30 lines
945 B
Go
30 lines
945 B
Go
package internal
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// This file implements hooks for applying datastore transactions.
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import (
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"reflect"
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"github.com/golang/protobuf/proto"
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pb "google.golang.org/appengine/internal/datastore"
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)
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var transactionSetters = make(map[reflect.Type]reflect.Value)
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// RegisterTransactionSetter registers a function that sets transaction information
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// in a protocol buffer message. f should be a function with two arguments,
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// the first being a protocol buffer type, and the second being *datastore.Transaction.
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func RegisterTransactionSetter(f interface{}) {
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v := reflect.ValueOf(f)
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transactionSetters[v.Type().In(0)] = v
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}
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// ApplyTransaction applies the transaction t to message pb
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// by using the relevant setter passed to RegisterTransactionSetter.
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func ApplyTransaction(pb proto.Message, t *pb.Transaction) {
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v := reflect.ValueOf(pb)
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if f, ok := transactionSetters[v.Type()]; ok {
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f.Call([]reflect.Value{v, reflect.ValueOf(t)})
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}
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}
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