We do have a few business services, which require an IDBConnection.
It's quite important that these services do use the same dbconnection as the 'normal' Service-Stack service, so we do have atomic transactions.
our current solution for this problem is, to instantiate the business service in the servicestack-service constructor (using the IDbConnection that servicestack provides)
private readonly ITaskService _taskService;
public RegistrationService(IEmailService emailService, ITextProvider textProvider)
{
this._taskService = new TaskService(Db);
}
However, I feel like this is not very 'smart' and there might be a way better solution which I'm overlooking right now.
Would a better option be, to inject the DbFactory instead of the plain connection? If so, does DbFactory already solve this problem?
Best,
Daniel
If you need to use the same open Db connection as that of a ServiceStack Service you should pass it in from your Service, e.g:
public class MyServices : Service
{
public IMyDep MyDep { get; set; }
public object Any(MyRequest request)
{
MyDep.Method(Db);
}
}
Alternatively you can override GetDbConnection() in your AppHost to have it return the same db connection for that request, e.g:
public override IDbConnection GetDbConnection(IRequest req = null)
{
if (req != null)
{
if (req.Items.TryGetValue("RequestDb", out var oDb) && oDb is IDbConnection db)
return db;
db = base.GetDbConnection(req);
req.Items["RequestDb"] = db;
return db;
}
return base.GetDbConnection(req);
}
That in your dependencies can access from AppHost.GetDbConnection(), e.g:
public class MyDep : IMyDep
{
private IDbConnection db;
public virtual IDbConnection Db => db ?? (db = HostContext.AppHost.GetDbConnection(Request));
public object Method()
{
var row = Db.Select<Table>();
}
}
Related
I have a specific scenario here where I need to pass the connection string based on the user, because users may be mapped to the different databases based on his/her enterprise.
This is the code I use to resolve the dependency with a static variable:
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(
Component.For<IUserRepository>()
.ImplementedBy(typeof(IKS.Dare.Optimix.Repository.EntityFramework.UserModule.UserRepository))
.DependsOn(Dependency.OnValue("connectionString", DatabaseSettings.DefaultConnectionString))
);
}
Because this DefaultConnectionString is supposed to be a dynamic one, I don't want to lock this variable to make it thread safe, as this would degrade the performance. I would want a way so that I can deal with such situation.
Possible consideration which can be that we can give a session, which can be applied as follows:
DynamicParameters((k, d) => d["connectionString"] = Session["connectionString"])
But this is in a different project which doesn't utilize any web component, it's just an installer project which is basically designed for resolving the dependencies only.
My Generic repository looks like following
public class GenericRepository<T> : IGenericRepository<T> where T : BaseEntity
{
private const string IsActive = "IsActive", DbContext = "dbContext", EntityPropertyName = "Entity";
private string connectionString = String.Empty, provider = String.Empty;
public GenericRepository(string connectionString, string provider)
{
this.connectionString = connectionString;
this.provider = provider;
}
public int Count()
{
string tableName = typeof(T).Name;
string query = SqlQueryConstants.SelectCount + SqlQueryConstants.Space + tableName;
int count = DbHelper.ExecuteScalar<int>(query: query, commandType: System.Data.CommandType.Text, connectionString: connectionString, provider: provider, parameters: null);
return count;
}
}
DBHelper class looks like follows
public static int ExecuteNonQuery(string query, CommandType commandType = CommandType.StoredProcedure,
IList<DbParameter> parameters = null, int? timeout = null, string connectionString = "", string provider = "")
{
using (var connection = CreateDbConnection(connectionString, provider))
{
connection.Open();
using (DbCommand command = CreateDbCommand(sqlQuery: query, parameters: parameters,
connection: connection, commandType: commandType, timeout: timeout))
{
return command.ExecuteNonQuery();
}
}
}
public static DbParameter CreateParameter<TValue>(string name, TValue value, DbType dbType,
ParameterDirection parameterDirection = ParameterDirection.Input, string provider = "")
{
DbParameter param = CreateDbProviderFactory(provider).CreateParameter();
param.Value = value;
param.ParameterName = name;
param.DbType = dbType;
param.Direction = parameterDirection;
return param;
}
public static DbConnection CreateDbConnection()
{
return CreateDbConnection(String.Empty, String.Empty);
}
public static DbConnection CreateDbConnection(string connectionString = "", string provider = "")
{
DbConnection connection = null;
if (String.IsNullOrEmpty(provider))
{
if (String.IsNullOrEmpty(DatabaseSettings.DefaultProvider))
throw new ArgumentNullException("provider");
else
provider = DatabaseSettings.DefaultProvider;
}
connection = CreateDbProviderFactory(provider).CreateConnection();
connection.ConnectionString = connectionString;
return connection;
}
Any help would be greatly appreciated.
Note : I couldn't edit steven's answer.
[EDIT] To make it more clear it can be implemented as:
Here controller is inherited from BaseController
public class UserController : BaseController
{
//
// GET: /Index/
private IUserRepository userRepository;
public UserController(IUserRepository userRepository)
: base(userRepository)
{
this.userRepository = userRepository;
}
}
and BaseController is inherited from Controller where in the database settings are being set in the constructor of Base controller so that we don't need to set it everywhere
public abstract class BaseController : Controller
{
public BaseController(IUserRepository userRepository)
{
userRepository.connectionStringProvider.Provider = WebUtilities.CurrentUserData.Provider;
userRepository.connectionStringProvider.ConnectionString = WebUtilities.CurrentUserData.ConnectionString;
}
}
Since, the connection string is runtime data, you should not use it to construct your application components, as is described in this article. So as the article advices, you should hide the connection string behind a provider abstraction. For instance:
public interface IConnectionStringProvider {
string ConnectionString { get; }
}
This way your repositories can depend on IConnectionStringProvider and can call IConnectionStringProvider.ConnectionString at runtime:
public int Count()
{
string tableName = typeof(T).Name;
string query = SqlQueryConstants.SelectCount + SqlQueryConstants.Space + tableName;
return DbHelper.ExecuteScalar<int>(
this.connectionStringProvider.ConnectionString,
provider: provider, parameters: null);
}
It will be trivial to create an IConnectionStringProvider to will get the correct connection string for you:
class DatabaseConnectionStringProvider : IConnectionStringProvider
{
public string ConnectionString => Session["connectionString"];
}
Since this clas depends on application-specifics (the ASP.NET session in this case), the class should not be part of the application's core logic. Instead, this adapter should live in the application's start up path (a.k.a. the composition root, the place where you configure your container).
You might even want to consider not passing along the IConnectionStringProvider into your repositories, but instead create an abstraction that will create a connection itself. This will hide the fact that there is a connection string completely.
What you're looking for is multi tenancy. You can google "castle windsor multi tenancy" and find a number of useful articles.
Here's a similar Stackoverflow question that links to some good articles on Windsor and multi tenancy. In particular, look into Windsor's IHandlerSelector interface.
I structured my project into multiple mobile services, grouped by the application type eg:
my-core.azure-mobile.net (user, device)
my-app-A.azure-mobile.net (sales, order, invoice)
my-app-B.azure-mobile.net (inventory & parts)
I'm using custom authentication for all my services, and I implemented my own SSO by setting the same master key to all 3 services.
Things went well when I tested using REST client, eg. user who "logged in" via custom api at my-core.azure-mobile.net is able to use the returned JWT token to access restricted API of the other mobile services.
However, in my xamarin project, only the first (note, in sequence of creation) MobileServiceClient object is working properly (eg. returning results from given table). The client object are created using their own url and key respectively, and stored in a dictionary.
If i created client object for app-A then only create for app-B, I will be able to perform CRUD+Sync on sales/order/invoice entity, while CRUD+Sync operation on inventory/part entity will just hang there. The situation is inverse if I swap the client object creation order.
I wonder if there is any internal static variables used within the MobileServiceClient which caused such behavior, or it is a valid bug ?
=== code snippet ===
public class AzureService
{
IDictionary<String, MobileServiceClient> services = new Dictionary<String, MobileServiceClient>();
public MobileServiceClient Init (String key, String applicationURL, String applicationKey)
{
return services[key] = new MobileServiceClient (applicationURL, applicationKey);
}
public MobileServiceClient Get(String key)
{
return services [key];
}
public void InitSyncContext(MobileServiceSQLiteStore offlineStore)
{
// Uses the default conflict handler, which fails on conflict
// To use a different conflict handler, pass a parameter to InitializeAsync.
// For more details, see http://go.microsoft.com/fwlink/?LinkId=521416
var syncHandler = new MobileServiceSyncHandler ();
foreach(var client in services) {
client.Value.SyncContext.InitializeAsync (offlineStore, syncHandler);
}
}
public void SetAuthenticationToken(String uid, String token)
{
var user = new MobileServiceUser(uid);
foreach(var client in services) {
client.Value.CurrentUser = user;
client.Value.CurrentUser.MobileServiceAuthenticationToken = token;
}
}
public void ClearAuthenticationToken()
{
foreach(var client in services) {
client.Value.CurrentUser = null;
}
}
}
=== more code ===
public class DatabaseService
{
public static MobileServiceSQLiteStore LocalStore = null;
public static string Path { get; set; }
public static ISet<IEntityMappingProvider> Providers = new HashSet<IEntityMappingProvider> ();
public static void Init (String dbPath)
{
LocalStore = new MobileServiceSQLiteStore(dbPath);
foreach(var provider in Providers) {
var types = provider.GetSupportedTypes ();
foreach(var t in types) {
JObject item = null;
// omitted detail to create JObject using reflection on given type
LocalStore.DefineTable(tableName, item);
}
}
}
}
=== still code ===
public class AzureDataSyncService<T> : IAzureDataSyncService<T>
{
public MobileServiceClient ServiceClient { get; set; }
public virtual Task<List<T>> GetAll()
{
try
{
var theTable = ServiceClient.GetSyncTable<T>();
return theTable.ToListAsync();
}
catch (MobileServiceInvalidOperationException msioe)
{
Debug.WriteLine("GetAll<{0}> EXCEPTION TYPE: {1}, EXCEPTION:{2}", typeof(T).ToString(), msioe.GetType().ToString(), msioe.ToString());
}
catch (Exception e)
{
Debug.WriteLine("GetAll<{0}> EXCEPTION TYPE: {1}, EXCEPTION:{2}", typeof(T).ToString(), e.GetType().ToString(), e.ToString());
}
List<T> theCollection = Enumerable.Empty<T>().ToList();
return Task.FromResult(theCollection);
}
}
=== code ===
public class UserService : AzureDataSyncService<User>
{
}
public class PartService : AzureDataSyncService<Part>
{
}
const string coreApiURL = #"https://my-core.azure-mobile.net/";
const string coreApiKey = #"XXXXX";
const string invApiURL = #"https://my-inventory.azure-mobile.net/";
const string invApiKey = #"YYYYY";
public async void Foo ()
{
DatabaseService.Providers.Add (new CoreDataMapper());
DatabaseService.Providers.Add (new InvDataMapper ());
DatabaseService.Init (DatabaseService.Path);
var coreSvc = AzureService.Instance.Init ("Core", coreApiURL, coreApiKey);
var invSvc = AzureService.Instance.Init ("Inv", invApiURL, invApiKey);
AzureService.Instance.InitSyncContext (DatabaseService.LocalStore);
AzureService.Instance.SetAuthenticationToken("AAA", "BBB");
UserService.Instance.ServiceClient = coreSvc;
PartService.Instance.ServiceClient = invSvc;
var x = await UserService.GetAll(); // this will work
var y = await PartService.GetAll(); // but not this
}
It's ok to use multiple MobileServiceClient objects, but not with the same local database. The offline sync feature uses a particular system tables to keep track of table operations and errors, and it is not supported to use the same local store across multiple sync contexts.
I'm not totally sure why it is hanging in your test, but it's possible that there is a lock on the local database file and the other sync context is waiting to get access.
You should instead use different local database files for each service and doing push and pull on each sync context. With your particular example, you just need to move LocalStore out of DatabaseService and into a dictionary in AzureService.
In general, it seems like an unusual design to use multiple services from the same client app. Is there a particular reason that the services need to be separated from each other?
I have developed own idGenerator based on Hazelcast IdGenerator class (with storing each last_used_id into db). Now I want to run hazelcast cluster as a single java application and my web-application as other app (web-application restart shouldn't move id values to next block). I move MyIdGeneratorProxy and MyIdGeneratorService to new application, run it, run web-application as a hazelcast-client and get
IllegalArgumentException: No factory registered for service: ecs:impl:idGeneratorService
It was okay when client and server were the same application.
It seems it's unable to process without some clientProxy. I have compared IdGeneratorProxy and ClientIdGeneratorProxy and it looks the same. What is the idea? How to write client proxy for services? I have found no documentation yet. Is direction of investigations correct? I thought it is possible to divide hazelcast inner services (like a id generator service) and my business-processes. Should I store custom ClientProxy (for custom spi) in my web-application?
This is a demo how to create a client proxy, the missing part CustomClientProxy function call, is quit complicated(more like a server proxy,here is called ReadRequest, the server is called Operation), you can find a how AtomicLong implement.For every client proxy method you have to make a request.
#Test
public void client() throws InterruptedException, IOException
{
ClientConfig cfg = new XmlClientConfigBuilder("hazelcast-client.xml").build();
ServiceConfig serviceConfig = new ServiceConfig();
serviceConfig.setName(ConnectorService.NAME)
.setClassName(ConnectorService.class.getCanonicalName())
.setEnabled(true);
ProxyFactoryConfig proxyFactoryConfig = new ProxyFactoryConfig();
proxyFactoryConfig.setService(ConnectorService.NAME);
proxyFactoryConfig.setClassName(CustomProxyFactory.class.getName());
cfg.addProxyFactoryConfig(proxyFactoryConfig);
HazelcastInstance hz = HazelcastClient.newHazelcastClient(cfg);
Thread.sleep(1000);
for (int i = 0; i < 10; i++)
{
Connector c = hz.getDistributedObject(ConnectorService.NAME, "Connector:" + ThreadLocalRandom.current()
.nextInt(10000));
System.out.println(c.snapshot());
}
}
private static class CustomProxyFactory implements ClientProxyFactory
{
#Override
public ClientProxy create(String id)
{
return new CustomClientProxy(ConnectorService.NAME, id);
}
}
private static class CustomClientProxy extends ClientProxy implements Connector
{
protected CustomClientProxy(String serviceName, String objectName)
{
super(serviceName, objectName);
}
#Override
public ConnectorState snapshot()
{
return null;
}
#Override
public void loadState(ConnectorState state)
{
}
#Override
public boolean reconnect(HostNode node)
{
return false;
}
#Override
public boolean connect()
{
return false;
}
}
EDIT
In hazelcast the IdGenerate is implemented as a wrapper for AtomicLong, you should implement you IdGenerate by you own, instead of extend IdGenerate.
So you have to implement these(more like a todo list XD):
API
interface MyIdGenerate
Server
MyIdGenerateService
MyIdGenerateProxy
MyIdGenerateXXXOperation
Client
ClientMyIdGenerateFactory
ClientMyIdGenerateProxy
MyIdGenerateXXXRequest
I also made a sequence(same as IdGenerate) here, this is backed by zookeeper or redis,also it's easy to add a db backend,too.I will integrate to hazelcast if I got time.
I am using StackExchange.Redis client with Azure Redis Cache Service. Here is my class,
public class RedisCacheService : ICacheService
{
private readonly ISettings _settings;
private readonly IDatabase _cache;
public RedisCacheService(ISettings settings)
{
_settings = settings;
var connectionMultiplexer = ConnectionMultiplexer.Connect(settings.RedisConnection);
_cache = connectionMultiplexer.GetDatabase();
}
public bool Exists(string key)
{
return _cache.KeyExists(key);
}
public void Save(string key, string value)
{
var ts = TimeSpan.FromMinutes(_settings.CacheTimeout);
_cache.StringSet(key, value, ts);
}
public string Get(string key)
{
return _cache.StringGet(key);
}
public void Remove(string key)
{
// How to remove one
}
public void Clear()
{
// How to remove all
}
}
Update: From the help of Marc, Here is my final class
public class RedisCacheService : ICacheService
{
private readonly ISettings _settings;
private readonly IDatabase _cache;
private static ConnectionMultiplexer _connectionMultiplexer;
static RedisCacheService()
{
var connection = ConfigurationManager.AppSettings["RedisConnection"];
_connectionMultiplexer = ConnectionMultiplexer.Connect(connection);
}
public RedisCacheService(ISettings settings)
{
_settings = settings;
_cache = _connectionMultiplexer.GetDatabase();
}
public bool Exists(string key)
{
return _cache.KeyExists(key);
}
public void Save(string key, string value)
{
var ts = TimeSpan.FromMinutes(_settings.CacheTimeout);
_cache.StringSet(key, value, ts);
}
public string Get(string key)
{
return _cache.StringGet(key);
}
public void Remove(string key)
{
_cache.KeyDelete(key);
}
public void Clear()
{
var endpoints = _connectionMultiplexer.GetEndPoints(true);
foreach (var endpoint in endpoints)
{
var server = _connectionMultiplexer.GetServer(endpoint);
server.FlushAllDatabases();
}
}
}
Now I don't know how to remove all items or single item from redis cache.
To remove a single item:
_cache.KeyDelete(key);
To remove all involves the FLUSHDB or FLUSHALL redis command; both are available in StackExchange.Redis; but, for reasons discussed here, they are not on the IDatabase API (because: they affect servers, not logical databases).
As per the "So how do I use them?" on that page:
server.FlushDatabase(); // to wipe a single database, 0 by default
server.FlushAllDatabases(); // to wipe all databases
(quite possibly after using GetEndpoints() on the multiplexer)
I could not able to flush database in Azure Redis Cache, got this error:
This operation is not available unless admin mode is enabled: FLUSHDB
Instead iterate through all keys to delete:
var endpoints = connectionMultiplexer.GetEndPoints();
var server = connectionMultiplexer.GetServer(endpoints.First());
//FlushDatabase didn't work for me: got error admin mode not enabled error
//server.FlushDatabase();
var keys = server.Keys();
foreach (var key in keys)
{
Console.WriteLine("Removing Key {0} from cache", key.ToString());
_cache.KeyDelete(key);
}
Both answers by #Rasi and #Marc Gravell contain pieces of code needed.
Based on above, here is working snippet assuming there is just 1 server:
You need to connect to redis with allowAdmin=true, one way to obtain such options is to assign AllowAdmin to already parsed string:
var options = ConfigurationOptions.Parse("server:6379");
options.AllowAdmin = true;
var redis = ConnectionMultiplexer.Connect(options);
Then to flush all databases:
var endpoints = redis.GetEndPoints();
var server = redis.GetServer(endpoints[0]);
server.FlushAllDatabases();
Above will work on any redis deployment, not just Azure.
You can delete hash as well ie if you want to clear specific value from any cached list.
For example, we have an emp list and inside with different department as cached.
public static void DeleteHash(string key, string cacheSubKey)
{
if (string.IsNullOrEmpty(key))
throw new ArgumentNullException("key");
Cache.HashDelete(key, cacheSubKey);
}
so you can pass Key name and cache subkey as well.
I was trying to use the cool Insight.Database micro ORM and run into a Not Implemeneted exception everytime I try to invoke the InsertCustomer method in the CustomerRepository.Any help would be appreciated
Update: I made sure that the method name matches the sql server stored procedure name
public class CustomerRepository
{
private ICustomerRepository _repo;
public static async Task<int> InsertCustomer(Customer cust)
{
var _repo = ConfigSettings.CustomerRepository;
return await _repo.InsertCustomer(cust);
}
}
public class ConfigSettings
{
private static ICustomerRepository _customerRepository;
public static ICustomerRepository CustomerRepository
{
get
{
if (_customerRepository == null)
{
_customerRepository = new SqlConnection(ConfigurationManager.ConnectionStrings["CustomerService_Conn_String"].ConnectionString).AsParallel<ICustomerRepository>();
}
return _customerRepository;
}
}
}
[Sql(Schema="dbo")]
public interface ICustomerRepository
{
[Sql("dbo.InsertCustomer")]
Task<int> InsertCustomer(Customer cust);
}
If you're getting a NotImplementedException, and running v4.1.0 to 4.1.3 you're probably running into a problem registering your database provider.
I recommend using v4.1.4 or later and making sure you register the provider for your database.
See
https://github.com/jonwagner/Insight.Database/wiki/Installing-Insight
If you have any more problems, you can post an issue on github.