50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
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package react
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// A Reactor manages linked cells.
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type Reactor interface {
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// CreateInput creates an input cell linked into the reactor
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// with the given initial value.
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CreateInput(int) InputCell
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// CreateCompute1 creates a compute cell which computes its value
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// based on one other cell. The compute function will only be called
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// if the value of the passed cell changes.
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CreateCompute1(Cell, func(int) int) ComputeCell
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// CreateCompute2 is like CreateCompute1, but depending on two cells.
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// The compute function will only be called if the value of any of the
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// passed cells changes.
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CreateCompute2(Cell, Cell, func(int, int) int) ComputeCell
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}
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// A Cell is conceptually a holder of a value.
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type Cell interface {
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// Value returns the current value of the cell.
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Value() int
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}
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// An InputCell has a changeable value, changing the value triggers updates to
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// other cells.
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type InputCell interface {
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Cell
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// SetValue sets the value of the cell.
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SetValue(int)
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}
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// A ComputeCell always computes its value based on other cells and can
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// call callbacks upon changes.
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type ComputeCell interface {
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Cell
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// AddCallback adds a callback which will be called when the value changes.
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// It returns a callback handle which can be used to remove the callback.
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AddCallback(func(int)) CallbackHandle
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// RemoveCallback removes a previously added callback, if it exists.
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RemoveCallback(CallbackHandle)
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}
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// A CallbackHandle is used to remove previously added callbacks, see ComputeCell.
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type CallbackHandle interface{}
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