/// <summary>
/// Process the messages received from the KCD, if any.
/// </summary>
private static void ProcessKcdMessages()
{
// If we were not notified, bail out quickly.
if (!WmKcdState.EventFlag)
{
return;
}
// Clear the notification flag.
WmKcdState.EventFlag = false;
// Get the messages.
List <KcdControlMsg> controlList = new List <KcdControlMsg>();
List <KcdAnpMsg> anpList = new List <KcdAnpMsg>();
Wm.KcdBroker.GetMessagesForWm(out controlList, out anpList);
KLogging.Log("ProcessKcdMessages(), anpList.Count = " + anpList.Count);
// Process the messages.
foreach (KcdControlMsg m in controlList)
{
ProcessKcdControlMsg(m);
}
foreach (KcdAnpMsg m in anpList)
{
ProcessKcdAnpMsg(m);
}
}
/// <summary>
/// This method is called when the workspace manager has stopped.
/// The WM is serialized and the application is told to quit.
/// </summary>
private static void HandlePostStop()
{
KLogging.Log("WmSm: " + KwmStrings.Kwm + " has stopped.");
Wm.MainStatus = WmMainStatus.Stopped;
Wm.Serialize();
Program.RequestAppExit();
}
/// <summary>
/// Upgrade the database schema if required.
/// </summary>
private void UpgradeDb(UInt32 version)
{
KLogging.Log("Upgrading database schema from version " + version);
m_db.BeginTransaction();
UpdateDbVersion(LatestDbVersion);
m_db.CommitTransaction();
}
/// <summary>
/// Process an ANP message received from the KCD.
/// </summary>
private static void ProcessKcdAnpMsg(KcdAnpMsg m)
{
KLogging.Log("ProcessKcdAnpMsg() called");
// We're stopping. Bail out.
if (StopFlag)
{
return;
}
// The KCD specified does not exist. Bail out.
if (!Wm.KcdTree.ContainsKey(m.KcdID))
{
return;
}
// The KCD is not connected. Bail out.
WmKcd kcd = Wm.KcdTree[m.KcdID];
if (kcd.ConnStatus != KcdConnStatus.Connected)
{
return;
}
// Process the message according to its type.
try
{
if (m.Msg.Type == KAnp.KANP_RES_FAIL && m.Msg.Elements[0].UInt32 == KAnp.KANP_RES_FAIL_BACKEND)
{
throw new Exception("backend error: " + m.Msg.Elements[1].String);
}
else if (m.IsReply())
{
ProcessKcdAnpReply(kcd, m.Msg);
}
else if (m.IsEvent())
{
ProcessKcdAnpEvent(kcd, m.Msg);
}
else
{
throw new Exception("received unexpected ANP message type (" + m.Msg.Type + ")");
}
}
catch (Exception ex)
{
HandleTroublesomeKcd(kcd, ex);
}
}
/// <summary>
/// Create the initial database schema.
/// </summary>
private void CreateSchema()
{
KLogging.Log("Creating database schema.");
m_db.BeginTransaction();
String s =
"CREATE TABLE 'db_version' ('version' INT PRIMARY KEY); " +
"INSERT INTO db_version (version) VALUES (" + LatestDbVersion + "); " +
"CREATE TABLE 'serialization' ('name' VARCHAR PRIMARY KEY, 'data' BLOB); " +
"CREATE TABLE 'kws_list' ('kws_id' INT PRIMARY KEY, 'name' VARCHAR); " +
"CREATE TABLE 'kanp_events' ('kws_id' INT, 'evt_id' INT, 'evt_data' BLOB, 'status' INT); " +
"CREATE TABLE 'eanp_events' ('kws_id' INT, 'evt_id' INT, 'uuid' BLOB, 'evt_data' BLOB); " +
"CREATE UNIQUE INDEX 'kanp_events_index_1' ON 'kanp_events' ('kws_id', 'evt_id'); " +
"CREATE UNIQUE INDEX 'kanp_events_index_2' ON 'kanp_events' ('kws_id', 'status', 'evt_id'); " +
"CREATE UNIQUE INDEX 'eanp_events_index_1' ON 'eanp_events' ('kws_id', 'evt_id'); ";
m_db.ExecNQ(s);
m_db.CommitTransaction();
}
/// <summary>
/// Run once through the bowels of the state machine.
/// </summary>
private static void RunPass()
{
// Reset the next run date to the maximum. During the processing of this
// method, the next run date will lower itself as needed.
m_nextRunDate = DateTime.MaxValue;
// We're stopped, nothing to do.
if (Wm.MainStatus == WmMainStatus.Stopped)
{
KLogging.Log("WmSm: " + KwmStrings.Kwm + " is stopped, nothing to do.");
}
// Try to stop.
else if (Wm.MainStatus == WmMainStatus.Stopping && TryStop())
{
HandlePostStop();
}
// Perform regular processing.
else
{
// Serialize the WM if needed.
SerializeWmIfNeeded();
// Process the workspace state machines.
ProcessKwsStateMachines();
// Process the workspaces to remove.
ProcessKwsToRemove();
// Process the KCDs state changes.
ProcessKcdState();
// Recompute the KCD event processing quench.
RecomputeKcdQuenching();
// Process the KCD messages.
ProcessKcdMessages();
}
}
/// <summary>
/// Run the workspace manager state machine.
/// </summary>
private static void Run(String who)
{
KLogging.Log("WmSm: Run() called by " + who);
try
{
// Avoid reentrance.
if (m_runningFlag)
{
KLogging.Log("WmSm: already running, bailing out.");
return;
}
m_runningFlag = true;
// Loop until our state stabilize.
LockNotif();
while (WantToRunNow())
{
RunPass();
}
UnlockNotif();
// Schedule the next timer event appropriately.
ScheduleTimerEvent();
// We're no longer running the WM.
m_runningFlag = false;
}
// We cannot recover from these errors.
catch (Exception ex)
{
KBase.HandleException(ex, true);
}
}
