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icacheprovider-gettracecontext-method.md

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ICacheProvider::GetTraceContext Method
Describes the ICacheProvider::GetTraceContext method and details its syntax, parameters, return value, remarks, code example, and requirements.
10/07/2016
82947c97-727f-455e-b773-9fa952194dc3

ICacheProvider::GetTraceContext Method

Returns the trace context for the cache provider.

Syntax

virtual IHttpTraceContext* GetTraceContext(  
   VOID  
) const = 0;

Parameters

This method takes no parameters.

Return Value

An IHttpTraceContext pointer.

Remarks

CGlobalModule derived classes that register for GL_CACHE_OPERATION events receive an ICacheProvider pointer as a parameter on the CGlobalModule::OnGlobalCacheOperationvirtual method. You can retrieve an IHttpTraceContext pointer by calling the GetTraceContext method on the ICacheProvider pointer.

Notes for Implementers

ICacheProvider implementers are responsible for memory management with this data; therefore, ICacheProvider implementers that use dynamic memory allocation must release or call delete on the IHttpTraceContext pointer when it is no longer needed.

Notes for Callers

ICacheProvider implementers are responsible for memory management with this data; therefore, ICacheProvider clients must not release or call delete on the returned IHttpTraceContext pointer when this data is no longer needed.

Example

The following code example demonstrates how to create a global module that listens for GL_CACHE_OPERATION and GL_CACHE_CLEANUP events and then writes the IHttpTraceContext information to the Event Viewer.

Caution

[!INCLUDEiisver] generates a large number of events in the Event Viewer. To avoid a log overflow error in a production environment, you should generally avoid writing cache information to the event log. For demonstration purposes, this code example writes an entry to the Event Viewer in debug mode only.

[!code-cppICacheProvider#5]

For more information on how to create and deploy a native DLL module, see Walkthrough: Creating a Request-Level HTTP Module By Using Native Code.

The above code writes a new event to the application log of the Event Viewer, where the Data box contains XML similar to the following.

<cacheProvider>  
    <traceContext   
        activityId=  
           "{00000000-0000-0000-2400-0080000000FB}">  
        <traceConfiguration   
            providerGuid="NULL"   
            areas="0"   
            verbosity="0"   
            providerEnabled="false"/>  
    </traceContext>  
</cacheProvider>

You can optionally compile the code by using the __stdcall (/Gz) calling convention instead of explicitly declaring the calling convention for each function.

Requirements

Type Description
Client - IIS 7.0 on [!INCLUDEwinvista]
- IIS 7.5 on Windows 7
- IIS 8.0 on Windows 8
- IIS 10.0 on Windows 10
Server - IIS 7.0 on [!INCLUDEwinsrv2008]
- IIS 7.5 on Windows Server 2008 R2
- IIS 8.0 on Windows Server 2012
- IIS 8.5 on Windows Server 2012 R2
- IIS 10.0 on Windows Server 2016
Product - IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0
- [!INCLUDEiisexp75], [!INCLUDEiisexp80], [!INCLUDEiisexp100]
Header Httpserv.h

See Also

ICacheProvider Interface