ObjectPoolingAttribute Class

Definition

Enables and configures object pooling for a component. This class cannot be inherited.

C#
[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(false)]
public sealed class ObjectPoolingAttribute : Attribute
Inheritance
ObjectPoolingAttribute
Attributes

Examples

The following code example demonstrates the use of this attribute.

C#
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);
    }
}

Remarks

If object pooling is specified, it must not be disabled in the COM+ catalog; if enabled in the COM+ catalog, it must be specified on the component.

For a list of initial property values for an instance of ObjectPoolingAttribute, see the ObjectPoolingAttribute constructor.

For more information about using attributes, see Attributes.

Constructors

ObjectPoolingAttribute()

Initializes a new instance of the ObjectPoolingAttribute class and sets the Enabled, MaxPoolSize, MinPoolSize, and CreationTimeout properties to their default values.

ObjectPoolingAttribute(Boolean, Int32, Int32)

Initializes a new instance of the ObjectPoolingAttribute class and sets the Enabled, MaxPoolSize, and MinPoolSize properties.

ObjectPoolingAttribute(Boolean)

Initializes a new instance of the ObjectPoolingAttribute class and sets the Enabled property.

ObjectPoolingAttribute(Int32, Int32)

Initializes a new instance of the ObjectPoolingAttribute class and sets the MaxPoolSize and MinPoolSize properties.

Properties

CreationTimeout

Gets or sets the length of time to wait for an object to become available in the pool before throwing an exception. This value is in milliseconds.

Enabled

Gets or sets a value that indicates whether object pooling is enabled.

MaxPoolSize

Gets or sets the value for the maximum size of the pool.

MinPoolSize

Gets or sets the value for the minimum size of the pool.

TypeId

When implemented in a derived class, gets a unique identifier for this Attribute.

(Inherited from Attribute)

Methods

AfterSaveChanges(Hashtable)

Called internally by the .NET Framework infrastructure while installing and configuring assemblies in the COM+ catalog.

Apply(Hashtable)

Called internally by the .NET Framework infrastructure while applying the ObjectPoolingAttribute class attribute to a serviced component.

Equals(Object)

Returns a value that indicates whether this instance is equal to a specified object.

(Inherited from Attribute)
GetHashCode()

Returns the hash code for this instance.

(Inherited from Attribute)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
IsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(Inherited from Attribute)
IsValidTarget(String)

Called internally by the .NET Framework infrastructure while installing and configuring assemblies in the COM+ catalog.

Match(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(Inherited from Attribute)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.

(Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.

(Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.

(Inherited from Attribute)

Applies to

Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1