100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
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// Copyright (c) 2018 The Jaeger Authors.
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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 remote
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import (
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"time"
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"github.com/uber/jaeger-client-go"
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)
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const (
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defaultHostPort = "localhost:5778"
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defaultRefreshInterval = time.Second * 5
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)
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// Option is a function that sets some option on the Throttler
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type Option func(options *options)
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// Options is a factory for all available options
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var Options options
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type options struct {
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metrics *jaeger.Metrics
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logger jaeger.Logger
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hostPort string
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refreshInterval time.Duration
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synchronousInitialization bool
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}
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// Metrics creates an Option that initializes Metrics on the Throttler, which is used to emit statistics.
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func (options) Metrics(m *jaeger.Metrics) Option {
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return func(o *options) {
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o.metrics = m
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}
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}
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// Logger creates an Option that sets the logger used by the Throttler.
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func (options) Logger(logger jaeger.Logger) Option {
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return func(o *options) {
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o.logger = logger
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}
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}
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// HostPort creates an Option that sets the hostPort of the local agent that keeps track of credits.
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func (options) HostPort(hostPort string) Option {
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return func(o *options) {
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o.hostPort = hostPort
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}
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}
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// RefreshInterval creates an Option that sets how often the Throttler will poll local agent for
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// credits.
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func (options) RefreshInterval(refreshInterval time.Duration) Option {
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return func(o *options) {
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o.refreshInterval = refreshInterval
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}
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}
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// SynchronousInitialization creates an Option that determines whether the throttler should synchronously
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// fetch credits from the agent when an operation is seen for the first time. This should be set to true
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// if the client will be used by a short lived service that needs to ensure that credits are fetched upfront
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// such that sampling or throttling occurs.
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func (options) SynchronousInitialization(b bool) Option {
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return func(o *options) {
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o.synchronousInitialization = b
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}
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}
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func applyOptions(o ...Option) options {
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opts := options{}
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for _, option := range o {
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option(&opts)
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}
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if opts.metrics == nil {
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opts.metrics = jaeger.NewNullMetrics()
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}
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if opts.logger == nil {
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opts.logger = jaeger.NullLogger
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}
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if opts.hostPort == "" {
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opts.hostPort = defaultHostPort
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}
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if opts.refreshInterval == 0 {
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opts.refreshInterval = defaultRefreshInterval
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}
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return opts
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}
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