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  • I am trying to figure out the best way to understand how to cache domain objects

    - by Brett Ryan
    I've always done this wrong, I'm sure a lot of others have too, hold a reference via a map and write through to DB etc.. I need to do this right, and I just don't know how to go about it. I know how I want my objects to be cached but not sure on how to achieve it. What complicates things is that I need to do this for a legacy system where the DB can change without notice to my application. So in the context of a web application, let's say I have a WidgetService which has several methods: Widget getWidget(); Collection<Widget> getAllWidgets(); Collection<Widget> getWidgetsByCategory(String categoryCode); Collection<Widget> getWidgetsByContainer(Integer parentContainer); Collection<Widget> getWidgetsByStatus(String status); Given this, I could decide to cache by method signature, i.e. getWidgetsByCategory("AA") would have a single cache entry, or I could cache widgets individually, which would be difficult I believe; OR, a call to any method would then first cache ALL widgets with a call to getAllWidgets() but getAllWidgets() would produce caches that match all the keys for the other method invocations. For example, take the following untested theoretical code. Collection<Widget> getAllWidgets() { Entity entity = cache.get("ALL_WIDGETS"); Collection<Widget> res; if (entity == null) { res = loadCache(); } else { res = (Collection<Widget>) entity.getValue(); } return res } Collection<Widget> loadCache() { // Get widgets from underlying DB Collection<Widget> res = db.getAllWidgets(); cache.put("ALL_WIDGETS", res); Map<String, List<Widget>> byCat = new HashMap<>(); for (Widget w : res) { // cache by different types of method calls, i.e. by category if (!byCat.containsKey(widget.getCategory()) { byCat.put(widget.getCategory(), new ArrayList<Widget>); } byCat.get(widget.getCatgory(), widget); } cacheCategories(byCat); return res; } Collection<Widget> getWidgetsByCategory(String categoryCode) { CategoryCacheKey key = new CategoryCacheKey(categoryCode); Entity ent = cache.get(key); if (entity == null) { loadCache(); } ent = cache.get(key); return ent == null ? Collections.emptyList() : (Collection<Widget>)ent.getValue(); } NOTE: I have not worked with a cache manager, the above code illustrates cache as some object that may hold caches by key/value pairs, though it's not modelled on any specific implementation. Using this I have the benefit of being able to cache all objects in the different ways they will be called with only single objects on the heap, whereas if I were to cache the method call invocation via say Spring It would (I believe) cache multiple copies of the objects. I really wish to try and understand the best ways to cache domain objects before I go down the wrong path and make it harder for myself later. I have read the documentation on the Ehcache website and found various articles of interest, but nothing to give a good solid technique. Since I'm working with an ERP system, some DB calls are very complicated, not that the DB is slow, but the business representation of the domain objects makes it very clumsy, coupled with the fact that there are actually 11 different DB's where information can be contained that this application is consolidating in a single view, this makes caching quite important.

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  • Which folders need to be backed up for migration in Joomla?

    - by Devdatta Tengshe
    I'm helping someone update & migrate their old website, built on the Joomla framework. Currently it is running on Joomla 1.5.8 which is an ancient version. I've convinced them to upgrade Joomla to at least 2.5 I have already made a backup of the database. Most links I have seen talk of backing up the entire public_html folder (The website runs on a shared host). But in my fresh Joomla installation there are several folders that are in the public_html folder. So which of the folders in the public_html folder are from the content of the website, and which are of the old Joomla framework? I'm afraid that I might overwrite files of the new Joomla framework with the old framework, if copy all the files and folders into the new installation.

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  • Which folders need to be backedup for migration in Joomla?

    - by Devdatta Tengshe
    I have never used Joomla before, so this might be a noobish question. I have tried searching, but haven't found anything relevant. I'm helping someone update & migrate their old website, built on the Joomla framework. Currently it is running on Joomla 1.5.8 which is an ancient version. I've convinced them to upgrade Joomla to atleast 2.5 I have already taken the database backup. Most links I have seen talk of backing up the entire public_html folder (The website runs on a shared host). But in my fresh Joomla installation there are several folders that are in the public_html folder. So which of the folders in the public_html folder are from the content of the website, and which are of the old Joomla framework? I'm afraid that I might overwrite files of the new Joomla framework with the old framework, if copy all the files and folders into the new installation.

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  • Upgrading to x64 results in HTTP 500

    - by Dour High Arch
    I upgraded my development machine to 64-bit Win7, and now when I try to connect to a local ASP.Net project I get: HTTP Error 500 ... Calling LoadLibraryEx on ISAPI filter "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_filter.dll" failed There are several puzzling things about this; the ASP.Net project was a .Net 2.0 ASMX so it was using C:\Windows\Microsoft.NET\Framework\v2.0.50727. If it updated to x64 without asking me, should it not use C:\Windows\Microsoft.NET\Framework64\v2.0.50727\? Where is C:\Windows\Microsoft.NET\Framework\v4.0.30319\ coming from? I opened IIS Manager and the selected .Net Framework version for my machine is 2.0.50727. Framework version for my default application pool is the same. I am developing in VS2008, which does not even have an option for targeting .Net 4.0.

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  • Start a new project. Where is the inspiration ?

    - by Kakawait
    The question may seem strange at first glance ... And I may be alone in this situation. But currently I want to improve my skill through learning new framework. however, do a simple "HelloWorld" application does not satisfy me. I think a practical project is required to apprehend the basics of a framework. I know there is many scholar-like project like design a library manager or CMS. But I have recently planned to learn ~3 differents frameworks and I can't find any motivations through "unexciting" project. In the end I have not started any framework ... I'm aware of I do not develop the project of the year ... I'm just looking for something a bit exciting. I do not expect any project subject, anyway stimulation provided by a project is something subjective. But I want to know your inspiration ! (or method to learn framework ^^) I'm talking about web-dev framework but I'm open to any kind information ! Kind regards.

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  • How can I get a list of default documents in IIS using PowerShell?

    - by SGarratt
    I'm managing a Server Core machine and trying to do everything in PowerShell, which is fun. I need a list of the default documents. From other websites, I've found out how to set and remove them, using both xxx-WebConfiguration and xxx-WebConfigurationProperty. I've tried: Get-WebConfigurationProperty -Filter /system.webServer/defaultDocument -PSPath "IIS:\sites\Default Web Site" -Name files but it gives: Collection : {Microsoft.IIs.PowerShell.Framework.ConfigurationElement, Microsoft.IIs.PowerShell.Framework.Configuration Element, Microsoft.IIs.PowerShell.Framework.ConfigurationElement, Microsoft.IIs.PowerShell.Framework.Confi gurationElement...} ItemXPath : /system.webServer/defaultDocument Attributes : {} ChildElements : {} ElementTagName : files Methods : Schema : Microsoft.IIs.PowerShell.Framework.ConfigurationElementSchema which doesn't really help.

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  • New Versions of Whitepapers are available

    - by Anthony Shorten
    The set of whitepapers that are available are progressively being updated and republished to reflect new versions of the products as well new advice for existing customers. A number of whitepapers are now available that have been updated (the My Oracle Support Doc Id is indicated): What’s New in Oracle Utilities Application Framework V4 (Doc Id: 1177265.1) -  This has been updated for the latest facilities in Oracle Utilities Application Framework V4.1. Batch Best Practices (Doc Id: 836362.1) – This has been updated for newer advice including more details of how CLUSTERED mode works, how to migrate to CLUSTERED mode and some configuration examples to cover typical configuration scenarios. Oracle Utilities Application Framework Architecture Guidelines (Doc Id: 807068.1) – This has been updated to reflect additional architecture advice. Performance Troubleshooting Guides (Doc Id: 560382.1) – This has been updated for the latest facilities in Oracle Utilities Application Framework V4.1 and includes additional techniques that have been used by customers to track performance. The whitepapers apply to all Oracle Utilities Application Framework Products which at the present time includes: Oracle Utilities Customer Care And Billing (V2.x) Oracle Enterprise Taxation Management (V2.x) Oracle Utilities Business Intelligence (V2.x) Oracle Utilities Meter Data Management (V2.x) Oracle Utilities Mobile Workforce Management (V2.x) Oracle Utilities Smart Grid Gateway (V2.x) Additional whitepapers and updates will be posted as they are available.

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  • Visual Studio 2010 Web Development Improvements

    - by Aamir Hasan
    VS2010 emulates what is available in previous framework versions through reference assemblies. These assemblies contain metadata that describes functionality available in previous versions. VS2010 itself uses the .NET 4 framework, so when adding multitargeting support the team decided against running a previous framework version inside the same process. When your application is compiled to 100 percent guarantee application compatibility, previous compiler versions are used.Web development in Visual Studio 2010 has been enhanced for greater CSS compatibility, increased productivity through HTML and ASP.NET markup snippets and new dynamic IntelliSense JavaScript.Improved CSS CompatibilityHTML and JavaScript SnippetsJavaScript IntelliSense Enhancements

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  • RhinoMocks Testing callback method

    - by joblot
    Hi All I have a service proxy class that makes asyn call to service operation. I use a callback method to pass results back to my view model. Doing functional testing of view model, I can mock service proxy to ensure methods are called on the proxy, but how can I ensure that callback method is called as well? With RhinoMocks I can test that events are handled and event raise events on the mocked object, but how can I test callbacks? ViewModel: public class MyViewModel { public void GetDataAsync() { // Use DI framework to get the object IMyServiceClient myServiceClient = IoC.Resolve<IMyServiceClient>(); myServiceClient.GetData(GetDataAsyncCallback); } private void GetDataAsyncCallback(Entity entity, ServiceError error) { // do something here... } } ServiceProxy: public class MyService : ClientBase, IMyServiceClient { // Constructor public NertiAdminServiceClient(string endpointConfigurationName, string remoteAddress) : base(endpointConfigurationName, remoteAddress) { } // IMyServiceClient member. public void GetData(Action<Entity, ServiceError> callback) { Channel.BeginGetData(EndGetData, callback); } private void EndGetData(IAsyncResult result) { Action<Entity, ServiceError> callback = result.AsyncState as Action<Entity, ServiceError>; ServiceError error; Entity results = Channel.EndGetData(out error, result); if (callback != null) callback(results, error); } } Thanks

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  • Jelly script to reset the issue resolution in JIRA

    - by edlftt
    I am trying to run a jelly script in JIRA to set the resolution to null for all my issues. The following script runs without errors and returns this: <JiraJelly xmlns:jira='jelly:com.atlassian.jira.jelly.JiraTagLib' xmlns:log='jelly:log' xmlns:core='jelly:core' xmlns:jx='jelly:xml' xmlns:util='jelly:util'>org.ofbiz.core.entity.GenericValue.NULL_VALUEorg.ofbiz.core.entity.GenericValue.NULL_VALUEorg.ofbiz.core.entity.GenericValue.NULL_VALUE.... </JiraJelly> Here is the script. <JiraJelly xmlns:jira="jelly:com.atlassian.jira.jelly.JiraTagLib" xmlns:util="jelly:util" xmlns:core="jelly:core" xmlns:jx="jelly:xml" xmlns:log="jelly:log"> <jira:RunSearchRequest var="issues" /> <core:forEach var="genericIssue" items="${issues}"> <core:invokeStatic className="com.atlassian.jira.issue.IssueImpl" method="getIssueObject" var="issue"> <core:arg type="org.ofbiz.core.entity.GenericValue" value="${genericIssue}"/> </core:invokeStatic> <core:invoke on="${issue}" method="setResolution"> <core:arg type="org.ofbiz.core.entity.GenericValue">org.ofbiz.core.entity.GenericValue.NULL_VALUE</core:arg> </core:invoke> </core:forEach> </JiraJelly> Does any one have any idea why this isn't working or have any ideas on how I might set the resolution to nothing? Thank you!!

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  • Persisting complex data between postbacks in ASP.NET MVC

    - by Robert Wagner
    I'm developing an ASP.NET MVC 2 application that connects to some services to do data retrieval and update. The services require that I provide the original entity along with the updated entity when updating data. This is so it can do change tracking and optimistic concurrency. The services cannot be changed. My problem is that I need to somehow store the original entity between postbacks. In WebForms, I would have used ViewState, but from what I have read, that is out for MVC. The original values do not have to be tamper proof as the services treat them as untrusted. The entities would be (max) 1k and it is an intranet app. The options I have come up are: Session - Ruled out - Store the entity in the Session, but I don't like this idea as there are no plans to share session between URL - Ruled out - Data is too big HiddenField - Store the serialized entity in a hidden field, perhaps with encryption/encoding HiddenVersion - The entities have a (SQL) version field on them, which I could put into a hidden field. Then on a save I get "original" entity from the services and compare the versions, doing my own optimistic concurrency. Cookies - Like 3 or 4, but using a cookie instead of a hidden field I'm leaning towards option 4, although 3 would be simpler. Are these valid options or am I going down the wrong track? Is there a better way of doing this?

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