/
count.go
70 lines (57 loc) · 1.97 KB
/
count.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/core/typex"
"github.com/apache/beam/sdks/v2/go/pkg/beam/internal/errors"
)
// Count verifies the given PCollection<T> has the specified number of elements.
func Count(s beam.Scope, col beam.PCollection, name string, count int) {
s = s.Scope(fmt.Sprintf("passert.Count(%v)", name))
if typex.IsKV(col.Type()) {
col = beam.DropKey(s, col)
}
if count > 0 {
NonEmpty(s, col)
}
counted := beam.Combine(s, &elmCountCombineFn{}, col)
beam.ParDo0(s, &errFn{Name: name, Count: count}, counted)
}
type elmCountCombineFn struct {
}
func (f *elmCountCombineFn) CreateAccumulator() int {
return 0
}
func (f *elmCountCombineFn) AddInput(a int, _ beam.T) int {
return a + 1
}
func (f *elmCountCombineFn) MergeAccumulators(a, b int) int {
return a + b
}
func (f *elmCountCombineFn) ExtractOutput(a int) int {
return a
}
type errFn struct {
Name string `json:"name,omitempty"`
Count int `json:"count,omitempty"`
}
func (f *errFn) ProcessElement(count int) error {
if f.Count != count {
return errors.Errorf("passert.Count(%v) = %v, want %v", f.Name, count, f.Count)
}
return nil
}