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Once you have that set up, all you need is a small table to collect the statistics: create global temporary table run_stats ( runid varchar2(15), name varchar2(80), value int ) on commit preserve rows; Last, you need to create the package that is Runstats. It contains three simple API calls: RS_START (Runstats Start) to be called at the beginning of a Runstats test RS_MIDDLE to be called in the middle, as you might have guessed RS_STOP to finish off and print the report The specification is as follows: ops$tkyte%ORA11GR2> create or replace package runstats_pkg 2 as 3 procedure rs_start; 4 procedure rs_middle; 5 procedure rs_stop( p_difference_threshold in number default 0 ); 6 end; 7 / Package created. The parameter, p_difference_threshold, is used to control the amount of data printed at the end. Runstats collects statistics and latching information for each run, and then prints a report of how much of a resource each test (each approach) used and the difference between them. You can use this input parameter to see only the statistics and latches that had a difference greater than this number. By default, this is zero, and you see all of the outputs. Next, we"ll look at the package body procedure by procedure. The package begins with some global variables. These will be used to record the elapsed times for our runs: ops$tkyte%ORA11GR2> create or replace package body runstats_pkg 2 as 3 4 g_start number; 5 g_run1 number; 6 g_run2 number; 7 Next is the RS_START routine. This will simply clear out our statistics holding table and then populate it with the "before" statistics and latches. It will then capture the current timer value, a clock of sorts that we can use to compute elapsed times in hundredths of seconds: 8 9 10 11 12 13 14 15 procedure rs_start is begin delete from run_stats; insert into run_stats select "before", stats.* from stats;
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These three methods encapsulate the functionality provided by n-level undo. The ISupportUndo interface is implemented by all editable objects, both single objects and collections.
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The WS-Addressing specification enables messages to store their own addressing information, so that the source, destination, and reply URI locations are self-contained within the message. This allows a message to hop across multiple endpoints without losing information about the source of the original request. And it allows intermediate services to route and refer the message across multiple endpoints until eventually a response is sent back to the specified reply location. If you are writing a very basic Web service that uses the HTTP transport protocol, you are implementing a classic request/response model in which the client issues a request and the service is expected to issue a direct response. In this scenario, it is unnecessary for the message to contain its own addressing information. But the need changes in other scenarios, such as a message that hops across multiple endpoints over the TCP transport protocol. WS-Addressing is not interesting in and of itself. It is a support specification for other important specifications such as WS-Reliable Messaging. Still, it is important to understand the WS-Addressing constructs and how they are written to a SOAP message. Without WSAddressing, it would not be possible for messages to travel anywhere other than within the well-established HTTP-based request/response model. Nor would it be impossible to write truly asynchronous Web service calls.
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CHAPTER 4: Other Sync Methods
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Although the term combining delegates might give the impression that the operand delegates are modified, they are not changed at all. In fact, delegates are immutable. After a delegate object is created, it cannot be changed. Figure 15-5 illustrates the results of the preceding code. Notice that the operand delegates remain unchanged.
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VS2010 adds a new option to the DataGrid control to allow you to easily define how columns and rows should be sized. This window will appear when you define columns and rows and then hover over it. The menu allows you to choose the following options: Fixed (e.g. 200), Star (* weighted proportion), or Auto (where the size is determined by the contents). See Figure 15-7.
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Now that you ve investigated the asynchronous login functionality, before you look into the rest of the functionality of Atlas, it s a good idea to create a real user. You do this by first clicking the Register tab of the Login pane (see Figure 7-14).
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Setting Up the Project Files
In addition, select the MenuItem control at the top of the design surface, and uncheck the IsTabStop property. If you compile and run the program now, you will see that the Tab key cycles between the top two TextBox controls and the Button.
virtual int CompareTo(Object^ obj) { if (!obj) return 1; // by definition, any object compares greater than nullptr Person^ person = dynamic_cast<Person^>(obj); if (!person) // Person object is expected throw gcnew ArgumentException("obj"); int res = name->CompareTo(person->name); if (res != 0) return res; return age.CompareTo(person->age); } }; If you want to prevent less-important functionality from polluting the public interface of a class, you can implement it as a protected or a private function. This means that a client can call the interface members only via an interface reference, not via a reference of the concrete object s type. To implement interface members with protected functions, the named overriding syntax must be used. public ref class Person : public IComparable { ... same as before ... protected: virtual int CompareTo(Object^ obj) = IComparable::CompareTo { ... same as before ... } }; A protected implementation allows a derived class to override the implementation of the interface member. A private implementation would not even allow that. To implement an interface with private members only, you have to use named overriding as in the sample before. To express that the function cannot be overridden in a derived class, you also have to use the keyword sealed in your overriding specifier. The following code shows an example: public ref class Person : public IComparable { ... same as before ... private: virtual int CompareTo(Object^ obj) sealed = IComparable::CompareTo { ... same as before ... } };
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