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a3ae50d8bc
* Remove globals from exp/streaming * basic example * Build the streaming example * Update README.md for running streaming example * Remove observer package * Move observer to exporter * Fix * Re-run make circle-ci
75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
// Copyright 2019, OpenTelemetry 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 buffer
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import (
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/experimental/streaming/exporter"
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)
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type Buffer struct {
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observers []exporter.Observer
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events chan exporter.Event
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dropped uint64
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wait sync.WaitGroup
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close chan struct{}
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}
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func NewBuffer(size int, observers ...exporter.Observer) *Buffer {
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b := &Buffer{
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observers: observers,
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events: make(chan exporter.Event, size),
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close: make(chan struct{}),
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}
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b.wait.Add(1)
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go b.run()
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return b
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}
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func (b *Buffer) Observe(data exporter.Event) {
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select {
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case b.events <- data:
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default:
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atomic.AddUint64(&b.dropped, 1)
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}
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}
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func (b *Buffer) Close() {
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close(b.close)
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b.wait.Wait()
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}
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func (b *Buffer) run() {
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defer func() {
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_ = recover()
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b.wait.Done()
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}()
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for {
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select {
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case <-b.close:
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return
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case ev := <-b.events:
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// TODO: This has to ensure ordered arrival,
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// e.g., put into a heap and delay observations.
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for _, obs := range b.observers {
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obs.Observe(ev)
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}
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}
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}
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}
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