65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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#ifndef TOOLS_SHELL_DBCLIENTPROXY
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#define TOOLS_SHELL_DBCLIENTPROXY
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#include <vector>
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#include <map>
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#include <string>
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#include <boost/utility.hpp>
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#include <boost/shared_ptr.hpp>
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#include "DB.h"
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/*
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* class DBClientProxy maintains:
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* 1. a connection to leveldb service
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* 2. a map from db names to opened db handles
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*
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* it's client codes' responsibility to catch all possible exceptions.
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*/
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namespace leveldb {
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class DBClientProxy : private boost::noncopyable {
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public:
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// connect to host_:port_
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void connect(void);
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// return true on success, false otherwise
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bool get(const std::string & db,
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const std::string & key,
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std::string & value);
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// return true on success, false otherwise
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bool put(const std::string & db,
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const std::string & key,
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const std::string & value);
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// return true on success, false otherwise
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bool scan(const std::string & db,
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const std::string & start_key,
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const std::string & end_key,
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const std::string & limit,
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std::vector<std::pair<std::string, std::string> > & kvs);
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// return true on success, false otherwise
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bool create(const std::string & db);
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DBClientProxy(const std::string & host, int port);
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~DBClientProxy();
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private:
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// some internal help functions
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void cleanUp(void);
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void open(const std::string & db);
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std::map<std::string, Tleveldb::DBHandle>::iterator getHandle(const std::string & db);
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const std::string host_;
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const int port_;
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std::map<std::string, Tleveldb::DBHandle> dbToHandle_;
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boost::shared_ptr<Tleveldb::DBClient> dbClient_;
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};
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} // namespace
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#endif
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