/**
* <summary>
* Creates a connected facade and returns it. Called either from constructor or inside
* a write lock.</summary>
*
* <param name="srvs">List of server addresses that this method will try to connect to.</param>
* <returns>Connected client facade.</returns>
* <exception cref="GridClientServerUnreachableException">If none of the servers can be reached.</exception>
*/
private C connect(ICollection <IPEndPoint> srvs)
{
Dbg.Assert(guard.IsReaderLockHeld);
if (srvs.Count == 0)
{
throw new GridClientServerUnreachableException("Failed to establish connection to the grid node (address " +
"list is empty).");
}
IOException cause = null;
foreach (IPEndPoint srv in srvs)
{
try {
C cnn = connect(srv);
Dbg.WriteLine("Connection successfully opened: " + srv);
return(cnn);
}
catch (IOException e) {
Dbg.WriteLine("Unable to connect to grid node [srvAddr=" + srv + ", msg=" + e.Message + ']');
cause = e;
}
}
A.NotNull(cause, "cause");
throw new GridClientServerUnreachableException("Failed to connect to any of the servers in list: "
+ String.Join <IPEndPoint>(",", srvs), cause);
}
/**
* <summary>
* Handles communication connection failure. Tries to reconnect to any of the servers specified and
* throws an exception if none of the servers can be reached.</summary>
*
* <param name="node">Remote node for which this connection belongs to.</param>
* <param name="conn">Facade that caused the exception.</param>
* <param name="e">Exception.</param>
*/
public void onFacadeFailed(IGridClientNode node, C conn, GridClientConnectionResetException e)
{
Dbg.WriteLine("Connection with remote node was terminated" +
"[node=" + node + ", srvAddr=" + conn.ServerAddress + ", errMsg=" + e.Message + ']');
guard.AcquireWriterLock(Timeout.Infinite);
try {
IPEndPoint srv = conn.ServerAddress;
C cached;
if (conns.TryGetValue(srv, out cached) && cached.Equals(conn))
{
conns.Remove(srv);
}
}
finally {
guard.ReleaseWriterLock();
}
/* Close connection to failed node outside the writer lock. */
closeSilent(conn, false);
}
/**
* <summary>
* Silent connection close.</summary>
*
* <param name="conn">Connection to close.</param>
* <param name="waitCompletion">If <c>true</c> will wait for all pending requests to be proceeded.</param>
*/
private static void closeSilent(C conn, bool waitCompletion)
{
U.DoSilent<Exception>(() => conn.Close(waitCompletion), e =>
Dbg.WriteLine("Failed to close connection [conn=" + conn + ", e=" + e.Message + "]"));
}
/**
* <summary>
* Handles communication connection failure. Tries to reconnect to any of the servers specified and
* throws an exception if none of the servers can be reached.</summary>
*
* <param name="node">Remote node for which this connection belongs to.</param>
* <param name="conn">Facade that caused the exception.</param>
* <param name="e">Exception.</param>
*/
public void onFacadeFailed(IGridClientNode node, C conn, GridClientConnectionResetException e)
{
Dbg.WriteLine("Connection with remote node was terminated" +
"[node=" + node + ", srvAddr=" + conn.ServerAddress + ", errMsg=" + e.Message + ']');
guard.AcquireWriterLock(Timeout.Infinite);
try {
IPEndPoint srv = conn.ServerAddress;
C cached;
if (conns.TryGetValue(srv, out cached) && cached.Equals(conn))
conns.Remove(srv);
}
finally {
guard.ReleaseWriterLock();
}
/* Close connection to failed node outside the writer lock. */
closeSilent(conn, false);
}
/**
* <summary>
* Silent connection close.</summary>
*
* <param name="conn">Connection to close.</param>
* <param name="waitCompletion">If <c>true</c> will wait for all pending requests to be proceeded.</param>
*/
private static void closeSilent(C conn, bool waitCompletion)
{
U.DoSilent <Exception>(() => conn.Close(waitCompletion), e =>
Dbg.WriteLine("Failed to close connection [conn=" + conn + ", e=" + e.Message + "]"));
}
