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

git-subtree-dir: src/ripple/rocksdb/rocksdb
git-subtree-split: 56589ab81f

tools/shell/ShellState.h

@@ -0,0 +1,87 @@
+
+#ifndef TOOLS_SHELL_SHELLSTATE
+#define TOOLS_SHELL_SHELLSTATE
+
+class ShellContext;
+
+/*
+ * Currently, there are four types of state in total
+ * 1. start state: the first state the program enters
+ * 2. connecting state: the program try to connect to a rocksdb server, whose
+ *    previous states could be "start" or "connected" states
+ * 3. connected states: the program has already connected to a server, and is
+ *    processing user commands
+ * 4. stop state: the last state the program enters, do some cleaning up things
+ */
+
+class ShellState {
+ public:
+  virtual void run(ShellContext *) = 0;
+  virtual ~ShellState() {}
+};
+
+
+class ShellStateStart : public ShellState {
+ public:
+  static ShellStateStart * getInstance(void) {
+    static ShellStateStart instance;
+    return &instance;
+  }
+
+  virtual void run(ShellContext *);
+
+ private:
+  ShellStateStart() {}
+  virtual ~ShellStateStart() {}
+};
+
+class ShellStateStop : public ShellState {
+ public:
+  static ShellStateStop * getInstance(void) {
+    static ShellStateStop instance;
+    return &instance;
+  }
+
+  virtual void run(ShellContext *);
+
+ private:
+  ShellStateStop() {}
+  virtual ~ShellStateStop() {}
+
+};
+
+class ShellStateConnecting : public ShellState {
+ public:
+  static ShellStateConnecting * getInstance(void) {
+    static ShellStateConnecting instance;
+    return &instance;
+  }
+
+  virtual void run(ShellContext *);
+
+ private:
+  ShellStateConnecting() {}
+  virtual ~ShellStateConnecting() {}
+
+};
+
+class ShellStateConnected : public ShellState {
+ public:
+  static ShellStateConnected * getInstance(void) {
+    static ShellStateConnected instance;
+    return &instance;
+  }
+
+  virtual void run(ShellContext *);
+
+ private:
+  ShellStateConnected() {}
+  virtual ~ShellStateConnected() {}
+
+  void unknownCmd();
+  void handleConError(ShellContext *);
+  void helpMsg();
+};
+
+#endif
+