examples_test.go

Documentation: go.opencensus.io/metric

     1  // Copyright 2018, OpenCensus Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package metric_test
    16  
    17  import (
    18  	"net/http"
    19  
    20  	"go.opencensus.io/metric"
    21  	"go.opencensus.io/metric/metricdata"
    22  )
    23  
    24  func ExampleRegistry_AddInt64Gauge() {
    25  	r := metric.NewRegistry()
    26  	// TODO: allow exporting from a registry
    27  
    28  	g, _ := r.AddInt64Gauge("active_request",
    29  		metric.WithDescription("Number of active requests, per method."),
    30  		metric.WithUnit(metricdata.UnitDimensionless),
    31  		metric.WithLabelKeys("method"))
    32  
    33  	http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
    34  		e, _ := g.GetEntry(metricdata.NewLabelValue(request.Method))
    35  		e.Add(1)
    36  		defer e.Add(-1)
    37  		// process request ...
    38  	})
    39  }
    40
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