The most common use of WAMP component is client requests a method server and server sends response to client. Client can send only the name of the method and/or can pass some parameters required by server to calculate the result. Server processes requests and if successful sends a response to client with the result. If there is any error, server sends an error response to client.
As you see, there is only One request and One response (successful or not).
Example: server has a method called GetTime, so every time a client requests this method, server returns server time.
WAMP Server
procedure OnServerCall(Connection: TsgcWSConnection; const CallId, ProcUri, Arguments: string);
begin
if ProcUri = 'GetTime' then
oServerWAMP.CallResult(CallId, FormatDateTime('yyyymmdd hh:nn:ss', Now))
else
oServer.WAMP.CallError(CallId, 'Unknown method');
end;
oServer := TsgcWebSocketServer.Create(nil);
oServer.Port := 80;
oServerWAMP := TsgcWSPServer_WAMP.Create(nil);
oServerWAMP.OnCall := OnServerCallEvent;
oServerWAMP.Server := oServer;
oServer.Active := True;WAMP Client
procedure OnCallResultClient(Connection: TsgcWSConnection; CallId, Result: string);
begin
ShowMessage(Result);
end;
procedure OnCallErrorClient(Connection: TsgcWSConnection; const Error: string);
begin
ShowMessage(Error);
end;
oClient := TsgcWebSocketClient.Create(nil);
oClient.Host := '127.0.0.1';
oClient.Port := 80;
oClientWAMP := TsgcWSPClient_WAMP.Create(nil);
oClientWAMP.OnCallResult := OnCallResultClient;
oClientWAMP.OnCallError := OnCallErrorClient;
oClientWAMP.Client := oClient;
oClient.Active := True;
// After client has connected, request GetTime from server
oClientWAMP.Call('GetTime');