source: src/Fragmentation/Automation/FragmentWorker.hpp@ ef2767

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Last change on this file since ef2767 was ef2767, checked in by Frederik Heber <heber@…>, 13 years ago

Server and Worker now also correctly exchange result.

  • Server uses FragmentQueue which also stores the obtained result.
  • Worker calls received FragmentJob::Work() function and returns the thereby calculated FragmentResult.
  • Regression test for Server/Worker now checks whether job #1 is listed twice, this basically checks whether the result has been exchanged.

There have been some concepts to understand to get this working and these

shall be briefly recorded here:

  • asynchronous communication can only work on objects that live beyond the scope of where they have been called, e.g. therefore FragmentScheduler contains a FragmentResult and FragmentWorker a FragmentJob instance. They receive this object and need the write access in the scope of the aync. comm. and not of the caller's scope. This is probably because the initial argument is only used to set up a buffer of correct length. However, the received instance is created/deserialized first when the communication is completed. And this may well be after the caller's scope has been left.
  • This is different to read operations as probably there the object to send is immediately serialized and placed into an internal buffer such that later access is only to this buffer and not to the original instance which therefore does not need to exist anymore. That's why the above Schedulder and Worker do not have the "other" instance as class members as well.
  • chaining asynchronous communications, e.g. a write after a read has been performed, can only be done by using the callback functions that the async_write/read gets as parameters. They are called when the one operation has finished and therein the next operation can then be launched. This way a successful chain is executed.
  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2 * \file FragmentWorker.hpp
3 *
4 * Created on: Nov 18, 2011
5 * Author: heber
6 */
7
8#ifndef FRAGMENTWORKER_HPP_
9#define FRAGMENTWORKER_HPP_
10
11// include config.h
12#ifdef HAVE_CONFIG_H
13#include <config.h>
14#endif
15
16#include <boost/asio.hpp>
17#include <vector>
18#include "Connection.hpp"
19#include "FragmentJob.hpp"
20
21/** Receives a job from Server to execute and return FragmentResult.
22 *
23 */
24class FragmentWorker
25{
26public:
27 /// Constructor starts the asynchronous connect operation.
28 FragmentWorker(boost::asio::io_service& io_service,
29 const std::string& host, const std::string& service);
30
31 /// Handle completion of a connect operation.
32 void handle_connect(const boost::system::error_code& e,
33 boost::asio::ip::tcp::resolver::iterator endpoint_iterator);
34
35 /// Handle completion of a read operation.
36 void handle_read(const boost::system::error_code& e);
37
38 /// Handle completion of a write operation.
39 void handle_write(const boost::system::error_code& e);
40
41 enum Exitflag_t {
42 OkFlag = 0,
43 NoJobFlag = 1,
44 ErrorFlag = 255
45 };
46
47 /** Returns the flag of the handled operation.
48 *
49 */
50 size_t getExitflag() const
51 {
52 return Exitflag;
53 }
54
55private:
56 // static entity of an empty result
57 static FragmentResult EmptyResult;
58
59 /// The Connection to the server.
60 Connection connection_;
61
62 /// The data received from the server.
63 FragmentJob job;
64
65 /// The result created to be sent to the server.
66 FragmentResult result;
67
68 /// exit flag to give at program exit
69 enum Exitflag_t Exitflag;
70};
71
72#endif /* FRAGMENTWORKER_HPP_ */
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