如何重用重新打开连接的代码? [英] How to reuse code that reopens connection?
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问题描述
我们的生产服务器会终止不活动的连接,因此我们的 API 需要在需要时恢复它们.以下代码有效,但非常重复:
Our production server kills inactive connections, so our API needs to restore them when they are needed. The following code works, but it is very repetitive:
private const int MaxRetryCount = 3;
public static SqlDataReader RestoreConnectionAndExecuteReader(SqlCommand command)
{
int retryCount = 0;
while (retryCount++ < MaxRetryCount)
{
try
{
if (command.Connection.State == ConnectionState.Closed)
command.Connection.Open();
return command.ExecuteReader();
}
catch(Exception e)
{
if(!e.Message.ToLower().Contains("transport-level error has occurred"))
{
throw;
}
}
}
throw new Exception("Failed to restore connection for command:"+command.CommandText);
}
public static void RestoreConnectionAndExecuteNonQuery(SqlCommand command)
{
var retryCount = 0;
while(retryCount++ < MaxRetryCount)
{
try
{
if (command.Connection.State == ConnectionState.Closed)
command.Connection.Open();
command.ExecuteNonQuery();
return;
}
catch(Exception e)
{
if (!e.Message.ToLower().Contains("transport-level error has occurred"))
{
throw;
}
}
}
throw new Exception("Failed to restore connection for command:" + command.CommandText);
}
如何重构我的代码并消除重复?我需要保留这些方法的签名,因为它们在整个系统中使用.
How could I refactor my code and eliminate duplication? I need to keep the signatures of these methods, as they are used all over the system.
推荐答案
private const int MaxRetryCount = 3;
public static T RestoreConnectionAndExecute<T>(SqlCommand command, Func<SqlCommand, T> func)
{
int retryCount = 0;
while (retryCount++ < MaxRetryCount)
{
try
{
if (command.Connection.State == ConnectionState.Closed)
command.Connection.Open();
return func(command);
}
catch(Exception e)
{
if(!e.Message.ToLower().Contains("transport-level error has occurred"))
{
throw;
}
}
}
throw new Exception("Failed to restore connection for command:"+command.CommandText);
}
public static SqlDataReader RestoreConnectionAndExecuteReader(SqlCommand command)
{
return RestoreConnectionAndExecute(command, c => c.ExecuteReader());
}
public static int RestoreConnectionAndExecuteNonQuery(SqlCommand command)
{
return RestoreConnectionAndExecute(command, c => c.ExecuteNonQuery());
}
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