/**
* Callback function that is invoked when TargetSelector fetches candidate scores in a range.
* Initiates connection setup.
* Node: All connection messages can be tagged with a token string. This token string is currenly being
* used to keep the following information about a shortcut:
* 1. The node who initiated the shortcut setup.
* 2. The random target near which shortcut was chosen.
* @param start address pointing to the start of range to query.
* @param score_table list of candidate addresses sorted by score.
* @param current currently selected optimal (nullable)
*/
protected void CreateShortcutCallback(Address start, SortedList score_table, Address current)
{
if (score_table.Count > 0)
{
/**
* we remember our address and the start of range inside the token.
* token is the concatenation of
* (a) local node address
* (b) random target for the range queried by target selector
*/
string token = _node.Address + start.ToString();
//connect to the min_target
Address min_target = (Address)score_table.GetByIndex(0);
ISender send = null;
if (start.Equals(min_target))
{
//looks like the target selector simply returned our random address
#if TRACE
if (ProtocolLog.SCO.Enabled)
{
ProtocolLog.Write(ProtocolLog.SCO,
String.Format("SCO local: {0}, Connecting (shortcut) to min_target: {1} (greedy), random_target: {2}.",
_node.Address, min_target, start));
}
#endif
//use a greedy sender
send = new AHGreedySender(_node, min_target);
}
else
{
#if TRACE
if (ProtocolLog.SCO.Enabled)
{
ProtocolLog.Write(ProtocolLog.SCO,
String.Format("SCO local: {0}, Connecting (shortcut) to min_target: {1} (exact), random_target: {2}.",
_node.Address, min_target, start));
}
#endif
//use exact sender
send = new AHExactSender(_node, min_target);
}
ConnectTo(send, min_target, STRUC_SHORT, token);
}
}
// Provides an Exact AH Secure Sender using the default SPI given an address
public SecurityAssociation GetSecureSender(Address target)
{
SecurityAssociation sa = null;
bool new_sa = false;
lock(_sync) {
if(_address_to_sa.ContainsKey(target)) {
sa = _address_to_sa[target];
} else {
AHSender sender = new AHExactSender(_node, target);
sa = base.CreateSecurityAssociation(sender, SecurityPolicy.DefaultSPI);
_address_to_sa[target] = sa;
_sa_to_address[sa] = target;
new_sa = true;
}
}
if(new_sa) {
StartSA(sa);
}
return sa;
}
protected void CreateSecurityAssociation()
{
var sender = new AHExactSender(Node0.Node, Node1.Node.Address);
var sa = Node0.Sso.CreateSecurityAssociation(sender);
SecurityAssociation.StateChangeHandler callback =
delegate(SecurityAssociation in_sa, SecurityAssociation.States state)
{
if(state == SecurityAssociation.States.Active) {
SecurityAssociationEstablished();
} else if(state == SecurityAssociation.States.Closed) {
Finished();
} else {
Console.WriteLine(state);
}
};
if(sa.State != SecurityAssociation.States.Waiting) {
callback(sa, sa.State);
} else {
sa.StateChangeEvent += callback;
}
}
/**
* Callback function that is invoked when TargetSelector fetches candidate scores in a range.
* Initiates connection setup.
* Node: All connection messages can be tagged with a token string. This token string is currenly being
* used to keep the following information about a shortcut:
* 1. The node who initiated the shortcut setup.
* 2. The random target near which shortcut was chosen.
* @param start address pointing to the start of range to query.
* @param score_table list of candidate addresses sorted by score.
* @param current currently selected optimal (nullable)
*/
protected void CreateShortcutCallback(Address start, SortedList score_table, Address current) {
if (score_table.Count > 0) {
/**
* we remember our address and the start of range inside the token.
* token is the concatenation of
* (a) local node address
* (b) random target for the range queried by target selector
*/
string token = _node.Address + start.ToString();
//connect to the min_target
Address min_target = (Address) score_table.GetByIndex(0);
ISender send = null;
if (start.Equals(min_target)) {
//looks like the target selector simply returned our random address
if (LogEnabled) {
ProtocolLog.Write(ProtocolLog.SCO,
String.Format("SCO local: {0}, Connecting (shortcut) to min_target: {1} (greedy), random_target: {2}.",
_node.Address, min_target, start));
}
//use a greedy sender
send = new AHGreedySender(_node, min_target);
} else {
if (LogEnabled) {
ProtocolLog.Write(ProtocolLog.SCO,
String.Format("SCO local: {0}, Connecting (shortcut) to min_target: {1} (exact), random_target: {2}.",
_node.Address, min_target, start));
}
//use exact sender
send = new AHExactSender(_node, min_target);
}
ConnectTo(send, min_target, STRUC_SHORT, token);
}
}
