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Making this happen means keeping track of whether the user added or removed an object directly in the original collection or through the view. The view needs to know whether the change was initiated locally, on the view, or not. This is tracked by the mInitiatedLocally field, which is set to True before SortedBindingList performs any add or remove operations on the original collection, and is set to False when it is done. Adding and removing items to and from the view is done through the AddNew(), Insert(), and RemoveAt() methods. AddNew() and RemoveAt() are handled in a similar manner: Public Function AddNew() As Object _ Implements System.ComponentModel.IBindingList.AddNew Dim result As Object If mSupportsBinding Then mInitiatedLocally = True result = mBindingList.AddNew mInitiatedLocally = False OnListChanged(New ListChangedEventArgs( _ ListChangedType.ItemAdded, mBindingList.Count - 1)) Else result = Nothing End If Return result End Function Public Sub RemoveAt(ByVal index As Integer) _ Implements System.Collections.IList.RemoveAt, _ System.Collections.Generic.IList(Of T).RemoveAt If mSorted Then mInitiatedLocally = True Dim baseIndex As Integer = OriginalIndex(index) ' remove the item from the source list mList.RemoveAt(baseIndex) ' delete the corresponding value in the sort index mSortIndex.RemoveAt(index) ' now fix up all index pointers in the sort index For Each item As ListItem In mSortIndex If item.BaseIndex > baseIndex Then item.BaseIndex -= 1 End If Next OnListChanged( _ New ListChangedEventArgs(ListChangedType.ItemDeleted, index)) mInitiatedLocally = False Else mList.RemoveAt(index) End If End Sub Remember that mBindingList is a reference to the original collection object s implementation of the IBindingList interface. So this code merely sets mInitiatedLocally to True and then delegates the AddNew() call to the original collection. Similarly, the RemoveAt() call is delegated to the original collection through its IList(Of T) interface.

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This method of reading and writing to and from servers is acceptable for some situations, but it is fundamentally flawed for responsive gaming. The main problem with NSString s stringWithContentsOfURL: is that it loads the content of the URL synchronously, meaning that it blocks the current program loop until it finishes loading. This is clearly not ideal, because your application will stop responding for the duration of URL request, which itself can take some time to complete. In order to run nonblocking, or asynchronous, URL requests, you can use NSURLConnection class methods. When using NSURLConnection to make URL requests, the actual request is handled in the background, allowing the rest of the program to continue running. When data is obtained, or even when the request fails, a chosen delegate object is notified to handle the data. Listing 8-2 shows a method that initiates the retrieval of information from a web page (here a simple PHP page, score.php) using NSURLConnection. Listing 8-3 shows the associated delegate methods.

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9 PARTITION part_2 VALUES LESS THAN(3) tablespace p2 10 ) 11 / Table created. We then create both a local prefixed index, LOCAL_PREFIXED, and a local nonprefixed index, LOCAL_NONPREFIXED. Note that the nonprefixed index does not have A on the leading edge of its definition, which is what makes it a nonprefixed index: ops$tkyte@ORA11GR2> create index local_prefixed on partitioned_table (a,b) local; Index created. ops$tkyte@ORA11GR2> create index local_nonprefixed on partitioned_table (b) local; Index created. Next, we ll insert some data into one partition and gather statistics: ops$tkyte@ORA11GR2> insert into partitioned_table 2 select mod(rownum-1,2)+1, rownum, "x" 3 from all_objects; 72771 rows created. ops$tkyte@ORA11GR2> begin 2 dbms_stats.gather_table_stats 3 ( user, 4 "PARTITIONED_TABLE", 5 cascade=>TRUE ); 6 end; 7 / PL/SQL procedure successfully completed. We take tablespace P2 offline, which contains the PART_2 partition for both the tables and indexes: ops$tkyte@ORA11GR2> alter tablespace p2 offline; Tablespace altered. Taking tablespace P2 offline will prevent Oracle from accessing those specific index partitions. It will be as if we had suffered media failure, causing them to become unavailable. Now we ll query the table to see what index partitions are needed by different queries. This first query is written to permit the use of the local prefixed index: ops$tkyte@ORA11GR2> select * from partitioned_table where a = 1 and b = 1; A B DATA ---------- ---------- -------------------1 1 x This query succeeded, and we can see why by reviewing the explain plan. We ll use the built-in package DBMS_XPLAN to see what partitions this query accesses. The PSTART (partition start) and PSTOP (partition stop) columns in the output show us exactly what partitions this query needs to have online and available in order to succeed:

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