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