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• Java Scheduling Calendar

  - by cedric

  Hi. I have a j2ee web application which supports scheduling of execution of jobs. I am looking for a free calendar component written in java which allows scheduling functionalities as well as capable of changing view mode of tasks either by viewing taks for whole year, month view, week view, day view. Do you have any suggestion. Im sorry something came up with the implementation. I dnt have to use this calendar for triggering or calling jobs. I just need to retrieve schedules from database and display it in diff view modes. SO it's just some kind of GUI functionality

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• Sending information back from delegate [iPhone]

  - by Andy

  I'm using NSXMLParser in my RootViewController.m file. NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:response_data]; [xmlParser setDelegate:self]; [xmlParser parse]; [xmlParser release]; I'm also implementing this method to add entries to a dictionary defined in RootViewController.m for later use: - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict However, I'd like to get more than one XML file and do different things when the file has finished; this sounds like I need to use external files as delegates. My question is: If I have the following implementation files (& their header files): RootViewController.m XMLDelegate1.m XMLDelegate2.m and set the ith NSXMLParser delegate to be XMLDelegatei.m, and get those files to return an NSDictionary that I can then add to the NSDictionary defined in RootViewController.m. I guess there are two methods of doing this: Use a method that I don't know about; or Use a better workflow I suspect it's 2, but hope it's 1. Thanks, Andy

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• "Circuit breaker" for net.msmq?

  - by Alex

  Hi, The Circuit Breaker pattern, from the book Release It!, protects a service from requests while it is failing (or recovering). The net.msmq binding used with transactions give us nice retry and poison message capabilities. But I am missing the implementation of such a "Circuit breaker" pattern. A service is put under even heavier load by retries while it is already in a failure condition (like DB connectivity issues causing loads of blocked threads etc.). Anyone knows about a behavior extension or similar that explicitly closes the service host when defined failure thresholds have been exceeded? Cheers, Alex

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• Choosing the non-empty Monoid

  - by Nikita Volkov

  I need a function which will choose a non-empty monoid. For a list this will mean the following behaviour: > [1] `mor` [] [1] > [1] `mor` [2] [1] > [] `mor` [2] [2] Now, I've actually implemented it but am wondering wether there exists some standard alternative, because it seems to be a kind of a common case. Unfortunately Hoogle doesn't help. Here's my implementation: mor :: (Eq a, Monoid a) => a -> a -> a mor a b = if a /= mempty then a else b

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• Remove all references to a DLL across all application domains

  - by ck

  I have a web application that dynamically loads assemblies based on database configuration entries to perform certain actions (dynamic plugin style architecture). The calls to the objects are in a Factory Pattern implementation, and the object is cached (in a static dictionary< within the Factory) as the calls can be made many thousands of times in a minute. The calls to this factory are made from both the main web application and a number of webservices, some in different assemblies/projects. When I need to update one of these DLLs, I have to recycle IIS to get the DLL released. As this has an impact on another application on the server, I wanted to know if there was a way I could release the DLL without restarting IIS?

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• Bi-directional communication with 1 socket - how to deal with collisions?

  - by Zwei Steinen

  Hi, I have one app. that consists of "Manager" and "Worker". Currently, the worker always initiates the connection, says something to the manager, and the manager will send the response. Since there is a LOT of communication between the Manager and the Worker, I'm considering to have a socket open between the two and do the communication. I'm also hoping to initiate the interaction from both sides - enabling the manager to say something to the worker whenever it wants. However, I'm a little confused as to how to deal with "collisions". Say, the manager decides to say something to the worker, and at the same time the worker decides to say something to the manager. What will happen? How should such situation be handled? P.S. I plan to use Netty for the actual implementation. Thank you very much in advance!

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• CRSF token and Session replication with Tomcat and Apache

  - by technocool

  I have an J2EE compliant web application. I use a session based token to append a secondary id to all incoming link generated by my application. To prevent my application against CSRF attack, I validate the secondary id before I allow the user session to work off the subsequent page. Recently, while working with session replication mechanism implementation, I observed that on session failover, the generated secodary id is lost and the user get re directed to the login page/default page. Any suggestions on how I can ensure that the my generated secondary token id is not lost from the replicated session?

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• ASP.NET forgets dlls in bin directory

  - by Timothy Strimple

  We have a plugin system on a WCF service that checks libraries placed in the bin folder for certain assembly level attributes and loads them. This allows customization of certain service calls based on which client is making the call. This works great most of the time. However, sometimes it seems to lose the dll, which causes the service to revert back to the default implementation for every client. The solution so far has been to just move the dll file out of the bin folder, and back in. This causes asp.net to pick up the file and customizations start working again. I'm at a loss for why the assembly is getting missed like that after a certain amount of time. Any ideas as to what might be causing this?

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• Does any faster centralized version control than SVN exists?

  - by Savageman

  Hello, I've been using SVN since a long time and now we're trying on Git. I'm not talking on the centralized / decentralized debate here. My only concern is speed. The latter tool is much faster. But sometimes, I NEED to work with a centralized approach, which is much more simple and less complex than the decentralized one. The learning curve is really fast, which saves a lot of time (while digging into decentralized would lead to a waste of time, given the learning curve is much longer and we encounter more problem when working with it). However, SVN is really slow compared to GIT, and I don't think it has anything to do with the centralized argument. Decentralized systems also have to deal with server connections and file transfert. So I can easilly imagine a faster implementation of centralized version control could exists. Does someone has any clue on this?

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• Web UI for showing like/dislike community comments side-by-side

  - by Justin Grant

  We want to add a comments/reviews feature to our website's plugin gallery, so users can not only vote up or down a particular plugin, but also leave an optional short comment about what they liked or didn't like about it. I'm looking for inspiration, ideally a good implementation elsewhere on the web which isn't annoying to end users, isn't impossibly complex to develop, and which enables users to see both good and bad comments side-by-side, like this: Like: 57 votes Dislike: 8 votes --------------------------------- -------------------------------- "great plugin, saved me hours..." "hard to install" "works well on MacOS and Ubuntu" "Broken on Windows Vista with UAC enabled" "integrates well with version 3.2" More... More... Anyone know a site which does something like this?

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• How to know if a detached JPA entity has already been persisted or not ?

  - by snowflake

  I have a JPA entity instance in the web UI layer of my application. I'd like to know at anytime if this entity has been already persisted in database or if it is only present in the user session. It would be in the business layer, I would use entitymanager.contains(Entity) method, but in my UI layer I think I need an extra attribute indicating whether the entity has been saved or not. How implement that ? I'm considering following option for the moment: - a JPA attribute with a default value set by the database, but would force a new read after each update ? - a non JPA attribute manually set in my code or automatically set by JPA? Any advice / other suggestions ? I'm using JPA 1 with Hibernate 3.2 implementation and would prefer stick to the standard.

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• custom DB logging using enterprise library 4.1

  - by Rohit

  We have to create a historical log of all the changed entities. we have defined our custom tables for this purpose. I have to incorporate this tables in Enterprise library logging block and do logging in these tables. I need to write a SP to insert values to these tables. Till now,what i have got from google is that i have to create a listener inheriting from CustomTraceListener and give my implementation of WriteMessage. What i need to know is,how will i plug my tables and SP in Enterprise library logging block.

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• Programming for a 32-bit environment vs programming for a 64-bit environment / Build configurations

  - by Russel

  I was looking at some same code (a sample MS Visual Studio C++ project) recently with multiple build configurations (Release/Debug, Win32/x64). My question: What is the difference? I guess I understand Release/Debug (Release = finalized version of project, Debug = version used to run in debugger), but what things need to be considered when building different versions for Win32/x64 platforms? Is there any coding differences, or does this just affect how that same code is ultimately built into machine code? I know there are different library files depending on whether you're using a 32-bit or 64-bit system as well... Are all of these differences again just machine code? Would a 32-bit library file and its corresponding 64-bit library file be two files with exactly the same functions build from the same source code originally, and only differing in their machine code implementation? Thanks! --Russel

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• Implementing operator< in C++

  - by Vulcan Eager

  I have a class with a few numeric fields such as: class Class1 { int a; int b; int c; public: // constructor and so on... bool operator<(const Class1& other) const; }; I need to use objects of this class as a key in an std::map. I therefore implement operator<. What is the simplest implementation of operator< to use here?

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• asp.net membership provider api. usability. best-practice

  - by Andrew Florko

  Hello everybody, Membership/Role/Profile providers API appeared in early days of asp.net Nearly everytime I can't live with standard API & have to add some extra functionality (for sorting, retrieving e.t.c.). I also have to use different database structure often (with foreign key to some tables for example) or think about performance improvements. These considerations forced teams I took part in to build own providers but I can't stand to implement providers API (because we don't use 70% of standard functionality at least). Moreover, providers that were built for exact projects were rarely reused. I wonder if someone found swiss-knife early-days-API providers implementation that is usefull for any kind of project without refactoring... Or do you use your own implementations of early-days-API's Or may be you abandon standard architecture and use lightweight implementations ? Thank you in advance

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• Reverse Breadth First traversal in C#

  - by Ngu Soon Hui

  Anyone has a ready implementation of the Reverse Breadth First traversal algorithm in C#? By Reverse Breadth First traversal , I mean instead of searching a tree starting from a common node, I want to search the tree from the bottom and gradually converged to a common node. Let's see the below figure, this is the output of a Breadth First traversal : In my reverse breadth first traversal , 9,10,11 and 12 will be the first few nodes found ( the order of them are not important as they are all first order). 5, 6, 7 and 8 are the second few nodes found, and so on. 1 would be the last node found. Any ideas or pointers? Edit: Change "Breadth First Search" to "Breadth First traversal" to clarify the question

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• Is there a module that implements an efficient array type in Erlang?

  - by dsmith

  I have been looking for an array type with the following characteristics in Erlang. append(vector(), term()) O(1) nth(Idx, vector()) O(1) set(Idx, vector(), term()) O(1) insert(Idx, vector(), term()) O(N) remove(Idx, vector()) O(N) I normally use a tuple for this purpose, but the performance characteristics are not what I would want for large N. My testing shows the following performance characteristics... erlang:append_element/2 O(N). erlang:setelement/3 O(N). I have started on a module based on the clojure.lang.PersistentVector implementation, but if it's already been done I won't reinvent the wheel.

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• Java JAX-WS web-service client: how log request & response xml ?

  - by EugeneP

  I created an implementation of LoggingHandler that implements SOAPHandler It should log whenever handleMessage triggers. [ And it is never called in my case ] then : MyService service = new MyService(); MyServicePort port = service.getPortType(); now I try this: BindingProvider bindingProvider = (BindingProvider)port; bindingProvider.getBinding().getHandlerChain().add(new LoggingHandler()); I do not see any request / response xml though. Can you suggest any solution? Maybe there's other way to see output and request xml s ?

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• Can SHA-1 algorithm be computed on a stream? With low memory footprint?

  - by raoulsson

  I am looking for a way to compute SHA-1 checksums of very large files without having to fully load them into memory at once. I don't know the details of the SHA-1 implementation and therefore would like to know if it is even possible to do that. If you know the SAX XML parser, then what I look for would be something similar: Computing the SHA-1 checksum by only always loading a small part into memory at a time. All the examples I found, at least in Java, always depend on fully loading the file/byte array/string into memory. If you even know implementations (any language), then please let me know!

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• Can an out-of-process COM object determine its parent process?

  - by Tom Williams

  From an out-of-process COM object (LocalServer32) can I determine the client process that requested the creation of the object? - to be specific I need to get hold of the client processes command line. This question arrises because (due to poor standardisation, implementation and support) the potential 3rd party clients of the object have a variety of idiosyncracies which the object needs to workaround. To do this the object needs to be able to identify its current client. Extending the interface of the COM object so that the client can identify itself is unfortunately not possible ... or to be more precise the interface can be extended but I won't be able to get the clients to call the extension.

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• Difference in techniques for setting a stubbed method's return value with Rhino Mocks

  - by CRice

  What is the main difference between these following two ways to give a method some fake implementation? I was using the second way fine in one test but in another test the behaviour can not be achieved unless I go with the first way. These are set up via: IMembershipService service = test.Stub<IMembershipService>(); so (the first), using (test.Record()) //test is MockRepository instance { service.GetUser("dummyName"); LastCall.Return(new LoginUser()); } vs (the second). service.Stub(r => r.GetUser("dummyName")).Return(new LoginUser()); Edit The problem is that the second technique returns null in the test, when I expect it to return a new LoginUser. The first technique behaves as expected by returning a new LoginUser. All other test code used in both cases is identical.

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• How should I call the operation that limit a string's length?

  - by egarcia

  This is a language-agnostic question - unless you count English as a language. I've got this list of items which can have very long names. For aesthetic purposes, these names must be made shorter in some cases, adding dots (...) to indicate that the name is longer. So for example, if article.name returns this: lorem ipsum dolor sit amet I'd like to get this other output. lorem ipsum dolor ... I can program this quite easily. My question is: how should I call that shortening operation? I mean the name, not the implementation. Is there a standard English name for it?

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• What is the best approach to write test cases using sentestinkit in iPhone / iPad ?

  - by Madhup

  I am developing an application for iPad application. I need to perform unit testing in the application, but I am not sure why I should do unit testing in this application. Edit: And since the iPhone SenTestingKit is not well documented, the implementation and writing test cases is so time consuming. So why should we waste time with this? Also if we have to what would be the best approach to write the test cases? My focus is on the second question. So please answer more for the second part, I would be very pleased.

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• C: getopt with list of acceptable optarg. What is the best practise ?

  - by Xavier Maillard

  Hi, I am writing a C program which is a frontend to a myriad tools. This fronted will be launched like this: my-frontend --action <AN ACTION> As all the tools have the same prefix, let say for this example this prefix is "foo". I want to concatenate "AN ACTION" to this prefix and exec this (if the tool exists). I have written something but my implementation uses strcmp to test that "AN ACTION" is a valid action. Even if this works, I do not like it. So I am looking for a nicer solution that would do the same. The list of possibilities is pretty small (less than 10) and static (the list is "hardcoded") but I am sure there is a more "C-ish" way to do this (using a struct or something like that). As I am not a C expert, I am asking for your help. Regards

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• Any ideas for developing a Risc Processor friendly string allocator?

  - by Richard Fabian

  I'm working on some tools to enable high throughput data-oriented development, and one thing that I've not got an immediate answer for is how you go about allocating strings quickly. On risc processors you've got another problem of implementation that the CPU doesn't like branching, which is what I'm trying to minimise or avoid. Also, cache coherence is important on most CPUs, so that's gotta be influential in the design too. So, how would you go about reducing the overhead for a generic string allocator? Sometimes it's easier to solve a more explicit problem, so any ideas for string sizes of 5-30?

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