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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.
*/
#ifndef _THRIFT_TDISPATCHPROCESSOR_H_
#define _THRIFT_TDISPATCHPROCESSOR_H_ 1
#include <thrift/TProcessor.h>
namespace apache { namespace thrift {
/**
* TDispatchProcessor is a helper class to parse the message header then call
* another function to dispatch based on the function name.
*
* Subclasses must implement dispatchCall() to dispatch on the function name.
*/
template <class Protocol_>
class TDispatchProcessorT : public TProcessor {
public:
virtual bool process(boost::shared_ptr<protocol::TProtocol> in,
boost::shared_ptr<protocol::TProtocol> out,
void* connectionContext) {
protocol::TProtocol* inRaw = in.get();
protocol::TProtocol* outRaw = out.get();
// Try to dynamic cast to the template protocol type
Protocol_* specificIn = dynamic_cast<Protocol_*>(inRaw);
Protocol_* specificOut = dynamic_cast<Protocol_*>(outRaw);
if (specificIn && specificOut) {
return processFast(specificIn, specificOut, connectionContext);
}
// Log the fact that we have to use the slow path
T_GENERIC_PROTOCOL(this, inRaw, specificIn);
T_GENERIC_PROTOCOL(this, outRaw, specificOut);
std::string fname;
protocol::TMessageType mtype;
int32_t seqid;
inRaw->readMessageBegin(fname, mtype, seqid);
// If this doesn't look like a valid call, log an error and return false so
// that the server will close the connection.
//
// (The old generated processor code used to try to skip a T_STRUCT and
// continue. However, that seems unsafe.)
if (mtype != protocol::T_CALL && mtype != protocol::T_ONEWAY) {
GlobalOutput.printf("received invalid message type %d from client",
mtype);
return false;
}
return this->dispatchCall(inRaw, outRaw, fname, seqid, connectionContext);
}
protected:
bool processFast(Protocol_* in, Protocol_* out, void* connectionContext) {
std::string fname;
protocol::TMessageType mtype;
int32_t seqid;
in->readMessageBegin(fname, mtype, seqid);
if (mtype != protocol::T_CALL && mtype != protocol::T_ONEWAY) {
GlobalOutput.printf("received invalid message type %d from client",
mtype);
return false;
}
return this->dispatchCallTemplated(in, out, fname,
seqid, connectionContext);
}
/**
* dispatchCall() methods must be implemented by subclasses
*/
virtual bool dispatchCall(apache::thrift::protocol::TProtocol* in,
apache::thrift::protocol::TProtocol* out,
const std::string& fname, int32_t seqid,
void* callContext) = 0;
virtual bool dispatchCallTemplated(Protocol_* in, Protocol_* out,
const std::string& fname, int32_t seqid,
void* callContext) = 0;
};
/**
* Non-templatized version of TDispatchProcessor, that doesn't bother trying to
* perform a dynamic_cast.
*/
class TDispatchProcessor : public TProcessor {
public:
virtual bool process(boost::shared_ptr<protocol::TProtocol> in,
boost::shared_ptr<protocol::TProtocol> out,
void* connectionContext) {
std::string fname;
protocol::TMessageType mtype;
int32_t seqid;
in->readMessageBegin(fname, mtype, seqid);
if (mtype != protocol::T_CALL && mtype != protocol::T_ONEWAY) {
GlobalOutput.printf("received invalid message type %d from client",
mtype);
return false;
}
return dispatchCall(in.get(), out.get(), fname, seqid, connectionContext);
}
protected:
virtual bool dispatchCall(apache::thrift::protocol::TProtocol* in,
apache::thrift::protocol::TProtocol* out,
const std::string& fname, int32_t seqid,
void* callContext) = 0;
};
// Specialize TDispatchProcessorT for TProtocol and TDummyProtocol just to use
// the generic TDispatchProcessor.
template <>
class TDispatchProcessorT<protocol::TDummyProtocol> :
public TDispatchProcessor {};
template <>
class TDispatchProcessorT<protocol::TProtocol> :
public TDispatchProcessor {};
}} // apache::thrift
#endif // _THRIFT_TDISPATCHPROCESSOR_H_
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