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• RESTful Http DELETE method in .NET

  - by VIBA

  I am new to web services. I am dealing with testing APIs in my project. In the previous version the company used GET and POST methods but not PUT and DELETE methods. I need help for the HTTP DELETE method. I have browsed various websites where I found the example code snippets for GET and POST methods, but not for DELETE and PUT methods (why?). Can anyone give me an example code snippet (C#) for RESTful HTTP DELETE method and explain how to call the DELETE request?

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• Enterprise Architecture - Wikipedia

  - by pat.shepherd

  I was looking at the Wikipedia entry for EA and found this chart which does a great job showing the differences of ENTERPRISE Architecture vs. SOLUTION Architecture across several categories.  This really gets at the heart of a misconception many people have about what EA is and where it sits in the grand business –> technical detail continuum. The following image from the 2006 FEA Practice Guidance of US OMB sheds light on the relationship between enterprise architecture and segment(BPR) or Solution architectures. (From this figure and a bit of thinking[which?] one can see that software architecture is truly a solution architecture discipline, for example.) Enterprise architecture - Wikipedia, the free encyclopedia

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• curl POST to RESTful services

  - by Sashikiran Challa

  Hello All, There are a lot of questions on Stackoverflow about curl but I could not figure out what is that I am doing what I am not supposed to. I am trying to call a RESTful service that I had written using Jersey API and am trying to POST an xml string to it and I get HTTP 415 error which is supposed to be a Media Type error. Here in my shell script call to 1st service: abc=curl http://gf...:8080/InChItoD/inchi/3dstructure?InChIstring=$inchi echo $abc (this works fine the output that it returns is given below.) Posting this xml string to second service def= curl -d $abc -H "Content-Type:text/xml" http://gf...:8080/XML2G/xml3d/gssinput I get the following error: ... ... HTTP Status 415 Status report message description.The server refused this request because the request entity is in a format not supported by the requested resource for the requested method ().Apache Tomcat/6.0.26 This is a sample of xml string I am trying to POST <?xml version="1.0"?><molecule xmlns="http://www.xml-cml.org/schema"> <atomArray> <atom id="a1" elementType="N" formalCharge="1" x3="0.997963" y3="-0.002882" z3="-0.004222"/> <atom id="a2" elementType="H" x3="2.024650" y3="-0.002674" z3="0.004172"/> <atom id="a3" elementType="H" x3="0.655444" y3="0.964985" z3="0.004172"/> <atom id="a4" elementType="H" x3="0.649003" y3="-0.496650" z3="0.825505"/> <atom id="a5" elementType="H" x3="0.662767" y3="-0.477173" z3="-0.850949"/> </atomArray> <bondArray> <bond atomRefs2="a1 a2" order="1"/> <bond atomRefs2="a1 a3" order="1"/> <bond atomRefs2="a1 a4" order="1"/> <bond atomRefs2="a1 a5" order="1"/> </bondArray></molecule> Thanks in advance

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• EclEmma JAVA Code coverage - Unable to coverage service layer of RESTful Webservice

  - by Radhika

  I am using EMMA eclipse plugin to generate code coverage reports. My application is a RESTFul webservice. Junits are written such that a client is created for the webservice and invoked with various inputs. However EMMA shows 0% coverage for the source folder. The test folder alone is covered. The application server(jetty server) is started using a main method. Report: Element Coverage Covered Instructions Total Instructions MyRestFulService 13.6% 900 11846 src 0.5% 49 10412 test 98% 1021 1434 Junit Test method: @Test public final void testAddFlow() throws Exception { Client c = Client.create(); WebResource webResource = c.resource(BASE_URI); // Sample files for Add String xhtmlDocument = null; Iterator iter = mapOfAddFiles.entrySet().iterator(); while (iter.hasNext()) { Map.Entry pairs = (Map.Entry) iter.next(); try { document = helper.readFile(requestPath + pairs.getKey()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } /* POST */ MultiPart multiPart = new MultiPart(); multiPart.bodyPart(.... ........... ClientResponse response = webResource.path("/add").type( MEDIATYPE_MULTIPART_MIXED).post(ClientResponse.class, multiPart); assertEquals("TESTING ADD FOR >>>>>>> " + pairs.getKey(), Status.OK, response.getClientResponseStatus()); } } } Invoked service method: @POST @Path("add") @Consumes("multipart/mixed") public Response add(MultiPart multiPart) throws Exception { Status status = null; List<BodyPart> bodyParts = null; bodyParts = multiPart.getBodyParts(); status = //call to business layer return Response.ok(status).build(); }

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• Extjs to call a RESTful webservice

  - by VSC

  Hello, I am trying to make a RESTful webservice call using Extjs. Below is the code i am using: Ext.Ajax.request({ url: incomingURL , method: 'POST', params: {param1:p1, param2:p2}, success: function(responseObject){ var obj = Ext.decode(responseObject.responseText); alert(obj); }, failure: function(responseObject){ var obj = Ext.decode(responseObject.responseText); alert(obj); } }); but it does not work, the request is sent using OPTIONS method instead of POST. I also tried to do the same thing using below code but result is the same: var conn = new Ext.data.Connection(); conn.request({ url: incomingURL, method: 'POST', params: {param1:p1, param2:p2}, success: function(responseObject) { Ext.Msg.alert('Status', 'success'); }, failure: function(responseObject) { Ext.Msg.alert('Status', 'Failure'); } }); But when i tried to do the same thing using basic ajax call ( using the browser objects directly i.e. XMLHttpRequest() or ActiveXObject("Microsoft.XMLHTTP")) it works fine and i get the response as expected. Can anyone please help me, as i am not able to understand what i am doing wrong with extjs ajax call?

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• Forms authentication, ASP.NET MVC and WCF RESTful service

  - by J F

  One test webserver, with the following applications service.ganymedes.com:8008 - WCF RESTful service, basically the FormsAuth sample from WCF Starter Kit Preview 2 mvc.ganymedes.com:8008 - ASP.NET MVC 2.0 application web.config for service.ganymedes.com: <authentication mode="Forms"> <forms loginUrl="~/login.aspx" timeout="2880" domain="ganymedes.com" name="GANYMEDES_COOKIE" path="/" /> </authentication> web.config for mvc.ganymedes.com: <authentication mode="Forms"> <forms loginUrl="~/Account/LogOn" timeout="2880" domain="ganymedes.com" name="GANYMEDES_COOKIE" path="/" /> </authentication> Trying my darndest, a GET (or POST for that matter) via jQuery's $.ajax or getJson does not send my cookie (according to Firebug), so I get HTTP 302 returned from the WCF service: Request Headers Host service.ganymedes.com:8008 User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729) Accept application/json, text/javascript, */* Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 300 Connection keep-alive Referer http://mvc.ganymedes.com:8008/Test Origin http://mvc.ganymedes.com:8008 It's sent when mucking about on the MVC site though: Request Headers Host mvc.ganymedes.com:8008 User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729) Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 300 Connection keep-alive Referer http://mvc.ganymedes.com:8008/Test Cookie GANYMEDES_COOKIE=0106A4A666C8C615FBFA9811E9A6C5219C277D625C04E54122D881A601CD0E00C10AF481CB21FAED544FAF4E9B50C59CDE2385644BBF01DDD4F211FE7EE8FAC2; GANYMEDES_COOKIE=D6569887B7C5B67EFE09079DD59A07A98311D7879817C382D79947AE62B5508008C2B2D2112DCFCE5B8D4C61D45A109E61BBA637FD30315C2D8353E8DDFD4309 I also put the exact same settings in both applications' web.config files (self-generated validationKey and decryptionKey).

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• RESTful idempotence

  - by DutrowLLC

  I'm designing a RESTful web service utilizing ROA(Resource oriented architecture). I'm trying to work out an efficient way to guarantee idempotence for PUT requests that create new resources in cases that the server designates the resource key. From my understanding, the traditional approach is to create a type of transaction resource such as /CREATE_PERSON. The the client-server interaction for creating a new person resource would be in two parts: Step 1: Get unique transaction id for creating the new PERSON resource::: **Client request:** GET /CREATE_PERSON **Server response:** 200 OK transaction-id:"as8yfasiob" Step 2: Create the new person resource in a request guaranteed to be unique by using the transaction id::: **Client request** PUT /CREATE_PERSON/{transaction_id} first_name="Big bubba" **Server response** 201 Created // (If the request is a duplicate, it would send this PersonKey="398u4nsdf" // same response without creating a new resource. It // would perhaps send an error response if the was used // on a transaction id non-duplicate request, but I have // control over the client, so I can guarantee that this // won't happen) The problem that I see with this approach is that it requires sending two requests to the server in order to do to single operation of creating a new PERSON resource. This creates a performance issues increasing the chance that the user will be waiting around for the client to complete their request. I've been trying to hash out ideas for eliminating the first step such as pre-sending transaction-id's with each request, but most of my ideas have other issues or involve sacrificing the statelessness of the application. Is there a way to do this?

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• Unable to call RESTful web services methods

  - by Alessandro

  Hello, I'm trying to dive into the RESTful web services world and have started with the following template: [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class Test { // TODO: Implement the collection resource that will contain the SampleItem instances [WebGet(UriTemplate = ""), OperationContract] public List<SampleItem> GetCollection() { // TODO: Replace the current implementation to return a collection of SampleItem instances return new List<SampleItem>() {new SampleItem() {Id = 1, StringValue = "Hello"}}; } [WebInvoke(UriTemplate = "", Method = "POST"), OperationContract] public SampleItem Create(SampleItem instance) { // TODO: Add the new instance of SampleItem to the collection throw new NotImplementedException(); } [WebGet(UriTemplate = "{id}"), OperationContract] public SampleItem Get(string id) { // TODO: Return the instance of SampleItem with the given id throw new NotImplementedException(); } [WebInvoke(UriTemplate = "{id}", Method = "PUT"), OperationContract] public SampleItem Update(string id, SampleItem instance) { return new SampleItem { Id = 99, StringValue = "Done" }; } [WebInvoke(UriTemplate = "{id}", Method = "DELETE"), OperationContract] public void Delete(string id) { // TODO: Remove the instance of SampleItem with the given id from the collection throw new NotImplementedException(); } } I am able to perform the GET operation but I am unable to perform PUT, POST or DELETE requests. Can anyone explain me how to perform these operations and how to create the correct URLs? Best regards Alessandro

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• want an example of detailed n-tier Architecture diagram?

  - by Azhar

  want an example of detailed n-tier Architecture diagram?

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• RESTful copy/move operations?

  - by ladenedge

  I am trying to design a RESTful filesystem-like service, and copy/move operations are causing me some trouble. First of all, uploading a new file is done using a PUT to the file's ultimate URL: PUT /folders/42/contents/<name> The question is, what if the new file already resides on the system under a different URL? Copy/move Idea 1: PUTs with custom headers. This is similar to S3's copy. A PUT that looks the same as the upload, but with a custom header: PUT /folders/42/contents/<name> X-custom-source: /files/5 This is nice because it's easy to change the file's name at copy/move time. However, S3 doesn't offer a move operation, perhaps because a move using this scheme won't be idempotent. Copy/move Idea 2: POST to parent folder. This is similar to the Google Docs copy. A POST to the destination folder with XML content describing the source file: POST /folders/42/contents ... <source>/files/5</source> <newName>foo</newName> I might be able to POST to the file's new URL to change its name..? Otherwise I'm stuck with specifying a new name in the XML content, which amplifies the RPCness of this idea. It's also not as consistent with the upload operation as idea 1. Ultimately I'm looking for something that's easy to use and understand, so in addition to criticism of the above, new ideas are certainly welcome!

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• Tellago releases a RESTful API for BizTalk Server business rules

  - by Charles Young

  Jesus Rodriguez has blogged recently on Tellago Devlabs' release of an open source RESTful API for BizTalk Server Business Rules.   This is an excellent addition to the BizTalk ecosystem and I congratulate Tellago on their work.   See http://weblogs.asp.net/gsusx/archive/2011/02/08/tellago-devlabs-a-restful-api-for-biztalk-server-business-rules.aspx   The Microsoft BRE was originally designed to be used as an embedded library in .NET applications. This is reflected in the implementation of the Rules Engine Update (REU) Service which is a TCP/IP service that is hosted by a Windows service running locally on each BizTalk box. The job of the REU is to distribute rules, managed and held in a central database repository, across the various servers in a BizTalk group.   The engine is therefore distributed on each box, rather than exploited behind a central rules service.   This model is all very well, but proves quite restrictive in enterprise environments. The problem is that the BRE can only run legally on licensed BizTalk boxes. Increasingly we need to deliver rules capabilities across a more widely distributed environment. For example, in the project I am working on currently, we need to surface decisioning capabilities for use within WF workflow services running under AppFabric on non-BTS boxes. The BRE does not, currently, offer any centralised rule service facilities out of the box, and hence you have to roll your own (and then run your rules services on BTS boxes which has raised a few eyebrows on my current project, as all other WCF services run on a dedicated server farm ).   Tellago's API addresses this by providing a RESTful API for querying the rules repository and executing rule sets against XML passed in the request payload. As Jesus points out in his post, using a RESTful approach hugely increases the reach of BRE-based decisioning, allowing simple invocation from code written in dynamic languages, mobile devices, etc.   We developed our own SOAP-based general-purpose rules service to handle scenarios such as the one we face on my current project. SOAP is arguably better suited to enterprise service bus environments (please don't 'flame' me - I refuse to engage in the RESTFul vs. SOAP war). For example, on my current project we use claims based authorisation across the entire service bus and use WIF and WS-Federation for this purpose.   We have extended this to the rules service. I can't release the code for commercial reasons :-( but this approach allows us to legally extend the reach of BRE far beyond the confines of the BizTalk boxes on which it runs and to provide general purpose decisioning capabilities on the bus.   So, well done Tellago.   I haven't had a chance to play with the API yet, but am looking forward to doing so.

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• Are There Any Examples of Uncle Bob's High-Falutin' Architecture?

  - by Jordan

  I just finished watching this presentation by Uncle Bob (as well as his "Architecture" section of his "Clean Code" videos), but I'm left wondering: Are there any examples out there of applications that implement this Entity-Boundary-Interactor (or Entity-Boundary-Controller) structure? At one point I downloaded the source code to FitNesse (the acceptance testing project he mentions often as an example of not only high test coverage but good architecture, since they were able to defer the decision to not use a database until the very end), and based on a quick glance of it it appears even this project doesn't seem to fit this pattern. Are there any nontrivial examples of this architecture out in the wild, or should I not bother even looking into it and chalk it up as "it would be great if you could get there, but nobody really does"?

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• What are some high quality Enterprise Architecture conferences or training programs?

  - by Stimy

  I am looking for a conference or training which will give me a broad exposure to enterprise level software architecture. I've been with the same company for 10 years and we've grown to the size where we really need to lay out a framework for the applications which support our company's business. The organic growth over the last 10 years has left us with a tightly coupled and fairly messy set of applications. We need to do a better job at componentizing our business entities and have more rigorous control on the interfaces between those entities and our business processes. I'm looking to get a broad, yet practical exposure on design patterns to support that architecture (SOA, messaging, ESB's etc). I'm hoping to gain insight from folks who have direct experience with implementing or working with what would be considered an enterprise class architecture.

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• OO Software Architecture - base class that everything inherits from. Bad/good idea?

  - by ale

  I am reviewing a proposed OO software architecture that looks like this: Base Foo Something Bar SomethingElse Where Base is a static class. My immediate thought was that every object in any class will inherit all the methods in Base which would create a large object. Could this cause problems for a large system? The whole architecture is hierarchical.. the 'tree' is much bigger than this really. Does this sort of architecture have a name (hierarchical?!). What are the known pros and cons?

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• Single database, multiple system dependency

  - by davenewza

  Consider an environment where we have a single, core database, with many separate systems using this one database. This leads to all of these systems have a common dependency, which ultimately introduces coupling between them. This means that we cannot always evolve systems independently of each other. Structural changes to the database (even if only intended for one, particular system), requires a full sweep test of ALL systems, and may require that other systems be 'patched' and subsequently released. This is especially tricky when you want to have separate teams working on different projects. What is a good 'pattern' to help in avoiding such coupling? I would imagine that a database should be exclusively depended on by one system. If other systems require data for whatever reason, they should request such from an API service of some kind. A drawback of this approach which comes to mind is performance: routing data between high-throughput systems through service calls is much slower than through a database connection.

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• Principles of an extensible data proxy

  - by Wesley

  There is a growing industry now with more than 30 companies playing in the Backend-As-A-Service (BaaS) market. The principle is simple: give companies a secure way of exposing data housed on premises and behind the firewall publicly. This can include database data, as well as Legacy PC data through established connectors; SAP for example provides a connector for transacting with their legacy systems. Early attempts were fixed providers for specific systems like SAP, IBM or Oracle, but the new breed is extensible, allowing Channel Partners and Consultants to build robust integration applications that can consume whatever data sources the client wants to expose. I just happen to be close to finishing a Cloud Based HTML5 application platform that provides robust integration services, and I would like to break ground on an extensible data proxy to complete the system. From what I can gather, I need to provide either an installable web service of some kind, or a Cloud service which the client can configure with VPN for interactions. Then I can build in connectors, which can be activated with a service account, and expose those transactions via web services of some kind (JSON, SOAP, etc). I can also provide a framework that allows people to build in their own connectors, and use some kind of schema to hook those connectors into the proxy. The end result is some kind of public facing web service that could securely be consumed by applications to show data through HTML5 on any device. My gut is, this isn't as hard as it sounds. Almost all of the 30+ companies (With more popping up almost weekly) have all come into existence in the last 18 months or so, which tells me either the root technology, or the skillset to create the technology is in abundance right now. Where should I start on this? Are there some open source projects I can leverage? A specific group of developers I can hire? I'm confident someone here can set me on the right path and save me some time. You don't see this many companies spring up this rapidly if they are all starting from scratch with proprietary technology. The Register: WTF is BaaS One Minute Video from Kony on their BaaS

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• The Enterprise Architect (EA) diary - day 22 (from business processes to implemented applications)

  - by nattYGUR

  After spending time on keeping our repository up to date (add new ETRM application and related data flows as well as changing databases to DB clusters), collecting more data for the root cause analysis and spending time for writing proposal to creating new software infrastructure team ( that will help us to clean the table from a pile of problems that just keep on growing due to BAU control over IT dev team resources). I spend time to adapt our EA tool to support a diagram flow from high level business processes to implementation of new applications that will better support the business process. http://www.theeagroup.net/ea/Default.aspx?tabid=1&newsType=ArticleView&articleId=195

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• Should I cache the data or hit the database?

  - by JD01

  I have not worked with any caching mechanisms and was wondering what my options are in the .net world for the following scenario. We basically have a a REST Service where the user passes an ID of a Category (think folder) and this category may have lots of sub categories and each of the sub categories could have 1000 of media containers (think file reference objects) which contain information about a file that may be on a NAS or SAN server (files are videos in this case). The relationship between these categories is stored in a database together with some permission rules and meta data about the sub categories. So from a UI perspective we have a lazy loaded tree control which is driven by the user by clicking on each sub folder (think of Windows explorer). Once they come to a URL of the video file, they then can watch the video. The number of users could grow into the 1000s and the sub categories and videos could be in the 10000s as the system grows. The question is should we carry on the way it is currently working where each request hits the database or should we think about caching the data? We are on using IIS 6/7 and Asp.net.

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• Data Transformation Pipeline

  - by davenewza

  I have create some kind of data pipeline to transform coordinate data into more useful information. Here is the shell of pipeline: public class PositionPipeline { protected List<IPipelineComponent> components; public PositionPipeline() { components = new List<IPipelineComponent>(); } public PositionPipelineEntity Process(Position position) { foreach (var component in components) { position = component.Execute(position); } return position; } public PositionPipeline RegisterComponent(IPipelineComponent component) { components.Add(component); return this; } } Every IPipelineComponent accepts and returns the same type - a PositionPipelineEntity. Code: public interface IPipelineComponent { PositionPipelineEntity Execute(PositionPipelineEntity position); } The PositionPipelineEntity needs to have many properties, many which are unused in certain components and required in others. Some properties will also have become redundant at the end of the pipeline. For example, these components could be executed: TransformCoordinatesComponent: Parse the raw coordinate data into a Coordinate type. DetermineCountryComponent: Determine and stores country code. DetermineOnRoadComponent: Determine and store whether coordinate is on a road. Code: pipeline .RegisterComponent(new TransformCoordinatesComponent()) .RegisterComponent(new DetermineCountryComponent()) .RegisterComponent(new DetermineOnRoadComponent()); pipeline.Process(positionPipelineEntity); The PositionPipelineEntity type: public class PositionPipelineEntity { // Only relevant to the TransformCoordinatesComponent public decimal RawCoordinateLatitude { get; set; } // Only relevant to the TransformCoordinatesComponent public decimal RawCoordinateLongitude { get; set; } // Required by all components after TransformCoordinatesComponent public Coordinate CoordinateLatitude { get; set; } // Required by all components after TransformCoordinatesComponent public Coordinate CoordinateLongitude { get; set; } // Set in DetermineCountryComponent, not required anywhere. // Requires CoordinateLatitude and CoordinateLongitude (TransformCoordinatesComponent) public string CountryCode { get; set; } // Set in DetermineOnRoadComponent, not required anywhere. // Requires CoordinateLatitude and CoordinateLongitude (TransformCoordinatesComponent) public bool OnRoad { get; set; } } Problems: I'm very concerned about the dependency that a component has on properties. The way to solve this would be to create specific types for each component. The problem then is that I cannot chain them together like this. The other problem is the order of components in the pipeline matters. There is some dependency. The current structure does not provide any static or runtime checking for such a thing. Any feedback would be appreciated.

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• How granular should a command be in a CQ[R]S model?

  - by Aaronaught

  I'm considering a project to migrate part of our WCF-based SOA over to a service bus model (probably nServiceBus) and using some basic pub-sub to achieve Command-Query Separation. I'm not new to SOA, or even to service bus models, but I confess that until recently my concept of "separation" was limited to run-of-the-mill database mirroring and replication. Still, I'm attracted to the idea because it seems to provide all the benefits of an eventually-consistent system while sidestepping many of the obvious drawbacks (most notably the lack of proper transactional support). I've read a lot on the subject from Udi Dahan who is basically the guru on ESB architectures (at least in the Microsoft world), but one thing he says really puzzles me: As we get larger entities with more fields on them, we also get more actors working with those same entities, and the higher the likelihood that something will touch some attribute of them at any given time, increasing the number of concurrency conflicts. [...] A core element of CQRS is rethinking the design of the user interface to enable us to capture our users’ intent such that making a customer preferred is a different unit of work for the user than indicating that the customer has moved or that they’ve gotten married. Using an Excel-like UI for data changes doesn’t capture intent, as we saw above. -- Udi Dahan, Clarified CQRS From the perspective described in the quotation, it's hard to argue with that logic. But it seems to go against the grain with respect to SOAs. An SOA (and really services in general) are supposed to deal with coarse-grained messages so as to minimize network chatter - among many other benefits. I realize that network chatter is less of an issue when you've got highly-distributed systems with good message queuing and none of the baggage of RPC, but it doesn't seem wise to dismiss the issue entirely. Udi almost seems to be saying that every attribute change (i.e. field update) ought to be its own command, which is hard to imagine in the context of one user potentially updating hundreds or thousands of combined entities and attributes as it often is with a traditional web service. One batch update in SQL Server may take a fraction of a second given a good highly-parameterized query, table-valued parameter or bulk insert to a staging table; processing all of these updates one at a time is slow, slow, slow, and OLTP database hardware is the most expensive of all to scale up/out. Is there some way to reconcile these competing concerns? Am I thinking about it the wrong way? Does this problem have a well-known solution in the CQS/ESB world? If not, then how does one decide what the "right level" of granularity in a Command should be? Is there some "standard" one can use as a starting point - sort of like 3NF in databases - and only deviate when careful profiling suggests a potentially significant performance benefit? Or is this possibly one of those things that, despite several strong opinions being expressed by various experts, is really just a matter of opinion?

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• Which pattern is best for large project

  - by shamim

  I have several years of software development experience, but I am not a keen and adroit programmer, to perform better I need helping hands. Recently I engaged in an ERP project. For this project want a very effective structure, which will be easily maintainable and have no compromise about performance issue. Below structures are now present in my old projects. Entity Layer BusinessLogic Layer. DataLogic Layer UI Layer. Bellow picture describe how they are internally connected. For my new project want to change my project structure, I want to follow below steps: Core Layer(common) BLL DAL Model UI Bellow picture describe how they are internally connected. Though goggling some initial type question’s are obscure to me, they are : For new project want to use Entity framework, is it a good idea? Will it increase my project performance? Will it more maintainable than previous structure? Entity Framework core disadvantages/benefits are? For my project need help to select best structure. Will my new structure be better than the old one?

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• Moving all UI logic to Client Side?

  - by Mag20

  Our team originally consisted of mostly server side developers with minimum expertise in Javascript. In ASP.NET we used to write a lot of UI logic in code-behind or more recently through controllers in MVC. A little while ago 2 high level client side developers joined our team. They can do in HTMl/CSS/Javascript pretty much anything that we could previously do with server-side code and server-side web controls: Show/hide controls Do validation Control AJAX refreshing So I started to think that maybe it would be more efficient to just create a high level API around our business logic, kinda like Amazon Fulfillment API: http://docs.amazonwebservices.com/fws/latest/APIReference/, so that client side developers would fully take over the UI, while server side developers would only concentrate on business logic. So for ordering system you would have a high level API like: OrderService.asmx CreateOrderResponse CreateOrder(CreateOrderRequest) AddOrderItem AddPayment - SubmitPayment - GetOrderByID FindOrdersByCriteria ... There would be JSON/REST access to API, so it would be easy to consume from client-side UI. We could use this API for both internal UI development and also for 3-rd parties to create their own applications. With advances in Javascript and availability of good client side developers, is it a good time to get rid of code-behind/controllers and just concentrate on developing high level APIs (ala Amazon) that client side developers can consume?

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• Disaster Recovery Example

  Previously, I use to work for a small internet company that sells dental plans online. Our primary focus concerning disaster prevention and recovery is on our corporate website and private intranet site. We had a multiphase disaster recovery plan that includes data redundancy, load balancing, and off-site monitoring. Data redundancy is a key aspect of our disaster recovery plan. The first phase of this is to replicate our data to multiple database servers and schedule daily backups of the databases that are stored off site. The next phase is the file replication of data amongst our web servers that are also backed up daily by our collocation. In addition to the files located on the server, files are also stored locally on development machines, and again backed up using version control software. Load balancing is another key aspect of our disaster recovery plan. Load balancing offers many benefits for our system, better performance, load distribution and increased availability. With our servers behind a load balancer our system has the ability to accept multiple requests simultaneously because the load is split between multiple servers. Plus if one server is slow or experiencing a failure the traffic is diverted amongst the other servers connected to the load balancer allowing the server to get back online. The final key to our disaster recovery plan is off-site monitoring that notifies all IT staff of any outages or errors on the main website encountered by the monitor. Messages are sent by email, voicemail, and SMS. According to Disasterrecovery.org, disaster recovery planning is the way companies successfully manage crises with minimal cost and effort and maximum speed compared to others that are forced to make decision out of desperation when disasters occur. In addition Sun Guard stated in 2009 that the first step in disaster recovery planning is to analyze company risks and factor in fixed costs for things like hardware, software, staffing and utilities, as well as indirect costs, such as floor space, power protection, physical and information security, and management. Also availability requirements need to be determined per application and system as well as the strategies for recovery.

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• what tools and technologies an Technical Java Architect must hava [on hold]

  - by vicky

  I have more then eight years of experience in different Java tools, technologies and domains. Currently I am employed as a Technical Java Architect. I have worked on mobile, web, webservices, database, backend and desktop applications during this period. Everything was OK untill I got a few very good offers regarding an enterprise architect, solutions architect, java architects roles. But each one required different tool set. One was regarding experience in all Apache stack and technologies. So, help me which tools and technologies a real java technical Architect shuold have ? So that I can equip myself with that. Thanks.

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• Oracle Exadata???????????????????

  - by takashi.hitomi

  2010?6????????????????????Oracle Exadata??????????????! ???????Oracle Exadata?????? ?????????2010 ???????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????? Oracle?Smart Grid????????Oracle Exadata??????????????????????????? ?21? ??·?????????? ????????????????? ????????????????????????????????????????????????????????????·?·????????????????????????????????????????????? ?????????????????????????????????????????????????????? ????????Oracle Exadata?????????????Oracle Database????????·?????????????? ?????????Update?Get?? Oracle Cloud Computing Summit ~ Database & Exadata Day ~ Oracle Cloud Computing Summit??????1? ????·??????????Oracle????????????????????????? ?????????·?????????????????????????????????·??????????????????????????????????????

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