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Another important aspect with synchronization is reentrancy Reentrancy refers to when a single object is invoked multiple times by the same call flow Reentrancy is made possible by a causality-based lock An activity uses a causality-based lock Contrary to other Win32 API synchronization mechanisms, the causality lock does not use a physical thread, but a logical thread Causality locks have the advantage that synchronization with Enterprise Services does not hinder reentrancy Consider the scenario in Figure 3-9
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Figure 3-9 Activities and reentrancy
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This figure shows two objects with a callback Object A invokes methods in object C, and object C does a callback in object A Although it is not allowed for a second client thread to invoke a method in object A when the activity is running, the callback from object C is working without a problem because this call flow has the same causality ID
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Selecting the Synchronization Option
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So, what apartment and what activity should be selected for NET components The default apartment configuration with NET serviced component is Both, as shown and configured in the registry The configuration value Both means that any apartment (STA, MTA, or TNA) is accepted Usually this is an option you can live with If the application of the serviced component is configured as a server application, the component will run inside an MTA and can be accessed from different threads If the application is configured as a library application, the client defines the apartment to use The default apartment with ASPNET applications is the MTA With console or Windows applications, the apartment is defined by the attribute [STAThread] or [MTAThread], which is applied to the Main method If an STA is used, you have to pay special attention to synchronization in case you are using multiple threads The STA hinders the multiple threads that are using the serviced component, no matter how the activity is configured Using an STA for the serviced component is only a requirement if the component uses state that is bound to a single threadeg, thread local storage, or window handles What about the activity configuration For most cases, the option SynchronizationOptionRequired is the best choice This way you get synchronized access to the component If multiple threads should access the component concurrently, you should change this option to SynchronizationOptionNotSupported If you want synchronized access to the components, but the second component should be accessed concurrently with the first component that was used to create the second one, SynchronizationOptionRequiresNew might be the best optionas demonstrated in the synchronization example shown earlier
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TIP: Reality Check: Activities and Stateful Components
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If you pass object references for stateful components across method calls, you must pay attention to activities and reentrancy issues With stateless components, you do not have a reentrancy issue because a new object is used with [4] every method call Stateless components should be the preferred option because this increases scalability, and not [5] passing around object references makes the move to the follow-up technology Indigo easier
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Services Without Components
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Windows Server 2003 and Windows XP SP2 have a new feature with Enterprise Services: services without components This enables the use of activities and transactions directly inside a method without deriving the class from ServicedComponent Using this new feature, you can bind activities to a thread or create new contexts within a method To explain how activities without serviced components work, this section covers the following topics:
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ServiceDomain class ServiceConfig class Activity class Using a new activity Starting a new context
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With the ServiceDomain class, a code block can run in its own contextServiceDomain makes it possible to create a context that is independent of the context that it is currently run in ServiceDomain has just two static methods: Enter and Leave If Enter is used, a context is created that is defined by theServiceConfig object, which is passed to the method With Leave, the context is exited to return to the previous context
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