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pool.go
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pool.go
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// Copyright 2013-2015 Aerospike, Inc.
//
// Licensed 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 types
import (
. "github.com/aerospike/aerospike-client-go/types/atomic"
)
// Pool implements a general purpose fixed-size pool.
type Pool struct {
pool *AtomicQueue
// New will create a new object
New func(params ...interface{}) interface{}
// IsUsable checks if the object polled from the pool is still fresh and usable
IsUsable func(obj interface{}, params ...interface{}) bool
// CanReturn checkes if the object is eligible to go back to the pool
CanReturn func(obj interface{}) bool
// Finalize will be called when an object is not eligible to go back to the pool.
// Usable to close connections, file handles, ...
Finalize func(obj interface{})
}
// NewPool creates a new fixed size pool.
func NewPool(poolSize int) *Pool {
return &Pool{
pool: NewAtomicQueue(poolSize),
}
}
// Get returns an element from the pool.
// If the pool is empty, or the returned element is not usable,
// nil or the result of the New function will be returned
func (bp *Pool) Get(params ...interface{}) interface{} {
res := bp.pool.Poll()
if res == nil || (bp.IsUsable != nil && !bp.IsUsable(res, params...)) {
// not usable, so finalize
if res != nil && bp.Finalize != nil {
bp.Finalize(res)
}
if bp.New != nil {
res = bp.New(params...)
}
}
return res
}
// Put will add the elem back to the pool, unless the pool is full.
func (bp *Pool) Put(obj interface{}) {
finalize := true
if bp.CanReturn == nil || bp.CanReturn(obj) {
finalize = !bp.pool.Offer(obj)
}
if finalize && bp.Finalize != nil {
bp.Finalize(obj)
}
}