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https://github.com/jolestar/go-commons-pool
a generic object pool for golang
https://github.com/jolestar/go-commons-pool
commons-pool golang objectpool
Last synced: 25 days ago
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a generic object pool for golang
- Host: GitHub
- URL: https://github.com/jolestar/go-commons-pool
- Owner: jolestar
- License: apache-2.0
- Created: 2015-12-28T14:26:23.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2023-05-30T21:57:20.000Z (over 1 year ago)
- Last Synced: 2024-10-01T14:23:39.227Z (about 1 month ago)
- Topics: commons-pool, golang, objectpool
- Language: Go
- Homepage:
- Size: 397 KB
- Stars: 1,222
- Watchers: 52
- Forks: 150
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
Go Commons Pool
=====
[](https://github.com/jolestar/go-commons-pool/actions)
[](https://codecov.io/gh/jolestar/go-commons-pool)
[](https://goreportcard.com/report/github.com/jolestar/go-commons-pool)
[](https://godoc.org/github.com/jolestar/go-commons-pool)
The Go Commons Pool is a generic object pool for [Golang](https://golang.org/), direct rewrite from [Apache Commons Pool](https://commons.apache.org/proper/commons-pool/).
Features
-------
1. Support custom [PooledObjectFactory](https://godoc.org/github.com/jolestar/go-commons-pool#PooledObjectFactory).
1. Rich pool configuration option, can precise control pooled object lifecycle. See [ObjectPoolConfig](https://godoc.org/github.com/jolestar/go-commons-pool#ObjectPoolConfig).
* Pool LIFO (last in, first out) or FIFO (first in, first out)
* Pool cap config
* Pool object validate config
* Pool object borrow block and max waiting time config
* Pool object eviction config
* Pool object abandon config
Pool Configuration Option
-------
Configuration option table, more detail description see [ObjectPoolConfig](https://godoc.org/github.com/jolestar/go-commons-pool#ObjectPoolConfig)
| Option | Default | Description |
| ------------------------------|:--------------:| :------------|
| LIFO | true |If pool is LIFO (last in, first out)|
| MaxTotal | 8 |The cap of pool|
| MaxIdle | 8 |Max "idle" instances in the pool |
| MinIdle | 0 |Min "idle" instances in the pool |
| TestOnCreate | false |Validate when object is created|
| TestOnBorrow | false |Validate when object is borrowed|
| TestOnReturn | false |Validate when object is returned|
| TestWhileIdle | false |Validate when object is idle, see TimeBetweenEvictionRuns |
| BlockWhenExhausted | true |Whether to block when the pool is exhausted |
| MinEvictableIdleTime | 30m |Eviction configuration,see DefaultEvictionPolicy |
| SoftMinEvictableIdleTime | math.MaxInt64 |Eviction configuration,see DefaultEvictionPolicy |
| NumTestsPerEvictionRun | 3 |The maximum number of objects to examine during each run evictor goroutine |
| TimeBetweenEvictionRuns | 0 |The number of milliseconds to sleep between runs of the evictor goroutine, less than 1 mean not run |
Usage
-------
### Use Simple Factory
```go
import (
"context"
"fmt"
"strconv"
"sync/atomic"
"github.com/jolestar/go-commons-pool/v2"
)
func Example_simple() {
type myPoolObject struct {
s string
}
v := uint64(0)
factory := pool.NewPooledObjectFactorySimple(
func(context.Context) (interface{}, error) {
return &myPoolObject{
s: strconv.FormatUint(atomic.AddUint64(&v, 1), 10),
},
nil
})
ctx := context.Background()
p := pool.NewObjectPoolWithDefaultConfig(ctx, factory)
obj, err := p.BorrowObject(ctx)
if err != nil {
panic(err)
}
o := obj.(*myPoolObject)
fmt.Println(o.s)
err = p.ReturnObject(ctx, obj)
if err != nil {
panic(err)
}
// Output: 1
}
```
### Use Custom Factory
```go
import (
"context"
"fmt"
"strconv"
"sync/atomic"
"github.com/jolestar/go-commons-pool/v2"
)
type MyPoolObject struct {
s string
}
type MyCustomFactory struct {
v uint64
}
func (f *MyCustomFactory) MakeObject(ctx context.Context) (*pool.PooledObject, error) {
return pool.NewPooledObject(
&MyPoolObject{
s: strconv.FormatUint(atomic.AddUint64(&f.v, 1), 10),
}),
nil
}
func (f *MyCustomFactory) DestroyObject(ctx context.Context, object *pool.PooledObject) error {
// do destroy
return nil
}
func (f *MyCustomFactory) ValidateObject(ctx context.Context, object *pool.PooledObject) bool {
// do validate
return true
}
func (f *MyCustomFactory) ActivateObject(ctx context.Context, object *pool.PooledObject) error {
// do activate
return nil
}
func (f *MyCustomFactory) PassivateObject(ctx context.Context, object *pool.PooledObject) error {
// do passivate
return nil
}
func Example_customFactory() {
ctx := context.Background()
p := pool.NewObjectPoolWithDefaultConfig(ctx, &MyCustomFactory{})
p.Config.MaxTotal = 100
obj1, err := p.BorrowObject(ctx)
if err != nil {
panic(err)
}
o := obj1.(*MyPoolObject)
fmt.Println(o.s)
err = p.ReturnObject(ctx, obj1)
if err != nil {
panic(err)
}
// Output: 1
}
```
For more examples please see `pool_test.go` and `example_simple_test.go`, `example_customFactory_test.go`.
Note
-------
PooledObjectFactory.MakeObject must return a pointer, not value.
The following code will complain error.
```golang
p := pool.NewObjectPoolWithDefaultConfig(ctx, pool.NewPooledObjectFactorySimple(
func(context.Context) (interface{}, error) {
return "hello", nil
}))
obj, _ := p.BorrowObject()
p.ReturnObject(obj)
```
The right way is:
```golang
p := pool.NewObjectPoolWithDefaultConfig(ctx, pool.NewPooledObjectFactorySimple(
func(context.Context) (interface{}, error) {
s := "hello"
return &s, nil
}))
```
For more examples please see `example_simple_test.go`.
Dependency
-------
* [testify](https://github.com/stretchr/testify) for test
PerformanceTest
-------
The results of running the pool_perf_test is almost equal to the java version [PerformanceTest](https://github.com/apache/commons-pool/blob/trunk/src/test/java/org/apache/commons/pool2/performance/PerformanceTest.java)
go test --perf=true
For Apache commons pool user
-------
* Direct use pool.Config.xxx to change pool config
* Default config value is same as java version
* If TimeBetweenEvictionRuns changed after ObjectPool created, should call **ObjectPool.StartEvictor** to take effect. Java version do this on set method.
* No KeyedObjectPool (TODO)
* No ProxiedObjectPool
* No pool stats (TODO)
FAQ
-------
[FAQ](https://github.com/jolestar/go-commons-pool/wiki/FAQ)
How to contribute
-------
* Choose one open issue you want to solve, if not create one and describe what you want to change.
* Fork the repository on GitHub.
* Write code to solve the issue.
* Create PR and link to the issue.
* Make sure test and coverage pass.
* Wait maintainers to merge.
中文文档
-------
* [Go Commons Pool发布以及Golang多线程编程问题总结](http://jolestar.com/go-commons-pool-and-go-concurrent/)
* [Go Commons Pool 1.0 发布](http://jolestar.com/go-commons-pool-v1-release/)
License
-------
Go Commons Pool is available under the [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0.html).