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cluster_client_get_batch.go
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/
cluster_client_get_batch.go
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package vs
import (
"github.com/chrislusf/vasto/pb"
)
type answer struct {
keyValues []*KeyValue
err error
}
// BatchGet gets the key value pairs from different partitions by the keys
func (c *ClusterClient) BatchGet(keys []*KeyObject) (ret []*KeyValue, err error) {
var requests []*pb.Request
for _, key := range keys {
request := &pb.Request{
Get: &pb.GetRequest{
Key: key.GetKey(),
PartitionHash: key.GetPartitionHash(),
},
}
requests = append(requests, request)
}
outputChan := make(chan *answer, len(keys))
go func() {
err = c.BatchProcess(requests, func(responses []*pb.Response, err error) error {
if err != nil {
outputChan <- &answer{err: err}
return nil
}
var output []*KeyValue
for _, response := range responses {
kv := fromPbKeyTypeValue(response.Get.KeyValue)
output = append(output, kv)
}
outputChan <- &answer{keyValues: output}
return nil
})
close(outputChan)
}()
for ans := range outputChan {
if ans.err != nil {
return nil, ans.err
}
ret = append(ret, ans.keyValues...)
}
return ret, err
}