static void Main(string[] args)
{
int domain = DDS.DomainId.Default;
/* Create a DomainParticipant */
DomainParticipantFactory dpf = DomainParticipantFactory.Instance;
IDomainParticipant participant = dpf.CreateParticipant(
domain,
null,
StatusKind.Any);
ErrorHandler.checkHandle(
participant, "DDS.DomainParticipantFactory.CreateParticipant");
/* Register the required datatype for ChatMessage. */
ChatMessageTypeSupport chatMessageTS = new ChatMessageTypeSupport();
string chatMessageTypeName = chatMessageTS.TypeName;
ReturnCode status = chatMessageTS.RegisterType(
participant, chatMessageTypeName);
ErrorHandler.checkStatus(
status, "Chat.ChatMessageTypeSupport.RegisterType");
/* Register the required datatype for NameService. */
NameServiceTypeSupport nameServiceTS = new NameServiceTypeSupport();
ErrorHandler.checkHandle(
nameServiceTS, "new NameServiceTypeSupport");
string nameServiceTypeName = nameServiceTS.TypeName;
status = nameServiceTS.RegisterType(
participant, nameServiceTypeName);
ErrorHandler.checkStatus(
status, "Chat.NameServiceTypeSupport.RegisterType");
/* Set the ReliabilityQosPolicy to RELIABLE. */
TopicQos reliableTopicQos = new TopicQos();
status = participant.GetDefaultTopicQos(ref reliableTopicQos);
ErrorHandler.checkStatus(
status, "DDS.DomainParticipant.get_DefaultTopicQos");
reliableTopicQos.Reliability.Kind = ReliabilityQosPolicyKind.ReliableReliabilityQos;
/* Make the tailored QoS the new default. */
status = participant.SetDefaultTopicQos(reliableTopicQos);
ErrorHandler.checkStatus(
status, "DDS.DomainParticipant.SetDefaultTopicQos");
/* Use the changed policy when defining the ChatMessage topic */
ITopic chatMessageTopic = participant.CreateTopic(
"Chat_ChatMessage",
chatMessageTypeName,
reliableTopicQos);
ErrorHandler.checkHandle(
chatMessageTopic,
"DDS.DomainParticipant.CreateTopic (ChatMessage)");
/* Set the DurabilityQosPolicy to TRANSIENT. */
TopicQos settingTopicQos = new TopicQos();
status = participant.GetDefaultTopicQos(ref settingTopicQos);
ErrorHandler.checkStatus(
status, "DDS.DomainParticipant.GetDefaultTopicQos");
settingTopicQos.Durability.Kind = DurabilityQosPolicyKind.TransientDurabilityQos;
/* Create the NameService Topic. */
ITopic nameServiceTopic = participant.CreateTopic(
"Chat_NameService",
nameServiceTypeName,
settingTopicQos);
ErrorHandler.checkHandle(
nameServiceTopic, "DDS.DomainParticipant.CreateTopic");
/* Adapt the default SubscriberQos to read from the
* "ChatRoom" Partition. */
SubscriberQos subQos = new SubscriberQos();
status = participant.GetDefaultSubscriberQos(ref subQos);
ErrorHandler.checkStatus(
status, "DDS.DomainParticipant.GetDefaultSubscriberQos");
subQos.Partition.Name = new string[1];
subQos.Partition.Name[0] = "ChatRoom";
/* Create a Subscriber for the UserLoad application. */
ISubscriber chatSubscriber = participant.CreateSubscriber(subQos);
ErrorHandler.checkHandle(
chatSubscriber, "DDS.DomainParticipant.CreateSubscriber");
/* Create a DataReader for the NameService Topic
* (using the appropriate QoS). */
DataReaderQos nsQos = null;
status = chatSubscriber.GetDefaultDataReaderQos(ref nsQos);
ErrorHandler.checkStatus(
status, "DDS.Subscriber.GetDefaultDataReaderQos");
status = chatSubscriber.CopyFromTopicQos(ref nsQos, settingTopicQos);
ErrorHandler.checkStatus(
status, "DDS.Subscriber.CopyFromTopicQos");
IDataReader parentReader = chatSubscriber.CreateDataReader(
nameServiceTopic,
nsQos,
null,
StatusKind.Any);
ErrorHandler.checkHandle(
parentReader, "DDS.Subscriber.CreateDatareader (NameService)");
NameServiceDataReader nameServer = parentReader as NameServiceDataReader;
/* Adapt the DataReaderQos for the ChatMessageDataReader to
* keep track of all messages. */
DataReaderQos messageQos = new DataReaderQos();
status = chatSubscriber.GetDefaultDataReaderQos(ref messageQos);
ErrorHandler.checkStatus(
status, "DDS.Subscriber.GetDefaultDataReaderQos");
status = chatSubscriber.CopyFromTopicQos(
ref messageQos, reliableTopicQos);
ErrorHandler.checkStatus(
status, "DDS.Subscriber.CopyFromTopicQos");
messageQos.History.Kind = HistoryQosPolicyKind.KeepAllHistoryQos;
/* Create a DataReader for the ChatMessage Topic
* (using the appropriate QoS). */
parentReader = chatSubscriber.CreateDataReader(
chatMessageTopic,
messageQos);
ErrorHandler.checkHandle(
parentReader, "DDS.Subscriber.CreateDataReader (ChatMessage)");
/* Narrow the abstract parent into its typed representative. */
ChatMessageDataReader loadAdmin = parentReader as ChatMessageDataReader;
/* Initialize the Query Arguments. */
string[] parameters = { "0" };
/* Create a QueryCondition that will contain all messages
* with userID=ownID */
IQueryCondition singleUser = loadAdmin.CreateQueryCondition("userID=%0", parameters);
ErrorHandler.checkHandle(singleUser, "DDS.DataReader.CreateQuerycondition");
/* Create a ReadCondition that will contain new users only */
IReadCondition newUser = nameServer.CreateReadCondition(SampleStateKind.NotRead, ViewStateKind.New, InstanceStateKind.Alive);
ErrorHandler.checkHandle(newUser, "DDS.DataReader.create_readcondition");
/* Obtain a StatusCondition that triggers only when a Writer
* changes Liveliness */
IStatusCondition leftUser = loadAdmin.StatusCondition;
ErrorHandler.checkHandle(leftUser, "DDS.DataReader.GetStatusCondition");
status = leftUser.SetEnabledStatuses(StatusKind.LivelinessChanged);
ErrorHandler.checkStatus(status, "DDS.StatusCondition.SetEnabledStatuses");
/* Create a bare guard which will be used to close the room */
escape = new GuardCondition();
/* Create a waitset and add the ReadConditions */
WaitSet userLoadWS = new WaitSet();
status = userLoadWS.AttachCondition(newUser);
ErrorHandler.checkStatus(status, "DDS.WaitSet.AttachCondition (newUser)");
status = userLoadWS.AttachCondition(leftUser);
ErrorHandler.checkStatus(status, "DDS.WaitSet.AttachCondition (leftUser)");
status = userLoadWS.AttachCondition(escape);
ErrorHandler.checkStatus(status, "DDS.WaitSet.AttachCondition (escape)");
/* Initialize and pre-allocate the GuardList used to obtain
* the triggered Conditions. */
ICondition[] guardList = new ICondition[3];
/* Remove all known Users that are not currently active. */
NameService[] nsMsgs = null;
SampleInfo[] nsInfos = null;
status = nameServer.Take(ref nsMsgs,
ref nsInfos,
Length.Unlimited,
SampleStateKind.Any,
ViewStateKind.Any,
InstanceStateKind.NotAlive);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.Take");
status = nameServer.ReturnLoan(ref nsMsgs, ref nsInfos);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.ReturnLoan");
/* Start the sleeper thread. */
new Thread(new UserLoad().doWait).Start();
bool closed = false;
int prevCount = 0;
ChatMessage[] msgs = null;
SampleInfo[] msgInfos = null;
while (!closed)
{
/* Wait until at least one of the Conditions in the
* waitset triggers. */
status = userLoadWS.Wait(ref guardList, Duration.Infinite);
ErrorHandler.checkStatus(status, "DDS.WaitSet.Wait");
/* Walk over all guards to display information */
foreach (ICondition guard in guardList)
{
if (guard == newUser)
{
/* The newUser ReadCondition contains data */
status = nameServer.ReadWithCondition(ref nsMsgs, ref nsInfos, newUser);
ErrorHandler.checkStatus(status, "Chat.NameServiceDataReader.read_w_condition");
foreach (NameService ns in nsMsgs)
{
Console.WriteLine("New user: "******"Chat.NameServiceDataReader.ReturnLoan");
}
else if (guard == leftUser)
{
// Some liveliness has changed (either a DataWriter
// joined or a DataWriter left)
LivelinessChangedStatus livelinessStatus = new LivelinessChangedStatus();
status = loadAdmin.GetLivelinessChangedStatus(ref livelinessStatus);
ErrorHandler.checkStatus(status, "DDS.DataReader.getLivelinessChangedStatus");
if (livelinessStatus.AliveCount < prevCount)
{
/* A user has left the ChatRoom, since a DataWriter
* lost its liveliness. Take the effected users
* so they will not appear in the list later on. */
status = nameServer.Take(
ref nsMsgs,
ref nsInfos,
Length.Unlimited,
SampleStateKind.Any,
ViewStateKind.Any,
InstanceStateKind.NotAliveNoWriters);
ErrorHandler.checkStatus(status, "Chat.NameServiceDataReader.Take");
foreach (NameService nsMsg in nsMsgs)
{
/* re-apply query arguments */
parameters[0] = nsMsg.userID.ToString();
status = singleUser.SetQueryParameters(parameters);
ErrorHandler.checkStatus(status, "DDS.QueryCondition.SetQueryParameters");
/* Read this user's history */
status = loadAdmin.TakeWithCondition(
ref msgs,
ref msgInfos,
singleUser);
ErrorHandler.checkStatus(
status,
"Chat.ChatMessageDataReader.TakeWithCondition");
/* Display the user and his history */
Console.WriteLine("Departed user {0} has sent {1} messages ", nsMsg.name, msgs.Length);
status = loadAdmin.ReturnLoan(ref msgs, ref msgInfos);
ErrorHandler.checkStatus(status, "Chat.ChatMessageDataReader.ReturnLoan");
}
status = nameServer.ReturnLoan(ref nsMsgs, ref nsInfos);
ErrorHandler.checkStatus(status, "Chat.NameServiceDataReader.ReturnLoan");
}
prevCount = livelinessStatus.AliveCount;
}
else if (guard == escape)
{
Console.WriteLine("UserLoad has terminated.");
closed = true;
}
else
{
//System.Diagnostics.Debug.Fail("Unknown Condition");
}
} /* for */
} /* while (!closed) */
/* Remove all Conditions from the WaitSet. */
status = userLoadWS.DetachCondition(escape);
ErrorHandler.checkStatus(status, "DDS.WaitSet.DetachCondition (escape)");
status = userLoadWS.DetachCondition(leftUser);
ErrorHandler.checkStatus(status, "DDS.WaitSet.DetachCondition (leftUser)");
status = userLoadWS.DetachCondition(newUser);
ErrorHandler.checkStatus(status, "DDS.WaitSet.DetachCondition (newUser)");
/* Free all resources */
status = participant.DeleteContainedEntities();
ErrorHandler.checkStatus(status, "DDS.DomainParticipant.DeleteContainedEntities");
status = dpf.DeleteParticipant(participant);
ErrorHandler.checkStatus(status, "DDS.DomainParticipantFactory.DeleteParticipant");
}
public void OnDataAvailable(IDataReader the_reader)
{
previous = -1;
/* Take all messages. */
ReturnCode status = chatMessageDR.Take(
ref messages,
ref infoSeq1,
SampleStateKind.Any,
ViewStateKind.Any,
InstanceStateKind.Any);
ErrorHandler.checkStatus(
status, "Chat.ChatMessageDataReader.take");
/* For each message, extract the key-field and find
* the corresponding name. */
for (int i = 0; i < messages.Length; i++)
{
if (infoSeq1[i].ValidData)
{
/* Find the corresponding named message. */
if (messages[i].userID != previous)
{
previous = messages[i].userID;
nameFinderParams[0] = previous.ToString();
status = nameFinder.SetQueryParameters(nameFinderParams);
ErrorHandler.checkStatus(
status, "DDS.QueryCondition.SetQueryParameters");
status = nameServiceDR.ReadWithCondition(
ref names,
ref infoSeq2,
nameFinder);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.ReadWithCondition");
/* Extract Name (there should only be one result). */
if (status == ReturnCode.NoData)
{
userName = "******" + previous;
}
else
{
userName = names[0].name;
}
/* Release the name sample again. */
status = nameServiceDR.ReturnLoan(ref names, ref infoSeq2);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.return_loan");
}
/* Write merged Topic with userName instead of userID. */
joinedSample.userName = userName;
joinedSample.userID = messages[i].userID;
joinedSample.index = messages[i].index;
joinedSample.content = messages[i].content;
status = namedMessageDW.Write(joinedSample);
ErrorHandler.checkStatus(
status, "Chat.NamedMessageDataWriter.write");
}
}
status = chatMessageDR.ReturnLoan(ref messages, ref infoSeq1);
ErrorHandler.checkStatus(
status, "Chat.ChatMessageDataReader.return_loan");
}
public void OnDataAvailable(IDataReader the_reader)
{
int count = 0;
previous = -1;
/* Take all messages. */
ReturnCode status = chatMessageDR.Take(
ref messages,
ref infoSeq1,
SampleStateKind.Any,
ViewStateKind.Any,
InstanceStateKind.Any);
ErrorHandler.checkStatus(
status, "Chat.ChatMessageDataReader.take");
/* For each message, extract the key-field and find
* the corresponding name. */
for (int i = 0; i < messages.Length; i++)
{
if (infoSeq1[i].ValidData)
{
/* Find the corresponding named message. */
if (messages[i].userID != previous)
{
previous = messages[i].userID;
nameFinderParams[0] = previous.ToString();
status = nameFinder.SetQueryParameters(nameFinderParams);
ErrorHandler.checkStatus(
status, "DDS.QueryCondition.SetQueryParameters");
/* To ensure the identifier for the sender is presented with the message
* content, it may be necessary to try reading again if the NameService
* sample is not initially available. This is because the arrival order
* of samples representing different topics cannot be guaranteeed.
*/
status = ReturnCode.NoData;
while (status == ReturnCode.NoData && count < 10)
{
status = nameServiceDR.ReadWithCondition(
ref names,
ref infoSeq2,
nameFinder);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.ReadWithCondition");
/* Extract Name (there should only be one result). */
if (status == ReturnCode.NoData)
{
userName = "******" + previous;
/* Sleep for some amount of time, as not to consume too much CPU cycles. */
System.Threading.Thread.Sleep(100);
count++;
}
else
{
userName = names[0].name;
/* Release the name sample again. */
status = nameServiceDR.ReturnLoan(ref names, ref infoSeq2);
ErrorHandler.checkStatus(
status, "Chat.NameServiceDataReader.return_loan");
}
}
}
/* Write merged Topic with userName instead of userID. */
joinedSample.userName = userName;
joinedSample.userID = messages[i].userID;
joinedSample.index = messages[i].index;
joinedSample.content = messages[i].content;
status = namedMessageDW.Write(joinedSample);
ErrorHandler.checkStatus(
status, "Chat.NamedMessageDataWriter.write");
}
}
status = chatMessageDR.ReturnLoan(ref messages, ref infoSeq1);
ErrorHandler.checkStatus(
status, "Chat.ChatMessageDataReader.return_loan");
}