github.com/vmware/govmomi@v0.43.0/vim25/types/json_bench_test.go (about)

     1  /*
     2  Copyright (c) 2023-2023 VMware, Inc. All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package types
    18  
    19  import (
    20  	"bytes"
    21  	"os"
    22  	"testing"
    23  
    24  	"github.com/vmware/govmomi/vim25/json"
    25  )
    26  
    27  // BenchmarkDecodeVirtualMachineConfigInfo illustrates the performance
    28  // difference between decoding a large vminfo object when the type
    29  // discriminator is the first property in the object versus the last
    30  // property.
    31  func BenchmarkDecodeVirtualMachineConfigInfo(b *testing.B) {
    32  
    33  	testCases := []struct {
    34  		name string
    35  		path string
    36  	}{
    37  		{
    38  			name: "vm info w type name first",
    39  			path: "./testdata/vminfo.json",
    40  		},
    41  		{
    42  			name: "vm info w type name last",
    43  			path: "./testdata/vminfo-typename-at-end.json",
    44  		},
    45  	}
    46  
    47  	for _, tc := range testCases {
    48  		tc := tc // capture the range variable
    49  		b.Run(tc.name, func(b *testing.B) {
    50  			buf, err := os.ReadFile(tc.path)
    51  			if err != nil {
    52  				b.Fatal(err)
    53  			}
    54  
    55  			b.ResetTimer()
    56  
    57  			for i := 0; i < b.N; i++ {
    58  
    59  				dec := json.NewDecoder(bytes.NewReader(buf))
    60  				dec.SetDiscriminator(
    61  					"_typeName", "_value",
    62  					json.DiscriminatorToTypeFunc(TypeFunc()),
    63  				)
    64  
    65  				var obj interface{}
    66  				if err := dec.Decode(&obj); err != nil {
    67  					b.Fatal(err)
    68  				}
    69  			}
    70  		})
    71  	}
    72  }