const seneca = require('seneca')()

seneca.add({role: 'math', cmd: 'sum'}, function (msg, respond) {
  var sum = msg.left + msg.right
  respond(null, {answer: sum})
})

// 下面两条消息都匹配 role: math, cmd: sum

seneca.act({role: 'math', cmd: 'sum', left: 1.5, right: 2.5}, console.log)
seneca.act({role: 'math', cmd: 'sum', left: 1.5, right: 2.5, integer: true}, console.log)

setTimeout(() => {
  seneca.add({role: 'math', cmd: 'sum', integer: true}, function (msg, respond) {
    var sum = Math.floor(msg.left) + Math.floor(msg.right)
    respond(null, { answer: sum })
  })

  // 下面这条消息同样匹配 role: math, cmd: sum
  seneca.act({role: 'math', cmd: 'sum', left: 1.5, right: 2.5}, console.log)

  // 但是，也匹配 role:math,cmd:sum,integer:true
  // 但是因为更多属性被匹配到，所以，它的优先级更高
  seneca.act({role: 'math', cmd: 'sum', left: 1.5, right: 2.5, integer: true}, console.log)
}, 100)