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must prefix all instances of a structure with the struct keyword, as in struct timeval GetTimeNow();. The clean way around this is by using the typedef keyword. From then on, you can use the name of a type without any mention of the struct or typedef keywords. This makes future code easier to read and write. An important issue to be aware of when writing portable code is naming conflicts. A common practice when using the typedef keyword is to give the new type a name that is the same but in all uppercase. The problem here is that on Windows, the name TIMEVAL has some other use. However, the name TIMEVALUE is unused on Linux, Windows, and Mac/iPhone systems.
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here are scenarios where an application requires the ability to undo changes made to an object. Data binding is one example because implementing the IEditableObject interface requires that an object be able to take a snapshot of its state, be edited, and then be able to return its state to that snapshot later. Another example is where the UI has a Cancel button that doesn t close the form or page, in which case the user expects that clicking Cancel will revert the form s data (and thus the business object) to a previous state. Implementing an undo feature is challenging, especially when you consider parent-child object relationships. When undoing changes to an Invoice object, for example, it is necessary to remove all newly added line items, re-add all removed line items, and undo all edited line items all that in addition to undoing changes to the Invoice object itself. It is important to remember that all child objects are part of the object s state. Of course, it is also important to follow good object-oriented programming (OOP) practices, and a key tenet of OOP is to preserve encapsulation. This means one object can t directly manipulate the state (fields) of another object. So the Invoice object can t directly manipulate the state of its LineItemList collection or the LineItem objects it contains. Instead, it must ask each of those objects to manage its own state individually. The undo functionality provided by CSLA .NET is n-level undo. This means that you can cause the object to take multiple snapshots of its state and then cancel or accept each level of changes: _customer.BeginEdit(); // take a snapshot _customer.Name = "ABC Corp"; _customer.BeginEdit(); // take a snapshot _customer.Name = "RDL Corp"; _customer.BeginEdit(); // take a snapshot _customer.Name = "XYZ Corp"; _customer.CancelEdit(); // undo to previous snapshot _customer.CancelEdit(); // undo to second snapshot _customer.ApplyEdit(); // keep first set of property changes The end result is that the Name property has the value of ABC Corp because the second two sets of property changes were discarded by calls to CancelEdit(). Not all applications use n levels of undo. In fact, most web applications don t use undo at all, and the implementation in CSLA .NET is designed so no overhead is incurred if the feature isn t used. Most WPF and Windows Forms applications use at least one level of undo because data binding uses the IEditableObject interface, which does take a snapshot of the object s state. If your WPF or Windows Forms interface also includes a Cancel button that doesn t close the form, you ll almost certainly use two levels of undo: one for IEditableObject and another for the form-level Cancel button. Some WPF and Windows Forms UI designs may use modal windows to allow editing of child objects. If you don t use in-place editing in a grid control, it is quite common to pop up a modal
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There are many techniques for resolving CBC latch contention. The following sections describe several that you should consider.
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OWNER SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME -------- ------------ ------------ --------------TESTUSER SYS_C0011456 INDEX USERS SQL> SELECT 2 TABLE_NAME 3 FROM 4 DBA_INDEXES 5 WHERE 6 OWNER = "TESTUSER" 7 AND INDEX_NAME = "SYS_C0011456"; TABLE_NAME ---------T5 The primary-key index on table T5 is the object causing session 3 to wait in the enq: TX row lock contention wait, because of a potential primary-key violation if session 2 issues a commit. For additional information, see Metalink Doc ID 62354.1, TX Transaction Locks Example Wait Scenarios ; Doc ID 33453.1, Referential Integrity and Locking ; and Doc ID 102925.1, Tracing Sessions: Waiting on an Enqueue. Kyle Hailey published a helpful presentation on the topic of enqueue waits (
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