevel, int commitId) {
            if (connection == null)
                throw new ArgumentNullException("connection");

            this.connection = connection;
            CommitId = commitId;
            this.isolationLevel = isolationLevel;
            connection.Transaction = this;
        }

        private void AssertNotFinished() {
            if (finished)
                throw new InvalidOperationException("The transaction was already finished.");
        }


        public override void Commit() {
            if (connection == null ||
                (connection.State != ConnectionState.Open &&
                 connection.State != ConnectionState.Executing))
                throw new InvalidOperationException("The underlying connection must be opened.");

            AssertNotFinished();

            try {
                Connection.CommitTransaction(CommitId);
            } finally {
                Connection.Transaction = null;
                finished = true;
            }
        }

        public override void Rollback() {
            if (connection == null ||
                (connection.State != ConnectionState.Open &&
                 connection.State != ConnectionState.Executing))
                throw new InvalidOperationException("The underlying connection must be opened.");

            AssertNotFinished();

            try {
                Connection.RollbackTransaction(CommitId);
            } finally {
                Connection.Transaction = null;
                finished = true;
            }
        }

        public new DeveelDbConnection Connection {
            get { return connection; }
        }

        protected override DbConnection DbConnection {
            get { return Connection; }
        }

        public override IsolationLevel IsolationLevel {
            get { return isolationLevel; }
        }

        internal int CommitId { get; private set; }

        protected override void Dispose(bool disposing) {
            if (disposing) {
                if (!finished)
                    Rollback();
            }

            connection = null;

            base.Dispose(disposing);
        }
    }
}