Squashed 'src/ripple/rocksdb/rocksdb/' content from commit 56589ab

git-subtree-dir: src/ripple/rocksdb/rocksdb
git-subtree-split: 56589ab81f6827ff7402e31b24a6d548f29a524f

tools/shell/DBClientProxy.h

@@ -0,0 +1,64 @@
+
+#ifndef TOOLS_SHELL_DBCLIENTPROXY
+#define TOOLS_SHELL_DBCLIENTPROXY
+
+#include <vector>
+#include <map>
+#include <string>
+#include <boost/utility.hpp>
+#include <boost/shared_ptr.hpp>
+
+#include "DB.h"
+
+/*
+ * class DBClientProxy maintains:
+ * 1. a connection to rocksdb service
+ * 2. a map from db names to opened db handles
+ *
+ * it's client codes' responsibility to catch all possible exceptions.
+ */
+
+namespace rocksdb {
+
+class DBClientProxy : private boost::noncopyable {
+ public:
+  // connect to host_:port_
+  void connect(void);
+
+  // return true on success, false otherwise
+  bool get(const std::string & db,
+           const std::string & key,
+           std::string & value);
+
+  // return true on success, false otherwise
+  bool put(const std::string & db,
+           const std::string & key,
+           const std::string & value);
+
+  // return true on success, false otherwise
+  bool scan(const std::string & db,
+            const std::string & start_key,
+            const std::string & end_key,
+            const std::string & limit,
+            std::vector<std::pair<std::string, std::string> > & kvs);
+
+  // return true on success, false otherwise
+  bool create(const std::string & db);
+
+  DBClientProxy(const std::string & host, int port);
+  ~DBClientProxy();
+
+ private:
+  // some internal help functions
+  void cleanUp(void);
+  void open(const std::string & db);
+  std::map<std::string, Trocksdb::DBHandle>::iterator getHandle(const std::string & db);
+
+  const std::string host_;
+  const int port_;
+  std::map<std::string, Trocksdb::DBHandle> dbToHandle_;
+  boost::shared_ptr<Trocksdb::DBClient> dbClient_;
+};
+
+} // namespace
+#endif