7c9314f231
* swarm: propagate ctx, enable opentracing * swarm/tracing: log error when tracing is misconfigured
36 lines
1.4 KiB
Go
36 lines
1.4 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metrics
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// Factory creates new metrics
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type Factory interface {
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Counter(name string, tags map[string]string) Counter
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Timer(name string, tags map[string]string) Timer
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Gauge(name string, tags map[string]string) Gauge
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// Namespace returns a nested metrics factory.
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Namespace(name string, tags map[string]string) Factory
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}
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// NullFactory is a metrics factory that returns NullCounter, NullTimer, and NullGauge.
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var NullFactory Factory = nullFactory{}
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type nullFactory struct{}
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func (nullFactory) Counter(name string, tags map[string]string) Counter { return NullCounter }
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func (nullFactory) Timer(name string, tags map[string]string) Timer { return NullTimer }
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func (nullFactory) Gauge(name string, tags map[string]string) Gauge { return NullGauge }
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func (nullFactory) Namespace(name string, tags map[string]string) Factory { return NullFactory }
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