95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
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package react
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import (
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"fmt"
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"strconv"
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)
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const testVersion = 4
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// MyReactor implements Reactor
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type MyReactor struct {
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lastId int
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cells []Cell
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}
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// New creates a new Reactor
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func New() *MyReactor {
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r := &MyReactor{}
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//r.callbacks = make(map[Cell][]func(int))
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return r
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}
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// CreateInput builds an input cell and adds it to the reactor
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func (r *MyReactor) CreateInput(i int) InputCell {
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r.lastId++
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ic := MyCell{val: i, id: r.lastId}
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return &ic
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}
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// CreateCompute1 Takes a cell and a function and returns a compute cell
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// which has a value based on running the function on the cells value.
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func (r *MyReactor) CreateCompute1(c Cell, f func(int) int) ComputeCell {
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r.lastId++
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cc := &MyCell{id: r.lastId, isComputed: true}
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cc.compVal = func() int { return f(c.Value()) }
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return cc
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}
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// CreateCompute2 Takes two cells and a function and returns a compute cell
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// which has a value based on running the function on the cells values.
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func (r *MyReactor) CreateCompute2(c1, c2 Cell, f func(int, int) int) ComputeCell {
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r.lastId++
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cc := &MyCell{id: r.lastId, isComputed: true}
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cc.compVal = func() int { return f(c1.Value(), c2.Value()) }
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return cc
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}
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// MyCell implements the all Cell interfaces
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type MyCell struct {
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id int
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isComputed bool
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val int
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compVal func() int
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lastCallbackId int
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callbacks map[int]func(int)
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}
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// Value returns the value of the cell
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func (c MyCell) Value() int {
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if c.isComputed {
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return c.compVal()
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}
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return c.val
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}
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// SetValue sets the value on the cell
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func (c *MyCell) SetValue(i int) {
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if i == c.val || c.isComputed {
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// No change or this is a computed cell, just return
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return
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}
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c.val = i
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// Hit all callbacks
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for _, v := range c.callbacks {
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fmt.Println("Hitting a callback: " + strconv.Itoa(i))
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v(i)
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}
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}
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func (c *MyCell) AddCallback(cb func(int)) CallbackHandle {
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if c.lastCallbackId == 0 {
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fmt.Println("Initializing Callback Map (Cell " + strconv.Itoa(c.id) + ")")
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c.callbacks = make(map[int]func(int))
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}
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fmt.Println("Adding a Callback to " + strconv.Itoa(c.id))
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c.lastCallbackId++
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c.callbacks[c.lastCallbackId] = cb
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fmt.Println("Number of Callbacks: " + strconv.Itoa(c.lastCallbackId))
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return c.lastCallbackId
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}
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func (c *MyCell) RemoveCallback(cbh CallbackHandle) {
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delete(c.callbacks, cbh.(int))
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}
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