load the application Map and Reduce functions from a plugin file, e.g. .so files
(filename string)
| 46 | // from a plugin file, e.g. .so files |
| 47 | // |
| 48 | func loadPlugin(filename string) (func(string, string, MrContext), func(string, []string, MrContext)) { |
| 49 | if _, err := os.Stat(filename); os.IsNotExist(err) { |
| 50 | log.Panic(err) |
| 51 | } |
| 52 | p, err := plugin.Open(filename) |
| 53 | if err != nil { |
| 54 | log.Panic(err) |
| 55 | } |
| 56 | xmapf, err := p.Lookup("Map") |
| 57 | if err != nil { |
| 58 | log.Panic(err) |
| 59 | } |
| 60 | mapf := xmapf.(func(string, string, MrContext)) |
| 61 | xreducef, err := p.Lookup("Reduce") |
| 62 | if err != nil { |
| 63 | log.Panic(err) |
| 64 | } |
| 65 | reducef := xreducef.(func(string, []string, MrContext)) |
| 66 | |
| 67 | return mapf, reducef |
| 68 | } |