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CHAPTER 2 ACCESS CLOUD TABLE STORAGE
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TableContext, DataTableService, and CloudTableServiceFactory. This will allow us to reuse the code to handle multiple data entities in our future development. Figure 2-14 shows the definition of properties and methods for the three interfaces in detail.
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Figure 2-14. Interfaces definition for cloud entity, cloud table storage service, and cloud table context
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Note The code for this example is in the exercise 2-2 bundle from the code download.
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The interface definition for ICloudEntity is shown in Listing 2-16. This interface exposes four methods: GetPartitionKey(), GetRowKey(), GetDependencyEntity(), and SetDependencyEntity(). Listing 2-16. Interface ICloudEntity Definition using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace CloudTableStorageService_WebRole.CloudTableStrorageDataEntity { using Microsoft.Samples.ServiceHosting.StorageClient; public interface ICloudEntity { string GetPartitionKey(); string GetRowKey(); ICloudEntity GetDepenencyEntity(); void SetDependencyEntity(ICloudEntity entity); List<ICloudEntity> DependencyType(); } }
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CHAPTER 2 ACCESS CLOUD TABLE STORAGE
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The interface definition for ICloudTableStorageService is shown in Listing 2-17. This interface expose four methods. One method is called TableContext() with return type of TableContext (we are going to define this new base class after the interfaces definitions), and the remaining three are basic data table I/O methods: Insert(), Update(), and Delete(). These three data table I/O functions accept the ICloudEntity type parameter. A class that implements the interface ICloudTableStorageService is used as the I/O service to expose the cloud table data. It is also responsible for resolving dependency issues (the relation between parent or child entity objects) during data table access in order to keep the integrity of the entire data structure. Listing 2-17. Interface ICloudTableStorageService Definition using using using using System; System.Collections.Generic; System.Linq; System.Text; CloudTableStorageService_WebRole.CloudTableStorageDataService Microsoft.Samples.ServiceHosting.StorageClient; CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; CloudTableStorageService_WebRole.CloudTableStorageDataContext;
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namespace { using using using
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public interface ICloudTableStorageService { bool Insert(ICloudEntity entity); bool Update(ICloudEntity entity); bool Delete(ICloudEntity entity); TableContext TableContext(); } } The interface definition for ITableContext is shown Listing 2-18. This interface defines one property TableName with a get/set accessing pair and two methods, QueryEntitiesByPartitionKey() and QueryEntitiesByRowKey(). The return type for these two methods is ICloudEntity, and the input parameter is PartitionKey and RowKey respectively. ITableContext is the facade class of a cloud data storage table that is responsible for retrieving URL endpoint information during the table context construction. This interface defines the basic query function for retrieving the cloud storage table. Listing 2-18. Interface ITableContext Definition using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace CloudTableStorageService_WebRole.CloudTableStorageDataContext { using CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; public interface ITableContext {
CHAPTER 2 ACCESS CLOUD TABLE STORAGE
string TableName { get; set; } ICloudEntity QueryEntitiesByPartionKey(string partitionKey); ICloudEntity QueryEntitiesByRowKey(string rowKey); } } As Listing 2-19 shows, a new abstract base class TableContext is defined to implement the interface ITableContext. This base class inherits from the class TableStorageDataServiceContext of StorageClient implemented in the Azure SDK. This class has one property access function, TableName, and two abstract methods, QueryEntitiesByPartitionKey() and QueryEntitiesByRowKey(). Listing 2-19. Abstract Base Class using using using using System; System.Collections.Generic; System.Linq; System.Web;
namespace CloudTableStorageService_WebRole.CloudTableStorageDataContext { using Microsoft.Samples.ServiceHosting.StorageClient; using CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; abstract public class TableContext : TableStorageDataServiceContext, ITableContext { public string TableName { get; set; } public TableContext(StorageAccountInfo accountInfo) : base(accountInfo) { } abstract public ICloudEntity QueryEntitiesByPartionKey(string partitionKey); abstract public ICloudEntity QueryEntitiesByRowKey(string rowKey); } } The class CloudTableServiceFactory is a utility class that implements the factory method design pattern using.NET Reflection to dynamically instantiate the concrete cloud table entity subclasses. The implementation of this class is shown in Listing 2-20. Listing 2-20. The Class CloudTableServiceFactory Implements the Factory Method Design Pattern Used to Dynamically Create a Concrete Cloud Table Class using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.Reflection;
CHAPTER 2 ACCESS CLOUD TABLE STORAGE
namespace CloudTableStorageService_WebRole.CloudTableStorageDataService { using CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; public class CloudTableServiceFactory { public CloudTableServiceFactory() { } public ICloudTableStorageService FactoryCloudTableService(ICloudEntity entity) { ICloudTableStorageService cloudTableStorageService = null; try { Assembly assembly = Assembly.GetExecutingAssembly(); string typeName = string.Format( "{0}.{1}TableService", this.GetType().Namespace, entity.GetType().Name); cloudTableStorageService = Activator.CreateInstance(assembly.GetType(typeName), new object[] { }) as ICloudTableStorageService; } catch (Exception ex) { } return cloudTableStorageService; } } } As Listing 2-21 shows, we have re-engineered the class DataTableService to implement the interface ICloudTableStorageService. A new member variable with type of CloudTableServiceFactory is defined in this class and has been instantiated in the constructor. The major modification to the cloud table data I/O methods, such as Insert(), Update(), and Delete(), from the versions used in the previous exercise is looping through the dependency tables to apply the data I/O actions. The instances of the data table service for all dependency data tables are dynamically created using the class names. The dependency table collection list of a data entity table is populated in the data entity table class constructor by calling the method _Initialization(). Listing 2-21. Re-engineering the Class DataTableService to Implement the Interface ICloudTableStorageService using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.Data.Services.Client;
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