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In this chapter we covered workflows and how to host them in the cloud. We started with an example of a sequential workflow service and saw how easy it was to use in Azure. The workflow service was essentially the same as regular .NET workflow, with the exception that we could not use any codebehind files. Our second example provided a work-around to a limitation in the .NET Workflow service: namely that we can't deploy state machine or custom workflows to the cloud. Our example used HttpWebRequest to switch the states of a state machine workflow to demonstrate the work-around.f
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This application should provide some insight into how best to use the powerful networking capabilities of the iPhone together with the methods I have covered in this chapter to build your own multiplayer games. If you are unfamiliar with C, Objective-C, or both, then some of the topics covered here may be hard to grasp in their entirety at first, but if you can follow the majority of the methods explained in this chapter, there is not much more you need to know on the device side in order to get a multiplayer game up and running. The nature of networking means that when developing applications that rely on network or Internet communications, you must be sure that problems such as network outages, dropped or incomplete packets, or even slow transfer rates can be encountered without causing issues in your application. If you bear this in mind throughout development, making sure you have every situation covered, then you will no doubt end up with much more stable games that work regardless of the users connection quality.
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The last topic I d like to take a look at in this section concerns performance, but in a more subtle fashion. It has to do with statistics on encrypted columns. If you remember from the discussion on how column level encryption works, Oracle adds a SALT to the data, some random bytes of data, and pads out the resulting encrypted string to a fixed width string in multiples of 16 bytes. You can imagine that would have an impact on the statistics. We gather statistics on the existing data, and we store those statistics. Hence, the statistics are gathered on the encrypted data in those columns. This will have a definite impact on the query optimizer. Consider a simple query using equality against the non-encrypted and encrypted columns: ops$tkyte%ORA11GR2> set autotrace traceonly explain ops$tkyte%ORA11GR2> select * from t where non_encrypted = "ALL_OBJECTS"; Execution Plan ---------------------------------------------------------Plan hash value: 1601196873 -------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 2 | 184 | 240 (1)| 00:00:03 | |* 1 | TABLE ACCESS FULL| T | 2 | 184 | 240 (1)| 00:00:03 | -------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------1 - filter("NON_ENCRYPTED"="ALL_OBJECTS") ops$tkyte%ORA11GR2> select * from t where encrypted = "ALL_OBJECTS"; Execution Plan ---------------------------------------------------------Plan hash value: 1601196873 -------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 646 | 59432 | 241 (2)| 00:00:03 | |* 1 | TABLE ACCESS FULL| T | 646 | 59432 | 241 (2)| 00:00:03 | -------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------1 - filter(INTERNAL_FUNCTION("ENCRYPTED")="ALL_OBJECTS") ops$tkyte%ORA11GR2> set autotrace off Notice how the estimated cardinality goes from 2 rows to 646 rows as we change from using the NON_ENCRYPTED column to the ENCRYPTED column. This is a necessary side effect of encrypting this individual column and may have the effect of changing query plans. That is, the plans your queries used
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Figure 2-3. Class AddressTableService provides data IO services
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To avoid these naming conflicts, I recommend defining the P/Invoke function in a namespace or managed class, as shown here: namespace NativeFuncs { [System::Security::SuppressUnmanagedCodeSecurity] [System::Runtime::InteropServices::DllImport( "kernel32.dll", SetLastError=false)] void fNativeFromDll(DWORD frequency, DWORD duration); }; Writing a custom P/Invoke function in C++/CLI is often much easier than writing an equivalent function in other languages. Since native types can seamlessly be used in C++/CLI, you can simply copy the native function declaration and replace some native declaration aspects with equivalent managed aspects. As an example, have a look at the declaration of Beep in winbase.h: WINBASEAPI BOOL WINAPI Beep( __in DWORD dwFreq, __in DWORD dwDuration ); In this code, the macro WINBASEAPI evaluates to __declspec(dllimport). The managed equivalent of __declspec(dllimport) is the DllImportAttribute. Therefore, you must remove the WINBASEAPI macro and apply the DllImportAttribute instead. The WINAPI macro evaluates to __stdcall. It is used to specify the calling convention of Beep. Instead of using this native calling convention, your P/Invoke function must apply the DllImportAttribute as shown here: namespace Win32Native { using namespace System::Runtime::InteropServices; [System::Security::SuppressUnmanagedCodeSecurity] [DllImport("kernel32.dll", SetLastError=false, CallingConvention = CallingConvention::StdCall)] void Beep(DWORD frequency, DWORD duration); }; The default setting for the CallingConvention property of the DllImportAttribute is CallingConvention::WinApi. This setting is used to specify that the default calling convention of the platform s system APIs should be chosen. For the Win32 API, this is __stdcall. Since Beep is a function of the system API, it is also possible to keep this default setting instead of specifying CallingConvention = CallingConvention::StdCall.
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Therefore, prior to Oracle Database 11g, which has the easy to use V$DIAG_INFO view, in practice (assuming dedicated server mode) you need access to four views to determine your trace file name: V$PARAMETER, which is used t locate the trace file for user_dump_dest and to find the optional tracefile_identifier that might be used in your trace file name. V$PROCESS, which is used to find the process ID. V$SESSION, which is used to correctly identify your session s information in the other views. V$INSTANCE, which is used to get the ORACLE_SID.
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generic <typename T> public interface class IGInterface { property T InnerObject; };
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The other child tag for the UpdatePanel control is <Triggers>. This allows you to define triggers for the update. The UpdatePanel control has a mode property attribute, and if you set this to Conditional (the other option is Always), then updates to the rendering of the markup will occur only when a trigger is hit. This tag contains the collection of trigger definitions. Two types of trigger exist, defined next. Using ControlEventTrigger When using a ControlEventTrigger trigger type, you define a trigger that has an associated control (specified by ControlID) and an event name (specified by the EventName) on that control. If the event is raised on that control, then the trigger fires, and the UpdatePanel control will be rendered. You specify a ControlEventTrigger with the <atlas:ControlEventTrigger> tag. Here s an example: <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblResult" runat="server" Text="Label"> </asp:Label> <asp:Calendar ID="Calendar1" runat="server"> </asp:Calendar> </ContentTemplate> <Triggers> <atlas:ControlEventTrigger ControlID="btnAdd" EventName="Click" /> </Triggers> </atlas:UpdatePanel> Here the ControlEventTrigger specifies that the source for the trigger is the button called btnAdd, and the event on which to trigger is the Click event. Therefore, when the button is clicked, the ControlEventTrigger will fire, and the partial update will occur. Using ControlValueTrigger ControlValueTrigger defines a trigger that fires when the value of a property (specified by PropertyName) for the associated control (specified by ControlID) changes. Upon the change happening, the trigger fires, and the UpdatePanel control will be rendered during the partial
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model needs some work. Though relying on the aesthetics of a diagram may sound a bit odd, it is a good rule of thumb. In this case, there s a pretty complex relationship between Project, ProjectResources, Resource, and ResourceAssignments. It is, in fact, a circular relationship, in which all these objects refer to the other objects in an endless chain. In a situation like this, you should always be looking for a way to simplify the relationships. What you ll often find is that the object model is missing a class: one that doesn t necessarily flow directly from the use cases but is required to make the object model workable. The specific problem caused by the circular relationship in Figure 3-3 becomes apparent when an object is to be loaded from the database. At that time, it will typically also load any child objects it contains. With an endless loop of relationships, that poses a rather obvious problem. There must be some way to short-circuit the process, and the best way to do this is to introduce another object into the mix. In the object model thus far, what s missing is a class that actually represents the assignment of a resource to a project. At this point, there s no object responsible for assigning a resource to a project, so an entire behavior from the use cases is missing in the object model. Additionally, data described in the use cases isn t yet reflected in the object model, such as the role of a resource on a particular project or the date that the resource was assigned to a project. These data fields can t be kept in the Project object, because a project will have many resources filling many different roles at different times. Similarly, they can t be kept in the Resource object, because a resource may be assigned to many projects at different times and in different roles.
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Figure 1-16. Using a business object to centralize business logic
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// Generic interface
Figure 1-2. Visual Studio Worker Cloud Service template 2. Visual Studio will generate two projects for this solution by default. Add a reference to StorageClient.dll to the project. This assembly can be found from the bin directory where the Azure SDK was installed, for example, C:\Program Files\Windows Azure SDK\v1.0\Samples\StorageClient\Lib\ bin\Debug as Figure 1-3 shows.
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