/**
* This is a recursive function over the network
* It helps to build an IList of IDictionary types that give the address
* of each node in the path, and the connection to the next closest node if
* there is one, otherwise no next.
*/
protected void DoTraceRouteTo(AHAddress a, object req_state) {
/*
* First find the Connection pointing to the node closest to dest, if
* there is one closer than us
*/
ConnectionTable tab = _node.ConnectionTable;
ConnectionList structs = tab.GetConnections(ConnectionType.Structured);
Connection next_closest = structs.GetNearestTo((AHAddress) _node.Address, a);
//Okay, we have the next closest:
ListDictionary my_entry = new ListDictionary();
my_entry["node"] = _node.Address.ToString();
if( next_closest != null ) {
my_entry["next_con"] = next_closest.ToString();
Channel result = new Channel();
//We only want one result, so close the queue after we get the first
result.CloseAfterEnqueue();
result.CloseEvent += delegate(object o, EventArgs args) {
Channel q = (Channel)o;
if( q.Count > 0 ) {
try {
RpcResult rres = (RpcResult)q.Dequeue();
IList l = (IList) rres.Result;
ArrayList results = new ArrayList( l.Count + 1);
results.Add(my_entry);
results.AddRange(l);
_rpc.SendResult(req_state, results);
}
catch(Exception x) {
string m = String.Format("<node>{0}</node> trying <connection>{1}</connection> got <exception>{2}</exception>", _node.Address, next_closest, x);
Exception nx = new Exception(m);
_rpc.SendResult(req_state, nx);
}
}
else {
//We got no results.
IList l = new ArrayList(1);
l.Add( my_entry );
_rpc.SendResult(req_state, l);
}
};
_rpc.Invoke(next_closest.State.Edge, result, "trace.GetRouteTo", a.ToString());
}
else {
//We are the end of the line, send the result:
ArrayList l = new ArrayList();
l.Add(my_entry);
_rpc.SendResult(req_state, l);
}
}
/**
* This is a recursive function over the network
* It helps do a link-reliable procedure call on the
* on the overlay network.
*/
protected void RecursiveCall(IList margs, object req_state) {
//first argument is the target node.
AHAddress a = (AHAddress) AddressParser.Parse( (string) margs[0]);
/*
* First find the Connection pointing to the node closest to dest, if
* there is one closer than us
*/
ConnectionTable tab = _node.ConnectionTable;
ConnectionList structs = tab.GetConnections(ConnectionType.Structured);
Connection next_closest = structs.GetNearestTo((AHAddress) _node.Address, a);
//Okay, we have the next closest:
if( next_closest != null ) {
Channel result = new Channel();
//We only want one result, so close the queue after we get the first
result.CloseAfterEnqueue();
result.CloseEvent += delegate(object o, EventArgs args) {
Channel q = (Channel)o;
if( q.Count > 0 ) {
try {
RpcResult rres = (RpcResult)q.Dequeue();
_rpc.SendResult(req_state, rres.Result);
}
catch(Exception x) {
string m = String.Format("<node>{0}</node> trying <connection>{1}</connection> got <exception>{2}</exception>", _node.Address, next_closest, x);
Exception nx = new Exception(m);
_rpc.SendResult(req_state, nx);
}
}
else {
//We got no results.
_rpc.SendResult(req_state, null);
}
};
object [] new_args = new object[margs.Count];
margs.CopyTo(new_args, 0);
_rpc.Invoke(next_closest.State.Edge, result, "trace.RecursiveCall", new_args);
}
else {
//We are the end of the line, send the result:
//Console.Error.WriteLine("Doing a local invocation");
Channel result = new Channel();
result.CloseAfterEnqueue();
result.CloseEvent += delegate(object o, EventArgs args) {
Channel q = (Channel)o;
if( q.Count > 0 ) {
try {
//Console.Error.WriteLine("Got result.");
RpcResult rres = (RpcResult)q.Dequeue();
_rpc.SendResult(req_state, rres.Result);
}
catch(Exception x) {
string m = String.Format("<node>{0}</node> local invocation got <exception>{1}</exception>", _node.Address, x);
Exception nx = new Exception(m);
_rpc.SendResult(req_state, nx);
}
}
else {
//We got no results.
_rpc.SendResult(req_state, null);
}
};
string method_name = (string) margs[1];
object [] new_args = new object[margs.Count - 2];
margs.RemoveAt(0);//extract destination address
margs.RemoveAt(0); //extract method name
margs.CopyTo(new_args, 0);
//Console.Error.WriteLine("Calling method: {0}, args_count: {1}", method_name, new_args.Length);
//for (int i = 0; i < new_args.Length; i++) {
//Console.Error.WriteLine(new_args[i]);
//}
_rpc.Invoke(_node, result, method_name, new_args);
}
}
/**
* When we get a response to the sys:link method, this handled
* is called
*/
protected void LinkCloseHandler(object q, EventArgs args) {
try {
Channel resq = (Channel)q;
//If the Channel is empty this will throw an exception:
RpcResult res = (RpcResult)resq.Dequeue();
/* Here's the LinkMessage response */
LinkMessage lm = new LinkMessage( (IDictionary)res.Result );
/**
* This will set our LinkMessageReply variable. It can
* only be set once, so all future sets will fail. It
* will also make sure we have the lock on the target.
* If we don't, that will throw an exception
*/
SetAndCheckLinkReply(lm);
//If we got here, we have our response and the Lock on _target_address
StatusMessage sm = _node.GetStatus(_contype, lm.Local.Address);
/* Make the call */
Channel results = new Channel();
results.CloseAfterEnqueue();
results.CloseEvent += this.StatusCloseHandler;
RpcManager rpc = _node.Rpc;
if (ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format(
"LPS target: {0} Invoking GetStatus() over edge: {1}",
_linker.Target, _e));
}
/*
* This could throw an exception if the Edge is closed
*/
rpc.Invoke(_e, results, "sys:link.GetStatus", sm.ToDictionary() );
}
catch(AdrException x) {
/*
* This happens when the RPC call has some kind of issue,
* first we check for common error conditions:
*/
_x.Value = x;
Finish( GetResultForErrorCode(x.Code) );
}
catch(ConnectionExistsException x) {
/* We already have a connection */
_x.Value = x;
Finish( Result.ProtocolError );
}
catch(CTLockException x) {
//This is thrown when ConnectionTable cannot lock. Lets try again:
_x.Value = x;
Finish( Result.RetryThisTA );
}
catch(LinkException x) {
_x.Value = x;
if( x.IsCritical ) { Finish( Result.MoveToNextTA ); }
else { Finish( Result.RetryThisTA ); }
}
catch(InvalidOperationException) {
//The queue never got anything
Finish(Result.MoveToNextTA);
}
catch(EdgeException) {
//The Edge is goofy, let's move on:
Finish(Result.MoveToNextTA);
}
catch(Exception x) {
//The protocol was not followed correctly by the other node, fail
_x.Value = x;
Finish( Result.RetryThisTA );
}
}
public override void Start() {
//Make sure the Node is listening to this node
try {
//This will throw an exception if _e is already closed:
_e.CloseEvent += this.CloseHandler;
//_e must not be closed, let's start listening to it:
_e.Subscribe(_node, _e);
/* Make the call */
Channel results = new Channel();
results.CloseAfterEnqueue();
results.CloseEvent += this.LinkCloseHandler;
RpcManager rpc = _node.Rpc;
if(ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("LPS target: {0} Invoking Start() over edge: {1}", _linker.Target, _e));
}
rpc.Invoke(_e, results, "sys:link.Start", MakeLM().ToDictionary() );
}
catch (Exception e) {
//The Edge must have closed, move on to the next TA
if(ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("LPS target: {0} Start() over edge: {1}, hit exception: {2}",
_linker.Target, _e, e));
}
Finish(Result.MoveToNextTA);
}
}
public void ChannelTests() {
Channel c0 = new Channel();
bool e_event_fired = false;
c0.EnqueueEvent += delegate(object o, EventArgs arg) {
e_event_fired = true;
};
c0.Enqueue(0);
bool c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Close();
Assert.IsTrue(c_event_fired, "CloseEvent");
c0 = new Channel();
c0.CloseAfterEnqueue();
c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Enqueue(1); //This should close the channel:
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.IsTrue(c0.Closed, "Closed");
c0 = new Channel(1);
c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Enqueue(1); //This should close the channel:
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.IsTrue(c0.Closed, "Closed");
//Try with different starting values:
Random r = new Random();
int en_count;
for(int i = 0; i < 100; i++) {
int max_enqueues = r.Next(1, 1000);
c0 = new Channel(max_enqueues);
c_event_fired = false;
en_count = 0;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.EnqueueEvent += delegate(object o, EventArgs arg) {
en_count++;
};
for(int j = 0; j < max_enqueues; j++) {
c0.Enqueue(j);
}
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.AreEqual(en_count, max_enqueues, "EnqueueEvent count");
Assert.IsTrue(c0.Closed, "Closed");
try {
c0.Enqueue(null);
Assert.IsTrue(false, "Enqueue after close didn't fail");
}
catch {
Assert.IsTrue(true, "Enqueue after close Got exception");
}
}
}
public void ChannelTests()
{
Channel c0 = new Channel();
bool e_event_fired = false;
c0.EnqueueEvent += delegate(object o, EventArgs arg) {
e_event_fired = true;
};
c0.Enqueue(0);
bool c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Close();
Assert.IsTrue(c_event_fired, "CloseEvent");
c0 = new Channel();
c0.CloseAfterEnqueue();
c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Enqueue(1); //This should close the channel:
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.IsTrue(c0.Closed, "Closed");
c0 = new Channel(1);
c_event_fired = false;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.Enqueue(1); //This should close the channel:
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.IsTrue(c0.Closed, "Closed");
//Try with different starting values:
Random r = new Random();
int en_count;
for (int i = 0; i < 100; i++)
{
int max_enqueues = r.Next(1, 1000);
c0 = new Channel(max_enqueues);
c_event_fired = false;
en_count = 0;
c0.CloseEvent += delegate(object o, EventArgs arg) {
c_event_fired = true;
};
c0.EnqueueEvent += delegate(object o, EventArgs arg) {
en_count++;
};
for (int j = 0; j < max_enqueues; j++)
{
c0.Enqueue(j);
}
Assert.IsTrue(c_event_fired, "CloseEvent on Enqueue");
Assert.AreEqual(en_count, max_enqueues, "EnqueueEvent count");
Assert.IsTrue(c0.Closed, "Closed");
try {
c0.Enqueue(null);
Assert.IsTrue(false, "Enqueue after close didn't fail");
}
catch {
Assert.IsTrue(true, "Enqueue after close Got exception");
}
}
}
