Drizzled Public API Documentation

concurrent.h

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #pragma once
00021 
00022 #include <drizzled/plugin/client.h>
00023 #include <boost/tokenizer.hpp>
00024 #include <vector>
00025 #include <queue>
00026 #include <string>
00027 
00028 namespace drizzled
00029 {
00030 namespace plugin
00031 {
00032 namespace client
00033 {
00034 
00038 class Concurrent: public Client
00039 {
00040   typedef std::vector<char> Bytes;
00041   typedef std::queue <Bytes> Queue;
00042   Queue to_execute;
00043   bool is_dead;
00044   Bytes packet_buffer;
00045 
00046 public:
00047 
00048   Concurrent() :
00049     is_dead(false)
00050   {
00051   }
00052 
00053   virtual int getFileDescriptor(void) { return -1; }
00054   virtual bool isConnected(void) { return true; }
00055   virtual bool isReading(void) { return false; }
00056   virtual bool isWriting(void) { return false; }
00057   virtual bool flush(void) { return false; }
00058   virtual void close(void) {}
00059   virtual bool authenticate(void) { return true; }
00060 
00061   virtual bool readCommand(char **packet, uint32_t *packet_length)
00062   {
00063     while(not to_execute.empty())
00064     {
00065       Queue::value_type next= to_execute.front();
00066       packet_buffer.resize(next.size());
00067       memcpy(&packet_buffer[0], &next[0], next.size());
00068 
00069       *packet= &packet_buffer[0];
00070 
00071       *packet_length= next.size();
00072 
00073       to_execute.pop();
00074 
00075       return true;
00076     }
00077 
00078     if (not is_dead)
00079     {
00080       packet_buffer.resize(1);
00081       *packet_length= 1;
00082       *packet= &packet_buffer[0];
00083       is_dead= true;
00084 
00085       return true;
00086     }
00087 
00088     *packet_length= 0;
00089     return false;
00090   }
00091 
00092   virtual void sendOK(void) {}
00093   virtual void sendEOF(void) {}
00094   virtual void sendError(const drizzled::error_t, const char*) {}
00095   virtual bool sendFields(List<Item>*) { return false; }
00096   virtual bool store(Field *) { return false; }
00097   virtual bool store(void) { return false; }
00098   virtual bool store(int32_t) { return false; }
00099   virtual bool store(uint32_t) { return false; }
00100   virtual bool store(int64_t) { return false; }
00101   virtual bool store(uint64_t) { return false; }
00102   virtual bool store(double, uint32_t, String*) { return false; }
00103   virtual bool store(const type::Time*) { return false; }
00104   virtual bool store(const char*) { return false; }
00105   virtual bool store(const char*, size_t) { return false; }
00106   virtual bool store(const std::string &) { return false; }
00107   virtual bool haveMoreData(void) { return false;}
00108   virtual bool haveError(void) { return false; }
00109   virtual bool wasAborted(void) { return false; }
00110 
00111   void pushSQL(const std::string &arg)
00112   {
00113     Bytes byte;
00114     typedef boost::tokenizer<boost::escaped_list_separator<char> > Tokenizer;
00115     Tokenizer tok(arg, boost::escaped_list_separator<char>("\\", ";", "\""));
00116 
00117     {
00118       byte.resize(sizeof("START TRANSACTION")); // +1 for the COM_QUERY, provided by null count from sizeof()
00119       byte[0]= COM_QUERY;
00120       memcpy(&byte[1], "START TRANSACTION", sizeof("START TRANSACTION") -1);
00121       to_execute.push(byte);
00122     }
00123 
00124     for (Tokenizer::iterator iter= tok.begin(); iter != tok.end(); ++iter)
00125     {
00126       byte.resize(iter->size() +1); // +1 for the COM_QUERY
00127       byte[0]= COM_QUERY;
00128       memcpy(&byte[1], iter->c_str(), iter->size());
00129       to_execute.push(byte);
00130     }
00131 
00132     {
00133       byte.resize(sizeof("COMMIT")); // +1 for the COM_QUERY, provided by null count from sizeof()
00134       byte[0]= COM_QUERY;
00135       memcpy(&byte[1], "COMMIT", sizeof("COMMIT") -1);
00136       to_execute.push(byte);
00137     }
00138   }
00139 };
00140 
00141 } /* namespace client */
00142 } /* namespace plugin */
00143 } /* namespace drizzled */
00144