I have two Fix Sessions with identical SessionIDs (this can't be changed, since the server side specifies the values for SenderCompID and TargetCompID). I learnt that I can use a SessionQualifier in the config file to disambiguate the two Sessions.
#config for session 1
SenderCompID=Sender
TargetCompID=Target
SessionQualifier=FirstSession
......
#config for session 2
SenderCompID=Sender
TargetCompID=Target
SessionQualifier=SecondSession
......
Now when I were to send a message via a particular session,
QuickFix.Session.SendToTarget(msg, sessionID);
//where sessionID = "FIX.4.4:Sender->Target" which is identical for both sessions
what should I do to tell the computer to send it through which session?
I'm not sure about quickfixn, but quickfixj has several constructors for SessionID, including:
public SessionID(String beginString, String senderCompID, String targetCompID, String qualifier)
So if you want to send message to one of session, you need to construct SessionID with qualifier like:
SessionID session1 = new SessionID("FIX.4.4", "Sender", "Target", "FirstSession");
QuickFix.Session.SendToTarget(msg, session1);
SessionID session2 = new SessionID("FIX.4.4", "Sender", "Target", "SecondSession")
QuickFix.Session.SendToTarget(msg, session2);
Related
I would like to store values of event properties received from the server in a database. My problems are that in the event consumer:
I cant figure out which eventtype my client received.
I dont know how to map variant indexes to properties without knowing the EventType.
Events come with the property "EventType", which would solve my first problem. But since I am receiving many different event types, I do not know in which variant index it is located. Should I always relocate "EventType" at index 0 in the select clause whenever creating a new EventFilter?
For the second problem, item.getMonitoringFilter().decode(client.getSerializationContext())) offers a view on the property structure but I am not sure how to use it for mapping of variants to properties. Does anybody know how to solve those problems?
Here is the event consumer code that I use. It is taken from milo client examples.
for (UaMonitoredItem monitoredItem: mItems){
monitoredItem.setEventConsumer((item, vs) -> {
LOGGER.info(
"Event Received from: {}", item.getReadValueId().getNodeId());
LOGGER.info(
"getMonitoredItemId: {}", item.getMonitoredItemId());
LOGGER.info(
"getMonitoringFilter: {}", item.getMonitoringFilter().decode(client.getSerializationContext()));
for (int i = 0; i < vs.length; i++) {
LOGGER.info("variant[{}]:, datatype={}, value={}", i, vs[i].getDataType(), vs[i].getValue());
}
});
}
Thank you in advance.
Update:
Seems I have figured it out, by typcasting to EventFilter. Further information such as qName for event properties or event type node IDs can then be derived:
ExtensionObject eObject = item.getMonitoringFilter();
EventFilter eFilter = ((EventFilter) eObject.decode(client.getSerializationContext()));
QualifiedName qName = eFilter.getSelectClauses()[0].getBrowsePath()[0];
LiteralOperand literalOperand = (LiteralOperand) eFilter.getWhereClause().getElements()[0]
.getFilterOperands()[1].decode(client.getSerializationContext());
NodeId eventTypeNodeId = (NodeId) literalOperand.getValue().getValue();
Didn't you supply the filter in the first place when you created the MonitoredItem? Why do you need to "reverse engineer" the filter result to get back to what you did in the first place?
The properties you receive in the event data and the order they come in are defined by the select clause you used when creating the MonitoredItem. If you choose to select the EventId field then it will always be at the same corresponding index.
I am planning to write simple program using kubernetes java client (https://github.com/kubernetes-client/java/). I could get all namespaces and pods but how do i get list of deployments in a given namespace? I couldn't find any method. Is there any way to get it?
for (V1Namespace ns: namespaces.getItems()) {
System.out.println("------Begin-----");
System.out.println("Namespace: " + ns.getMetadata().getName());
V1PodList pods = api.listNamespacedPod(ns.getMetadata().getName(), null, null, null, null, null, null, null, null, null);
int count = 0;
for (V1Pod pod: pods.getItems()) {
System.out.println("Pod " + (++count) + ": " + pod.getMetadata().getName());
System.out.println("Node: " + pod.getSpec().getNodeName());
}
System.out.println("------ENd-----");
}
I guess you're looking for the following example:
public class Example {
public static void main(String[] args) {
ApiClient defaultClient = Configuration.getDefaultApiClient();
defaultClient.setBasePath("http://localhost");
// Configure API key authorization: BearerToken
ApiKeyAuth BearerToken = (ApiKeyAuth) defaultClient.getAuthentication("BearerToken");
BearerToken.setApiKey("YOUR API KEY");
// Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)
//BearerToken.setApiKeyPrefix("Token");
AppsV1Api apiInstance = new AppsV1Api(defaultClient);
String namespace = "namespace_example"; // String | object name and auth scope, such as for teams and projects
String pretty = "pretty_example"; // String | If 'true', then the output is pretty printed.
Boolean allowWatchBookmarks = true; // Boolean | allowWatchBookmarks requests watch events with type \"BOOKMARK\". Servers that do not implement bookmarks may ignore this flag and bookmarks are sent at the server's discretion. Clients should not assume bookmarks are returned at any specific interval, nor may they assume the server will send any BOOKMARK event during a session. If this is not a watch, this field is ignored. If the feature gate WatchBookmarks is not enabled in apiserver, this field is ignored.
String _continue = "_continue_example"; // String | The continue option should be set when retrieving more results from the server. Since this value is server defined, clients may only use the continue value from a previous query result with identical query parameters (except for the value of continue) and the server may reject a continue value it does not recognize. If the specified continue value is no longer valid whether due to expiration (generally five to fifteen minutes) or a configuration change on the server, the server will respond with a 410 ResourceExpired error together with a continue token. If the client needs a consistent list, it must restart their list without the continue field. Otherwise, the client may send another list request with the token received with the 410 error, the server will respond with a list starting from the next key, but from the latest snapshot, which is inconsistent from the previous list results - objects that are created, modified, or deleted after the first list request will be included in the response, as long as their keys are after the \"next key\". This field is not supported when watch is true. Clients may start a watch from the last resourceVersion value returned by the server and not miss any modifications.
String fieldSelector = "fieldSelector_example"; // String | A selector to restrict the list of returned objects by their fields. Defaults to everything.
String labelSelector = "labelSelector_example"; // String | A selector to restrict the list of returned objects by their labels. Defaults to everything.
Integer limit = 56; // Integer | limit is a maximum number of responses to return for a list call. If more items exist, the server will set the `continue` field on the list metadata to a value that can be used with the same initial query to retrieve the next set of results. Setting a limit may return fewer than the requested amount of items (up to zero items) in the event all requested objects are filtered out and clients should only use the presence of the continue field to determine whether more results are available. Servers may choose not to support the limit argument and will return all of the available results. If limit is specified and the continue field is empty, clients may assume that no more results are available. This field is not supported if watch is true. The server guarantees that the objects returned when using continue will be identical to issuing a single list call without a limit - that is, no objects created, modified, or deleted after the first request is issued will be included in any subsequent continued requests. This is sometimes referred to as a consistent snapshot, and ensures that a client that is using limit to receive smaller chunks of a very large result can ensure they see all possible objects. If objects are updated during a chunked list the version of the object that was present at the time the first list result was calculated is returned.
String resourceVersion = "resourceVersion_example"; // String | When specified with a watch call, shows changes that occur after that particular version of a resource. Defaults to changes from the beginning of history. When specified for list: - if unset, then the result is returned from remote storage based on quorum-read flag; - if it's 0, then we simply return what we currently have in cache, no guarantee; - if set to non zero, then the result is at least as fresh as given rv.
Integer timeoutSeconds = 56; // Integer | Timeout for the list/watch call. This limits the duration of the call, regardless of any activity or inactivity.
Boolean watch = true; // Boolean | Watch for changes to the described resources and return them as a stream of add, update, and remove notifications. Specify resourceVersion.
try {
V1DeploymentList result = apiInstance.listNamespacedDeployment(namespace, pretty, allowWatchBookmarks, _continue, fieldSelector, labelSelector, limit, resourceVersion, timeoutSeconds, watch);
System.out.println(result);
} catch (ApiException e) {
System.err.println("Exception when calling AppsV1Api#listNamespacedDeployment");
System.err.println("Status code: " + e.getCode());
System.err.println("Reason: " + e.getResponseBody());
System.err.println("Response headers: " + e.getResponseHeaders());
e.printStackTrace();
}
}
}
I want to use the MailKit Pop3Client to retrieve messages from a POP3 mailbox, and then delete these messages after processing. The retrieval code is something like:
Public Function GetMessages(Optional logPath As String = Nothing) As List(Of MimeMessage)
Dim client As Pop3Client
Dim messages = New List(Of MimeMessage)()
Using client
ConnectPop3(client)
Dim count = client.GetMessageCount()
For i As Integer = 0 To count - 1
Dim msg = client.GetMessage(i)
messages.Add(msg)
Next
End Using
Return messages
End Function
My problem here is in order to delete a message in another message, I need an index, but that is long gone once I exit GetMessages. All I have is the info available on a MimeMessage object, but that has no index property, only MessageId, but in my Delete method, I would have to read all mails again, in order to look up an index value.
Now Pop3Client has a GetMessageUid(int index) method, which returns a mysterious string (looks like int) value with no apparent relation at all to the Mime MessageID, but it seems this is all I have. Then I have to store the MailKit Uid with each message, making my retrieval code something like this, using a dictionary to store uid-message pairs:
Public Function GetMessages(Optional delete As Boolean = False, Optional logPath As String = Nothing) As List(Of MimeMessage)
Dim client As Pop3Client
Dim messages = New Dictionary(Of String, MimeMessage)
Using client
ConnectPop3(client)
Dim count = client.GetMessageCount()
For i As Integer = 0 To count - 1
Dim msg = client.GetMessage(i)
Dim u = client.GetMessageUid(i)
messages.Add(u, msg)
Next
client.Disconnect(True)
End Using
Return messages
End Function
I am really hoping I'm missing something here and what should be a really simple process is indeed simple, but I can't find anything else on my own.
The message UID is the only way to track a message between connections.
The index for a message can change as other messages are deleted.
Your options are:
Delete messages as you're downloading them.
Save the UID so you can come back and delete specific messages later.
It may make more sense if you skim through the POP3 RFC.
What is Trigger Event here ?
How to plug this to the EsperEngine for getting events ?
What URI should be passed ? how should engineURI look like ?
Is it the remote location of the esper engine ?
ConfigurationHTTPAdapter adapterConfig = new ConfigurationHTTPAdapter();
// add additional configuration
Request request = new Request();
request.setStream("TriggerEvent");
request.setUri("http://localhost:8077/root");
adapterConfig.getRequests().add(request);
// start adapter
EsperIOHTTPAdapter httpAdapter = new EsperIOHTTPAdapter(adapterConfig, "engineURI");
httpAdapter.start();
// destroy the adapter when done
httpAdapter.destroy();
Changed the stream from TriggerEvents to HttpEvents and I get this exception given below
ConfigurationException: Event type by name 'HttpEvents' not found
The "engineURI" is a name for the CEP engine instance and has nothing to do with the EsperIO http transport. Its a name for looking up what engines exists and finding the engine by name. So any text can be used here and the default CEP engine is named "default" when you allocate the default one.
You should define the event type of the event you expect to receive via http. A sample code is in http://svn.codehaus.org/esper/esper/trunk/esperio-socket/src/test/java/com/espertech/esperio/socket/TestSocketAdapterCSV.java
You need to declare your event type(s) in either Java, or through Esper's EPL statements.
The reason why you are getting exception is because your type is not defined.
Then you can start sending events by specifying type you are sending in HTTP request. For example, here is a bit of code in python:
import urllib
cepurl = "http://localhost:8084"
param = urllib.urlencode({'stream':'DataEvent',
'date': datetime.datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%SZ"),
'src':data["ipsrc"],
'dst':data["ipdst"],
'type':data["type"]})
# sending event:
f = urllib.urlopen(cepurl + "/sendevent?" + param);
rez = f.read()
in java this probably would be something like this:
SupportHTTPClient client = new SupportHTTPClient();
client.request(8084, "sendevent", "stream", "DataEvent", "date", "mydate");
//StockPriceEmitter is a "dead loop" thread which generate data, and invoke StockPriceService.onUpdates() to send data.
#Service
public class StockPriceService implements StockPriceEmitter.Listener
{
#Inject
private BayeuxServer bayeuxServer;
#Session
private LocalSession sender;
public void onUpdates(List<StockPriceEmitter.Update> updates)
{
for (StockPriceEmitter.Update update : updates)
{
// Create the channel name using the stock symbol
String channelName = "/stock/" + update.getSymbol().toLowerCase(Locale.ENGLISH);
// Initialize the channel, making it persistent and lazy
bayeuxServer.createIfAbsent(channelName, new ConfigurableServerChannel.Initializer()
{
public void configureChannel(ConfigurableServerChannel channel)
{
channel.setPersistent(true);
channel.setLazy(true);
}
});
// Convert the Update business object to a CometD-friendly format
Map<String, Object> data = new HashMap<String, Object>(4);
data.put("symbol", update.getSymbol());
data.put("oldValue", update.getOldValue());
data.put("newValue", update.getNewValue());
// Publish to all subscribers
ServerChannel channel = bayeuxServer.getChannel(channelName);
channel.publish(sender, data, null); // this code works fine
//this.sender.getServerSession().deliver(sender, channel.getId(), data, null); // this code does not work
}
}
}
this line channel.publish(sender, data, null); // this code works fine works fine, now I don't want channel to publish message to all clients subscirbed with it, I want to send to a specific client, so I write this this.sender.getServerSession().deliver(sender, channel.getId(), data, null);, but it does not work, browser can't get message.
thx in advance.
I strongly recommend that you spend some time reading the CometD concepts page, in particular the section about sessions.
Your code does not work because you are sending the message to the sender, not to the recipient.
You need to pick which remote ServerSession you want to send the message to among the many that may be connected to your server, and call serverSession.deliver(...) on that remote ServerSession.
How to pick the remote ServerSession depends on your application.
For example:
for (ServerSession session : bayeuxServer.getSessions())
{
if (isAdminUser(session))
session.deliver(sender, channel.getId(), data, null);
}
You have to provide an implementation of isAdmin(ServerSession) with your logic, of course.
Note that you don't need to iterate over the sessions: if you happen to know the session id to deliver to, you can do:
bayeuxServer.getSession(sessionId).deliver(sender, channel.getId(), data, null);
Also refer to the CometD chat demo shipped with the CometD distribution, that contain a full fledged example of how to send a message to particular session.