public DelayTable GetTable(string strDatabaseName, string strTableName)
{
if (this.m_lock.TryEnterWriteLock(this.m_nLockTimeout) == false)
{
throw new ApplicationException("为 DelayTableCollection 加写锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
}
try
{
string strName = strDatabaseName + "." + strTableName;
DelayTable table = (DelayTable)name_table[strName];
if (table == null)
{
table = new DelayTable();
table.DatabaseName = strDatabaseName;
table.TableName = strTableName;
name_table[strName] = table;
}
return(table);
}
finally
{
this.m_lock.ExitWriteLock();
}
}
public List <DelayTable> GetTables(string strDatabaseName)
{
if (this.m_lock.TryEnterReadLock(this.m_nLockTimeout) == false)
{
throw new ApplicationException("为 DelayTableCollection 加读锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
}
try
{
List <DelayTable> results = new List <DelayTable>();
foreach (string key in this.name_table.Keys)
{
DelayTable table = (DelayTable)name_table[key];
if (table.DatabaseName == strDatabaseName)
{
results.Add(table);
}
}
return(results);
}
finally
{
this.m_lock.ExitReadLock();
}
}
public void Remove(DelayTable table)
{
if (this.m_lock.TryEnterWriteLock(this.m_nLockTimeout) == false)
throw new ApplicationException("为 DelayTableCollection 加写锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
try
{
foreach (string key in this.name_table.Keys)
{
DelayTable current = (DelayTable)name_table[key];
if (current == table)
{
this.name_table.Remove(key);
return;
}
}
}
finally
{
this.m_lock.ExitWriteLock();
}
}
public void Remove(DelayTable table)
{
if (this.m_lock.TryEnterWriteLock(this.m_nLockTimeout) == false)
{
throw new ApplicationException("为 DelayTableCollection 加写锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
}
try
{
foreach (string key in this.name_table.Keys)
{
DelayTable current = (DelayTable)name_table[key];
if (current == table)
{
this.name_table.Remove(key);
return;
}
}
}
finally
{
this.m_lock.ExitWriteLock();
}
}
public void Free()
{
if (this.m_lock.TryEnterWriteLock(this.m_nLockTimeout) == false)
{
throw new ApplicationException("为 DelayTableCollection 加写锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
}
try
{
foreach (string key in this.name_table.Keys)
{
DelayTable table = (DelayTable)this.name_table[key];
if (table != null)
{
table.Free();
}
}
this.name_table.Clear();
}
finally
{
this.m_lock.ExitWriteLock();
}
}
public DelayTable GetTable(string strDatabaseName, string strTableName)
{
if (this.m_lock.TryEnterWriteLock(this.m_nLockTimeout) == false)
throw new ApplicationException("为 DelayTableCollection 加写锁时失败。Timeout=" + this.m_nLockTimeout.ToString());
try
{
string strName = strDatabaseName + "." + strTableName;
DelayTable table = (DelayTable)name_table[strName];
if (table == null)
{
table = new DelayTable();
table.DatabaseName = strDatabaseName;
table.TableName = strTableName;
name_table[strName] = table;
}
return table;
}
finally
{
this.m_lock.ExitWriteLock();
}
}
// return:
// -1 出错
// 0 成功
public int Write(
string strDatabaseName,
KeyCollection keys,
delegate_getfilename getfilename,
out string strError)
{
strError = "";
// 确保 keys 里面的事项是排序过的。如果没有排序，本函数也能工作，只是效率略低
DelayTable table = null;
KeyCollection part_keys = new KeyCollection();
foreach (KeyItem item in keys)
{
if (table == null)
{
table = GetTable(strDatabaseName, item.SqlTableName);
if (string.IsNullOrEmpty(table.FileName) == true)
{
string strFilename = getfilename(strDatabaseName, item.SqlTableName);
int nRet = table.Create(strFilename, out strError);
if (nRet == -1)
{
return(-1);
}
}
}
else
{
if (table.TableName != item.SqlTableName)
{
if (part_keys.Count > 0)
{
table.Write(part_keys);
part_keys.Clear();
}
table = GetTable(strDatabaseName, item.SqlTableName);
if (string.IsNullOrEmpty(table.FileName) == true)
{
string strFilename = getfilename(strDatabaseName, item.SqlTableName);
int nRet = table.Create(strFilename, out strError);
if (nRet == -1)
{
return(-1);
}
}
}
}
part_keys.Add(item);
}
if (part_keys.Count > 0)
{
Debug.Assert(table != null, "");
table.Write(part_keys);
part_keys.Clear();
}
return(0);
}
