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strategy.go
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strategy.go
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/*
http://www.apache.org/licenses/LICENSE-2.0.txt
Copyright 2015 Intel Corporation
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 strategy provides basic interfaces for routing to available
// plugins and caching metric data.
package strategy
import (
"errors"
"time"
"github.com/intelsdi-x/snap/core"
)
var (
ErrCouldNotSelect = errors.New("could not select a plugin")
)
type SelectablePlugin interface {
HitCount() int
LastHit() time.Time
String() string
Kill(r string) error
ID() uint32
}
type RoutingAndCaching interface {
Select(selectablePlugins []SelectablePlugin, taskID string) (SelectablePlugin, error)
Remove(selectablePlugins []SelectablePlugin, taskID string) (SelectablePlugin, error)
CheckCache(metrics []core.Metric, taskID string) ([]core.Metric, []core.Metric)
UpdateCache(metrics []core.Metric, taskID string)
CacheHits(ns string, ver int, taskID string) (uint64, error)
CacheMisses(ns string, ver int, taskID string) (uint64, error)
AllCacheHits() uint64
AllCacheMisses() uint64
CacheTTL(taskID string) (time.Duration, error)
String() string
}