//修改资源数
public bool modifyRes(List <Int32> newRes)
{
if (newRes.Count != resCount.columnNum)
{
return(false);
}
//TODO: 判断是否超出了一些进程的Max
if (isOverFlow(newRes))
{
LogoutEventArgs e = new LogoutEventArgs("error: 修改后不能满足某些进程的max最大需求.");
Logout.NewMsg(e);
return(false);
}
//修改Available,先计算出当前的已分配的资源向量，再进行向量加减
List <int> allocationList = getAllocationList();
List <int> result = new List <int>();
for (int i = 0; i < resNum; i++)
{
result.Add(0);
}
BankerHelper.VectorRed(newRes, allocationList, ref result);
available.modify(result);
resCount.modify(newRes);
return(true);
}
private void bt_rsRequest_Click(object sender, RoutedEventArgs e)
{
if (banker.applyForRes(cb_progName.Text, requestManager.getVector()))
{
LogoutEventArgs a = new LogoutEventArgs("success: 申请资源成功.");
Logout.NewMsg(a);
}
else
{
LogoutEventArgs a = new LogoutEventArgs("申请资源失败.");
Logout.NewMsg(a);
}
}
private void bt_addRes_Click(object sender, RoutedEventArgs e)
{
if (banker.getResNum() >= 26)
{
LogoutEventArgs a = new LogoutEventArgs("error: 最多支持26个种类的资源");
Logout.NewMsg(a);
return;
}
newProgMax.newColumn();
request.newColumn();
banker.newRes();
tb_resCount.Text = ((Convert.ToInt32(tb_resCount.Text) + 1).ToString());
}
private void bt_updateAvaliable_Click(object sender, RoutedEventArgs e)
{
List <int> newRes = resCountManager.getVector();
if (banker.modifyRes(newRes))
{
LogoutEventArgs a = new LogoutEventArgs("success: 资源已更新.");
Logout.NewMsg(a);
}
else
{
LogoutEventArgs a = new LogoutEventArgs("error: 资源更新失败.");
Logout.NewMsg(a);
}
}
private void newProgress_Click(object sender, RoutedEventArgs e)
{
if (tb_newProgName.Text == "")
{
LogoutEventArgs a = new LogoutEventArgs("error: 进程名为空");
Logout.NewMsg(a);
return;
}
List <int> progMax = newProgMaxManager.getVector();
if (banker.newProgress(tb_newProgName.Text, progMax))
{
cb_progName.ItemsSource = null;
cb_progName.ItemsSource = banker.getProgressNameList();
tb_progressNum.Text = ((Convert.ToInt32(tb_progressNum.Text) + 1).ToString());
tb_newProgName.Clear();
}
}
public bool applyForRes(string name, List <int> request)
{
//清空workAllocation
workAllocation.clearAll();
List <string> safetyList = bankerAlg(name, request);
if (safetyList != null)
{
StringBuilder sb = new StringBuilder("安全序列：{");
foreach (string i in safetyList)
{
sb.Append(i + ",");
}
sb.Remove(sb.Length - 1, 1);
sb.Append("}");
LogoutEventArgs e = new LogoutEventArgs(sb.ToString());
Logout.NewMsg(e);
return(true);
}
return(false);
}
public virtual bool newRow(string header)
{
if (progressName.Contains(header))
{
LogoutEventArgs e = new LogoutEventArgs("error: 已存在同名进程，创建失败.");
Logout.NewMsg(e);
return(false);
}
else
{
progressName.Add(header);
List <Int32> t = new List <int>();
for (int i = 0; i < columnNum; i++)
{
t.Add(0);
}
data.Add(t);
row++;
onDataChanged(null);
return(true);
}
}
public bool newProgress(string name, List <int> vector)
{
//判断是否超过resCount向量,若超过，返回false报错
List <int> resCountList = resCount.getDataList();
if (!BankerHelper.VectorLess(vector, resCountList))
{
LogoutEventArgs e = new LogoutEventArgs("error: 新建进程的最大需求资源数超过最大资源数.");
Logout.NewMsg(e);
return(false);
}
if (max.newRow(name))
{
//修改max
max.modify(name, vector);
need.newRow(name);
allocation.newRow(name);
//增加进程数
progNum++;
//计算need矩阵的值
List <List <Int32> > t = new List <List <int> >();
for (int i = 0; i < progNum; i++)
{
t.Add(new List <int>());
for (int j = 0; j < resNum; j++)
{
t[i].Add(0);
}
}
BankerHelper.MatrixRed(max.getData(), allocation.getData(), ref t);
need.modify(t);
return(true);
}
return(false);
}
//银行家算法
private List <string> bankerAlg(string name, List <int> request)
{
//备份数据
List <List <int> > allocationBackup, needBackup;
List <int> availBackup;
availBackup = available.getDataList();
allocationBackup = allocation.getData();
needBackup = need.getData();
//如果Request大于need，报错
if (BankerHelper.VectorLess(request, need.getVector(name)))
{
if (BankerHelper.VectorLess(request, available.getDataList()))
{
//尝试赋值
List <int> newAvail = available.getDataList();
BankerHelper.VectorRed(available.getDataList(), request, ref newAvail);
available.modify(newAvail);
List <int> newAllocation = allocation.getVector(name);
BankerHelper.VectorAdd(allocation.getVector(name), request, ref newAllocation);
allocation.modify(name, newAllocation);
List <int> newNeed = need.getVector(name);
BankerHelper.VectorRed(need.getVector(name), request, ref newNeed);
need.modify(name, newNeed);
//进行安全性检测
List <string> safetyList = safetyAlg(request);
if (safetyList == null)
{
//恢复数据
LogoutEventArgs a = new LogoutEventArgs("error: 找不到合适的安全序列.");
Logout.NewMsg(a);
//恢复数据
available.modify(availBackup);
allocation.modify(allocationBackup);
need.modify(needBackup);
}
return(safetyList);
}
else
{
LogoutEventArgs a = new LogoutEventArgs("error: 尚无足够资源，需要等待.");
Logout.NewMsg(a);
//恢复数据
available.modify(availBackup);
allocation.modify(allocationBackup);
need.modify(needBackup);
return(null);
}
}
else
{
LogoutEventArgs a = new LogoutEventArgs("error: 申请的资源数已超过其宣布的最大值(need).");
Logout.NewMsg(a);
//恢复数据
available.modify(availBackup);
allocation.modify(allocationBackup);
need.modify(needBackup);
}
return(null);
}
