/// <summary>Get a server protocol's signature</summary>
/// <param name="clientMethodsHashCode">client protocol methods hashcode</param>
/// <param name="serverVersion">server protocol version</param>
/// <param name="protocol">protocol</param>
/// <returns>the server's protocol signature</returns>
public static ProtocolSignature GetProtocolSignature(int clientMethodsHashCode, long
serverVersion, Type protocol)
{
// try to get the finger print & signature from the cache
ProtocolSignature.ProtocolSigFingerprint sig = GetSigFingerprint(protocol, serverVersion
);
// check if the client side protocol matches the one on the server side
if (clientMethodsHashCode == sig.fingerprint)
{
return(new ProtocolSignature(serverVersion, null));
}
// null indicates a match
return(sig.signature);
}
/// <summary>Return a protocol's signature and finger print from cache</summary>
/// <param name="protocol">a protocol class</param>
/// <param name="serverVersion">protocol version</param>
/// <returns>its signature and finger print</returns>
private static ProtocolSignature.ProtocolSigFingerprint GetSigFingerprint(Type protocol
, long serverVersion)
{
string protocolName = RPC.GetProtocolName(protocol);
lock (ProtocolFingerprintCache)
{
ProtocolSignature.ProtocolSigFingerprint sig = ProtocolFingerprintCache[protocolName
];
if (sig == null)
{
int[] serverMethodHashcodes = GetFingerprints(protocol.GetMethods());
sig = new ProtocolSignature.ProtocolSigFingerprint(new ProtocolSignature(serverVersion
, serverMethodHashcodes), GetFingerprint(serverMethodHashcodes));
ProtocolFingerprintCache[protocolName] = sig;
}
return(sig);
}
}
