crystal reports 2011 qr code ENTERPRISE SERVICES in C#

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CHAPTER 7 ENTERPRISE SERVICES
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Figure 7-5. With JITA, each iteration of the loop is actually calling a new instance of the service object. The goal of JITA is to optimize the efficiency of stateless components. Since classes designed to be used within COM+ should generally be stateless, JITA has broad applicability in this environment. Enabling this feature removes control of the object lifetime from the client, and puts the server component in control of its own lifetime. This is going to increase scalability if you have clients that are holding references to your components, even when they should be creating instances late and releasing them as soon as possible (a best practice in distributed, stateless programming environments). It could be argued then, that if your client is stateless (like it is when the client is an ASP.NET web application), JITA is not needed because the lifetime will only ever last as long as the lifetime of the Web Form holding the reference. This is theoretically true, but even if your client is stateless, enabling JITA can guard against bad coding practices, like putting a reference to a COM+ component into the ASP .NET web cache. In larger environments where you may not necessarily be in a position to review the code that s consuming your components, JITA can still be worthwhile. The only time JITA should not be considered is when your component is maintaining state information across method calls. When this is necessary, the lifetime of the component must be managed by the client, and JITA-enabling this component will cause the state information to be lost. We ll be looking at COM+ transactions in a following section. It s worth noting that enabling transactions on your type automatically causes it to be JITA-enabled.
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A pool of objects increases the scalability of an application by avoiding expensive object instantiation and destruction overhead, and it is able to service the requests of many times more clients than can be served with an instance per client. Coupling pools with JITA can dramatically increase the load your application can withstand. A pool is nothing more than a number of active instances of a type that COM+ maintains in memory, and then dynamically allocates as clients request instances of the type. With JITA configured, these allocations occur on a per method call basis. When the method is finished executing, the instance is returned to the pool to service the next request. Not only are instances of the type more readily available, but also precious resources are saved by not instantiating an instance per client reference, and by avoiding the expensive process of allocating additional blocks of memory to hold the instance.
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For this to work, the object must be stateless. Any field-level information designed to be maintained across method calls will not necessarily be maintained. These types must be entirely autonomous at the method level. They need to accept all of the parameters required to do their work, do the work within the method call, and release any resources used to do the work before returning results to the caller. Pooling behavior is controlled with the ObjectPooling attribute, seen as follows. (You can find this class in the Serviced project of the Code07 solution.) [ObjectPooling(5, 500)] public class Poolable : ServicedComponent { public DataSet GetSomeData(string sql) { SqlConnection cn = new SqlConnection(ConnStr); SqlCommand cm = new SqlCommand(sql, cn); DataSet ds = new DataSet(); new SqlDataAdapter(cm).Fill(ds); return ds; } protected override CanBePooled() { return true; } } The ObjectPooling attribute controls the default configuration of the component when it s registered with COM+ (see Figure 7-6). As objects are deactivated, the COM+ runtime calls the CanBePooled method to verify that it has permission to return the instance to the pool. This method returns false from the base class, so you need to override it and return true in order to get instances into the pool. Pooling should always be used in combination with JITA, for highly available instances that are returned to the pool after each method completes. [ObjectPooling(5, 500)] [JustInTimeActivation(true)] public class Poolable : ServicedComponent { public DataSet GetSomeData(string sql) { SqlConnection cn = new SqlConnection(ConnStr); SqlCommand cm = new SqlCommand(sql, cn); DataSet ds = new DataSet(); cn.Open(); new SqlDataAdapter(cm).Fill(ds); cn.Close();
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