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#pragma once
#define SERVER_PROVIDER_ASSIGNSERVERS "AssignServers"
class __declspec(uuid("B54F7EB2-3D71-422D-B1D4-3FFBEFCC3088"))
IServerCollection
{
public:
// AddServer is called zero or more times to assign servers to a particular request. E.g., a server provider
// may assign servers 1 and 2 to a particular host, in which case it will call AddServer for servers 1 and 2
// each time the AssignServers export is invoked for that particular host.
//
// pszAddress - the server's address, which must be unique for each weight, httpPort, httpsPort assignment.
// Attempting to use an address with a different weight, httpPort, httpsPort that previously
// assigned will result in an error.
// dwWeight - value between 1 and 4294967295 used for load balancing. 0 is special and means use the weight
// assigned previously, or the default value from schema if not previously used.
// uHttpPort - value between 1 and 65535 indicating HTTP port. 0 is special and means use the httpPort
// assigned previously, or the default value from schema if not previously used.
// uHttpsPort - value between 1 and 65535 indicating HTTPS port. 0 is special and means use the httpsPort
// assigned previously, or the default value from schema if not previously used.
//
// RETURN VALUE: common error values include:
// HRESULT_FROM_WIN32(ERROR_DEVICE_NOT_AVAILABLE) - ARR health monitoring indicates the specified server is not healthy
// HRESULT_FROM_WIN32(ERROR_ALREADY_EXISTS) - server address was previously assigned a different weight, httpPort, or httpsPort
// E_INVALIDARG - One or more arguments are invalid
// E_OUTOFMEMORY - Ran out of memory
virtual
HRESULT
AddServer(
__in PCWSTR pszAddress,
__in DWORD dwWeight,
__in USHORT uHttpPort,
__in USHORT uHttpsPort
) = 0;
// GetInterface may be used in future releases to obtain interfaces with additional functionality.
//
// riid - a reference to the interface ID, e.g., obtained via __uuidof(IServerCollection).
// ppObject - receives a pointer to the requested interface
//
// RETURN VALUE:
// E_INVALIDARG - One or more arguments are invalid
// E_NOINTERFACE - No such interface supported
virtual
HRESULT
GetInterface(
__in REFIID riid,
__deref_out VOID ** ppObject
) = 0;
};
typedef enum _LB_ALGO_ENUM
{
LB_ALGO_ROUND_ROBIN = 0, // DEFAULT
LB_ALGO_UNSUPPORTED_1,
LB_ALGO_UNSUPPORTED_2,
LB_ALGO_UNSUPPORTED_3,
LB_ALGO_REQUEST_HASH
} LB_ALGO_ENUM;
class __declspec(uuid("9C949B25-9D13-4205-9E67-8EEB029C2741"))
IServerCollection2 : public IServerCollection
{
public:
virtual
HRESULT
SetLoadBalancingAlgorithm(
__in LB_ALGO_ENUM lba
) = 0;
};
class __declspec(uuid("AE85CF99-8D58-4652-AE8C-4615AC0C89A3"))
IServerCollection3 : public IServerCollection2
{
public:
virtual
VOID
SetCookieAffinity(
BOOL fEnable
) = 0;
};
//
// AssignServers entry point - called by ARR on each request so the server provider can assign servers to the current request
//
typedef
HRESULT
(WINAPI * PFN_ASSIGNSERVERS)(
__in PCWSTR pszWebFarmName,
__in IHttpContext * pHttpContext,
__in IServerCollection * pServerCollection
);