forked from apache/pulsar-client-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
negative_backoff_policy.go
46 lines (39 loc) · 1.81 KB
/
negative_backoff_policy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 pulsar
import "math"
// NackBackoffPolicy is a interface for custom message negativeAcked policy, users can specify a NackBackoffPolicy
// for a consumer.
//
// > Notice: the consumer crashes will trigger the redelivery of the unacked message, this case will not respect the
// > NackBackoffPolicy, which means the message might get redelivered earlier than the delay time
// > from the backoff.
type NackBackoffPolicy interface {
// The redeliveryCount indicates the number of times the message was redelivered.
// We can get the redeliveryCount from the CommandMessage.
Next(redeliveryCount uint32) int64
}
// defaultNackBackoffPolicy is default impl for NackBackoffPolicy.
type defaultNackBackoffPolicy struct{}
func (nbp *defaultNackBackoffPolicy) Next(redeliveryCount uint32) int64 {
minNackTimeMs := int64(1000 * 30) // 30sec
maxNackTimeMs := 1000 * 60 * 10 // 10min
if redeliveryCount < 0 {
return minNackTimeMs
}
return int64(math.Min(math.Abs(float64(minNackTimeMs<<redeliveryCount)), float64(maxNackTimeMs)))
}