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• Interaction between two Clouds

  - by user7969

  I have setup the Cloud-A with 1 - [CLC+CC] and 2 - [NC] computers. I have another Cloud-B with same configuration. [using the Ubuntu Enterprise Cloud] Both of them working fine individually, in the same LAN. Now if I want to add the NC of Cloud-A to CC of Cloud-B, [in case the resources of Cloud-B are exhausted] how can I make it possible ? I guess this calls for the interoperability stuff... Could you please explain what happens exactly when we ask for instance, the direct interaction happens between the client and NC or it goes through the CLC and CC ? What I want to say is, say there are multiple cloud providers. A user is subscribed to any one of them, say Cloud-A for IaaS. As the requirements are dynamic, all the resources of Cloud-A may get exhausted. There may be another Cloud-B which can provide the services but that Cloud-A can't ask the client to go for Cloud-B. So if it is possible to have some co-ordination between this two providers to share resources mutually, making client fully unaware of whats going on in the background....? Please reply.. I am sorry if I'm doing mistake anywhere... Thanks in advance :)

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• How should I group these variables?

  - by stariz77

  I have a shape that will be defined by: char s_type; char color; double height; double width; These variables are scanned in from a request string sent to my server and passed into my printing function, which then prints out the shape. Currently they are just local variables sitting in my main(); however, I was wondering if there would be any advantage in creating a struct containing these variables, and then passing the struct to my printing function? or how else might I improve my program's structure/style, would passing a struct by reference have any kind of performance benefit if there were many requests and therefore many printing function calls? printer(char st, char cr, double ht, double wd); int main() { // Other main functionality. char s_type; char color; double height; double width; sscanf (serv_req, "GET /%c/%c/%lf/%lf", &s_type, &color, &height, &width); printer(s_type, color, height, width); // Other main functionality. return 0; } It seemed "neater" if I had a struct or something that didn't leave me with declarations in the middle of everything else going on in main. I'm interested in structure/style as well as performance. EDIT: didn't mean to put printer declaration inside main.

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• Static / Shared Helper Functions vs Built-In Methods

  - by Nathan

  This is a simple question but a design consideration that I often run across in my day to day development work. Lets say that you have a class that represents some kinds of collection. Public Class ModifiedCustomerOrders Public Property Orders as List(Of ModifiedOrders) End Class Within this class you do all kinds of important work, such as combining many different information sources and, eventually, build the Modified Customer Orders. Now, you have different processes that consume this class, each of which needs a slightly different slice of the ModifiedCustomerOrders items. To enable this, you want to add filtering functionality. How do you go about this? Do you: Add Filtering calls to the ModifiedCustomerOrders class so that you can say: MyOrdersClass.RemoveCanceledOrders() Create a Static / Shared "tooling" class that allows you to call: OrdersFilters.RemoveCanceledOrders(MyOrders) Create an extension method to accomplish the same feat as #2 but with less typing: MyOrders.RemoveCanceledOrders() Create a "Service" method that handles the getting of Orders as appropriate to the calling function, while using one of the previous approaches "under the hood". OrdersService.GetOrdersForProcessA() Others? I tend to prefer the tooling / extension method approaches as they make testing a little bit simpler. Although I dependency inject all my sourcing data into the ModifiedCustomerOrders, having it as part of the class makes it a little bit more complicated to test. Typically, I choose to use extension methods where I am doing parameterless transformations / filters. As they get more complex, I will move it into a static class instead. Thoughts on this approach? How would you approach it?

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• How to work as a team of two

  - by Ezi

  I work in a team of 2 developers, my partner is the founder of the company, in the beginning he did everything on his own. He hired me about 3 years ago to help him get things done quicker and satisfy our customer needs. Often I get small project to do all by my own, as long as it works great (and it usually does...) he doesn't care much on what I did or how I did it. But if the customer calls him up asking why something doesn't work as expected and I'm not around to forward the call to me, he could get very angry on why he doesn't have an idea on how that program works. I don't keep anything as a secret, if he asks me on something how I did it I'm happy to explain as long as he's willing to listen (which isn't long), but I don't know why I need to say it in first place, in developing software everything is written down clearly. Most of the time I work on projects he wrote and I don't need to ask him anything (it happens maybe once a month that I ask him how something works, just because I don't have the time to look it up). I've read a lot on that great site about small teams that usually means 7-12 people. I couldn't find how 2 people work as a team; we don't have project managers, reviewers or testers. I feel that the fact he don't have time to review the code on his own is not my problem, so the question here is am I doing something rung? I need to walk over to him and give him a lecture on what I did even he doesn't ask me?

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• Good practice on Visual Studio Solutions

  - by JonWillis

  Hopefully a relativity simple question. I'm starting work on a new internal project to create tractability of repaired devices within the buildings. The database is stored remotely on a webserver, and will be accessed via web API (JSON output) and protected with OAuth. The front end GUI is being done in WPF, and the business code in C#. From this, I see the different layers Presentation/Application/Datastore. There will be code for managing all the authenticated calls to the API, class to represent entities (business objects), classes to construct the entities (business objects), parts for WPF GUI, parts of the WPF viewmodels, and so on. Is it best to create this in a single project, or split them into individual projects? In my heart I say it should be multiple projects. I have done it both ways previously, and found testing to be easier with a single project solution, however with multiple projects then recursive dependencies can crop up. Especially when classes have interfaces to make it easier to test, I've found things can become awkward.

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• What is the most concise, unambiguous syntax for operator associated methods (for overloading etc.) that doesn't pollute the namespace?

  - by Doug Treadwell

  Python tends to add double underscores before its built-in or overloadable operator methods, like __add(), whereas C++ requires declaring overloaded operators as operator + (Thing& thing) { /* code */ } for example. Personally I like the operator syntax because it seems to be more explicit and keeps these operator overloading methods separated from other methods without introducing weird prefix notation. What are your thoughts? Also, what about the case of built-in methods that are needed for the programming language to work properly? Is name mangling (like adding __ prefix or sys or something) the best solution here? What do you think about having another type of method declaration, like ... "system method" for lack of creativity at the moment. So there would be two kinds of declarations: int method_name() { ... } system int method_name() { ... } ... and the call would need to be different to distinguish between them. obj.method_name(); vs obj:method_name(); perhaps, assuming a language where : can be unambiguously used in this situation. obj.method_name() vs obj.(system method_name)() Sure, the latter is ugly, but the idea is to make the common case simple and system stuff should be kept out of the way. Maybe the Objective-C notation of method calls? [obj method_name]? Are there more alternatives? Please make suggestions.

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• How much ethical is to accept second offer while serving notice period for first company? [closed]

  - by iammilind

  I had got an offer from a company X 2 months back. Though the compensation was pretty good, I asked for more. They declined and I continued my search for the best. I was expecting good companies (Y, Z) will contact me, but that din't happen. Then 2 months later, now I re-approached company X again and they issued me the same offer. I accepted it, resigned from my current company and serving the notice period (2 months). Now the twist: I got calls from Y and Z (good companies). They definitely give better compensation. If they select me then my plan is to accept the better offer from Y/Z and inform the X immediately that I have got better opportunity, so I will not be able to join the company... Is this ethical ? [Edit Note: I have to just send an acceptance email (i.e. no contract signing) which doesn't legally bind me to join that company. So, legally I am not doing anything wrong. However, I am worried that if I am doing right/wrong ethically.]

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• Informing GUI objects about screen size - Designing

  - by Mosquito

  I have a problem with designing classes for my game which I create. In my app, there is: class CGame which contains all the information about game itself, e.g. screen width, screen height, etc. In the main() function I create a pointer to CGame instance. class CGUIObject which includes fields specifying it's position and draw() method, which should know how to draw an object according to screen size. class CGUIManager which is a singleton and it includes a list of CGUIObject's. For each object in a list it just calls draw() method. For clarity's sake, I'll put some simple code: class CGame { int screenWidth; int screenHeight; }; class CGUIObject { CPoint position; void draw(); // this one needs to know what is a screen's width and height }; class CGUIManager // it's a singleton { vector<CGUIObject*> guiObjects; void drawObjects(); }; And the main.cpp: CGame* g; int main() { g = new CGame(); while(1) { CGUIManager::Instance().drawObjects(); } return 0; } Now the problem is, that each CGUIObject needs to know the screen size which is held by CGame, but I find it very dumb to include pointer to CGame instance in every object. Could anyone, please, tell me what would be the best approach to achieve this?

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• Allowing client to select data to return via REST interface

  - by CMP

  I have a rest service that is essentially a proxy to a variety of other services. So if I call GET /users/{id} It will get their user profile, as well as order history, and contact info, etc... all from various services, and aggregates them into one nice object. My problem is that each call to a different service has the potential to add time to the original request, so we would rather not get ALL the data ALL of the time if a particular client does not care about all of the pieces. A solution I have arrived at is to do something like this: GET /users/{id}?includeOrders=true&includeX=true&includeY=true... That works, and it allow me to do only what I need to, but it is cumbersome. We have added enough different data sources that there are too many parameters for that style to be useful. I could do something similar with a single integer and a bitmask or something, but that only makes it harder to read, and it does not feel very Restful. I could break it down into multiple calls so they would need to call /users/{id}/orders and /users/{id}/profile separately, but that sort of defeats the purpose of an aggregating proxy, who's purpose is to make clients jobs easier. Are there any good patterns that can help me return just enough data for each client, without making it too difficult for them to filter and select what they want?

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• State Changes in a Component Based Architecture [closed]

  - by Maxem

  I'm currently working on a game and using the naive component based architecture thingie (Entities are a bag of components, entity.Update() calls Update on each updateable component), while the addition of new features is really simple, it makes a few things really difficult: a) multithreading / currency b) networking c) unit testing. Multithreading / Concurrency is difficult because I basically have to do poor mans concurrency (running the entity updates in separate threads while locking only stuff that crashes (like lists) and ignoring the staleness of read state (some states are already updated, others aren't)) Networking: There are no explicit state changes that I could efficiently push over the net. Unit testing: All updates may or may not conflict, so automated testing is at least awkward. I was thinking about these issues a bit and would like your input on these changes / idea: Switch from the naive cba to a cba with sub systems that work on lists of components Make all state changes explicit Combine 1 and 2 :p Example world update: statePostProcessing.Wait() // ensure that post processing has finished Apply(postProcessedState) state = new StateBag() Concurrently( () => LifeCycleSubSystem.Update(state), // populates the state bag () => MovementSubSystem.Update(state), // populates the state bag .... }) statePostProcessing = Future(() => PostProcess(state)) statePostProcessing.Start() // Tick is finished, the post processing happens in the background So basically the changes are (consistently) based on the data for the last tick; the post processing can a) generate network packages and b) fix conflicts / remove useless changes (example: entity has been destroyed - ignore movement etc.). EDIT: To clarify the granularity of the state changes: If I save these post processed state bags and apply them to an empty world, I see exactly what has happened in the game these state bags originated from - "Free" replay capability. EDIT2: I guess I should have used the term Event instead of State Change and point out that I kind of want to use the Event Sourcing pattern

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• What online games would let me practice AI development?

  - by Myn

  I am working on a project experimenting with Artificial Intelligence design methodologies for online world avatars. Online world here is quite open to interpretation; Second Life is just as applicable as Counter Strike, for example. To carry out these experiments, I must first develop an intelligent agent for the world in question. However, I am honestly quite stuck as to which game I could use for this. My preference was to develop an intelligent "bot" to play an MMORPG, but the legal restrictions of such games prevent me. Likewise with most FPS games the use of an intelligent agent in place of a human player is considered cheating. The alternative, of course, is to create an NPC bot; an intelligent agent that populates the world alongside the player(s) rather than replacing a particular player. However, I'm struggling to find a game that would enable me to create an intelligent opponent either. I suppose the main requirements would be a game allows a third party program to use the function calls usually utilised by players and read feedback on the state of the world. Quake III and Unreal Tournament have been suggested before, but they have already been the subject of work on this research project. Short of writing my own online game from scratch, what games would allow me, through middleware, an API, or otherwise, to create either an artificially intelligent player or a bot?

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• MVVM and service pattern

  - by alfa-alfa

  I'm building a WPF application using the MVVM pattern. Right now, my viewmodels calls the service layer to retrieve models (how is not relevant to the viewmodel) and convert them to viewmodels. I'm using constructor injection to pass the service required to the viewmodel. It's easily testable and works well for viewmodels with few dependencies, but as soon as I try to create viewModels for complex models, I have a constructor with a LOT of services injected in it (one to retrieve each dependencies and a list of all available values to bind to an itemsSource for example). I'm wondering how to handle multiple services like that and still have a viewmodel that I can unit test easily. I'm thinking of a few solutions: Creating a services singleton (IServices) containing all the available services as interfaces. Example: Services.Current.XXXService.Retrieve(), Services.Current.YYYService.Retrieve(). That way, I don't have a huge constructor with a ton of services parameters in them. Creating a facade for the services used by the viewModel and passing this object in the ctor of my viewmodel. But then, I'll have to create a facade for each of my complexe viewmodels, and it might be a bit much... What do you think is the "right" way to implement this kind of architecture ?

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• Need to include Calendar and Email in own CRM system. Whose?

  - by PurplePilot

  I am writing a web based application that needs to have some elements of CRM in it but I cannot use an of-the-shelf CRM to do what I want. (Honestly we have been through it all and it will not work). Now while Tasks, Calls, Meetings and Notes are straightforward the idea of reinventing Mail and Calendars seems a waste of time and effort and also unproductive as most users already have their own and it simply adds to the complexity of my application and hacks users off. My thoughts are going around using Outlook and or GMail/iCal and or Mac Mail/iCal and or Thunderbird and importing the relevant data or if possible integrating it into the application. Any thoughts? Anyone got any experience of this can point me in a few directions. N.B. Not looking for an answer as too complex just some pointers and thoughts. Thanks. p.s. We did look at Sugar CRM as the basis for our project and it is useful to get best practice from but as I say it was not useable due to how we are structuring our software, not Sugar's fault.

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• Using the Coherence ConcurrentMap Interface (Locking API)

  - by jpurdy

  For many developers using Coherence, the first place they look for concurrency control is the com.tangosol.util.ConcurrentMap interface (part of the NamedCache interface). The ConcurrentMap interface includes methods for explicitly locking data. Despite the obvious appeal of a lock-based API, these methods should generally be avoided for a variety of reasons: They are very "chatty" in that they can't be bundled with other operations (such as get and put) and there are no collection-based versions of them. Locks do directly not impact mutating calls (including puts and entry processors), so all code must make explicit lock requests before modifying (or in some cases reading) cache entries. They require coordination of all code that may mutate the objects, including the need to lock at the same level of granularity (there is no built-in lock hierarchy and thus no concept of lock escalation). Even if all code is properly coordinated (or there's only one piece of code), failure during updates that may leave a collection of changes to a set of objects in a partially committed state. There is no concept of a read-only lock. In general, use of locking is highly discouraged for most applications. Instead, the use of entry processors provides a far more efficient approach, at the cost of some additional complexity.

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• Many user stories share the same technical tasks: what to do?

  - by d3prok

  A little introduction to my case: As part of a bigger product, my team is asked to realize a small IDE for a DSL. The user of this product will be able to make function calls in the code and we are also asked to provide some useful function libraries. The team, together with the PO, put on the wall a certain number of user stories regarding the various libraries for the IDE user. When estimating the first of those stories, the team decided that the function call mechanism would have been an engaging but not completely obvious task, so the estimate for that user story raised up from a simple 3 to a more dangerous 5. Coming to the problem: The team then moved to the user stories regarding the other libraries, actually 10 stories, and added those 2 points of "function call mechanism" thing to each of those user story. This immediately raised up the total points for the product of 20 points! Everyone in the team knows that each user story could be picked up by the PO for the next iteration at any time, so we shouldn't isolate that part in one user story, but those 20 points feel so awfully unrealistic! I've proposed a solution, but I'm absolutely not satisfied: We created a "Design story" and put those annoying 2 points over it. However when we came to realize and demonstrate it to our customers, we were unable to show something really valuable for them about that story! Here the problem is whether we should ignore the principle of having isolated user stories (without any dependency between them). What would you do, or even better what have you done, in situations like this? (a small foot-note: following a suggestion I've moved this question from stackoverflow)

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• Get Func-y

  - by PhubarBaz

  I was working on a Windows form app and needed a way to call out to a service without blocking the UI. There are a lot of ways to do this but I came up with one that I thought was pretty simple. It utilizes the System.Func<> generic class, which is basically a way to create delegates using generics. It's a lot more compact and simpler than creating delegates for each method you want to call asynchronously. I wanted to get it down to one line of code, but it was a lot simpler to use three lines.In this case I have a MyServiceCall method that takes an integer parameter and returns a ServiceCallResult object.public ServiceCallResult MyServiceCall(int param1)...You start by getting a Func<> object for the method you want to call, in this case MyServiceCall. Then you call BeginInvoke() on the Func passing in the parameter. The two nulls are parameters BeginInvoke expects but can be ignored here. BeginInvoke returns an IAsyncResult object that acts like a handle to the method call. Finally to get the value you call EndInvoke on the Func passing in the IAsyncResult object you got back from BeginInvoke.Func<int, ServiceCallResult> f = MyServiceCall;IAsyncResult async = f.BeginInvoke(23, null, null);ServiceCallResult result = f.EndInvoke(async);Doing it this way fires off a new thread that calls the MyServiceCall() method. This leaves the main application thread free to update the UI while the method call is running so it doesn't become unresponsive.

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• Linux, GNU GCC, ld, version scripts and the ELF binary format -- How does it work? [closed]

  - by themoondothshine

  I'm trying to learn more about library versioning in Linux and how to put it all to work. Here's the context: I have two versions of a dynamic library which expose the same set of interfaces, say libsome1.so and libsome2.so. An application is linked against libsome1.so. This application uses libdl.so to dynamically load another module, say libmagic.so. Now libmagic.so is linked against libsome2.so. Obviously, without using linker scripts to hide symbols in libmagic.so, at run-time all calls to interfaces in libsome2.so are resolved to libsome1.so. This can be confirmed by checking the value returned by libVersion() against the value of the macro LIB_VERSION. So I try next to compile and link libmagic.so with a linker script which hides all symbols except 3 which are defined in libmagic.so and are exported by it. This works... Or at least libVersion() and LIB_VERSION values match (and it reports version 2 not 1). However, when some data structures are serialized to disk, I noticed some corruption. In the application's directory if I delete libsome1.so and create a soft link in its place to point to libsome2.so, everything works as expected and the same corruption does not happen. I can't help but think that this may be caused due to some conflict in the run-time linker's resolution of symbols. I've tried many things, like trying to link libsome2.so so that all symbols are alised to symbol@@VER_2 (which I am still confused about because the command nm -CD libsome2.so still lists symbols as symbol and not symbol@@VER_2), but nothing seems to work. What am I doing wrong?

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• Tomcat 7 vs. ehCache Standalone Server (Glassfish) Configuration with RESTful Web Services

  - by socal_javaguy

  My requirements consist of using ehCache to send and store data via RESTful web service calls. The data can be stored in-memory or via the filesystem... Never used ehCache before so I am having some issues deciding on which bundle to use. Have downloaded the following bundles: ehcache-2.6.2 ehcache-standalone-server-1.0.0 (1) What is the difference between the two? It seems the ehcache-2.6.2 contains src and binaries, which essentially enables one to bundle it with their webapps (by putting the compiled jar or binaries inside the webapp's WEB-INF/lib folder). But it doesn't seem that it has support for Restful web services. Whereas, ehcache-standalone-server-1.0.0 (comes with an embedded Glassfish server and has support for REST & SOAP) can be used to run as a standalone server. If I my answers to my own question are correct, then that means, I should just use the standalone server? (2) My requirements are to setup ehCache (with REST support) on Tomcat 7. So, how could I setup ehCache on Tomcat 7 as a separate app with REST & SOAP support? Thank you for taking the time to read this...

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• Tips for Making this Code Testable [migrated]

  - by Jesse Bunch

  So I'm writing an abstraction layer that wraps a telephony RESTful service for sending text messages and making phone calls. I should build this in such a way that the low-level provider, in this case Twilio, can be easily swapped without having to re-code the higher level interactions. I'm using a package that is pre-built for Twilio and so I'm thinking that I need to create a wrapper interface to standardize the interaction between the Twilio service package and my application. Let us pretend that I cannot modify this pre-built package. Here is what I have so far (in PHP): <?php namespace Telephony; class Provider_Twilio implements Provider_Interface { public function send_sms(Provider_Request_SMS $request) { if (!$request->is_valid()) throw new Provider_Exception_InvalidRequest(); $sms = \Twilio\Twilio::request('SmsMessage'); $response = $sms->create(array( 'To' => $request->to, 'From' => $request->from, 'Body' => $request->body )); if ($this->_did_request_fail($response)) { throw new Provider_Exception_RequestFailed($response->message); } $response = new Provider_Response_SMS(TRUE); return $response; } private function _did_request_fail($api_response) { return isset($api_response->status); } } So the idea is that I can write another file like this for any other telephony service provided that it implements Provider_Interface making them swappable. Here are my questions: First off, do you think this is a good design? How could it be improved? Second, I'm having a hard time testing this because I need to mock out the Twilio package so that I'm not actually depending on Twilio's API for my tests to pass or fail. Do you see any strategy for mocking this out? Thanks in advance for any advice!

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• Localization of Database Strings in .Net

  - by Aligned

  I have several database tables that have a description column that I need to display in the UI. .Net has .resx files that will help with the translation of the strings, when the Thread.CurrentCulture.UICulture is set, but I needed a custom approach for the strings that are stored in the database and not in the .resx files. Here’s my approach: 1. Create a resource file for each database table and put them in the /Resources/Database/ directory. 2. Create a method in LocalizationHelpers (GetLocalizedString) that will get the string from the table for English (which should be cached to avoid unneeded service/database calls) or the resx when not English. 3. All database tables need to have a ResxKey field that matches the key in the resx file. 4. By convention the resx file will have the same name as the database table, and the key the same as the database ResxKey.   - if there are multiple columns that need translation, then one ResxKey will be used and Name or Description appended. Here’s the method I’m using to pull the string: public static string GetLocalizedString(string resourceName, string resourceKey) { if (executingAssembly == null) { executingAssembly = Assembly.GetExecutingAssembly(); } ResourceManager manager = new ResourceManager(resourceName, executingAssembly); return manager.GetString(resourceKey); }

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• Sprite batching seems slow

  - by Dekowta

  I have implemented a sprite batching system in OpenGL which will batch sprites based on their texture. How ever when I'm rendering ~5000 sprites all using the same texture i'm getting roughly 30fps. The process is as followed create sprite batch which also create a VBO with a set size and also creates the shaders as well call begin and initialise the render mode (at the moment just setting alpha on) call Draw with a sprite. This checks to see if the texture of the sprite has already been loaded and if so it just creates a pointer to the batch item and adds the new sprite coords. If not then it creates a new batch item and adds the sprite coords to that; it adds the batch item to the main batch. if the max sprite count is reached render will be called call end which calls render to render the left over sprites in the batch. and also resets the buffer offset render loops through each item in the batch and will bind the texture of the batch item, map the data to the buffer and then draw the array. the buffer will then be offset by the amount of sprites drawn. I have a feeling that it could be the method i'm using to store the batched sprites or it could be something else that i'm missing but I still can work it out. the cpp and h files are as followed http://pastebin.com/ZAytErGB http://pastebin.com/iCB608tA On top of this i'm also getting a weird issue where then two sprites are batched on after the other the second sprite will use the same coordinates as the last. And then when one if drawn after it is fine. I can't seem to find what is causing this issue. any help would be appreciated iv been sat trying to work this all out for a while now and cant seems to put my finger on what's causing it all.

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• Trying to implement pre/post method code: better to use methods or a parent class?

  - by Will

  I'm finding it difficult to frame this question so ... I want to execute code both before and after a method runs in PHP. There are, as far as I know, two ways to implement this: Method One: pre and post methods class Model { function find($id) { $this->_precode(); // ... do stuff $this->post_code(); } } Add the calls to _precode() and _postcode() to each method where I need this functionality. Method Two: __call and method naming class Model extends PrePost { function prepost_find($id) { // ... do stuff ... } } class PrePost { function __call($method,$param) { $method = "prepost_$method"; // .. precode here .. $result = $this->$method($param); // .. postcode here .. } } This relies on naming a method in a specific way in the inheriting class. Is there a preferred way of doing this? The call method can be made to only handle its specific cases and even defer to a child class's call if there is one. I'm not looking for opinions; I'm looking to find out if there are valid reasons to choose one way over another.

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• C# calendar needs Business Logic for real-time reminders? [on hold]

  - by lazfish

  I am not a super experienced C# user, though I have some experience in .Net and VB.Net. Just got this new job and my first assignment is a mission critical part of the business. It is pretty important I get it right so I was hoping for some sage advice. We have created a calendar using jQuery, C#, .Net & SQL Server 08. The calendar works but now we are wanting to add email, SMS and voice-call reminders. We are a small company and can do whatever we need to do with no restrictions on our IT environment. I have some base-line experience with Unix servers but would prefer to stay in the Micro$oft universe if it is prudent to do so. I know how to add the API calls and services to initiate these reminders (using built in email services for email and Twilio.com for SMS). I am asking for advice about how to approach a reliable and timely listener service that knows when to call the service or API for the reminder before an appointment. EG. SMS: "You have a conference call in 30 minutes." I have done some research, but it is hard to know what is a proven reliable approach. What I am looking for is an experienced opinion on a good (or the best) strategy for implementing a solution that will reliably listen for appointments and dispatch the reminders when needed.

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• c++ accumulate with move instead of copy [migrated]

  - by user74399

  I have the following code auto adder = [](string& s1, const string& s2)->string&& { if (!s1.empty()) s1 += " "; s1 += s2; return move(s1); }; string test; test.reserve(wordArray.size() * 10); string words = accumulate(wordArray.begin(), wordArray.end(), move(test), adder); What I would like here is to avoid string copying. Unfortunately this is not accomplished by the vs2012 implementation of accumulate. Internally accumulate calls another function _Accumulate and the rvalue functionality gets lost in the process. It I instead call the _Accumulate function like so string words = Accumulate(wordArray.begin(), wordArray.end(), move(test), adder); I get the intended performance gain. Must the std library be rewritten to take rvalue arguments into consideration? Is there some other way I may use accumulate to accomplish what I want without cheating to much?

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• Does the ulkJSON library have limitations when dealing with base64 in Delphi 7?

  - by Da Gopherboy

  I'm working on a project that is using Delphi 7 to consume RESTful services. We are creating and decoding JSON with the ulkJSON library. Up to this point I've been able to successfully build and send JSON containing a base64 string that exceed 5,160kb. I can verify that the base64 is being received by the services and verify the integrity of the base64 once its there. In addition to sending, I can also receive and successfully decode JSON with a smaller (~ 256KB or less) base64. However I am experiencing some issues on the return trip when larger (~1,024KB+) base64 is involved for some reason. Specifically when attempting to use the following JSON format and function combination: JSON: { "message" : "/9j/4AAQSkZJRgABAQEAYABgAAD...." } Function: function checkResults(JSONFormattedString: String): String; var jsonObject : TlkJSONObject; iteration : Integer; i : Integer; x : Integer; begin jsonObject := TlkJSONobject.Create; // Validate that the JSONFormatted string is not empty. // If it is empty, inform the user/programmer, and exit from this routine. if JSONFormattedString = '' then begin result := 'Error: JSON returned is Null'; jsonObject.Free; exit; end; // Now that we can validate that this string is not empty, we are going to // assume that the string is a JSONFormatted string and attempt to parse it. // // If the string is not a valid JSON object (such as an http status code) // throw an exception informing the user/programmer that an unexpected value // has been passed. And exit from this routine. try jsonObject := TlkJSON.ParseText(JSONFormattedString) as TlkJSONobject; except on e:Exception do begin result := 'Error: No JSON was received from web services'; jsonObject.Free; exit; end; end; // Now that the object has been parsed, lets check the contents. try result := jsonObject.Field['message'].value; jsonObject.Free; exit; except on e:Exception do begin result := 'Error: No Message received from Web Services '+e.message; jsonObject.Free; exit; end; end; end; As mentioned above when using the above function, I am able to get small (256KB and less) base64 strings out of the 'message' field of a JSON object. But for some reason if the received JSON is larger than say 1,024kb the following line seems to just stop in its tracks: jsonObject := TlkJSON.ParseText(JSONFormattedString) as TlkJSONobject; No errors, no results. Following the debugger, I can go into the library, and see that the JSON string being passed is not considered to be JSON despite being in the format listed above. The only difference I can find between calls that work as expected and calls that do not work as expect appears to be the size of base64 being transmitted. Am I missing something completely obvious and should be shot for my code implementation (very possible)? Have I missed some notation regarding the limitations of the ulkJSON library? Any input would be extremely helpful. Thanks in advance stack!

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