rocksdb/thrift/lib/cpp/transport/TShortReadTransport.h

/*
 * 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_TRANSPORT_TSHORTREADTRANSPORT_H_
#define _THRIFT_TRANSPORT_TSHORTREADTRANSPORT_H_ 1

#include <cstdlib>

#include "thrift/lib/cpp/transport/TTransport.h"
#include "thrift/lib/cpp/transport/TVirtualTransport.h"

namespace apache { namespace thrift { namespace transport { namespace test {

/**
 * This class is only meant for testing.  It wraps another transport.
 * Calls to read are passed through with some probability.  Otherwise,
 * the read amount is randomly reduced before being passed through.
 *
 */
class TShortReadTransport : public TVirtualTransport<TShortReadTransport> {
 public:
  TShortReadTransport(boost::shared_ptr<TTransport> transport, double full_prob)
    : transport_(transport)
    , fullProb_(full_prob)
  {}

  bool isOpen() {
    return transport_->isOpen();
  }

  bool peek() {
    return transport_->peek();
  }

  void open() {
    transport_->open();
  }

  void close() {
    transport_->close();
  }

  uint32_t read(uint8_t* buf, uint32_t len) {
    if (len == 0) {
      return 0;
    }

    if (rand()/(double)RAND_MAX >= fullProb_) {
      len = 1 + rand()%len;
    }
    return transport_->read(buf, len);
  }

  void write(const uint8_t* buf, uint32_t len) {
    transport_->write(buf, len);
  }

  void flush() {
    transport_->flush();
  }

  const uint8_t* borrow(uint8_t* buf, uint32_t* len) {
    return transport_->borrow(buf, len);
  }

  void consume(uint32_t len) {
    return transport_->consume(len);
  }

  boost::shared_ptr<TTransport> getUnderlyingTransport() {
    return transport_;
  }

 protected:
  boost::shared_ptr<TTransport> transport_;
  double fullProb_;
};

}}}} // apache::thrift::transport::test

#endif // #ifndef _THRIFT_TRANSPORT_TSHORTREADTRANSPORT_H_