public static bool Unsubscribe(Topic t, SubRec sr)
{
if (RemoveSubscripton(t, sr))
{
var c = Perform.Create(t, Perform.Art.unsubscribe, null);
c.o = sr;
_repo.DoCmd(c, false);
return(true);
}
return(false);
}
public static bool RemoveSubscripton(Topic t, SubRec sr)
{
if (t._subRecords == null)
{
return(false);
}
bool fl;
lock (t._subRecords) {
fl = t._subRecords.Remove(sr);
}
return(fl);
}
public static void Subscribe(Topic t, SubRec sr)
{
if (t._subRecords == null)
{
lock (t) {
if (t._subRecords == null)
{
t._subRecords = new List <SubRec>();
}
}
}
lock (t._subRecords) {
if (!t._subRecords.Any(z => z.func == sr.func && z.setTopic == sr.setTopic && z.mask == sr.mask && ((z.mask & SubRec.SubMask.Field) == SubRec.SubMask.None || z.prefix == sr.prefix)))
{
t._subRecords.Add(sr);
}
}
}
public SubRec Subscribe(SubRec.SubMask mask, string prefix, Action <Perform, SubRec> func)
{
if (func == null)
{
throw new ArgumentNullException(this.path + ".Subscribe(func == NULL, " + mask.ToString() + (prefix == null ? string.Empty : ", " + prefix) + ")");
}
SubRec sb;
bool exist = true;
if (_subRecords == null)
{
lock (this._sync) {
if (_subRecords == null)
{
var srs = new List <SubRec>();
_subRecords = srs; // PVS V3054. Potentially unsafe double-checked locking.
}
}
}
lock (_subRecords) {
sb = _subRecords.FirstOrDefault(z => z.func == func && z.setTopic == this && z.mask == mask && ((z.mask & SubRec.SubMask.Field) == SubRec.SubMask.None || z.prefix == prefix));
if (sb == null)
{
exist = false;
sb = new SubRec(this, func, mask, prefix);
_subRecords.Add(sb);
}
}
if (!exist)
{
var c = Perform.Create(this, Perform.Art.subscribe, this);
c.o = sb;
_repo.DoCmd(c, false);
}
else
{
var c = Perform.Create(this, Perform.Art.subAck, this);
c.o = sb;
_repo.DoCmd(c, false);
}
return(sb);
}