ceph/src/jaegertracing/thrift/lib/cpp/src/thrift/transport/TShortReadTransport.h

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements. See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership. The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License. You may obtain a copy of the License at
   9  *
  10  *   http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing,
  13  * software distributed under the License is distributed on an
  14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  15  * KIND, either express or implied. See the License for the
  16  * specific language governing permissions and limitations
  17  * under the License.
  18  */
  19
  20 #ifndef _THRIFT_TRANSPORT_TSHORTREADTRANSPORT_H_
  21 #define _THRIFT_TRANSPORT_TSHORTREADTRANSPORT_H_ 1
  22
  23 #include <cstdlib>
  24
  25 #include <thrift/transport/TTransport.h>
  26 #include <thrift/transport/TVirtualTransport.h>
  27
  28 namespace apache {
  29 namespace thrift {
  30 namespace transport {
  31 namespace test {
  32
  33 /**
  34  * This class is only meant for testing.  It wraps another transport.
  35  * Calls to read are passed through with some probability.  Otherwise,
  36  * the read amount is randomly reduced before being passed through.
  37  *
  38  */
  39 class TShortReadTransport : public TVirtualTransport<TShortReadTransport> {
  40 public:
  41   TShortReadTransport(std::shared_ptr<TTransport> transport, double full_prob)
  42     : transport_(transport), fullProb_(full_prob) {}
  43
  44   bool isOpen() const override { return transport_->isOpen(); }
  45
  46   bool peek() override { return transport_->peek(); }
  47
  48   void open() override { transport_->open(); }
  49
  50   void close() override { transport_->close(); }
  51
  52   uint32_t read(uint8_t* buf, uint32_t len) {
  53     if (len == 0) {
  54       return 0;
  55     }
  56
  57     if (rand() / (double)RAND_MAX >= fullProb_) {
  58       len = 1 + rand() % len;
  59     }
  60     return transport_->read(buf, len);
  61   }
  62
  63   void write(const uint8_t* buf, uint32_t len) { transport_->write(buf, len); }
  64
  65   void flush() override { transport_->flush(); }
  66
  67   const uint8_t* borrow(uint8_t* buf, uint32_t* len) { return transport_->borrow(buf, len); }
  68
  69   void consume(uint32_t len) { return transport_->consume(len); }
  70
  71   std::shared_ptr<TTransport> getUnderlyingTransport() { return transport_; }
  72
  73 protected:
  74   std::shared_ptr<TTransport> transport_;
  75   double fullProb_;
  76 };
  77 }
  78 }
  79 }
  80 } // apache::thrift::transport::test
  81
  82 #endif // #ifndef _THRIFT_TRANSPORT_TSHORTREADTRANSPORT_H_