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opts.go
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opts.go
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// Copyright 2019 Anapaya Systems
//
// 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 healthpool
import "time"
// PoolOptions define the behavior of the pool.
type PoolOptions struct {
// Algorithm is the choosing algorithm. In case of the empty string,
// MinFailCount is used.
Algorithm Algorithm
// AllowEmpty indicates that the pool is allowed to be empty.
AllowEmpty bool
// Expire contains the expiration options.
Expire ExpireOptions
}
func (opts PoolOptions) algorithm(p *Pool) func() (Info, error) {
switch opts.Algorithm {
case "", MinFailCount:
return p.chooseMinFails
default:
return nil
}
}
const (
// MinFailCount selects a pool entry with the minimum fail count.
MinFailCount Algorithm = "MinFailCount"
)
// Algorithm is the choosing algorithm of the pool.
type Algorithm string
const (
// DefaultExpireStart is the the default for ExpireStart.
DefaultExpireStart = 5 * time.Minute
// DefaultExpireInterval is the default for ExpireInterval.
DefaultExpireInterval = 10 * time.Second
)
// ExpireOptions define the expiration behavior.
type ExpireOptions struct {
// Start is the time without failures for an info after which
// exponential fail expiration starts. In case of the zero value, the
// DefaultExpireStart is used.
Start time.Duration
// Interval is the time between exponential fail expirations.
// In case of the zero value, the DefaultExpireInterval is used.
Interval time.Duration
}
func (opts *ExpireOptions) start() time.Duration {
return defaultDur(opts.Start, DefaultExpireStart)
}
func (opts *ExpireOptions) interval() time.Duration {
return defaultDur(opts.Interval, DefaultExpireInterval)
}
func defaultDur(val, def time.Duration) time.Duration {
if val == 0 {
return def
}
return val
}