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A pattern for returning an object created by multiple repositories


A pattern for returning an object created by multiple repositories

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A pattern for returning an object created by multiple repositories
Tag : chash , By : user180941
Date : November 24 2020, 09:00 AM

I wish did fix the issue. I usually make use of repositories to run on my Aggregate Roots.
Martin Fowler defined aggregate root as

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NHibernate : pattern for returning fully loaded instances from repositories


Tag : nhibernate , By : Matthew Steed
Date : March 29 2020, 07:55 AM
wish of those help Use dependency injection and pass an ISession to your repository classes through their constructors. That's the only way to allow multiple repositories to participate in the same transaction.
Your website should have some knowledge of an ISession because that's where the transaction boundaries are defined. You can use session-per-request pattern so that the ISession is only referenced in an HttpRequest module or Global.asax. Or you can use a framework or embrace NHibernate and control transactions on the pages.

Simple Repository Pattern Question: How to query across multiple repositories efficiently?


Tag : development , By : Michael T.
Date : March 29 2020, 07:55 AM
around this issue It's not required to expose IQueryable, but if you don't then you run into exactly the problem you're describing: You can't further compose the queries.
One solution is to put an entity service layer in front of the repository. The service layer is EF-ignorant, but can do LINQ projections. Projecting in LINQ results in a composed, single DB query.

C#/EF and the Repository Pattern: Where to put the ObjectContext in a solution with multiple repositories?


Tag : chash , By : Barry
Date : March 29 2020, 07:55 AM
To fix the issue you can do A design with multiple ObjectContext instances is only acceptable if your Repository methods commit the transaction. Otherwise, it is possible that external calls to commit the transaction may not persist everything you intend, because you will hold references to different instances of the ObjectContext.
If you want to restrict the ObjectContext to a single instance, then you can build a RepositoryProvider class that contains the ObjectContext, and manages the propagation of repository actions to data commits. This can be best accomplished by either, - Injecting the ObjectContext reference into each repository, or - Subscribing the repositories' events to EventHandlers that call the appropriate methods on the ObjectContext.
public interface IRepositoryProvider
{
    IRepository this[Type repositoryType] { get; }
}
public interface IFilteredRepositoryFactory{
   bool CanCreateRepository(Type repositoryType);
   IRepository CreateRepository(Type repositoryType, ObjectContext context);
}
public class RepositoryProvider
{
    public RepositoryProvider(ObjectContext context, IEnumerable<IFilteredRepositoryFactory> repositoryFactories)
    {
        _context = context;
        _repositoryFactories = repositoryFactories;
    }

    private readonly ObjectContext _context;
    private readonly IEnumerable<IFilteredRepositoryFactory> _repositoryFactories;
    private readonly Dictionary<Type, IRepository> _loadedRepositories;

    IRepository this[Type repositoryType]
    {
        get
        {
            if(_loadedRepositories.ContainsKey(repositoryType))
            {
                return _loadedRepositories[repositoryType];
            }
            var repository = GetFactory(repositoryType).CreateRepository(repositoryType, _context);
            _loadedRepositories.Add(repositoryType,repository);
            return repository;
        }
    }

    IFilteredRepositoryFactory GetFactory(Type repositoryType)
    {
        //throws an exception if no repository factory is found
        return _repositoryFactories.First(x => x.CanCreateRepository(repositoryType));
    }
}

Should JPA Repositories be created by Table or Object?


Tag : java , By : hlpimfalling
Date : March 29 2020, 07:55 AM
wish helps you I solved it by creating a custom implementation of the repository, implementing a custom interface.
First I had to declare the interface:
public interface CustomQuery {
    public List<Integer>myCustomQuery(int id)
}
@Component
public class MediaRepositoryImpl implements CustomQuery {
    @PersistenceContext
    EntityManager manager;

    public List<Integer>myCustomQuery(int id){
        Query q = manager.createNativeQuery(SQL_QUERY_GOES_HERE);
        List<Integer> ids = new ArratList<Integer>();

        @SuppressWarnings("unchecked")
        List<Integer> result  = q.getResultList();
        for(Integer o : result){
            //process the results and add them to the list
        }
        return list;
    }
}

How could I deploy multiple maven artifacts to multiple nexus repositories including snapshot repositories without havin


Tag : maven , By : Brandon
Date : March 29 2020, 07:55 AM
Any of those help The only solution that comes to my mind is using properties and adding three executions during deployment. The ugly thing is that in case of SNAPSHOT your artifact would be deployed twice to the same repository.
Here is what you could do:
<plugin>
    <groupId>org.codehaus.groovy.maven</groupId>
    <artifactId>gmaven-plugin</artifactId>
    <version>1.0</version>
    <executions>
        <execution>
            <id>eval-repo</id>
            <phase>initialize</phase>
            <goals>
                <goal>execute</goal>
            </goals>
            <configuration>
                <source>
                    if (project.version.endsWith("-SNAPSHOT")){
                    project.properties.repoId = "snapshots";
                    project.properties.repoUrl = "snapshots url";
                    project.properties.thirdPartyRepoId =   "snapshots";
                    project.properties.thirdPartyRepoUrl = "snapshots url";                             
                    }
                    else {
                    project.properties.repoId = "releases";
                    project.properties.repoUrl = "releases url";
                    project.properties.thirdPartyRepoId =   "thirdparty";
                    project.properties.thirdPartyRepoUrl = "thirdparty url";                                    
                    }
                </source>
            </configuration>
        </execution>
    </executions>
</plugin>
    <configuration>
        <artifactId>gateway-client</artifactId>
        <url>${repoUrl}</url>
        <repositoryId>${repoId}</repositoryId>
        ...

    <configuration>
        <artifactId>gateway-services-client</artifactId>
        <url>${repoUrl}</url>
        <repositoryId>${repoId}</repositoryId>
        ...

    <configuration>
        <artifactId>gateway-services-client</artifactId>
        <url>${thirdPartyRepoId}</url>
        <repositoryId>${thirdPartyRepoUrl}</repositoryId>
        ...
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