DatabaseContext.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 Deveel.Data.Configuration;
using Deveel.Data.Services;
using Deveel.Data.Store;
using Deveel.Data.Transactions;

namespace Deveel.Data {
    public sealed class DatabaseContext : Context, IDatabaseContext {
        internal DatabaseContext(ISystemContext systemContext, IConfiguration configuration)
            : base(systemContext) {
            if (systemContext == null)
                throw new ArgumentNullException("systemContext");
            if (configuration == null)
                throw new ArgumentNullException("configuration");

            ContextScope.Unregister<IConfiguration>();
            ContextScope.RegisterInstance<IConfiguration>(configuration);
            ContextScope.RegisterInstance<IDatabaseContext>(this);

            SystemContext = systemContext;

            Configuration = configuration;

            InitStorageSystem();
        }

        protected override string ContextName {
            get { return ContextNames.Database; }
        }

        private static IConfiguration CreateSimpleConfig(ISystemContext systemContext, string dbName) {
            if (String.IsNullOrEmpty(dbName))
                throw new ArgumentNullException("dbName");

            var config = new Configuration.Configuration(systemContext.Configuration);
            config.SetValue("database.name", dbName);
            return config;
        }

        protected override void Dispose(bool disposing) {
            if (disposing) {
                if (StoreSystem != null)
                    StoreSystem.Dispose();
            }

            StoreSystem = null;

            base.Dispose(disposing);
        }

        public IConfiguration Configuration { get; private set; }

        public ISystemContext SystemContext { get; private set; }

        public IStoreSystem StoreSystem { get; private set; }

        private void InitStorageSystem() {
            try {
                var storageTypeName = Configuration.GetString("database.storageSystem", DefaultStorageSystemNames.Heap);
                StoreSystem = this.ResolveService<IStoreSystem>(storageTypeName);

                if (StoreSystem == null)
                    throw new DatabaseConfigurationException("The storage system for the database was not set.");
            } catch(DatabaseConfigurationException) {
                throw;
            } catch (Exception ex) {
                throw new DatabaseConfigurationException("Could not initialize the storage system", ex);
            }
        }

        ITransactionContext IDatabaseContext.CreateTransactionContext() {
            return CreateTransactionContext();
        }

        public TransactionContext CreateTransactionContext() {
            return new TransactionContext(this);
        }
    }
}