Microsoft Windows NT 4.0 Guide Manual de usuario descargar pdf (Pagina 135)

Microsoft

Windows Server

™

2003 White Paper

Windows NT 4.0 Server Upgrade Guide 130

COM+ 1.5

Component services continue to be a fundamental application platform for many applications and

developers. COM+ 1.5 is included in Windows Server 2003 and introduces many new features.

This section provides a quick overview of key new features in COM+ 1.5 to be aware of when

upgrading from Windows NT Server 4.0.

COM+ can be used to develop enterprise-wide, mission-critical, distributed applications based on

the Windows platform. COM+ builds on and extends applications written using COM, MTS, and

other COM-based technologies. COM+ handles many of the resource management tasks that

developers previously had to program, such as thread allocation and security.

The new COM+ 1.5 features are not available in earlier platforms, such as Windows 2000, which

supports COM+ 1.0. However, COM+ 1.5 applications are still serviced by the Dllhost.exe process

for out-of-process applications (also known as server applications) and are contained in the

caller’s process for in-process applications (also know as library applications).

Feature Changes from Previous Releases

The Component Services administrative tool includes the following new features:

• COM+ application security. You can now configure the software restriction policy for your COM+

applications either by using the Component Services administrative tool or programmatically. The

software restriction policy was created to help protect systems from unknown and possibly

dangerous code and provides a mechanism where only trusted code is given unrestricted access

to a user's privileges.

• COM+ Queued Components. In COM+ 1.0, you set the maximum number of threads for COM+

Queued Components messages by using a registry key. This setting was applied computer-wide,

and each application used the same setting. However, now you can set a different maximum

number of threads for each application.

• Registry key change. COM+ no longer reads the registry key

HKLM\Software\Microsoft\COM3\Debug\QCListenerMaxThread.

New Features in COM+

Feature Description

Application

pooling

The new COM+ application pooling service adds scalability for single-threaded

processes and integrates with the new COM+ application recycling service.

Application

recycling

Application performance can degrade over time because of application problems such

as memory leaks, non-scalable resource usage, and process failures. The COM+

application recycling service enables you to shut down an application automatically

and restart it, thus reinitializing a failing process and reallocating memory it uses.

COM+

partitions

COM+ 1.5 introduces support for partitions, a feature that allows multiple

configurations of COM+ applications to run simultaneously on the same computer.

This feature can save you the cost and time-consuming effort of using multiple

servers to manage different configurations of an application. For example, you can

create a test and a development configuration of a COM+ application.

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