Generated by XState Viz: https://xstate.js.org/viz

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'fetch',
    initial: 'gettingFromCache',
    context: {
      fetchTimes: 0,
      fetchRetryCount: 4
    },
    states: {
      gettingFromCache: {
        on: {
          cacheReadError: [
            {
              target: 'error',
              cond: context => context.fetchTimes > 0
            },
            {
              target: 'fetching'
            }
          ],
          cacheReadSuccess: 'success'
        }
      },
      fetching: {
        on: {
          fetchSuccess: {
            target: 'writingToCache',
            actions: assign({
              fetchTimes: (context, event) => context.fetchTimes + 1
            })
          },
          fetchError: [
            {
              target: 'error',
              cond: context => context.fetchTimes >= context.fetchRetryCount,
              actions: assign({
              fetchTimes: (context, event) => context.fetchTimes + 1
            })
            },
            {
              target: 'fetching',
              actions: assign({
              fetchTimes: (context, event) => context.fetchTimes + 1
            })
            }  
          ]
        }
      },
      writingToCache: {
        on: {
          cacheWritingSuccess: 'gettingFromCache',
          cacheWritingError: 'error'
        }
      },
      success: {
        type: 'final'
      },
      error: {
        type: 'final'
      }
    }
  });