Drizzled Public API Documentation

concurrent.h
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
5  * Copyright (C) 2011 Vijay Samuel, vjsamuel1990@gmail.com
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; version 2 of the License.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #pragma once
22 
23 #include <drizzled/plugin/client.h>
24 #include <drizzled/execute/context.h>
25 #include <drizzled/execute/parser.h>
26 #include <drizzled/util/string.h>
27 #include <vector>
28 #include <queue>
29 #include <string>
30 #include <cstdio>
31 
32 using namespace std;
33 
34 namespace drizzled {
35 namespace plugin {
36 namespace client {
37 
41 class Concurrent: public Client
42 {
43  typedef std::queue < drizzled::util::String > Queue;
44  Queue to_execute;
45  bool is_dead;
46  drizzled::util::String packet_buffer;
47 
48 public:
49 
50  Concurrent() :
51  is_dead(false)
52  {
53  }
54 
55  virtual int getFileDescriptor(void) { return -1; }
56  virtual bool isConnected(void) { return true; }
57  virtual bool flush(void) { return false; }
58  virtual void close(void) {}
59  virtual bool authenticate(void) { return true; }
60 
61  virtual bool readCommand(char **packet, uint32_t& packet_length)
62  {
63  while(not to_execute.empty())
64  {
65  Queue::value_type next= to_execute.front();
66  packet_buffer= next;
67 
68  *packet= packet_buffer.data();
69  packet_length= next.size();
70 
71  to_execute.pop();
72 
73  return true;
74  }
75 
76  if (not is_dead)
77  {
78  packet_buffer.clear();
79  packet_length= 1;
80  *packet= packet_buffer.data();
81  is_dead= true;
82 
83  return true;
84  }
85 
86  packet_length= 0;
87  return false;
88  }
89 
90  virtual void sendOK(void) {}
91  virtual void sendEOF(void) {}
92  virtual void sendError(const drizzled::error_t, const char*) {}
93  virtual void sendFields(List<Item>&) {}
94  virtual void store(Field*) {}
95  virtual void store() {}
96  virtual void store(int32_t) {}
97  virtual void store(uint32_t) {}
98  virtual void store(int64_t) {}
99  virtual void store(uint64_t) {}
100  virtual void store(double, uint32_t, String*) {}
101  virtual void store(const type::Time*) {}
102  virtual void store(const char*) {}
103  virtual void store(const char*, size_t) {}
104  virtual void store(str_ref) {}
105  virtual bool haveError(void) { return false; }
106  virtual bool wasAborted(void) { return false; }
107 
108  void pushSQL(str_ref arg)
109  {
110  ::drizzled::error_t err_msg;
111  ::drizzled::execute::Context context(arg.data(), arg.size(), err_msg);
112  std::vector<std::string> parsed_tokens= context.start();
113 
114  {
116  byte.assign(1, COM_QUERY); // Insert our COM_QUERY
117  byte.append(drizzle_literal_parameter("START TRANSACTION")); // +1 for the COM_QUERY, provided by null count from sizeof()
118  to_execute.push(byte);
119  }
120 
121  BOOST_FOREACH(const string& iter, parsed_tokens)
122  {
124  byte.assign(1, COM_QUERY); // Insert our COM_QUERY
125  byte.append(iter.data(), iter.size());
126  to_execute.push(byte);
127  }
128 
129  {
131  byte.assign(1, COM_QUERY); // Insert our COM_QUERY
132  byte.append(drizzle_literal_parameter("COMMIT")); // +1 for the COM_QUERY, provided by null count from sizeof()
133  to_execute.push(byte);
134  }
135  }
136 };
137 
138 } /* namespace client */
139 } /* namespace plugin */
140 } /* namespace drizzled */
141