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Tip of the Day
Language: Enterprise
Expertise: Intermediate
May 12, 2000

Share Data Across MTS Objects

One of the resource dispensers that come with MTS is Shared Property Manager (SPM). SPM provides a mechanism by which you can share global memory among all the objects that are running inside the same MTS process (or package or application). Using SPM, you can store a typical Name/Value dictionary. But before you can use SPM, you need to reference the Shared Property Manager Type Library (mtxspm.dll) in your MTS DLL project.

Here is a sample code: (The way this thing works is you first have to create SharedProperty Group Manager, which you use to create a SharedProperty Group. Using SharedProperty Group pointer you try to create SharedProperty. Both CreatePropertyGroup() and CreateProperty() take a boolean flag which gets set to true if the SharedProperty Group or SharedProperty existed previously.)

 Dim objContext As MTxAS.ObjectContext
Dim objSPGManager As MTxSpm.SharedPropertyGroupManager
Dim objSPGroup As MTxSpm.SharedPropertyGroup
Dim objSharedProperty As MTxSpm.SharedProperty
Dim blnGroupExists As Boolean
Dim blnPropExists As Boolean

' Get hold of object context
Set objContext = GetObjectContext()
' Create Shared property group manager
Set objSPGManager = 
objContext.CreateInstance("MTxSpm.SharedPropertyGroupManager.1")
' Try creating a new property group for storing properties
Set objSPGroup = objSPGManager.CreatePropertyGroup("MyGroup",
LockMethod, Process, blnGroupExists) ' If blnGroupExists is True then MyGroup already exists ' Try add property into the property group Set objSharedProperty = objSPGroup.CreateProperty("MyProperty",
blnExists) ' If blnExists is True then MyProperty already exists. If (blnExists) Then ' get value from the property vntPropertyValue = objSharedProperty.Value Else ' this is first time we are using property so ' get the value from registry or database and ' then store it in this property so that ' subsequent access is more efficient objSharedProperty.Value = vntPropertyValue End If
Deepak Pant
 
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