/
cht.hpp
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/
cht.hpp
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// Jubatus: Online machine learning framework for distributed environment
// Copyright (C) 2011 Preferred Infrastructure and Nippon Telegraph and Telephone Corporation.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#pragma once
#include <string>
#include <cstdlib>
#include <vector>
#include <map>
#include "shared_ptr.hpp"
#include "lock_service.hpp"
namespace jubatus{
namespace common{
static const unsigned int NUM_VSERV = 8;
// this function does not seem pure, take care when calling from multiple threads
std::string make_hash(const std::string& key);
class cht{
public:
cht(cshared_ptr<lock_service>, const std::string&);
~cht();
// node :: ip_port
// register_node :: node -> bool;
void register_node(const std::string&, int);
// find(hash) :: key -> [node] where hash(node0) <= hash(key) < hash(node1) < hash(node2) < ...
bool find(const std::string& host, int port, std::vector<std::pair<std::string,int> >&);
bool find(const std::string&, std::vector<std::pair<std::string,int> >&);
// run just once in starting up the process: creates <name>/cht directory.
static void setup_cht_dir(lock_service&, const std::string&);
private:
std::string name_;
cshared_ptr<lock_service> lock_service_;
}; //cht
}
}