go.temporal.io/server/common/effect/buffer.go
52 LOC · 24 covered · 28 uncovered · 8 ranges · 210 concepts · 6 introducers · 121 tests
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package effect
import "context"
// Buffer holds a set of effect and rollback functions that can be invoked as a
// batch with a defined order. Once either Apply or Cancel is called, all
// buffered effects are cleared. This type is not threadsafe. The zero-value of
// a Buffer is a valid state.
type Buffer struct {
effects []func(context.Context)
cancels []func(context.Context)
}
// OnAfterCommit adds the provided effect function to set of such functions to
// be invoked when Buffer.Apply is called.
b.effects = append(b.effects, effect)
}
// OnAfterRollback adds the provided effect function to set of such functions to
// be invoked when Buffer.Cancel is called.
b.cancels = append(b.cancels, effect)
}
// Apply invokes the buffered effect functions in the order that they were added
// to this Buffer.
// It returns true if any effects were applied.
applied := false
b.cancels = nil
for _, effect := range b.effects {
applied = true
}
return applied
}
// Cancel invokes the buffered rollback functions in the reverse of the order
// that they were added to this Buffer.
// It returns true if any effects were canceled.
canceled := false
b.effects = nil
for i := len(b.cancels) - 1; i >= 0; i-- {
canceled = true
}
return canceled
}