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closable_pool.go
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closable_pool.go
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/*
Copyright (c) 2014 Ashley Jeffs
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package util
import (
"sort"
"time"
"github.com/jeffail/benthos/lib/types"
)
//--------------------------------------------------------------------------------------------------
// ClosablePool - Keeps a reference to a pool of closable types and closes them in tiers.
type ClosablePool struct {
closables map[int][]types.Closable
}
// NewClosablePool - Create a fresh pool of closable types.
func NewClosablePool() *ClosablePool {
return &ClosablePool{
closables: make(map[int][]types.Closable),
}
}
//--------------------------------------------------------------------------------------------------
/*
Add - Adds a closable type to the pool, tiers are used to partition and order the closing of types
(starting at the lowest tier and working upwards). Closable types in a single tier are closed in the
order that they are added.
*/
func (c *ClosablePool) Add(tier int, closable types.Closable) {
tierArray := []types.Closable{}
if t, ok := c.closables[tier]; ok {
tierArray = t
}
c.closables[tier] = append(tierArray, closable)
}
/*
Close - Attempt to close and clean up all stored closables in the determined order. If the timeout
is met whilst working through the pool there is no indication of how far the pool has been
progressed, thus this timeout should only be used for preventing severe blocking of a service.
*/
func (c *ClosablePool) Close(timeout time.Duration) error {
started := time.Now()
tiers := []int{}
for i := range c.closables {
tiers = append(tiers, i)
}
sort.Ints(tiers)
for _, i := range tiers {
tier := c.closables[i]
for j := range tier {
tier[j].CloseAsync()
}
for j := range tier {
if err := tier[j].WaitForClose(timeout - time.Since(started)); err != nil {
return err
}
}
delete(c.closables, i)
}
return nil
}
//--------------------------------------------------------------------------------------------------