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Mark J Price 2022-09-05 10:51:15 +01:00
parent ded4870ccb
commit c4cde7875a
2 changed files with 32 additions and 32 deletions
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32
vs4win/PracticalApps/Northwind.WebApi/Repositories/CustomerRepository.cs
View file

@ -6,21 +6,21 @@ namespace Northwind.WebApi.Repositories;
public class CustomerRepository : ICustomerRepository
{
// use a static thread-safe dictionary field to cache the customers
// Use a static thread-safe dictionary field to cache the customers.
private static ConcurrentDictionary
<string, Customer>? customersCache;
// use an instance data context field because it should not be
// cached due to their internal caching
// Use an instance data context field because it should not be
// cached due to the data context having internal caching.
private NorthwindContext db;
public CustomerRepository(NorthwindContext injectedContext)
{
db = injectedContext;
// pre-load customers from database as a normal
// Pre-load customers from database as a normal
// Dictionary with CustomerId as the key,
// then convert to a thread-safe ConcurrentDictionary
// then convert to a thread-safe ConcurrentDictionary.
if (customersCache is null)
{
customersCache = new ConcurrentDictionary<string, Customer>(
@ -30,16 +30,16 @@ public class CustomerRepository : ICustomerRepository
public async Task<Customer?> CreateAsync(Customer c)
{
// normalize CustomerId into uppercase
// Normalize CustomerId into uppercase.
c.CustomerId = c.CustomerId.ToUpper();
// add to database using EF Core
// Add to database using EF Core.
EntityEntry<Customer> added = await db.Customers.AddAsync(c);
int affected = await db.SaveChangesAsync();
if (affected == 1)
{
if (customersCache is null) return c;
// if the customer is new, add it to cache, else
// call UpdateCache method
// If the customer is new, add it to cache, else
// call UpdateCache method.
return customersCache.AddOrUpdate(c.CustomerId, c, UpdateCache);
}
else
@ -50,14 +50,14 @@ public class CustomerRepository : ICustomerRepository
public Task<IEnumerable<Customer>> RetrieveAllAsync()
{
// for performance, get from cache
// For performance, get from cache.
return Task.FromResult(customersCache is null
? Enumerable.Empty<Customer>() : customersCache.Values);
}
public Task<Customer?> RetrieveAsync(string id)
{
// for performance, get from cache
// For performance, get from cache.
id = id.ToUpper();
if (customersCache is null) return null!;
customersCache.TryGetValue(id, out Customer? c);
@ -82,15 +82,15 @@ public class CustomerRepository : ICustomerRepository
public async Task<Customer?> UpdateAsync(string id, Customer c)
{
// normalize customer Id
// Normalize customer Id.
id = id.ToUpper();
c.CustomerId = c.CustomerId.ToUpper();
// update in database
// Update in database.
db.Customers.Update(c);
int affected = await db.SaveChangesAsync();
if (affected == 1)
{
// update in cache
// Update in cache.
return UpdateCache(id, c);
}
return null;
@ -99,7 +99,7 @@ public class CustomerRepository : ICustomerRepository
public async Task<bool?> DeleteAsync(string id)
{
id = id.ToUpper();
// remove from database
// Remove from database.
Customer? c = db.Customers.Find(id);
if (c is null) return null;
db.Customers.Remove(c);
@ -107,7 +107,7 @@ public class CustomerRepository : ICustomerRepository
if (affected == 1)
{
if (customersCache is null) return null;
// remove from cache
// Remove from cache.
return customersCache.TryRemove(id, out c);
}
else

32
vscode/PracticalApps/Northwind.WebApi/Repositories/CustomerRepository.cs
View file

@ -6,21 +6,21 @@ namespace Northwind.WebApi.Repositories;
public class CustomerRepository : ICustomerRepository
{
// use a static thread-safe dictionary field to cache the customers
// Use a static thread-safe dictionary field to cache the customers.
private static ConcurrentDictionary
<string, Customer>? customersCache;
// use an instance data context field because it should not be
// cached due to their internal caching
// Use an instance data context field because it should not be
// cached due to the data context having internal caching.
private NorthwindContext db;
public CustomerRepository(NorthwindContext injectedContext)
{
db = injectedContext;
// pre-load customers from database as a normal
// Pre-load customers from database as a normal
// Dictionary with CustomerId as the key,
// then convert to a thread-safe ConcurrentDictionary
// then convert to a thread-safe ConcurrentDictionary.
if (customersCache is null)
{
customersCache = new ConcurrentDictionary<string, Customer>(
@ -30,16 +30,16 @@ public class CustomerRepository : ICustomerRepository
public async Task<Customer?> CreateAsync(Customer c)
{
// normalize CustomerId into uppercase
// Normalize CustomerId into uppercase.
c.CustomerId = c.CustomerId.ToUpper();
// add to database using EF Core
// Add to database using EF Core.
EntityEntry<Customer> added = await db.Customers.AddAsync(c);
int affected = await db.SaveChangesAsync();
if (affected == 1)
{
if (customersCache is null) return c;
// if the customer is new, add it to cache, else
// call UpdateCache method
// If the customer is new, add it to cache, else
// call UpdateCache method.
return customersCache.AddOrUpdate(c.CustomerId, c, UpdateCache);
}
else
@ -50,14 +50,14 @@ public class CustomerRepository : ICustomerRepository
public Task<IEnumerable<Customer>> RetrieveAllAsync()
{
// for performance, get from cache
// For performance, get from cache.
return Task.FromResult(customersCache is null
? Enumerable.Empty<Customer>() : customersCache.Values);
}
public Task<Customer?> RetrieveAsync(string id)
{
// for performance, get from cache
// For performance, get from cache.
id = id.ToUpper();
if (customersCache is null) return null!;
customersCache.TryGetValue(id, out Customer? c);
@ -82,15 +82,15 @@ public class CustomerRepository : ICustomerRepository
public async Task<Customer?> UpdateAsync(string id, Customer c)
{
// normalize customer Id
// Normalize customer Id.
id = id.ToUpper();
c.CustomerId = c.CustomerId.ToUpper();
// update in database
// Update in database.
db.Customers.Update(c);
int affected = await db.SaveChangesAsync();
if (affected == 1)
{
// update in cache
// Update in cache.
return UpdateCache(id, c);
}
return null;
@ -99,7 +99,7 @@ public class CustomerRepository : ICustomerRepository
public async Task<bool?> DeleteAsync(string id)
{
id = id.ToUpper();
// remove from database
// Remove from database.
Customer? c = db.Customers.Find(id);
if (c is null) return null;
db.Customers.Remove(c);
@ -107,7 +107,7 @@ public class CustomerRepository : ICustomerRepository
if (affected == 1)
{
if (customersCache is null) return null;
// remove from cache
// Remove from cache.
return customersCache.TryRemove(id, out c);
}
else