birt barcode maximo Procedure-Level Atomicity in Objective-C

Produce ECC200 in Objective-C Procedure-Level Atomicity

wchar_t* random_string(wchar_t* wcs, int n) { for (int i = 0; i < n - 1; i++) { wcs[i] = (wchar_t) floor(((double) rand() / (double) RAND_MAX * 26)) + L'A'; } return wcs; } // Try commenting out the pragma above random_string and uncomment this: // #pragma managed. int main() { wchar_t wcs1[100]; wchar_t* wcs2 = new wchar_t[100]; memset(wcs1, 0, 100 * sizeof(wchar_t)); clock_t t = clock(); const int num_iter = 100000; for (int i = 0; i < num_iter; i++) { random_string(wcs1, 100); native_function(wcs2, wcs1); } double time_elapsed = (clock()-t)/(double)CLOCKS_PER_SEC; printf("total time elapsed: %2.2f seconds\n", time_elapsed); } On my system, when I execute the code in Listing 13-18 with native_function as native code and random_string as managed code, the execution time is 1.3 seconds. On the other hand, if both native_code and random_string are made native by moving the comment as suggested, we can avoid the transition on each loop and the execution time gets down to .73 seconds, which is just as fast (at least to two decimal places) as fully native code compiled with /O2, also .73 seconds.

Editable root objects in CSLA .NET implement a Save() method. This includes objects that inherit from both BusinessBase and BusinessListBase. The ISavable interface formalizes the concept of a savable object, which really means an editable root object. You can use this interface to create a UI framework that can save any editable root object: public interface ISavable { object Save(); void SaveComplete(object newObject); event EventHandler<SavedEventArgs> Saved; }

Although such an application might run on a single machine, it s more likely that the application will run on a web server, or be split between a smart client and an application server. Given these varied physical environments, we re faced with the following questions: Where do the objects reside Are the objects designed to maintain state, or should they be stateless How is object-to-relational mapping handled when retrieving or storing data in the database How are database transactions managed Before getting into discussing some answers to these questions, it s important to fully understand the difference between a physical architecture and a logical architecture. After that, I ll define objects and mobile objects, and see how they fit into the architectural discussion. When most people talk about n-tier applications, they re talking about physical models in which the application is spread across multiple machines with different functions: a client, a web server, an application server, a database server, and so on. And this isn t a misconception these are indeed n-tier systems. The problem is that many people tend to assume there s a one-to-one relationship between the tiers in a logical model and the tiers in a physical model, when in fact that s not always true. A physical n-tier architecture is quite different from a logical n-tier (or n-layer) architecture. The latter has nothing to do with the number of machines or network hops involved in running the application. Rather, a logical architecture is all about separating different types of functionality. The most common logical separation is into a UI layer, a business layer, and a data layer that may exist on a single machine, or on three separate machines the logical architecture doesn t define those details.

Generic delegates are very much like nongeneric delegates, except that the type parameters determine the characteristics of what methods will be accepted. To declare a generic delegate, place the type parameter list in angle brackets after the delegate name and before the delegate parameter list.