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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 <TProcessor.h>
+#include <transport/TTransport.h>
+#include <transport/TTransportUtils.h>
+#include <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);
+
+ // 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