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(*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*)
unit Thrift.Protocol.Multiplex;
interface
uses Thrift.Protocol;
{ TMultiplexedProtocol is a protocol-independent concrete decorator
that allows a Thrift client to communicate with a multiplexing Thrift server,
by prepending the service name to the function name during function calls.
NOTE: THIS IS NOT USED BY SERVERS.
On the server, use TMultiplexedProcessor to handle requests from a multiplexing client.
This example uses a single socket transport to invoke two services:
TSocket transport = new TSocket("localhost", 9090);
transport.open();
TBinaryProtocol protocol = new TBinaryProtocol(transport);
TMultiplexedProtocol mp = new TMultiplexedProtocol(protocol, "Calculator");
Calculator.Client service = new Calculator.Client(mp);
TMultiplexedProtocol mp2 = new TMultiplexedProtocol(protocol, "WeatherReport");
WeatherReport.Client service2 = new WeatherReport.Client(mp2);
System.out.println(service.add(2,2));
System.out.println(service2.getTemperature());
}
type
TMultiplexedProtocol = class( TProtocolDecorator)
public const
{ Used to delimit the service name from the function name }
SEPARATOR = ':';
private
FServiceName : String;
public
{ Wrap the specified protocol, allowing it to be used to communicate with a multiplexing server.
The serviceName is required as it is prepended to the message header so that the multiplexing
server can broker the function call to the proper service.
Args:
protocol ....... Your communication protocol of choice, e.g. TBinaryProtocol.
serviceName .... The service name of the service communicating via this protocol.
}
constructor Create( const aProtocol : IProtocol; const aServiceName : string);
{ Prepends the service name to the function name, separated by SEPARATOR.
Args: The original message.
}
procedure WriteMessageBegin( const msg: IMessage); override;
end;
implementation
constructor TMultiplexedProtocol.Create(const aProtocol: IProtocol; const aServiceName: string);
begin
ASSERT( aServiceName <> '');
inherited Create(aProtocol);
FServiceName := aServiceName;
end;
procedure TMultiplexedProtocol.WriteMessageBegin( const msg: IMessage);
// Prepends the service name to the function name, separated by TMultiplexedProtocol.SEPARATOR.
var newMsg : IMessage;
begin
case msg.Type_ of
TMessageType.Call,
TMessageType.Oneway : begin
newMsg := TMessageImpl.Create( FServiceName + SEPARATOR + msg.Name, msg.Type_, msg.SeqID);
inherited WriteMessageBegin( newMsg);
end;
else
inherited WriteMessageBegin( msg);
end;
end;
end.
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