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JustInTimeActivationAttribute Class

Turns just-in-time (JIT) activation on or off. This class cannot be inherited.

Namespace: System.EnterpriseServices
Assembly: System.EnterpriseServices (in system.enterpriseservices.dll)

[AttributeUsageAttribute(AttributeTargets.Class, Inherited=true)] 
[ComVisibleAttribute(false)] 
public sealed class JustInTimeActivationAttribute : Attribute
/** @attribute AttributeUsageAttribute(AttributeTargets.Class, Inherited=true) */ 
/** @attribute ComVisibleAttribute(false) */ 
public final class JustInTimeActivationAttribute extends Attribute
AttributeUsageAttribute(AttributeTargets.Class, Inherited=true) 
ComVisibleAttribute(false) 
public final class JustInTimeActivationAttribute extends Attribute

If JIT activation is specified, then it must not be disabled in the COM+ catalog, and vice versa. If enabled in the COM+ catalog, it must be specified on the component.

JIT activation defaults to off for components which are configured in COM+, but is enabled automatically if automatic transactions are requested.

For more information about using attributes, see Extending Metadata Using Attributes.

The following code example demonstrates the use of this attribute.

using System;
using System.EnterpriseServices;
using System.Windows.Forms;

[assembly: ApplicationName("ObjectInspector")]
[assembly: ApplicationActivation(ActivationOption.Server)]
[assembly: System.Reflection.AssemblyKeyFile("Inspector.snk")]

[JustInTimeActivation]
[ObjectPooling(MinPoolSize=2, MaxPoolSize=100, CreationTimeout=1000)]
public class ObjectInspector : ServicedComponent
{

    public string IdentifyObject (Object obj)
    {
        // Return this object to the pool after use.
        ContextUtil.DeactivateOnReturn = true;

        // Get the supplied object's type.        
        Type objType = obj.GetType();
        
        // Return its name.
        return(objType.FullName);

    }

    protected override void Activate()
    {
        MessageBox.Show( String.Format("Now entering...\nApplication: {0}\nInstance: {1}\nContext: {2}\n",
                                       ContextUtil.ApplicationId.ToString(), ContextUtil.ApplicationInstanceId.ToString(),
                                       ContextUtil.ContextId.ToString() ) );
    }

    protected override void Deactivate()
    {
        MessageBox.Show("Bye Bye!");
    }

    // This object can be pooled.
    protected override bool CanBePooled()
    {
        return(true);
    }

}

import System.*;
import System.EnterpriseServices.*;
import System.Windows.Forms.*;

/** @assembly ApplicationName("ObjectInspector")
 */
/** @assembly ApplicationActivation(ActivationOption.Server)
 */
/** @assembly System.Reflection.AssemblyKeyFile("Inspector.snk")
 */

/** @attribute JustInTimeActivation()
 */
/** @attribute ObjectPooling(MinPoolSize = 2, MaxPoolSize = 100, 
    CreationTimeout = 1000)
 */
public class ObjectInspector extends ServicedComponent
{
    public String IdentifyObject(Object obj)
    {
        // Return this object to the pool after use.
        ContextUtil.set_DeactivateOnReturn(true);
        // Get the supplied object's type.        
        Type objType = obj.GetType();
        // Return its name.
        return objType.get_FullName();
    } //IdentifyObject

    protected void Activate()
    {
        MessageBox.Show(String.Format("Now entering...\nApplication: {0}\n"
            + "Instance: {1}\nContext: {2}\n",
            ContextUtil.get_ApplicationId().ToString(),
            ContextUtil.get_ApplicationInstanceId().ToString(),
            ContextUtil.get_ContextId().ToString()));
    } //Activate

    protected void Deactivate()
    {
        MessageBox.Show("Bye Bye!");
    } //Deactivate

    // This object can be pooled.
    protected boolean CanBePooled()
    {
        return true;
    } //CanBePooled
} //ObjectInspector 

System.Object
   System.Attribute
    System.EnterpriseServices.JustInTimeActivationAttribute

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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