/**
* <summary>
* This method executes request to a communication layer and handles connection error, if it occurs. Server
* is picked up according to the projection affinity and key given. Connection will be made with the node
* on which key is cached. In case of communication exception client instance is notified and new instance
* of client is created. If none of servers can be reached, an exception is thrown.</summary>
*
* <param name="c">Closure to be executed.</param>
* <param name="cacheName">Cache name for which mapped node will be calculated.</param>
* <param name="affKey">Affinity key.</param>
* <returns>Closure result.</returns>
*/
protected IGridClientFuture <TRes> WithReconnectHandling <TRes>(Func <IGridClientConnection, Guid, IGridClientFuture <TRes> > c, String cacheName, Object affKey)
{
IGridClientDataAffinity affinity = cfg.Affinity(cacheName);
// If pinned (fixed-nodes) or no affinity provided use balancer.
if (_nodes != null || affinity == null)
{
return(WithReconnectHandling(c));
}
try {
IList <N> prjNodes = ProjectionNodes();
if (prjNodes.Count == 0)
{
throw new GridClientServerUnreachableException("Failed to get affinity node" +
" (no nodes in topology were accepted by the filter): " + _filter);
}
N node = affinity.Node(affKey, prjNodes);
GridClientConnectionManager connMgr = cfg.ConnectionManager;
for (int i = 0; i < RetryCount; i++)
{
IGridClientConnection conn = null;
try {
conn = connMgr.connection(node);
return(c(conn, node.Id));
}
catch (GridClientConnectionIdleClosedException e) {
connMgr.onFacadeFailed(node, conn, e);
}
catch (GridClientConnectionResetException e) {
connMgr.onFacadeFailed(node, conn, e);
if (!CheckNodeAlive(node.Id))
{
throw new GridClientServerUnreachableException("Failed to communicate with mapped grid node" +
" for given affinity key (node left the grid)" +
" [nodeId=" + node.Id + ", affKey=" + affKey + ']');
}
}
}
throw new GridClientServerUnreachableException("Failed to communicate with mapped grid node for given affinity " +
"key (did node left the grid?) [nodeId=" + node.Id + ", affKey=" + affKey + ']');
}
catch (GridClientException e) {
return(new GridClientFinishedFuture <TRes>(() => {
throw e;
}));
}
}
/**
* <summary>
* Tries to refresh node on every possible connection in topology.</summary>
*
* <param name="nodeId">Node id to check.</param>
* <returns><c>True</c> if response was received, <c>null</c> if either <c>null</c> response received
* or no nodes can be contacted at all.</returns>
* <exception cref="GridClientClosedException">If client was closed manually.</exception>
*/
protected bool CheckNodeAlive(Guid nodeId)
{
GridClientConnectionManager connMgr = cfg.ConnectionManager;
GridClientTopology top = cfg.Topology;
// Try to get node information on any of the connections possible.
foreach (N node in top.Nodes())
{
try {
// Do not try to connect to the same node.
if (node.Id.Equals(nodeId))
{
continue;
}
// Get connection to node DIFFER from the requested nodeId.
IGridClientConnection conn = connMgr.connection(node);
try {
// Get node via DIFFERENT grid node to ensure the grid knows about node with nodeId (it is alive).
N target = conn.Node(nodeId, false, false, node.Id).Result;
// If requested node not found...
if (target == null)
{
top.NodeFailed(nodeId);
}
return(target != null);
}
catch (GridClientConnectionResetException e) {
connMgr.onFacadeFailed(node, conn, e);
}
catch (GridClientClosedException) {
throw;
}
catch (GridClientException e) {
// Future failed, so connection exception have already been handled.
Dbg.WriteLine("Could not receive node by its id [nodeId={0}, e={1}]", nodeId, e);
}
}
catch (GridClientServerUnreachableException e) {
// Try next node.
Dbg.WriteLine("Could not receive node by its id [nodeId={0}, e={1}]", nodeId, e);
}
}
return(false);
}
/**
* <summary>
* This method executes request to a communication layer and handles connection error, if it occurs.
* In case of communication exception client instance is notified and new instance of client is created.
* If none of the grid servers can be reached, an exception is thrown.</summary>
*
* <param name="c">Closure to be executed.</param>
* <returns>Closure result.</returns>
*/
protected IGridClientFuture <TRes> WithReconnectHandling <TRes>(Func <IGridClientConnection, Guid, IGridClientFuture <TRes> > c)
{
try {
N node = null;
bool changeNode = false;
GridClientConnectionManager connMgr = cfg.ConnectionManager;
for (int i = 0; i < RetryCount; i++)
{
if (node == null || changeNode)
{
node = BalancedNode();
}
IGridClientConnection conn = null;
try {
conn = connMgr.connection(node);
return(c(conn, node.Id));
}
catch (GridClientConnectionIdleClosedException e) {
connMgr.onFacadeFailed(node, conn, e);
// It's ok, just reconnect to the same node.
changeNode = false;
}
catch (GridClientConnectionResetException e) {
connMgr.onFacadeFailed(node, conn, e);
changeNode = true;
}
}
throw new GridClientServerUnreachableException("Failed to communicate with grid nodes " +
"(maximum count of retries reached).");
}
catch (GridClientException e) {
return(new GridClientFinishedFuture <TRes>(() => {
throw e;
}));
}
}
/**
* <summary>
* Creates a new client based on a given configuration.</summary>
*
* <param name="id">Client identifier.</param>
* <param name="cfg0">Client configuration.</param>
* <exception cref="GridClientException">If client configuration is incorrect.</exception>
* <exception cref="GridClientServerUnreachableException">If none of the servers specified in configuration can be reached.</exception>
*/
public GridClientImpl(Guid id, IGridClientConfiguration cfg0)
{
Id = id;
cfg = new GridClientConfiguration(cfg0);
ICollection <IPEndPoint> srvs = ParseServers(cfg.Servers);
ICollection <IPEndPoint> routers = ParseServers(cfg.Routers);
top = new GridClientTopology(id, cfg.IsTopologyCacheEnabled);
Action <Object> addTopLsnr = o => {
var lsnr = o as IGridClientTopologyListener;
if (lsnr != null)
{
top.AddTopologyListener(lsnr);
}
};
// Add to topology as listeners.
foreach (IGridClientDataConfiguration dataCfg in cfg.DataConfigurations)
{
addTopLsnr(dataCfg.Affinity);
}
addTopLsnr(cfg.Balancer);
addTopLsnr(topUpdateBalancer);
if (srvs.Count == 0)
{
// Use routers for initial connection.
srvs = routers;
}
else
{
// Disable routers for connection manager.
routers = new HashSet <IPEndPoint>();
}
connMgr = new GridClientConnectionManager(Id, top, routers, cfg.Credentials, cfg.Protocol, cfg.SslContext, cfg.ConnectTimeout);
int retries = 3;
while (true)
{
IGridClientConnection conn = null;
try {
// Create connection to a server from the list of endpoints.
conn = connMgr.connection(srvs);
// Request topology at start to determine which node we connected to.
// Also this request validates TCP connection is alive.
conn.Topology(false, false, Guid.Empty).WaitDone();
break;
}
catch (GridClientAuthenticationException) {
if (conn != null)
{
conn.Close(false);
}
top.Dispose();
throw;
}
catch (GridClientException e) {
if (conn != null)
{
conn.Close(false);
}
if (retries-- <= 0)
{
top.Dispose();
throw new GridClientException("Failed to update grid topology.", e);
}
}
}
IDictionary <String, GridClientCacheMode> overallCaches = new GridClientNullDictionary <String, GridClientCacheMode>();
// Topology is now updated, so we can identify current connection.
foreach (GridClientNodeImpl node in top.Nodes())
{
foreach (KeyValuePair <String, GridClientCacheMode> pair in node.Caches)
{
overallCaches[pair.Key] = pair.Value;
}
}
foreach (KeyValuePair <String, GridClientCacheMode> entry in overallCaches)
{
if (Affinity(entry.Key) is GridClientPartitionAffinity && entry.Value != GridClientCacheMode.Partitioned)
{
Dbg.WriteLine(typeof(GridClientPartitionAffinity) + " is used for a cache configured " +
"for non-partitioned mode [cacheName=" + entry.Key + ", cacheMode=" + entry.Value + ']');
}
}
idleCheckThread = new Thread(checkIdle);
idleCheckThread.Name = "grid-check-idle-worker--client#" + id;
idleCheckThread.Start();
topUpdateThread = new Thread(updateTopology);
topUpdateThread.Name = "grid-topology-update-worker--client#" + id;
topUpdateThread.Start();
_compute = new GridClientComputeImpl(this, null, null, cfg.Balancer);
Dbg.WriteLine("Client started. Id: " + Id);
}
