/// <summary>
/// 创建一个新的事务
/// </summary>
/// <param name="role">针对的服务角色</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public BusinessMessageTransaction CreateTransaction(string role)
{
if (string.IsNullOrEmpty(role))
{
throw new ArgumentNullException("role");
}
string errMsg;
IServerConnectionAgent <BaseMessage> agent = _clsuter.GetChannel(role, _protocolStacks[role], out errMsg);
return(agent == null
? new FailMobiSageMessageTransaction(errMsg)
: _transactionManager.Create(IdentityHelper.Create((IPEndPoint)agent.GetChannel().LocalEndPoint), agent.GetChannel()));
}
/// <summary>
/// 创建一个新的事务
/// </summary>
/// <returns>返回新创建的事务</returns>
/// <exception cref="ArgumentNullException">参数错误</exception>
public MessageTransaction <BaseMessage> CreateTransaction()
{
return(_transactionManager.Create(IdentityHelper.Create(_channel.LocalEndPoint, _channel.ChannelType), _channel));
}
/// <summary>
/// 获取某个字段的值
/// </summary>
/// <typeparam name="T">字段类型</typeparam>
/// <param name="database">数据库名</param>
/// <param name="table">表名</param>
/// <param name="service">服务名称</param>
/// <param name="field">字段名</param>
/// <returns>返回相应字段的值</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public string GetField(string database, string table, string service, string field)
{
string result = null;
#region Get cache first.
Dictionary <string, string> items;
//has cache.
if (_cacheKeys.TryGetValue(service, out items))
{
return(items.TryGetValue(field, out result) ? result : null);
}
#endregion
PrepareConnection();
#region Get remote config.
Exception exception = null;
CSNGetKeyDataRequestMessage requestMessage = new CSNGetKeyDataRequestMessage();
requestMessage.DatabaseName = database;
requestMessage.TableName = table;
requestMessage.ServiceName = service;
BusinessMessageTransaction transaction = _transactionManager.Create(IdentityHelper.Create((IPEndPoint)_channel.LocalEndPoint), _channel);
if (transaction == null)
{
throw new Exception("Cannot create a CSN message transaction!");
}
AutoResetEvent autoResetEvent = new AutoResetEvent(false);
transaction.ResponseArrived += delegate(object sender, LightSingleArgEventArgs <BaseMessage> e)
{
CSNGetKeyDataResponseMessage rspMessage = (CSNGetKeyDataResponseMessage)e.Target;
#region Add Cache.
Dictionary <string, string> values = new Dictionary <string, string>();
if (rspMessage.Items != null)
{
foreach (KeyValueItem item in rspMessage.Items)
{
values.Add(item.Key, item.Value);
}
_cacheKeys.Add(service, values);
}
//get result.
result = values.ContainsKey(field) ? values[field] : null;
#endregion
autoResetEvent.Set();
};
transaction.Failed += delegate
{
_transactionManager.Remove(transaction.Identity);
exception = new Exception("Failed! Cannot get key data config from CSN service, #key: " + field);
autoResetEvent.Set();
};
transaction.Timeout += delegate
{
_transactionManager.Remove(transaction.Identity);
exception = new Exception("Timeout! Cannot get key data config from CSN service, #key: " + field);
autoResetEvent.Set();
};
transaction.SendRequest(requestMessage);
//wait 35s.
autoResetEvent.WaitOne(35000);
autoResetEvent.Dispose();
if (exception != null)
{
throw exception;
}
#endregion
return(result);
}