/// <summary>
/// Runs the method, specified by method, on the server specified by i, with parameters given by parameters.
/// Correctly handles exceptions thrown in the running of that method, and bool and BufferGenerationStatus
/// type return values from the server.
/// </summary>
/// <param name="method"></param>
/// <param name="i"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public ServerActionStatus runMethodOnServer(MethodInfo method, ServerInfo i, object[] parameters, int msTimeout, EventHandler<MessageEvent> messageLog)
{
if (verifyConnection(i) == ServerActionStatus.Failed_No_Connection)
return ServerActionStatus.Failed_No_Connection;
ServerCommunicator communicator = communicators[i];
Object returnValue;
try
{
InvokeMethodOnServer_Parameters invoke_parameters = new InvokeMethodOnServer_Parameters(method, parameters, communicator);
Thread invokeMethodThread = new Thread(new ParameterizedThreadStart(InvokeMethodOnServer_Proc));
invokeMethodThread.Start(invoke_parameters);
// invokeMethodThread.Join(msTimeout);
invokeMethodThread.Join();
if (invokeMethodThread.ThreadState == ThreadState.Running)
{
invokeMethodThread.Abort();
throw new Exception("Method on server " + i.ToString() + "." + method.Name + " took longer than " + msTimeout + " ms timeout. Aborting.");
}
returnValue = invoke_parameters.returnValue;
if (invoke_parameters.runException != null)
{
throw new Exception("Caught an exception when attempting to run method " + i.ToString() + "." + method.Name+ ": " + invoke_parameters.runException.Message);
}
}
catch (Exception e)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Caught exception when attempting to run method on server " + i.ToString() + ": " + e.Message + e.StackTrace));
serverGotDisconnectedInError(i);
return ServerActionStatus.Failed_Loss_Of_Connection;
}
if (returnValue is bool)
{
bool attempt = (bool) returnValue;
if (attempt)
return ServerActionStatus.Success;
return ServerActionStatus.Failed_On_Server;
}
else if (returnValue is ServerCommunicator.BufferGenerationStatus)
{
ServerCommunicator.BufferGenerationStatus bufferStatus = (ServerCommunicator.BufferGenerationStatus) returnValue;
if (bufferStatus == ServerCommunicator.BufferGenerationStatus.Success)
return ServerActionStatus.Success;
return ServerActionStatus.Failed_On_Server;
}
return ServerActionStatus.Success;
}
public bool pingServer(ServerInfo server, EventHandler<MessageEvent> messageLog)
{
if (!communicators.ContainsKey(server))
{
if (messageLog != null)
messageLog(this, new MessageEvent("Attempted to ping unconnected server " + server.ToString()));
return false;
}
ServerCommunicator comm = communicators[server];
if (comm == null)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Server communication object is null, unable to ping server " + server.ToString()));
return false;
}
try
{
Thread pingThread = new Thread(new ParameterizedThreadStart(ping_server_proc));
pingThread.Start(comm);
pingThread.Join(1000);
if (pingThread.ThreadState == ThreadState.Running)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Server ping took longer than 1000ms. Aborting."));
pingThread.Abort();
return false;
}
}
catch (Exception e)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Caught exception when attempting to ping server " + server.ToString() + ": " + e.Message + e.StackTrace));
return false;
}
return true;
}
public bool connectServer(ServerInfo server, EventHandler<MessageEvent> messageLog)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Attempting to connect server " + server.ToString()));
bool gotLock = Monitor.TryEnter(lockObj, 1000);
try
{
if (!gotLock)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Unable to obtain lock on servermanager. Aborting attempt."));
return false;
}
// Cannot connect to a server that isn't is the servers list.
if (!servers.Contains(server))
{
if (messageLog != null)
messageLog(this, new MessageEvent(server.ToString() + " is not on list of known servers. Aborting."));
return false;
}
// ensure that this server has a server connection status item
if (!connections.ContainsKey(server))
{
connections.Add(server, ConnectionStatus.Disconnected_Normal);
}
// if this server is disabled, then don't connect to it.
if (!server.ServerEnabled)
{
if (messageLog != null)
messageLog(this, new MessageEvent(server.ToString() + " is not enabled. Aborting."));
return false;
}
// set server status to connecting. If the server already was connecting, then return.
if (connections[server] == ConnectionStatus.Connecting)
{
if (messageLog != null)
messageLog(this, new MessageEvent(server.ToString() + " is already connecting. Aborting."));
return false;
}
connections[server] = ConnectionStatus.Connecting;
// create an empty spot for the server communicator
if (!communicators.ContainsKey(server))
{
communicators.Add(server, null);
}
communicators[server] = null;
// try to create the communicator
try
{
Thread connectThread = new Thread(new ParameterizedThreadStart(server_connect_proc));
connectThread.Start(server);
connectThread.Join(1000);
if (connectThread.ThreadState == ThreadState.Running)
{
connectThread.Abort();
if (messageLog != null)
messageLog(this, new MessageEvent("Connection took longer than 1000 ms, aborting."));
connectThread.Abort();
return false;
}
}
catch (Exception e)
{
if (messageLog != null)
messageLog(this, new MessageEvent("Caught exception when attempting to connect to server " + server.ToString() + ":" + e.Message + e.StackTrace));
connections[server] = ConnectionStatus.Unable_To_Connect;
return false;
}
try
{
if (pingServer(server, messageLog))
{
server.setServerName(communicators[server].getServerName());
if (connectedServerNames.Contains(server.ServerName))
{
connections[server] = ConnectionStatus.Error_Name_Not_Unique;
communicators.Remove(server);
return false;
}
connectedServerNames.Add(server.ServerName);
connections[server] = ConnectionStatus.Connected;
messageLog(this, new MessageEvent("Server connected successfully."));
return true;
}
else
{
if (messageLog != null)
messageLog(this, new MessageEvent("Server ping failed. Aborting."));
connections[server] = ConnectionStatus.Unable_To_Connect;
return false;
}
}
catch (Exception e)
{
messageLog(this, new MessageEvent("Exception when attempting to ping server: " + e.Message + e.StackTrace));
connections[server] = ConnectionStatus.Unable_To_Connect;
return false;
}
}
finally
{
if (gotLock)
Monitor.Exit(lockObj);
}
return true;
}
/// <summary>
/// Runs the method, specified by method, on the server specified by i, with parameters given by parameters.
/// Correctly handles exceptions thrown in the running of that method, and bool and BufferGenerationStatus
/// type return values from the server.
/// </summary>
/// <param name="method"></param>
/// <param name="i"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public ServerActionStatus runMethodOnServer(MethodInfo method, ServerInfo i, object[] parameters, int msTimeout, EventHandler <MessageEvent> messageLog)
{
if (verifyConnection(i) == ServerActionStatus.Failed_No_Connection)
{
return(ServerActionStatus.Failed_No_Connection);
}
ServerCommunicator communicator = communicators[i];
Object returnValue;
try
{
InvokeMethodOnServer_Parameters invoke_parameters = new InvokeMethodOnServer_Parameters(method, parameters, communicator);
Thread invokeMethodThread = new Thread(new ParameterizedThreadStart(InvokeMethodOnServer_Proc));
invokeMethodThread.Start(invoke_parameters);
// invokeMethodThread.Join(msTimeout);
invokeMethodThread.Join();
if (invokeMethodThread.ThreadState == ThreadState.Running)
{
invokeMethodThread.Abort();
throw new Exception("Method on server " + i.ToString() + "." + method.Name + " took longer than " + msTimeout + " ms timeout. Aborting.");
}
returnValue = invoke_parameters.returnValue;
if (invoke_parameters.runException != null)
{
throw new Exception("Caught an exception when attempting to run method " + i.ToString() + "." + method.Name + ": " + invoke_parameters.runException.Message);
}
}
catch (Exception e)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Caught exception when attempting to run method on server " + i.ToString() + ": " + e.Message + e.StackTrace));
}
serverGotDisconnectedInError(i);
return(ServerActionStatus.Failed_Loss_Of_Connection);
}
if (returnValue is bool)
{
bool attempt = (bool)returnValue;
if (attempt)
{
return(ServerActionStatus.Success);
}
return(ServerActionStatus.Failed_On_Server);
}
else if (returnValue is ServerCommunicator.BufferGenerationStatus)
{
ServerCommunicator.BufferGenerationStatus bufferStatus = (ServerCommunicator.BufferGenerationStatus)returnValue;
if (bufferStatus == ServerCommunicator.BufferGenerationStatus.Success)
{
return(ServerActionStatus.Success);
}
return(ServerActionStatus.Failed_On_Server);
}
return(ServerActionStatus.Success);
}
public bool pingServer(ServerInfo server, EventHandler <MessageEvent> messageLog)
{
if (!communicators.ContainsKey(server))
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Attempted to ping unconnected server " + server.ToString()));
}
return(false);
}
ServerCommunicator comm = communicators[server];
if (comm == null)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Server communication object is null, unable to ping server " + server.ToString()));
}
return(false);
}
try
{
Thread pingThread = new Thread(new ParameterizedThreadStart(ping_server_proc));
pingThread.Start(comm);
pingThread.Join(3000);
if (pingThread.ThreadState == ThreadState.Running)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Server ping took longer than 1000ms. Aborting."));
}
pingThread.Abort();
return(false);
}
}
catch (Exception e)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Caught exception when attempting to ping server " + server.ToString() + ": " + e.Message + e.StackTrace));
}
return(false);
}
return(true);
}
public bool connectServer(ServerInfo server, EventHandler <MessageEvent> messageLog)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Attempting to connect server " + server.ToString()));
}
bool gotLock = Monitor.TryEnter(lockObj, 1000);
try
{
if (!gotLock)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Unable to obtain lock on servermanager. Aborting attempt."));
}
return(false);
}
// Cannot connect to a server that isn't is the servers list.
if (!servers.Contains(server))
{
if (messageLog != null)
{
messageLog(this, new MessageEvent(server.ToString() + " is not on list of known servers. Aborting."));
}
return(false);
}
// ensure that this server has a server connection status item
if (!connections.ContainsKey(server))
{
connections.Add(server, ConnectionStatus.Disconnected_Normal);
}
// if this server is disabled, then don't connect to it.
if (!server.ServerEnabled)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent(server.ToString() + " is not enabled. Aborting."));
}
return(false);
}
// set server status to connecting. If the server already was connecting, then return.
if (connections[server] == ConnectionStatus.Connecting)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent(server.ToString() + " is already connecting. Aborting."));
}
return(false);
}
connections[server] = ConnectionStatus.Connecting;
// create an empty spot for the server communicator
if (!communicators.ContainsKey(server))
{
communicators.Add(server, null);
}
communicators[server] = null;
// try to create the communicator
try
{
Thread connectThread = new Thread(new ParameterizedThreadStart(server_connect_proc));
connectThread.Start(server);
connectThread.Join(1000);
if (connectThread.ThreadState == ThreadState.Running)
{
connectThread.Abort();
if (messageLog != null)
{
messageLog(this, new MessageEvent("Connection took longer than 1000 ms, aborting."));
}
connectThread.Abort();
return(false);
}
}
catch (Exception e)
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Caught exception when attempting to connect to server " + server.ToString() + ":" + e.Message + e.StackTrace));
}
connections[server] = ConnectionStatus.Unable_To_Connect;
return(false);
}
try
{
if (pingServer(server, messageLog))
{
server.setServerName(communicators[server].getServerName());
if (connectedServerNames.Contains(server.ServerName))
{
connections[server] = ConnectionStatus.Error_Name_Not_Unique;
communicators.Remove(server);
return(false);
}
connectedServerNames.Add(server.ServerName);
connections[server] = ConnectionStatus.Connected;
messageLog(this, new MessageEvent("Server connected successfully."));
return(true);
}
else
{
if (messageLog != null)
{
messageLog(this, new MessageEvent("Server ping failed. Aborting."));
}
connections[server] = ConnectionStatus.Unable_To_Connect;
return(false);
}
}
catch (Exception e)
{
messageLog(this, new MessageEvent("Exception when attempting to ping server: " + e.Message + e.StackTrace));
connections[server] = ConnectionStatus.Unable_To_Connect;
return(false);
}
}
finally
{
if (gotLock)
{
Monitor.Exit(lockObj);
}
}
return(true);
}
