/
sum.go
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/
sum.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package passert
import (
"fmt"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/internal/errors"
)
// Sum validates that the sum and count of elements in the incoming PCollection<int> is
// the same as the given sum and count, under coder equality. Sum is a specialized version of Equals
// that avoids a lot of machinery for testing.
func Sum(s beam.Scope, col beam.PCollection, name string, size, value int) {
s = s.Scope(fmt.Sprintf("passert.Sum(%v)", name))
keyed := beam.AddFixedKey(s, col)
grouped := beam.GroupByKey(s, keyed)
beam.ParDo0(s, &sumFn{Name: name, Size: size, Sum: value}, grouped)
}
type sumFn struct {
Name string `json:"name,omitempty"`
Size int `json:"size,omitempty"`
Sum int `json:"sum,omitempty"`
}
func (f *sumFn) ProcessElement(_ int, values func(*int) bool) error {
var sum, count, i int
for values(&i) {
count++
sum += i
}
if f.Sum != sum || f.Size != count {
return errors.Errorf("passert.Sum(%v) = {%v, size: %v}, want {%v, size:%v}", f.Name, sum, count, f.Sum, f.Size)
}
return nil
}