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calling Activator.getObject() calling getPatientInfo() [53] created [53] getPatientInfo() invoked
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ID of the patient: 42 calling getPatientInfo()
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[53] getPatientInfo() invoked ID of the patient: 42
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As you can see, only one instance is created on the server, even for multiple subsequent requests. If the lease time expires, the instance is
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Server-activated instances
discarded. When a new invocation arrives, a new instance is created that will handle all requests until its own lease expires. If you want to avoid this behavior, you must ensure that the instance lives forever. To do this, you have to return null in InitializeLifetimeService of the particular remote object type. This is typically done in case of STATIC INSTANCES:
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public class PatientManager: MarshalByRefObject, IPatientManager { // all other operations as before public override object InitializeLifetimeService() { return null; } }
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Client-dependent instances and Leasing on page 208 provides more details about InitializeLifetimeService and leasing. A more interesting situation occurs, however, when two clients concurrently call the PatientManager on the same server application. This situation is shown in the following diagram. Note that, since the two events happen at almost the same time, the two arrows almost overlap.
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calling Activator.getObject() [53] created calling Activator.getObject() calling getPatientInfo() ID of the patient: 42 calling getPatientInfo() calling getPatientInfo() ID of the patient: 42 ID of the patient: 42 [53] getPatientInfo() [53] getinvoked PatientInfo() invoked calling getPatientInfo() ID of the patient: 42 [53] get[53] getPatientInfo() PatientInfo() invoked invoked
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In this situation, the operation is invoked from within several threads (as illustrated by the two object lifelines of the server), but on the same instance. The constructor is called only once. Here, thread-safe
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.NET Remoting Technology Projection programming is required as soon as shared resources require coordinated access from within the remote object. The lifetime of the instances We first have to define what we mean by lifetime of instances . There are two different lifetimes for remote objects: One is the time the class s instance exists, that is, the time during which the object is managed by the .NET runtime, independent of the Remoting framework. The other lifetime is the duration during which the instance is managed by the Remoting framework and is remotely accessible. Depending on the activation mode, the object either physically exists first and is then managed by the Remoting framework (as in case of STATIC INSTANCES), or the remote object type is managed by the framework first (with no instances yet in existence), and instances are created on demand, as in case of LAZY ACQUISITION, PER-REQUEST INSTANCES and CLIENT-DEPENDENT INSTANCES. In the context of this section, we are mainly interested in the time during which an object is managed by the Remoting framework. Let s look at the different activation modes: In the case of a PER-REQUEST INSTANCE, the situation is fairly simple: the instance is created on request and immediately released after the invocation. Eventually the object is garbagecollected by the .NET runtime. In the other cases the object lives on until its lease expires. It is then discarded by the Remoting framework and eventually garbage collected. Usually you should ensure that the instance lives forever by returning null in InitializeLifetimeService. We will look into LEASING in more detail later when we discuss CLIENT-DEPENDENT INSTANCES. The following diagram illustrates this discussion. It shows the lifetime of the remote object (above the dotted line) and the lifetime of actual
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LAZY ACQUISITION STATIC INSTANCE PER-REQUEST INSTANCE RegisterWellKnownServiceType() called RegisterWellKnownServiceType() called an instance is created Client invokes an operation Client invokes an operation Client invokes an operation instance is created Marshal() is called Client invokes an operation Client invokes an operation Lease expires an instance is created Client invokes an operation Client invokes an operation Client invokes an operation garbage collected ... No further local references Lease expires