package done
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import (
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"sync"
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)
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// Instance is a utility for notifications of something being done.
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type Instance struct {
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access sync.Mutex
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c chan struct{}
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closed bool
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}
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// New returns a new Done.
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func New() *Instance {
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return &Instance{
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c: make(chan struct{}),
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}
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}
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// Done returns true if Close() is called.
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func (d *Instance) Done() bool {
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select {
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case <-d.Wait():
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return true
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default:
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return false
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}
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}
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// Wait returns a channel for waiting for done.
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func (d *Instance) Wait() <-chan struct{} {
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return d.c
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}
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// Close marks this Done 'done'. This method may be called multiple times. All calls after first call will have no effect on its status.
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func (d *Instance) Close() error {
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d.access.Lock()
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defer d.access.Unlock()
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if d.closed {
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return nil
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}
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d.closed = true
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close(d.c)
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return nil
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}
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