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Figure 31-12 The Pooling & Recycling tab in a COM+ application s Properties window
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Application pooling provides a way to improve isolation among components: if a com ponent crashes, only the DllHost instance that hosts the component is shut down; clients served by the other instances aren t affected. Application pooling is also useful for legacy single-threaded COM components. All such components are created in the main SingleThread Apartment (STA) of a given process, which tends to negatively affect perfor mance. Creating multiple hosting processes can reduce this performance penalty. Application pooling has a few limitations too. For example, a COM+ application that runs as an NT service can t use application pooling. Also, you can t use the Shared Property Manager (SPM) to share data among all the instances of a given component because the SPM can t span multiple processes. In general, you should never assume that two instances of a given component run in the same process. (Read the MSDN documentation for more information about the SPM.) When you shut down a pooled application from the MMC snap-in, COM+ terminates all the DllHost instances that are serving that application. Similarly, when you manually start a pooled application from the snap-in, COM+ creates a number of processes equal to the pool size. (Conversely, when the application is started by a client request, only one process is initially created.)
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One recurring complaint from developers (and end users) is that COM+ applications have a tendency to degrade performance in the long run. In many cases, the blame belongs to the developers themselves as this performance degradation is typically caused by bugs, memory leaks, or unreleased resources but this surely doesn t help solve the problem.
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31:
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COM+ 1.5 supports automatic application recycling, which you define in the same tab you use for application pooling. (See Figure 31-12.) You can decide to recycle the application after a given number of minutes (the Lifetime Limit field in the user interface), when a given amount of virtual memory is exceeded for longer than 1 minute (the Memory Limit field), after a specified number of method calls (the Call Limit field), or after a specified number of activations (the Activation Limit field). When one of these limits is exceeded, COM+ waits for existing objects to complete their job and then shuts down the application. If not all objects have completed their tasks within the number of minutes specified in the Expiration Timeout field, COM+ shuts down the application on the assumption that these objects have entered an endless loop or that their clients haven t correctly released their references. As soon as the Expiration Timeout period starts, COM+ creates a new DllHost process that serves incoming requests from clients while the original process is waiting for existing objects to complete their tasks. This mechanism ensures that clients won t notice any delay while the application is being recycled. If you have enabled recycling for a pooled application, COM+ spreads shutdowns evenly over time, in an attempt to avoid situations in which two or more applications are recycling at the same time. An application marked for recycling ignores the Leave Running When Idle setting on the Advanced tab of the application s Properties window. Because recycling affects the lifetime of the DllHost process, you can use it only for COM+ server applications, and only for applications that aren t configured to run as NT services. (See the next sec tion.) You can also manually recycle an application by right-clicking the application icon under the Running Processes folder in the MMC snap-in.
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In a welcome improvement from the first version of COM+, you can configure a COM+ 1.5 server application to run as an NT service. Even better, you don t have to change your source code to activate this feature; you just need to select the Run Application As NT Service check box on the Activation tab of the application s Properties window. (See the left portion of Figure 31-13.) In most cases, you should click the Setup New Service button to create and configure the new service. Clicking this button displays the dialog box shown in the right portion of Figure 31-13. If you set the Startup Type to Automatic. the service will start when the computer completes the bootstrap sequence; however, setting the Startup Type to Manual doesn t mean that you have to activate it manually, because COM+ will auto matically activate the service when the first activation requests comes from a client. (The only disadvantage in setting Startup Type to Manual is that the first client will have to wait until COM+ launches the service.)
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Part VII:
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