In the project I am assigned to do, it involves reading details of products from Info Engine using a Java Interface. How to do it? Suggest me tutorials or books or anything that helps me get started.
You can do that by implementing ComponentDataBuilder and that will return
a well populated IeTaskInfo object. It takes the action name as the constructor which gives information of the
task that need to be executed to get the data For example, the following code
snippet demonstrates the use of the “jca-Search” task .
public class MyDataBuilderWithIETask implements ComponentDataBuilder {
#Override
public Object buildComponentData(ComponentConfig config,
ComponentParams params) throws WTException {
//pass the task name as constructor
IeTaskInfo taskInfo = new IeTaskInfo("jca-Search");
……..
return taskInfo;
}
}
For more info please refer
Info*Engine User's Guide
Windchill Adapter Guide (Info*Engine)
Related
I'm trying to implement an RSS/Atom feed aggregator in spring-integration and I am primarily using the Java DSL to write my IntegrationFlow. A requirement of this aggregator is that feeds can be added / removed during runtime. That is to say, the feeds are not known at design time.
I found it simple to use the basic Feed.inboundAdapter() with a test url and extract the links out of the feed with a transformer and then pass it on to an outbound-file-adapter to save the links to a file. However, I have gotten very stuck when trying to read the (thousands) of feed urls from an inbound-file-adapter run the file through a FileSplitter and then pass each resulting Message<String> containing the feed url to then register a new Feed.inboundAdapter(). Is this not possible with the Java DSL?
Ideally I would love it if I could do the following:
#Bean
public IntegrationFlow getFeedsFromFile() throws MalformedURLException {
return IntegrationFlows.from(inboundFileChannel(), e -> e.poller(Pollers.fixedDelay(10000)))
.handle(new FileSplitter())
//register new Feed.inboundAdapter(payload.toString()) foreach Message<String> containing feed url coming from FileSplitter
.transform(extractLinkFromFeedEntry())
.handle(appendLinkToFile())
.get();
}
Though after reading through the spring integration java DSL code multiple times (and learning a tonne of stuff along the way) I just can't see that it's possible to do it this way. So... A) is it? B) should it be? C) Suggestions?
It almost feels like I should be able to take the output of .handle(new FileSplitter()) and pass that into .handleWithAdapter(Feed.inboundAdapter(/*stuff here*/)) but the DSL only references outbound-adapters there. Inbound adapters are really just a subclass of AbstractMessageSource and it seems the only place you can specify one of those is as an argument to the IntegrationFlows.from(/*stuff here*/) method.
I would have thought it would be possible to take the input from a file, split it line by line, use that output to register inbound feed adapters, poll those feeds, extract the new links from feeds as they appear and append them to a file. It appears as though it's not.
Is there some clever subclassing I can do to make this work??
Failing that... and I suspect this is going to be the answer, I found the spring integration Dynamic Ftp Channel Resolver Example and this answer on how to adapt it dynamically register stuff for the inbound case...
So is this the way to go? Any help/guidance appreciated. After pouring over the DSL code and reading documentation for days, I think I'll have a go at implementing the dynamic ftp example and adapting it to work with FeedEntryMessageSource... in which case my question is... that dynamic ftp example works with XML configuration, but is it possible to do it with either Java config or the Java DSL?
Update
I've implemented the solution as follows:
#SpringBootApplication
class MonsterFeedApplication {
public static void main(String[] args) throws IOException {
ConfigurableApplicationContext parent = SpringApplication.run(MonsterFeedApplication.class, args);
parent.setId("parent");
String[] feedUrls = {
"https://1nichi.wordpress.com/feed/",
"http://jcmuofficialblog.com/feed/"};
List<ConfigurableApplicationContext> children = new ArrayList<>();
int n = 0;
for(String feedUrl : feedUrls) {
AnnotationConfigApplicationContext child = new AnnotationConfigApplicationContext();
child.setId("child" + ++n);
children.add(child);
child.setParent(parent);
child.register(DynamicFeedAdapter.class);
StandardEnvironment env = new StandardEnvironment();
Properties props = new Properties();
props.setProperty("feed.url", feedUrl);
PropertiesPropertySource pps = new PropertiesPropertySource("feed", props);
env.getPropertySources().addLast(pps);
child.setEnvironment(env);
child.refresh();
}
System.out.println("Press any key to exit...");
System.in.read();
for (ConfigurableApplicationContext child : children) {
child.close();
}
parent.close();
}
#Bean
public IntegrationFlow aggregateFeeds() {
return IntegrationFlows.from("feedChannel")
.transform(extractLinkFromFeed())
.handle(System.out::println)
.get();
}
#Bean
public MessageChannel feedChannel() {
return new DirectChannel();
}
#Bean
public AbstractPayloadTransformer<SyndEntry, String> extractLinkFromFeed() {
return new AbstractPayloadTransformer<SyndEntry, String>() {
#Override
protected String transformPayload(SyndEntry payload) throws Exception {
return payload.getLink();
}
};
}
}
DynamicFeedAdapter.java
#Configuration
#EnableIntegration
public class DynamicFeedAdapter {
#Value("${feed.url}")
public String feedUrl;
#Bean
public static PropertySourcesPlaceholderConfigurer pspc() {
return new PropertySourcesPlaceholderConfigurer();
}
#Bean
public IntegrationFlow feedAdapter() throws MalformedURLException {
URL url = new URL(feedUrl);
return IntegrationFlows
.from(s -> s.feed(url, "feedTest"),
e -> e.poller(p -> p.fixedDelay(10000)))
.channel("feedChannel")
.get();
}
}
And this works IF and only IF I have one of the urls defined in application.properties as feed.url=[insert url here]. Otherwise it fails telling me 'unable to resolve property {feed.url}'. I suspect what is happening there is that the #Beans defined in DynamicFeedAdapter.java all get singletons eagerly initialized, so aside from the beans being manually created in our for loop in the main method (which work fine because they have feed.url property injected) we have a stray singleton that has been eagerly initialized and if there is no feed.url defined in application.properties then it can't resolve the property and everything goes bang. Now from what I know of Spring, I know it should be possible to #Lazy initialize the beans in DynamicFeedAdapter.java so we don't wind up with this one unwanted stray singleton problem-child. The problem is now...if I just mark the feedAdapter() #Lazy then the beans never get initialized. How do I initialize them myself?
Update - problem solved
Without having tested it, I think the problem is that boot is finding
the DynamicFeedAdapter during its component scan. A simple solution is
to move it to a sibling package. If MonsterFeedApplication is in
com.acme.foo, then put the adapter config class in com.acme.bar. That
way, boot won't consider it "part" of the application
This was indeed the problem. After implementing Gary's suggestion, everything works perfect.
See the answer to this question and its follow up for a similar question about inbound mail adapters.
In essence, each feed adapter is created in a child context that is parameterized.
In that case the child contexts are created in a main() method but there's no reason it couldn't be done in a service invoked by .handle().
I want to pass a object to workflow as input parameter, without creating instance of it, as this object is already filled up with lot of sub-objects, and I want to run lot of rules on that object. I want to use
WorkflowInvoker.Invoker(this); Is this possible in Windows Workflow Foundation 4.0, If so, what should I keep in InArguments as the type?
Thanks In Advance,
Thanks for your input....
Sorry, I think I haven't kept the question correctly, I had a business class used by bank customers, class is like this,
public partial class BankName.DTOS.clsCardDetails : BaseClass
{
public string _mBankStatusCode;
protected override string IsCreditCard(HttpContext ctx)
{
Status = ctx.Request.Form["Trans_Status"];
_mBankStatusCode = Status.ToString();
}
}
Now, I have to pass this class object to workflow foundation, I should not create new instance of this class in workflow again. Because in workflow, I want to get the status, so ideally what I thought of passing to workflow is object of "BankName.DTOS.clsCardDetails". That is my question.
InArguments<> to workflow is object of BankName.DTOS.clsCardDetails
Arguments passed into a workflow need to be put into a dictionary and the dictionary is passed into the workflow.
var dictionary = new Dictionary<string, object> { { "BankName", _bankNameObject } };
WorkflowInvoker.Invoke(this, dictionary);
The key must have the same name as your InArgument and your object must have the same type as your InArgument.
You can pass as many arguments as you like into the workflow via the dictionary.
See http://blogs.msdn.com/b/rjacobs/archive/2011/05/26/passing-arguments-to-workflow-activities-again.aspx
I'll preface this question with the following: I know there are a million posts on the internet about the old "An object with the same key already exists in the ObjectStateManager" issue. My scenario is a bit more complicated, I think.
I have a UnitOfWork class which creates a DbContext and passes it to any repository which is called. The pattern I'm using closely follows the Unit of Work tutorial on the ASP.NET site. Unlike the tutorial, my repositories take in Business entities, map them to data entities, and perform some CRUD action. My Business logic only works with Business entities. Here is what I'm trying to do in a sample Business Manager class:
_unitOfWork.Repository.Add(entity);
_unitOfWork.Save(); // context.SaveChanges() under the hood
...Perform some operations on the model...
_unitOfWork.Repository.Update(entity);
_unitOfWork.Save();
Here is a sample Update method from the repository:
public virtual void Update(entity)
{
var dataEntity = // map from business entity to data;
_context.Entry(dataEntity).State = EntityState.Modified;
}
It obviously fails on the last line. Here is where my confusion sets in:
The entity's State is Detached
When I attempt to change the State to Modified or Unchanged, it gives me the ObjectStateManager exception above.
When I attempt to detach the entity from the context (((IObjectContextAdapter)_context).ObjectContext.Detach(entity);) I get an exception about how the entity is not attached to the context, therefore, it cannot detach it. Very confusing (something fundamental I'm missing, for sure).
Many other posts suggest I make a database call, update that entity in the repository, then _unitOfWork.Save(). I don't like this approach. I shouldn't need to make an unnecessary network call to update an entity.
The Update method in the repository needs to handle two scenarios: 1) updating an entity which is not currently tracked by the context, and 2) updating an entity which IS currently tracked by the context. The second piece is what I'm struggling with.
Any help or insight is appreciated.
Thanks!
This means that there already is an object attached to the context with the same key as the new dataEntity. The existing object and the new entity both represent the same entry in the database but they are two different objects.
This may indicate that the lifespan of your _context is too long, but that's hard to judge from your code. It is certain though that the context was previously used to fetch an entity from the database that is subsequently duplicated by var dataEntity = ....
You may have to shorten the lifespan of the context, I can't tell. If you think it's OK you may want to use the Local collection to check whether the entity is already there. That will save the database round trip that Find may still make.
I found a hybrid solution which appears to work:
public virtual void Update(TB entity)
{
var dataEntity = Mapper.Map<TB, TD>(entity);
var pkey = _dbSet.Create().GetType().GetProperty("Id").GetValue(dataEntity);
var entry = _context.Entry(dataEntity);
if (entry.State == EntityState.Detached)
{
var attachedEntity = _dbSet.Find(pkey);
if (attachedEntity != null)
{
var attachedEntry = _context.Entry(attachedEntity);
attachedEntry.CurrentValues.SetValues(dataEntity);
}
else
{
entry.State = EntityState.Modified;
}
}
else
{
entry.State = EntityState.Modified;
}
}
I asked this question before which has got a very good response. But as I am new to asp.net (and jquery) cant understand how the program is flowing.
Summary:
I have created a Basic chat application. Now I am trying to add a advanced function like whenever a user is online (connected to a server), the server should show or broadcast the available online user's username to all the users connected to that server.
By referring the responses to the previous question (s0nica and VinayC), I modified my class file and jquery file, which are giving errors as shown in the below links. (I think I am very close)
Chat.cs (Two errors, I mentioned errors in between code comments)
file.js (Working fine, refer it if you need to)
Please have a look to the above files and assist me.
PS: In the previous post, I was thinking that if I change the Global.asax code, my problem will be solved.. which I realized later as wrong..
Your first error from:
Clients.joins(Context.ConnectionId, Caller.username, DateTime.Now);
Shold be:
Clients.All.joins(Context.ConnectionId, Clients.Caller.username, DateTime.Now);
Other errors associated with it: In your JS file it should be:
Line 15
chat.state.username = chatUsername;
Second error:
The error is exactly as it states, you do not have a toList function off of your dictionary object. Secondly you can't plainly convert a List or a string directly to a Chat object.
Based on your setup you currently dont have a proper "user" list to return. Right now you're saving a List to represent an individual user. You might want to try changing your dictionary object to be something like
static ConcurrentDictionary<string, User> _users = new ConcurrentDictionary<string, User>();
Where User is:
public class User
{
public string Name { get; set; }
public string ConnectionID { get; set; }
}
Then on your Joined function you could just do:
public void Joined()
{
User user = new User
{
Name = Clients.Caller.username,
ConnectionID = Context.ConnectionId
};
_users.TryAdd(user.ConnectionID, user);
Clients.All.joins(user.ConnectionID, user.Name, DateTime.Now);
}
Lastly your GetConnectedUsers would end up(make sure you're 'using System.Linq;'):
public List<User> GetConnectedUsers()
{
return _users.Values.ToList();
}
I probably went a little bit overboard but hopefully this helps!
If you need a reference to the change log from SignalR 0.5.3 to 1.0 alpha here's a great post on all of the modifications:
http://weblogs.asp.net/davidfowler/archive/2012/11/11/microsoft-asp-net-signalr.aspx
Hope somebody can help.
Have looked around on the net but cannot seem to solve (or understand) this.
I have tried the code posted at
http://blogs.msdn.com/b/kylemc/archive/2010/05/10/using-asp-net-membership-in-silverlight.aspx
(not going to repeat the class MembershipServiceUser here as it is quite long and can be seen on the mentioned page)
I have set up the domain service with the class and the code to return the users:
//[RequiresRole("Managers")]
public IEnumerable<MembershipServiceUser> GetAllUsers()
{
return Membership.GetAllUsers().Cast<MembershipUser>().Select(u => new MembershipServiceUser(u));
}
I took out the RequiresRole for testing.
What I seem to be a bit blonde about is the calling of the GetAllUsers() method.
In my code behind I am using:
MembershipDataContext context = new MembershipDataContext();
EntityQuery<MembershipServiceUser> users = context.GetAllUsersQuery();
I am not 100% sure if this is the correct way to use the method or if something else is wrong because
context.GetAllUsersQuery(); returns "Enumeration yielded no results"
One question is also in the code kylmc uses //RequiresRole("Admin")]. Is this a custom role created in the ASP.NET Configuration editor?
Looking at another tutorial regarding using the ASP.NET authentication service in Silverlight, I create a role called "Managers" and added the login user to that role.
Logging in using a user with role Managers doesn't help and results are still not yielded.
Any ideas I could possible look at?
Many thanks
Neill
There are two steps involved with querying.
Get a query object from the Domain Service context (synchronous).
Load the query from the Domain Service context (asynchronous).
Example:
public void Load()
{
// define the query
var query = context.GetAllUsersQuery();
// start running the query, and when the results return call
// OnGetAllUsersLoaded
context.Load(query, OnGetAllUsersLoaded, null);
}
public void OnGetAllUsersLoaded(LoadOperation op)
{
var results = op.Entities;
}