/**
* <summary>
* Updates topology if cache enabled. If cache is disabled, returns original node.</summary>
*
* <param name="node">Converted rest server response.</param>
* <returns>Node in topology.</returns>
*/
public N UpdateNode(N node)
{
A.NotNull(node, "node");
busyLock.AcquireWriterLock(Timeout.Infinite);
try {
bool nodeAdded = !_nodes.ContainsKey(node.Id);
// We update the whole topology if node was not in topology or we cache metrics.
if (nodeAdded || topCache)
{
node = ClearAttributes(node);
_nodes[node.Id] = node;
}
if (nodeAdded)
{
FireEvents(new TopologyEvent[] { new TopologyEvent(true, node) });
}
return(node);
}
finally {
busyLock.ReleaseWriterLock();
}
}
/**
* <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;
}));
}
}
/** <inheritdoc /> */
public IGridClientData PinNodes(N node, params N[] nodes)
{
LinkedList <N> n = new LinkedList <N>();
n.AddFirst(node);
if (nodes != null)
{
n.AddAll(nodes);
}
return(CreateProjection(n, null, null));
}
/**
* <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>
* Clears attributes and metrics map in case if node cache is disabled.</summary>
*
* <param name="node">Node to be cleared.</param>
* <returns>The same node if cache is enabled or node contains no attributes and metrics,</returns>
* otherwise will return new node without attributes and metrics.
*/
private N ClearAttributes(N node)
{
if (topCache || (node.Attributes.Count == 0 && node.Metrics == null))
{
return(node);
}
// Fill all fields but attributes and metrics since we do not cache them.
GridClientNodeImpl updated = new GridClientNodeImpl(node.Id);
updated.TcpAddresses.AddAll <String>(node.TcpAddresses);
updated.TcpHostNames.AddAll <String>(node.TcpHostNames);
updated.JettyAddresses.AddAll <String>(node.JettyAddresses);
updated.JettyHostNames.AddAll <String>(node.JettyHostNames);
updated.TcpPort = node.TcpPort;
updated.HttpPort = node.HttpPort;
updated.ConsistentId = node.ConsistentId;
updated.Metrics = null;
updated.Caches.AddAll <KeyValuePair <String, GridClientCacheMode> >(node.Caches);
return(updated);
}
/**
* <summary>
* Creates a new event.</summary>
*
* <param name="added">If <c>true</c>, indicates that node was added to topology.</param>
* If <c>false</c>, indicates that node was removed.
* <param name="node">Added or removed node.</param>
*/
public TopologyEvent(bool added, N node)
{
this.Added = added;
this.Node = node;
}
/**
* <summary>
* Clears attributes and metrics map in case if node cache is disabled.</summary>
*
* <param name="node">Node to be cleared.</param>
* <returns>The same node if cache is enabled or node contains no attributes and metrics,</returns>
* otherwise will return new node without attributes and metrics.
*/
private N ClearAttributes(N node)
{
if (topCache || (node.Attributes.Count == 0 && node.Metrics == null))
return node;
// Fill all fields but attributes and metrics since we do not cache them.
GridClientNodeImpl updated = new GridClientNodeImpl(node.Id);
updated.TcpAddresses.AddAll<String>(node.TcpAddresses);
updated.TcpHostNames.AddAll<String>(node.TcpHostNames);
updated.JettyAddresses.AddAll<String>(node.JettyAddresses);
updated.JettyHostNames.AddAll<String>(node.JettyHostNames);
updated.TcpPort = node.TcpPort;
updated.HttpPort = node.HttpPort;
updated.ConsistentId= node.ConsistentId;
updated.Metrics = null;
updated.Caches.AddAll<KeyValuePair<String, GridClientCacheMode>>(node.Caches);
return updated;
}
/**
* <summary>
* Updates topology if cache enabled. If cache is disabled, returns original node.</summary>
*
* <param name="node">Converted rest server response.</param>
* <returns>Node in topology.</returns>
*/
public N UpdateNode(N node)
{
A.NotNull(node, "node");
busyLock.AcquireWriterLock(Timeout.Infinite);
try {
bool nodeAdded = !_nodes.ContainsKey(node.Id);
// We update the whole topology if node was not in topology or we cache metrics.
if (nodeAdded || topCache) {
node = ClearAttributes(node);
_nodes[node.Id] = node;
}
if (nodeAdded)
FireEvents(new TopologyEvent[] { new TopologyEvent(true, node) });
return node;
}
finally {
busyLock.ReleaseWriterLock();
}
}
/**
* <summary>
* Creates a new event.</summary>
*
* <param name="added">If <c>true</c>, indicates that node was added to topology.</param>
* If <c>false</c>, indicates that node was removed.
* <param name="node">Added or removed node.</param>
*/
public TopologyEvent(bool added, N node)
{
this.Added = added;
this.Node = node;
}
/** <inheritdoc /> */
public IGridClientCompute Projection(N node)
{
return(CreateProjection(U.List(node), null, null));
}
