The Go Commons Pool is a generic object pool for Golang, direct rewrite from Apache Commons Pool.
- Support custom PooledObjectFactory.
- Rich pool configuration option, can precise control pooled object lifecycle. see 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
Configuration option table, more detail description see 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 TimeBetweenEvictionRunsMillis |
| BlockWhenExhausted | true | Whether to block when the pool is exhausted |
| MaxWaitMillis | -1 | Max block time, less than 0 mean indefinitely |
| MinEvictableIdleTimeMillis | 1000 * 60 * 30 | Eviction configuration,see DefaultEvictionPolicy |
| SoftMinEvictableIdleTimeMillis | math.MaxInt64 | Eviction configuration,see DefaultEvictionPolicy |
| NumTestsPerEvictionRun | 3 | The maximum number of objects to examine during each run evictor goroutine |
| TimeBetweenEvictionRunsMillis | -1 | The number of milliseconds to sleep between runs of the evictor goroutine, less than 0 mean not run |
import "github.com/jolestar/go-commons-pool"
//use create func
p := pool.NewObjectPoolWithDefaultConfig(pool.NewPooledObjectFactorySimple(
func() (interface{}, error) {
return &MyPoolObject{}, nil
}))
obj, _ := p.BorrowObject()
p.ReturnObject(obj)
//use custom Object factory
type MyObjectFactory struct {
}
func (f *MyObjectFactory) MakeObject() (*pool.PooledObject, error) {
return pool.NewPooledObject(&MyPoolObject{}), nil
}
func (f *MyObjectFactory) DestroyObject(object *PooledObject) error {
//do destroy
return nil
}
func (f *MyObjectFactory) ValidateObject(object *pool.PooledObject) bool {
//do validate
return true
}
func (f *MyObjectFactory) ActivateObject(object *pool.PooledObject) error {
//do activate
return nil
}
func (f *MyObjectFactory) PassivateObject(object *pool.PooledObject) error {
//do passivate
return nil
}
p := pool.NewObjectPoolWithDefaultConfig(new(MyObjectFactory))
p.Config.MaxTotal = 100
obj, _ := p.BorrowObject()
p.ReturnObject(obj)
more example please see pool_test.go and example_test.go
PooledObjectFactory.MakeObject must return a pointer, not value. The following code will complain error.
p := pool.NewObjectPoolWithDefaultConfig(pool.NewPooledObjectFactorySimple(
func() (interface{}, error) {
return "hello", nil
}))
obj, _ := p.BorrowObject()
p.ReturnObject(obj)
The right way is:
p := pool.NewObjectPoolWithDefaultConfig(pool.NewPooledObjectFactorySimple(
func() (interface{}, error) {
var stringPointer = new(string)
*stringPointer = "hello"
return stringPointer, nil
}))
more example please see example_test.go
- testify for test
The results of running the pool_perf_test is almost equal to the java version PerformanceTest
go test --perf=true
- Direct use pool.Config.xxx to change pool config
- Default config value is same as java version
- If TimeBetweenEvictionRunsMillis 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)
- 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.
Go Commons Pool is available under the Apache License, Version 2.0.
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