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Copy expvar metrics implementation from jaeger-lib (jaegertracing#3772)
Signed-off-by: Albert Teoh <see.kwang.teoh@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // Copyright (c) 2022 The Jaeger Authors. | ||
| // Copyright (c) 2018 Uber Technologies, Inc. | ||
| // | ||
| // Licensed 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 expvar | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/jaegertracing/jaeger/pkg/metrics" | ||
| ) | ||
|
|
||
| type cache struct { | ||
| lock sync.Mutex | ||
| counters map[string]metrics.Counter | ||
| gauges map[string]metrics.Gauge | ||
| timers map[string]metrics.Timer | ||
| histograms map[string]metrics.Histogram | ||
| } | ||
|
|
||
| func newCache() *cache { | ||
| return &cache{ | ||
| counters: make(map[string]metrics.Counter), | ||
| gauges: make(map[string]metrics.Gauge), | ||
| timers: make(map[string]metrics.Timer), | ||
| histograms: make(map[string]metrics.Histogram), | ||
| } | ||
| } | ||
|
|
||
| func (r *cache) getOrSetCounter(name string, create func() metrics.Counter) metrics.Counter { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
| c, ok := r.counters[name] | ||
| if !ok { | ||
| c = create() | ||
| r.counters[name] = c | ||
| } | ||
| return c | ||
| } | ||
|
|
||
| func (r *cache) getOrSetGauge(name string, create func() metrics.Gauge) metrics.Gauge { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
| g, ok := r.gauges[name] | ||
| if !ok { | ||
| g = create() | ||
| r.gauges[name] = g | ||
| } | ||
| return g | ||
| } | ||
|
|
||
| func (r *cache) getOrSetTimer(name string, create func() metrics.Timer) metrics.Timer { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
| t, ok := r.timers[name] | ||
| if !ok { | ||
| t = create() | ||
| r.timers[name] = t | ||
| } | ||
| return t | ||
| } | ||
|
|
||
| func (r *cache) getOrSetHistogram(name string, create func() metrics.Histogram) metrics.Histogram { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
| t, ok := r.histograms[name] | ||
| if !ok { | ||
| t = create() | ||
| r.histograms[name] = t | ||
| } | ||
| return t | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // Copyright (c) 2022 The Jaeger Authors. | ||
| // Copyright (c) 2018 Uber Technologies, Inc. | ||
| // | ||
| // Licensed 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 expvar | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
|
|
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| "github.com/jaegertracing/jaeger/internal/metricstest" | ||
| "github.com/jaegertracing/jaeger/pkg/metrics" | ||
| ) | ||
|
|
||
| func TestCache(t *testing.T) { | ||
| f := metricstest.NewFactory(100 * time.Second) | ||
| c1 := f.Counter(metrics.Options{Name: "x"}) | ||
| g1 := f.Gauge(metrics.Options{Name: "y"}) | ||
| t1 := f.Timer(metrics.TimerOptions{Name: "z"}) | ||
| h1 := f.Histogram(metrics.HistogramOptions{Name: "h"}) | ||
|
|
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| c := newCache() | ||
|
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| c2 := c.getOrSetCounter("x", func() metrics.Counter { return c1 }) | ||
| assert.Equal(t, c1, c2) | ||
| g2 := c.getOrSetGauge("y", func() metrics.Gauge { return g1 }) | ||
| assert.Equal(t, g1, g2) | ||
| t2 := c.getOrSetTimer("z", func() metrics.Timer { return t1 }) | ||
| assert.Equal(t, t1, t2) | ||
| h2 := c.getOrSetHistogram("h", func() metrics.Histogram { return h1 }) | ||
| assert.Equal(t, h1, h2) | ||
|
|
||
| c3 := c.getOrSetCounter("x", func() metrics.Counter { panic("c1") }) | ||
| assert.Equal(t, c1, c3) | ||
| g3 := c.getOrSetGauge("y", func() metrics.Gauge { panic("g1") }) | ||
| assert.Equal(t, g1, g3) | ||
| t3 := c.getOrSetTimer("z", func() metrics.Timer { panic("t1") }) | ||
| assert.Equal(t, t1, t3) | ||
| h3 := c.getOrSetHistogram("h", func() metrics.Histogram { panic("h1") }) | ||
| assert.Equal(t, h1, h3) | ||
| } |
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