IHttpCacheKey Interface
Provides key information for corresponding data that is stored in a global cache.
Syntax
class IHttpCacheKey
Methods
| Topic | Description |
|---|---|
| Enum | Enumerates an IHttpCacheSpecificData pointer. |
| GetCacheName | Returns the unique name of the cache where a GL_CACHE_OPERATION event has occurred. |
| GetHash | Returns the unique hash code of an item in the global cache. |
| GetIsEqual | Returns a value indicating whether two IHttpCacheKey pointers are equivalent. |
| GetIsPrefix | Returns a value indicating whether two IHttpCacheKey pointers have the same prefix. |
Derived Classes
| Name | Description |
|---|---|
| IFileKey | Represents key information for accessing associated data in the global file cache. |
| IHttpTokenKey | Represents key information for accessing associated data in the global token cache. |
| IUriKey | Represents key information for accessing associated data in the Uniform Resource Identifier (URI) cache. |
Remarks
You can retrieve an IHttpCacheKey pointer from an ICacheProvider pointer by calling the ICacheProvider::GetCacheKey method.
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 IHttpCacheKey information to the Event Viewer.
Warning
IIS 7 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.
#pragma warning( disable : 4290 )
#pragma warning( disable : 4530 )
#define _WINSOCKAPI_
#include <windows.h>
#include <sal.h>
#include <tchar.h>
#include <initguid.h>
#include <httptrace.h>
#include <httpserv.h>
#include <httpcach.h>
#include <string>
using namespace std;
#import "msxml6.dll"
using namespace MSXML2;
// The CConvert class mirrors the Convert class that is
// defined in the .NET Framework. It converts primitives
// and other data types to wstring types.
class CConvert
{
public:
// The ToString method converts a HANDLE to a wstring.
// h: the HANDLE to convert to a wstring.
// return: the HANDLE as a wstring.
static wstring ToString(HANDLE h)
{
// If the HANDLE is NULL, return the "NULL" string.
if (NULL == h)
{
return L"NULL";
}
// If the HANDLE is not valid, return
// the INVALID_HANDLE_VALUE as a string.
if (INVALID_HANDLE_VALUE == h)
{
return L"INVALID_HANDLE_VALUE";
}
// The HANDLE is valid.
return L"valid";
}
// The ToString method converts a FILETIME pointer to a wstring.
// fileTime: the FILETIME pointer to convert to a wstring.
// return: the FILETIME pointer as a wstring.
static wstring ToString(FILETIME* fileTime)
{
// If fileTime is NULL, return the empty string.
if (NULL == fileTime)
{
return L"NULL";
}
// Convert the FILETIME to a local time, and
// then convert that local time to a wstring.
SYSTEMTIME stUTC;
SYSTEMTIME stLocal;
FileTimeToSystemTime(fileTime, &stUTC);
SystemTimeToTzSpecificLocalTime(NULL, &stUTC, &stLocal);
// Create a wstring to return. Note: wsprintf
// can be also used. However, it is more difficult
// to handle both UNICODE and non-UNICODE correctly.
wstring timeString =
ToString(stLocal.wMonth) +
wstring(L"/") +
ToString(stLocal.wDay) +
wstring(L"/") +
ToString(stLocal.wYear) +
wstring(L" ") +
ToString(stLocal.wHour) +
wstring(L":") +
ToString(stLocal.wMinute);
// Return the FILETIME data as a wstring.
return timeString;
}
// The ToString method converts a
// ULARGE_INTEGER pointer to a wstring.
// ui: the ULARGE_INTEGER pointer to convert to a string.
// return: the ULARGE_INTEGER pointer as a string.
static wstring ToString(ULARGE_INTEGER* ui)
{
// Return the empty string if the
// ULARGE_INTEGER pointer is NULL.
if (NULL == ui)
{
return L"NULL";
}
// Return the low-order part to a wstring.
return (ToString(ui->LowPart));
}
// The ToString method converts a PCSTR to a wstring.
// pcstr: the PCSTR to convert to a wstring.
// return: the PCSTR as a wstring.
static wstring ToString(PCSTR pcstr)
{
// Return the empty string
// if the PCSTR is NULL.
if (NULL == pcstr)
{
return L"NULL";
}
// Get the length of the string to copy.
size_t length = strlen(pcstr);
// Create a new double-byte character
// array of length plus 1.
wchar_t* newText = new wchar_t[length+1];
// Copy the source into the sink string.
for (size_t i = 0; i < length; ++i)
{
newText[i] = pcstr[i];
}
// Terminate the string with the NULL character.
newText[length] = '\0';
// Get a wstring from the new double-byte string.
wstring wText = newText;
// Call delete on the newText pointer
// and set this pointer to NULL.
delete[] newText;
newText = NULL;
// Return the wstring copy.
return wText;
}
// The ToString method converts a long to a wstring.
// l: the long value to convert to a wstring.
// return: the long as a wstring.
static wstring ToString(long l)
{
WCHAR str[256];
str[0] = '\0';
_ltow_s(l, str, 256, 10);
return str;
}
// The ToString method converts a DWORD to a wstring.
// d: the DWORD value to convert to a wstring.
// return: the DWORD as a wstring.
static wstring ToString(DWORD d)
{
return ToString((long)d);
}
// The ToString method converts an LPCGUID to a wstring.
// guid: the LPCGUID value to convert to a wstring.
// return: The LPCGUID as a wstring; otherwise, L"" if
// guid is NULL.
static wstring ToString(LPCGUID guid)
{
// If the GUID is NULL, return the empty string.
if (NULL == guid)
{
return L"NULL";
}
// Create a WCHAR array to write the GUID to.
WCHAR guidString[256];
// Initialize the zero-based index of the
// guidString to the null-terminating character
// because the StringFromGUID2 may fail.
guidString[0] = '\0';
// Convert the GUID to a string of the form "{...}".
int characters = StringFromGUID2(*guid, guidString, 256);
// Return the guidString as a wstring.
return guidString;
}
// The ToString method converts a BOOL to a wstring.
// b: the BOOL value to convert to a wstring.
// return: L"true" for true; otherwise, L"false" for false.
static wstring ToString(BOOL b)
{
return (b) ? L"true" : L"false";
}
// The ToByteString converts a double-byte
// character string to a single-byte string.
// str: the double-byte string to convert.
// return: a single-byte string copied from str.
static string ToByteString(const wstring& str)
{
// Get the length of the
// double-byte string.
size_t length = str.length();
// Create a temporary char pointer.
char* byteChar = new char[length+1];
byteChar[0] = '\0';
// Copy the double-byte character string
// into the single-byte string.
size_t charsReturned = 0;
wcstombs_s(&charsReturned, byteChar,
length+1, str.c_str(), length+1);
// Create a string to return.
string retString = byteChar;
// Delete the temporary string and
// set that string to NULL.
delete[] byteChar;
byteChar = NULL;
// Return the single-byte string.
return retString;
}
// The ToString method converts a USHORT to a wstring.
// u: the USHORT value to convert to a wstring.
// return: the value of u as a wstring.
static wstring ToString(USHORT u)
{
return (ToString((long)u));
}
// The ToString method converts a
// const BYTE pointer to a wstring.
// bytes: the BYTE pointer to convert.
// return: the value of bytes as a wstring.
static wstring ToString(const BYTE* bytes)
{
return (ToString((PCSTR)bytes));
}
// The ToString method converts
// a PCWSTR to a wstring.
// pcwstr: the PCWSTR to convert.
// return: L"NULL" if the pcwstr
// parameter is NULL; otherwise,
// pcwstr converted to a wstring.
static wstring ToString(PCWSTR pcwstr)
{
// If the pcwstr parameter
// is NULL, return L"NULL".
if (NULL == pcwstr)
{
return L"NULL";
}
// Implicitly convert the
// PCWSTR to a wstring.
return pcwstr;
}
// The ToString method converts
// a character to a wstring.
// c: the character to convert.
// return: c as a wstring.
static wstring ToString(char c)
{
wstring str;
str += c;
return str;
}
// The ToString method converts
// a short to a wstring.
// s: the short to convert.
// return: s as a wstring.
static wstring ToString(short s)
{
return (ToString((long)s));
}
};
// The CFilter class accepts all XML documents
// for writing. Classes that inherit from
// CFilter should override the Accept method.
class CFilter
{
public:
// Creates the CFilter class.
CFilter()
{
}
// Creates the Destructor for the
// CFilter class.
virtual ~CFilter()
{
}
// The Accept method returns true if the XML
// document should be written.
// doc: the XML document to write.
// return: true.
virtual bool Accept(MSXML2::IXMLDOMDocument3Ptr doc) const
{
return true;
}
};
// The CEventWriter class writes XML
// documents and strings to the event log.
class CEventWriter
{
public:
// Creates the CEventWriter class.
// name: the name of the
// event log to open.
CEventWriter(const wstring& name)
{
#ifdef UNICODE
m_eventLog = RegisterEventSource(NULL, name.c_str());
#else
string multiName = CConvert::ToByteString(name);
m_eventLog = RegisterEventSource(NULL, multiName.c_str());
#endif
}
// Creates the destructor for the
// CEventWriter class. This destructor
// closes the HANDLE to the event
// log if that HANDLE is open.
virtual ~CEventWriter()
{
// If the HANDLE to the event
// log is open, close it.
if (NULL != m_eventLog)
{
// Deregister the event log HANDLE.
DeregisterEventSource(m_eventLog);
// Set the HANDLE to NULL.
m_eventLog = NULL;
}
}
// The ReportInfo method writes the content
// of the XML document to the event log.
// doc: the XML document to write.
// return: true if the event log is written.
BOOL ReportInfo(MSXML2::IXMLDOMDocument3Ptr doc)
{
MSXML2::IXMLDOMElementPtr documentElement =
doc->documentElement;
// Get the XML as a BSTR and place this XML into a
// _bstr_t wrapper. The client of the XML document
// is responsible for deleting the returned BSTR from
// the property, which the _bstr_t wrapper will do
// automatically.
_bstr_t bstrXml = documentElement->xml;
// Convert the _bstr_t to a wstring.
wstring xmlString = bstrXml;
// Write the XML to the event writer.
return ReportInfo(xmlString);
}
// The ReportInfo method writes the content
// of the XML document to the event log if
// the filter parameter accepts the document.
// doc: the XML document to write.
// filter: the CFilter address for
// filtering XML documents.
// return: true if the event log is written.
BOOL ReportInfo(MSXML2::IXMLDOMDocument3Ptr doc, const CFilter& filter)
{
if (filter.Accept(doc))
{
return ReportInfo(doc);
}
return FALSE;
}
// The ReportInfo method writes
// a wstring to the event log.
// info: the wstring to write.
// return: true if the event log is written.
BOOL ReportInfo(const wstring& info)
{
return ReportEvent(EVENTLOG_INFORMATION_TYPE, info);
}
// The ReportError method writes
// a wstring to the event log.
// error: the wstring to write.
// return: true if the event log is written.
BOOL ReportError(const wstring& error)
{
return ReportEvent(EVENTLOG_ERROR_TYPE, error);
}
protected:
// The ReportEvent method accepts an event type
// and a wstring, and attempts to write that
// event to the event log.
// type: the type of the event.
// data: the wstring to write to the event log.
// return: true if the event log is written;
// otherwise, false.
BOOL ReportEvent(WORD type, const wstring& data)
{
// If the m_eventLog HANDLE
// is NULL, return false.
if (NULL == m_eventLog)
{
return FALSE;
}
#ifndef _DEBUG
// If the current build is not debug,
// return so the event log is not written.
return TRUE;
#endif
#ifdef UNICODE
// The unicode version of the ReportEvent
// method requires double-byte strings.
PCWSTR arr[1];
arr[0] = data.c_str();
return ::ReportEvent(m_eventLog,
type,
0, 0, NULL, 1,
0, arr, (void*)arr);
#else
// The non-unicode version of the ReportEvent
// method requires single-byte strings.
string multiByte =
CConvert::ToByteString(data);
LPCSTR arr[1];
arr[0] = multiByte.c_str();
return ::ReportEvent(m_eventLog,
type,
0, 0, NULL, 1,
0, arr, (void*)arr);
#endif
}
private:
// Specify the HANDLE to the
// event log for writing.
HANDLE m_eventLog;
};
// The CGlobalCacheModule class creates the CGlobalModule
// class and registers for GL_CACHE_OPERATION and
// GL_CACHE_CLEANUP events.
class CGlobalCacheModule : public CGlobalModule
{
public:
// Creates the destructor for the
// CGlobalCacheModule class.
virtual ~CGlobalCacheModule()
{
}
// The RegisterGlobalModule method creates and registers
// a new CGlobalCacheModule for GL_CACHE_OPERATION and
// GL_CACHE_CLEANUP events.
// dwServerVersion: the current server version.
// pModuleInfo: the current IHttpModuleRegistrationInfo pointer.
// pGlobalInfo: the current IHttpServer pointer.
// return: ERROR_NOT_ENOUGH_MEMORY if the heap is out of
// memory; otherwise, the value from the call to the
// SetGlobalNotifications method on the pModuleInfo pointer.
static HRESULT RegisterGlobalModule
(
DWORD dwServerVersion,
IHttpModuleRegistrationInfo* pModuleInfo,
IHttpServer* pGlobalInfo
)
{
// The pGlobalInfo parmeter must be non-NULL because
// the constructor for the CGlobalCacheModule class
// requires a non-NULL pointer to a valid IHttpServer
// pointer.
if (NULL == pGlobalInfo)
{
return E_INVALIDARG;
}
// Create a new CGlobalCacheModule pointer.
CGlobalCacheModule* traceModule =
new CGlobalCacheModule();
// Return an out-of-memory error if the traceModule
// is NULL after the call to the new operator.
if (NULL == traceModule)
{
return HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
}
// Attempt to set global notification for both
// GL_CACHE_OPERATION and GL_CACHE_CLEANUP events
// by using the traceModule as a listener.
HRESULT hr = pModuleInfo->SetGlobalNotifications
(traceModule, GL_CACHE_OPERATION | GL_CACHE_CLEANUP);
// If the SetGlobalNotifications method
// fails, return the HRESULT.
if (FAILED(hr))
{
return hr;
}
// Set the priority to PRIORITY_ALIAS_FIRST,
// which will populate the data as much as possible.
hr = pModuleInfo->SetPriorityForGlobalNotification(
GL_CACHE_OPERATION, PRIORITY_ALIAS_FIRST);
// Return the HRESULT from the call to
// the SetGlobalNotifications method.
return hr;
}
// The OnGlobalCacheOperation method is called
// when GL_CACHE_OPERATION operations occur.
// pProvider: the current ICacheProvider pointer.
// return: GL_NOTIFICATION_CONTINUE.
virtual GLOBAL_NOTIFICATION_STATUS OnGlobalCacheOperation
(
IN ICacheProvider* pProvider
)
{
// The OnGlobalCacheOperation must return if the
// pProvider parameter is NULL because this pointer
// is needed for data to write to the event log.
if (NULL == pProvider)
{
return GL_NOTIFICATION_CONTINUE;
}
// The following code uses COM smart pointers. Wrap
// the code in one try/catch statement for _com_error
// exceptions. Note: it is not necessary to call
// CoInitialize and CoUninitialize on this thread
// because IIS does this automatically.
try
{
// Create an XML document in memory.
MSXML2::IXMLDOMDocument3Ptr doc(__uuidof(MSXML2::DOMDocument60));
// Create a cacheProvider root element and
// append this root element to the XML document.
MSXML2::IXMLDOMElementPtr cacheProviderElement =
doc->createElement(L"cacheProvider");
doc->appendChild(cacheProviderElement);
// Get the IHttpCacheKey pointer from the ICacheProvider
// pointer.
IHttpCacheKey* cacheKey = pProvider->GetCacheKey();
// Create an element for the cache key and add
// that element to the cacheProviderElement.
MSXML2::IXMLDOMElementPtr cacheKeyElement =
CreateElement(cacheKey, doc);
cacheProviderElement->appendChild(cacheKeyElement);
// Write the XML using the writer.
m_eventWriter.ReportInfo(doc);
}
// Catch any _com_error that occurs while you are
// writing to the XML document in memory.
catch (_com_error& ce)
{
// Get the description for the error.
wstring description = ce.Description();
// Write the error to the event writer.
m_eventWriter.ReportError(description);
}
// Return GL_NOTIFICATION_CONTINUE so that
// other listeners will receive the event.
return GL_NOTIFICATION_CONTINUE;
}
// The OnGlobalCacheCleanup method is called when
// GL_CACHE_CLEANUP events occur.
// return: GL_NOTIFICATION_CONTINUE.
virtual GLOBAL_NOTIFICATION_STATUS OnGlobalCacheCleanup(VOID)
{
// Return GL_NOTIFICATION_CONTINUE so that
// other listeners will receive this event.
return GL_NOTIFICATION_CONTINUE;
}
// PRE: none.
// POST: the Terminate method calls delete on this,
// which releases the memory for the current
// CGlobalCacheModule pointer on the heap.
virtual VOID Terminate(VOID)
{
delete this;
}
protected:
// Creates the constructor for
// the CGlobalCacheModule class.
CGlobalCacheModule() : m_eventWriter(L"IISADMIN")
{
}
// The AddAttribute creates a new attribute using
// the doc value, sets the new attribute's name and
// text, adds the new attribute to the element value
// and, finally, returns the attribute.
// PRE: neither the element nor the doc
// parameters are NULL.
// name: the name of the attribute.
// text: the text of the attribute.
// element: the element to add the new attribute to.
// doc: the XML document for creating a new attribute.
// return: the new IXMLDOMAttributePtr
// that is added to the element.
// throws: a _com_error exception.
static MSXML2::IXMLDOMAttributePtr AddAttribute
(
const wstring& name,
const wstring& text,
MSXML2::IXMLDOMElementPtr element,
MSXML2::IXMLDOMDocument3Ptr doc
) throw (_com_error)
{
// Create an attribute with the name.
MSXML2::IXMLDOMAttributePtr attribute =
doc->createAttribute(name.c_str());
// Set the text of the attribute to the text value.
attribute->text = text.c_str();
// Add the attribute to the passed element.
element->setAttributeNode(attribute);
// Return the new attribute to the caller.
return attribute;
}
// The CreateElement method converts an IHttpTokenKey
// pointer and its descendant data to an XML element.
// PRE: the doc parameter must not be NULL.
// tokenKey: the IHttpTokenKey pointer
// to convert to an XML element.
// doc: the XML document used for creating a new element.
// return: a new MSXML2::IXMLDOMElementPtr representing
// the data in the tokenKey parameter and its descendents.
// throws: a _com_error exception.
static MSXML2::IXMLDOMElementPtr CreateElement
(
IHttpTokenKey* tokenKey,
MSXML2::IXMLDOMDocument3Ptr doc
) throw (_com_error)
{
// Create a new element to return.
MSXML2::IXMLDOMElementPtr tokenKeyElement =
doc->createElement(L"tokenKey");
// If the tokenKey parameter is NULL,
// return the empty tokenKeyElement.
if (NULL == tokenKey)
{
return tokenKeyElement;
}
// Get the user name from the
// IHttpTokenKey pointer.
wstring userName = tokenKey->GetUserName();
// Add a userName attribute to
// the tokenKeyElement.
AddAttribute(L"userName", userName,
tokenKeyElement, doc);
// Get the password hash from
// the IHttpTokenKey pointer.
wstring passwordHash = tokenKey->GetPasswordHash();
// Add a passwordHash attribute
// to the tokenKeyElement.
AddAttribute(L"passwordHash", passwordHash,
tokenKeyElement, doc);
// Get the logon method from the
// IHttpTokenKey pointer.
DWORD logonMethod = tokenKey->GetLogonMethod();
// Convert the logonMethod to a wstring.
wstring logonMethodString =
CConvert::ToString(logonMethod);
// Add a logon attribute to
// the tokenKeyElement.
AddAttribute(L"logon", logonMethodString,
tokenKeyElement, doc);
// Return the tokenKeyElement to the caller.
return tokenKeyElement;
}
// The CreateElement method converts an IFileKey pointer
// and its decsendant data to an XML element.
// PRE: the doc parameter must not be NULL.
// POST: none.
// fileKey: the IFileKey pointer to convert to an XML element.
// return: a new MSXML2::IXMLDOMElementPtr representing
// the data in the fileKey parameter and its descendants.
// throws: a _com_error exception.
static MSXML2::IXMLDOMElementPtr CreateElement
(
IFileKey* fileKey,
MSXML2::IXMLDOMDocument3Ptr doc
) throw (_com_error)
{
// Create a new element to return.
MSXML2::IXMLDOMElementPtr fileKeyElement =
doc->createElement(L"fileKey");
// If the fileKey is empty return the fileKeyElement.
if (NULL == fileKey)
{
return fileKeyElement;
}
// Get the path from the
// IFileKey pointer.
wstring path = fileKey->GetPath();
// Add a path attribute to the
// fileKeyElement.
AddAttribute(L"path", path, fileKeyElement, doc);
// Return the fileKeyElement to the caller.
return fileKeyElement;
}
// The CreateElement method converts an IUriKey pointer
// and its descendant data into an XML element.
// PRE: the doc parameter must not be NULL.
// uriKey: the IUriKey pointer to convert to an XML element.
// return: a new MSXML2::IXMLDOMElementPtr representing
// the data in the uriKey parameter and its descendants.
// throws: a _com_error exception.
static MSXML2::IXMLDOMElementPtr CreateElement
(
IUriKey* uriKey,
MSXML2::IXMLDOMDocument3Ptr doc
) throw (_com_error)
{
// Create a new element to return.
MSXML2::IXMLDOMElementPtr uriKeyElement =
doc->createElement(L"uriKey");
// If uriKey is NULL, return the uriKeyElement.
if (NULL == uriKey)
{
return uriKeyElement;
}
// Get the site identifier from
// the IUriKey pointer.
DWORD siteIdDWORD = uriKey->GetSiteId();
// Convert the siteId to a wstring.
wstring siteId =
CConvert::ToString(siteIdDWORD);
// Add a siteId attribute to
// the uriKeyElement.
AddAttribute(L"siteId", siteId,
uriKeyElement, doc);
// Get the site name from
// the IUriKey pointer.
wstring siteName = uriKey->GetSiteName();
// Add a siteName attribute to
// the uriKeyElement.
AddAttribute(L"siteName", siteName,
uriKeyElement, doc);
// Get the URL from
// the IUriKey pointer.
wstring url = uriKey->GetUrl();
// Add a url attribute to
// the uriKeyElement.
AddAttribute(L"url", url,
uriKeyElement, doc);
// Return the uriKeyElement to the caller.
return uriKeyElement;
}
// The CreateElement method converts an IHttpCacheKey
// pointer and its descendant data into an XML element.
// PRE: the doc parameter must not be NULL.
// cacheKey: the IHttpCacheKey pointer
// to convert to an XML element.
// return: a new MSXML2::IXMLDOMElementPtr representing
// the data in the cacheKey parameter and its descendants.
// throws: a _com_error exception.
static MSXML2::IXMLDOMElementPtr CreateElement
(
IHttpCacheKey* cacheKey,
MSXML2::IXMLDOMDocument3Ptr doc
) throw (_com_error)
{
// Create a default cache key element to return.
MSXML2::IXMLDOMElementPtr cacheKeyElement =
doc->createElement(L"cacheKey");
// If the cacheKey parameter is NULL
// return the empty cacheKeyElement.
if (NULL == cacheKey)
{
return cacheKeyElement;
}
// Get the cache name of the key. The name of this
// cache key indicates what interface extension to which
// the IHttpCacheKey pointer can be safely downcast.
wstring cacheName = cacheKey->GetCacheName();
// If the cacheName is FILE_CACHE_NAME, it is safe to
// downcast the cacheKey to an IFileKey pointer.
if (FILE_CACHE_NAME == cacheName)
{
// Downcast the cacheKey to an IFileKey
// pointer for additional functionality.
IFileKey* fileKey =
dynamic_cast<IFileKey*>(cacheKey);
// Reset the cacheKeyElement to the new element.
cacheKeyElement = CreateElement(fileKey, doc);
}
// If the cacheName is URI_CACHE_NAME, it is safe
// to downcast the cacheKey to an IUriKey pointer.
if (URI_CACHE_NAME == cacheName)
{
// Downcast the cacheKey to an IUriKey
// pointer for additional functionality.
IUriKey* uriKey =
dynamic_cast<IUriKey*>(cacheKey);
// Reset the cacheKeyElement to the new element.
cacheKeyElement = CreateElement(uriKey, doc);
}
// If cacheName is TOKEN_CACHE_NAME, it is safe to
// downcast the cacheKey to an IHttpTokenKey pointer.
if (TOKEN_CACHE_NAME == cacheName)
{
// Downcast the cacheKey to an IHttpTokenKey pointer.
IHttpTokenKey* tokenKey =
dynamic_cast<IHttpTokenKey*>(cacheKey);
// Reset the cacheKeyElement to the new element.
cacheKeyElement = CreateElement(tokenKey, doc);
}
// Add an attribute to the cacheKeyElement
// for cache name information.
AddAttribute(L"cacheName", cacheName,
cacheKeyElement, doc);
// Get the hash from the
// IHttpCacheKey pointer.
DWORD hashDWORD = cacheKey->GetHash();
// Convert the DWORD to a wstring.
wstring hash = CConvert::ToString(hashDWORD);
// Add an attribute to the
// cacheKeyElement for hash information.
AddAttribute(L"hash", hash,
cacheKeyElement, doc);
// Get IsEqual information from the
// IHttpCacheKey pointer by comparing
// the current pointer.
BOOL isEqualBOOL =
cacheKey->GetIsEqual(cacheKey);
// Convert the Boolean to a wstring.
wstring isEqual = CConvert::ToString(isEqualBOOL);
// Add an attribute to the cacheKeyElement
// for equal information against itself.
AddAttribute(L"isEqual", isEqual,
cacheKeyElement, doc);
// Get GetIsPrefix information from
// the IHttpCacheKey pointer by comparing
// the current pointer.
BOOL isPrefixBOOL =
cacheKey->GetIsPrefix(cacheKey);
// Convert the Boolean to a wstring.
wstring isPrefix = CConvert::ToString(isPrefixBOOL);
// Add an isPrefix attribute to
// the cacheKeyElement.
AddAttribute(L"isPrefix", isPrefix,
cacheKeyElement, doc);
// Return the new cacheKeyElement to the caller.
return cacheKeyElement;
}
private:
// Specify the event writer.
CEventWriter m_eventWriter;
};
// The RegisterModule method is the
// main entry point for the DLL.
// dwServerVersion: the current server version.
// pModuleInfo: the current
// IHttpModuleRegistrationInfo pointer.
// pGlobalInfo: the current IHttpServer pointer.
// return: the value returned by calling the
// CGlobalCacheModule::RegisterGlobalModule
// method.
HRESULT
__stdcall
RegisterModule(
DWORD dwServerVersion,
IHttpModuleRegistrationInfo* pModuleInfo,
IHttpServer* pGlobalInfo
)
{
// Call the static method for initialization.
return CGlobalCacheModule::RegisterGlobalModule
(dwServerVersion,
pModuleInfo,
pGlobalInfo);
}
The above code writes a new event to the Event Viewer, where the Data box contains XML similar to the following.
<cacheProvider>
<fileKey
path="C:\INETPUB\WWWROOT\IISSTART.HTM"
cacheName="FILE"
hash="59594512"
isEqual="true"
isPrefix="true"/>
</cacheProvider>
<cacheProvider>
<uriKey
siteId="1"
siteName=""
url="/IISSTART.HTM"
cacheName="URI"
hash="-1945651104"
isEqual="true"
isPrefix="true"/>
</cacheProvider>
<cacheProvider>
<tokenKey
userName="IUSR"
hashedPassword="abcdefg"
logon="3"
cacheName="TOKEN"
hash="0"
isEqual="true"
isPrefix="false"/>
</cacheProvider>
Your module must export the RegisterModule function. You can export this function by creating a module definition (.def) file for your project, or you can compile the module by using the /EXPORT:RegisterModule switch. For more information, see Walkthrough: Creating a Request-Level HTTP Module By Using Native Code.
You can optionally compile the code by using the __stdcall (/Gz) calling convention instead of explicitly declaring the calling convention for each function.
Inheritance Hierarchy
IHttpCacheKey
Requirements
| Type | Description |
|---|---|
| Client | - IIS 7.0 on Windows Vista - IIS 7.5 on Windows 7 - IIS 8.0 on Windows 8 - IIS 10.0 on Windows 10 |
| Server | - IIS 7.0 on Windows Server 2008 - 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 Technical Preview |
| Product | - IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0 - IIS Express 7.5, IIS Express 8.0, IIS Express 10.0 |
| Header | Httpserv.h |