logo
down
shadow

Best practices with object manager


Best practices with object manager

By : safetys
Date : October 23 2020, 11:12 AM
it helps some times Couple of comments:
Use a std::vector to hold your client objects, not some sort of homegrown structure. It'll make your life easier I think it's fine if get() returns a reference provided that the user does know that the reference can be invalidated if they hang on to it for too long I'd throw an exception in get() if the element isn't there; that's what exceptions are for and it will allow you to handle the missing element at the appropriate level
code :


Share : facebook icon twitter icon
DAO (data access object) best practices - examples I see use a DAO and a Services object both, what is the best practice

DAO (data access object) best practices - examples I see use a DAO and a Services object both, what is the best practice


By : Claude
Date : March 29 2020, 07:55 AM
To fix the issue you can do Typically you put DAOs in a service layer because as your app gets more complicated, you will do useful and non trivial things in the service. For example, you might coordinate complicated data operations with more than 1 DAO. Service layers also provide API boundaries that demarcate cross cutting concerns, like transaction management, authorization checks, performance logging, etc.
Another reason its good to abstract your functionality into services is that it promotes reusable and maintainable components. When you start, you might be interested in just presenting some html. You write a service that loads some data, and handle the html part in the layer above the service layer (presentation layer). Now you want to stand up a RESTful webservice. Your service layer can be reused to load the data; all you have to worry about is the json or xml your webservice endpoint returns (and of course the REST semantics).
Python & Redis: Manager/Worker application best practices

Python & Redis: Manager/Worker application best practices


By : admin2
Date : March 29 2020, 07:55 AM
To fix this issue Your problem is that you are trying to run multiple commands concurrently with a single redis connection.
You are expecting something like
code :
Thread 1     Thread 2
LLEN test    
1                            
LPOP test   
command      
             LLEN test
             0
Thread 1     Thread 2
LLEN test    
1                            
LPOP test   
             LLEN test
             command
0
Best practices for cache and session manager for an MVC Application

Best practices for cache and session manager for an MVC Application


By : SHA
Date : March 29 2020, 07:55 AM
should help you out You could create an interface to define the common operations used in Caching and Session management, named something like IStateManager. e.g.
code :
/// <summary>
/// An interface to provide access to a state storage implementation
/// </summary>
public interface IStateManager
{
    /// <summary>
    /// Gets or sets the value associated with the specified key.
    /// </summary>
    /// <typeparam name="T">Type</typeparam>
    /// <param name="key">The key of the value to get.</param>
    /// <returns>The value associated with the specified key.</returns>
    T Get<T>(string key);

    /// <summary>
    /// Adds the specified key and object to the state manager.
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="data">Data</param>
    void Set(string key, object data);

    /// <summary>
    /// Adds the specified key and object to the state manager.
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="data">Data</param>
    /// <param name="cacheTime">Cache time</param>
    void Set(string key, object data, int cacheTime);

    /// <summary>
    /// Gets a value indicating whether the value associated with the specified key is in the state manager.
    /// </summary>
    /// <param name="key">key</param>
    /// <returns>Result</returns>
    bool IsSet(string key);

    /// <summary>
    /// Removes the value with the specified key from the state manager.
    /// </summary>
    /// <param name="key">/key</param>
    void Remove(string key);

    /// <summary>
    /// Removes items by pattern
    /// </summary>
    /// <param name="pattern">pattern</param>
    void RemoveByPattern(string pattern);

    /// <summary>
    /// Clear all state manager data
    /// </summary>
    void Clear();
}
/// <summary>
/// Represents an in memory cache
/// </summary>
public class MemoryCacheManager : IStateManager
{
    public MemoryCacheManager()
    {
    }

    protected ObjectCache Cache
    {
        get
        {
            return MemoryCache.Default;
        }
    }

    /// <summary>
    /// Gets or sets the value associated with the specified key.
    /// </summary>
    /// <typeparam name="T">Type</typeparam>
    /// <param name="key">The key of the value to get.</param>
    /// <returns>The value associated with the specified key.</returns>
    public T Get<T>(string key)
    {
        return (T)Cache[key];
    }

    /// <summary>
    /// Adds the specified key and object to the cache with a default cache time of 30 minutes.
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="data">Data</param>
    public void Set(string key, object data)
    {
        Set(key, data, 30);
    }

    /// <summary>
    /// Adds the specified key and object to the cache.
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="data">Data</param>
    /// <param name="cacheTime">Cache time</param>
    public void Set(string key, object data, int cacheTime)
    {
        if (data == null)
            return;

        var policy = new CacheItemPolicy();
        policy.AbsoluteExpiration = DateTime.Now + TimeSpan.FromMinutes(cacheTime);
        Cache.Add(new CacheItem(key, data), policy);
    }

    /// <summary>
    /// Gets a value indicating whether the value associated with the specified key is cached
    /// </summary>
    /// <param name="key">key</param>
    /// <returns>Result</returns>
    public bool IsSet(string key)
    {
        return (Cache.Contains(key));
    }

    /// <summary>
    /// Removes the value with the specified key from the cache
    /// </summary>
    /// <param name="key">/key</param>
    public void Remove(string key)
    {
        Cache.Remove(key);
    }

    /// <summary>
    /// Removes items by pattern
    /// </summary>
    /// <param name="pattern">pattern</param>
    public void RemoveByPattern(string pattern)
    {
        var regex = new Regex(pattern, RegexOptions.Singleline | RegexOptions.Compiled | RegexOptions.IgnoreCase);
        var keysToRemove = new List<String>();

        foreach (var item in Cache)
            if (regex.IsMatch(item.Key))
                keysToRemove.Add(item.Key);

        foreach (string key in keysToRemove)
        {
            Remove(key);
        }
    }

    /// <summary>
    /// Clear all cache data
    /// </summary>
    public void Clear()
    {
        foreach (var item in Cache)
            Remove(item.Key);
    }
}
Best practices for implementing an iOS download manager with progress view

Best practices for implementing an iOS download manager with progress view


By : Tarcísio Skóra
Date : March 29 2020, 07:55 AM
I hope this helps you . The block approach is useful if the lifespan of the downloader is controlled by the VC. This way, when the VC is released, it releases the downloader (the downloader would not be a singleton). If not you risk creating captured objects (the VC) that cannot be released because they are referenced in your block, and your block is referenced by an "eternal" object (the singleton).
As the VC lifespan is potentially shorter than the downloader, a better option would be to use some subscription-based observing of the downloader singleton.
What are the best practices in creating a data access layer for an object that has a reference to another object?

What are the best practices in creating a data access layer for an object that has a reference to another object?


By : user3739163
Date : March 29 2020, 07:55 AM
it fixes the issue Don't write something buggy, inefficient, and specialized ... when reliable, efficient, and generic tools are available. For free.
Pick an ORM. NHibernate, ActiveRecord, SubSonic, NPersist, LinqToEF, LinqToSQL, LLBLGenPro, DB4O, CSLA, etc.
Related Posts Related Posts :
  • How to use priority_queue with a non-static compare method of class instance?
  • Template parameters inside and outside class/struct
  • Determining prime number
  • How to resolve ambiguity between constructors taking std::string and std::vector
  • My program crashes when I try to change private values from an object
  • Unordered_map with custom class as key
  • Strict aliasing rules broken with templates and inheritance
  • C++ Derived Class Override Return Type
  • singly linked list c++ constructor, destructor and printing out
  • How to clone class with vector of unique_ptr to base class
  • error: no match for operator
  • std::vector doesnt accept my struct as template
  • selection of people's contours
  • how to fix the (Error using mexOpenCV) on matlab?
  • Is or was there a proposal for c++ to use the context for short enum values?
  • Fair assumptions about std::hash implementations
  • undefined reference to libusb using cyusb
  • Function returns null pointer instead of address
  • C++17 copy elision and object destruction
  • Input multiple strings via operator>> c++
  • Avoiding overflow boost container
  • How to Write a Lambda Wrapping a Function with Optional Return Value
  • Partial specialization with more template parameters
  • How to convert fixed size array to pointer on pointer array
  • Memory leak in const member constructor with tag dispatching
  • C++ function with a generic and optional class
  • Custom QGraphicsItem That Contains Child QGraphicsItems
  • Are There Restrictions on What can be Passed to auto Template Parameters?
  • Rotating line inside rectangle bounds
  • Why do I need dynamic memory allocation if I can just create an array?
  • How can I convert a text file into a form that MPI_Bcast can send?
  • How to get array of all `this` of an instance
  • Using pointers as parameters
  • Automatic type deduction with const_cast is not working
  • Why does std::is_rvalue_reference not do what it is advertised to do?
  • Function Template Specialization with Forward Declared Type
  • template deduction failed in vector
  • Is there a signed `sizeof` alternative in Qt
  • clarification on overloading the -> operator
  • What is __m128d?
  • QtConcurrent: why releaseThread and reserveThread cause deadlock?
  • Function receiving different value than passed
  • Can C++ close a '''fstream''' variable after '''.close()'''?
  • Is it necessary to overload operator in this specific case
  • Comparing an element of a string array with a string
  • how to dereference a pointer of a map of pointers to objects in c++
  • How recursive function control flow change for static variable?
  • SDL 2 blitting BMP File
  • Why does an extremely large value cause this code to repeat infinitely?
  • Function returning different value than what is in function body before return statement
  • Struggling with including Headers in another header file (C++)
  • WebViewProcessControl initialization crash
  • C++ exception 0xC00000FD: Stack overflow (parameters: 0x00000001, 0x00C02F30)
  • What's difference between forward and move in the constructor of class?
  • C++: Is it possible to condense `bool` objects within the same byte?
  • I cant understand this access modifier
  • Boost Spirit X3: Collapsing one-element lists
  • How can I add a char to an istringstream?
  • Wrapping variadic templates in pybind11
  • C++ referencing instances created within a function's scope
  • shadow
    Privacy Policy - Terms - Contact Us © bighow.org