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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 PEEKPROCESSOR_H
#define PEEKPROCESSOR_H
#include <string>
#include <thrift/TProcessor.h>
#include <thrift/transport/TTransport.h>
#include <thrift/transport/TTransportUtils.h>
#include <thrift/transport/TBufferTransports.h>
#include <boost/shared_ptr.hpp>
namespace apache {
namespace thrift {
namespace processor {
/*
* Class for peeking at the raw data that is being processed by another processor
* and gives the derived class a chance to change behavior accordingly
*
*/
class PeekProcessor : public apache::thrift::TProcessor {
public:
PeekProcessor();
virtual ~PeekProcessor();
// Input here: actualProcessor - the underlying processor
// protocolFactory - the protocol factory used to wrap the memory buffer
// transportFactory - this TPipedTransportFactory is used to wrap the source transport
// via a call to getPipedTransport
void initialize(
boost::shared_ptr<apache::thrift::TProcessor> actualProcessor,
boost::shared_ptr<apache::thrift::protocol::TProtocolFactory> protocolFactory,
boost::shared_ptr<apache::thrift::transport::TPipedTransportFactory> transportFactory);
boost::shared_ptr<apache::thrift::transport::TTransport> getPipedTransport(
boost::shared_ptr<apache::thrift::transport::TTransport> in);
void setTargetTransport(boost::shared_ptr<apache::thrift::transport::TTransport> targetTransport);
virtual bool process(boost::shared_ptr<apache::thrift::protocol::TProtocol> in,
boost::shared_ptr<apache::thrift::protocol::TProtocol> out,
void* connectionContext);
// The following three functions can be overloaded by child classes to
// achieve desired peeking behavior
virtual void peekName(const std::string& fname);
virtual void peekBuffer(uint8_t* buffer, uint32_t size);
virtual void peek(boost::shared_ptr<apache::thrift::protocol::TProtocol> in,
apache::thrift::protocol::TType ftype,
int16_t fid);
virtual void peekEnd();
private:
boost::shared_ptr<apache::thrift::TProcessor> actualProcessor_;
boost::shared_ptr<apache::thrift::protocol::TProtocol> pipedProtocol_;
boost::shared_ptr<apache::thrift::transport::TPipedTransportFactory> transportFactory_;
boost::shared_ptr<apache::thrift::transport::TMemoryBuffer> memoryBuffer_;
boost::shared_ptr<apache::thrift::transport::TTransport> targetTransport_;
};
}
}
} // apache::thrift::processor
#endif
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