REST: {
      basePath: "/players",
      description: "player service REST API",
      routes: [

        {
          method: "GET",
          path: "/:id",
          deprecated: false,
          description: "Get player information by id",
          call: {
            action: "player.get",
            params: {
              id: "@path.id",
            },          
          },
        },

        {
          method: "GET",
          path: "/me",
          deprecated: false,
          description: "Get player information of mine",
          call: {
            action: "player.get",
            params: {
              id: "@context.user.player.id",
            },          
          },
        },

        {
          method: "GET",
          path: "/me",
          deprecated: false,
          description: "Get player information of mine",
          map: `({ path, query, body, context }) => context.user.player`,
        },

        {
          method: "POST",
          path: "/message",
          deprecated: false,
          description: "Push notifications to all players",
          publish: {
            event: "player.message",
            broadcast: false,
            params: {
              userId: "@context.user.player.id",
              message: "@body.message",
            },
          },
        },

      ],
    },

// @body 객체 전체를 페이로드로 전달하거나 스트림을 전달 할 때 이용됩니다.
params: "@body",

// @ 문자열로 시작되지 않는 값들은 해석되지 않고 그대로 전달됩니다.
params: {
  foo: "@path.foo", // will bar parsed
  bar: "query.bar", // will be "query.bar"
  zzz: ["any", { obj: "ject", can: "be", "use": 2 }],
},

// 항상 string 타입을 갖는 @query, @path 객체의 속성들에 한해서 타입을 boolean이나 number로 변환 할 수 있습니다.
params: {
  foo: "@path.foo:number",
  bar: "@query.bar:boolean",
},

    GraphQL: {
      typeDefs: `
        """Soccer Player"""
        type Player implements Node {
          id: ID!
          email: String!
          name: String!
          photoURL: String
          position: String
          """A team player belongs to"""
          team: Team
        }

        extend type Query {
          """Current Player"""
          viewer: Player
          player(id: ID!): Player
        }

        extend type Subscription {
          playerMessage: String!
          playerUpdated: Player
        }
      `,

      resolvers: {

        Player: {

          team: {
            call: {
              action: "team.get",
              params: {
                id: "@source.teamId",
              },
            },
          },

          position: `({ source, args, context, info }) => source.position.toUpperCase()`,
`

          // be noted that special field __isTypeOf got only three arguments
          __isTypeOf: `({ source, context, info }) => return source.someSpecialFieldForThisType != null`,

          // be noted that special field __resolveType got only three arguments
          __resolveType: `
            ({ source, context, info }) => {
              if (source.someSpecialFieldForThisType != null) {
                return "TypeA";
              } else {
                return "TypeB";
              }
            }
          `,
        },

        Query: {
          viewer: {
            call: {
              action: "player.get",
              params: {
                id: "@context.user.player.id[]",
              },
            },
          },
          player: {
            call: {
              action: "player.get",
              params: {
                id: "@args.id[]",
              },
            },
          },
        },

query {
  viewer {
    id
    email
  }
  one: player(id: 1) {
    id
    email
  }
  two: player(id: 2) {
    id
    email
  }
  three: player(id: 3) {
    id
    email
  }
}

        Subscription: {
          playerMessage: {
            subscribe: {
              events: ["player.message"],
            },
          },

          playerMessage: {
            subscribe: {
              events: ["player.message"],
              map: `({ source, args, context, info }) => source.payload.message`,
            },
          },
        },
      },
    },