forked from intelsdi-x/snap
/
watcher.go
203 lines (183 loc) · 5.55 KB
/
watcher.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 scheduler
import (
"sync"
log "github.com/Sirupsen/logrus"
"github.com/intelsdi-x/snap/core"
)
var (
watcherLog = log.WithField("_module", "scheduler-watcher")
)
// TaskWatcher struct type
type TaskWatcher struct {
id uint64
taskIDs []string
parent *taskWatcherCollection
stopped bool
handler core.TaskWatcherHandler
}
// Close stops watching a task. Cannot be restarted.
func (t *TaskWatcher) Close() error {
for _, x := range t.taskIDs {
t.parent.rm(x, t)
}
return nil
}
type taskWatcherCollection struct {
// Collection of task watchers by
coll map[string][]*TaskWatcher
tIDCounter uint64
mutex *sync.Mutex
}
func newTaskWatcherCollection() *taskWatcherCollection {
return &taskWatcherCollection{
coll: make(map[string][]*TaskWatcher),
tIDCounter: 1,
mutex: &sync.Mutex{},
}
}
func (t *taskWatcherCollection) rm(taskID string, tw *TaskWatcher) {
t.mutex.Lock()
defer t.mutex.Unlock()
if t.coll[taskID] != nil {
for i, w := range t.coll[taskID] {
if w == tw {
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": tw.id,
}).Debug("removing watch from task")
t.coll[taskID] = append(t.coll[taskID][:i], t.coll[taskID][i+1:]...)
if len(t.coll[taskID]) == 0 {
delete(t.coll, taskID)
}
}
}
}
}
func (t *taskWatcherCollection) add(taskID string, twh core.TaskWatcherHandler) (*TaskWatcher, error) {
t.mutex.Lock()
defer t.mutex.Unlock()
// init map for task ID if it does not eist
if t.coll[taskID] == nil {
t.coll[taskID] = make([]*TaskWatcher, 0)
}
tw := &TaskWatcher{
// Assign unique ID to task watcher
id: t.tIDCounter,
// Add ref to coll for cleanup later
parent: t,
stopped: false,
handler: twh,
}
// Increment number for next time
t.tIDCounter++
// Add task id to task watcher list
tw.taskIDs = append(tw.taskIDs, taskID)
// Add this task watcher in
t.coll[taskID] = append(t.coll[taskID], tw)
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": tw.id,
}).Debug("Added to task watcher collection")
return tw, nil
}
func (t *taskWatcherCollection) handleMetricCollected(taskID string, m []core.Metric) {
t.mutex.Lock()
defer t.mutex.Unlock()
// no taskID means no watches, early exit
if t.coll[taskID] == nil || len(t.coll[taskID]) == 0 {
// Uncomment this debug line if needed. Otherwise this is too verbose for even debug level.
// watcherLog.WithFields(log.Fields{
// "task-id": taskId,
// }).Debug("no watchers")
return
}
// Walk all watchers for a task ID
for _, v := range t.coll[taskID] {
// Check if they have a catcher assigned
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": v.id,
}).Debug("calling taskwatcher collection func")
// Call the catcher
v.handler.CatchCollection(m)
}
}
func (t *taskWatcherCollection) handleTaskStarted(taskID string) {
t.mutex.Lock()
defer t.mutex.Unlock()
// no taskID means no watches, early exit
if t.coll[taskID] == nil || len(t.coll[taskID]) == 0 {
// Uncomment this debug line if needed. Otherwise this is too verbose for even debug level.
// watcherLog.WithFields(log.Fields{
// "task-id": taskID,
// }).Debug("no watchers")
return
}
// Walk all watchers for a task ID
for _, v := range t.coll[taskID] {
// Check if they have a catcher assigned
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": v.id,
}).Debug("calling taskwatcher task started func")
// Call the catcher
v.handler.CatchTaskStarted()
}
}
func (t *taskWatcherCollection) handleTaskStopped(taskID string) {
t.mutex.Lock()
defer t.mutex.Unlock()
// no taskID means no watches, early exit
if t.coll[taskID] == nil || len(t.coll[taskID]) == 0 {
// Uncomment this debug line if needed. Otherwise this is too verbose for even debug level.
// watcherLog.WithFields(log.Fields{
// "task-id": taskId,
// }).Debug("no watchers")
return
}
// Walk all watchers for a task ID
for _, v := range t.coll[taskID] {
// Check if they have a catcher assigned
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": v.id,
}).Debug("calling taskwatcher task stopped func")
// Call the catcher
v.handler.CatchTaskStopped()
}
}
func (t *taskWatcherCollection) handleTaskDisabled(taskID string, why string) {
t.mutex.Lock()
defer t.mutex.Unlock()
// no taskID means no watches, early exit
if t.coll[taskID] == nil || len(t.coll[taskID]) == 0 {
// Uncomment this debug line if needed. Otherwise this is too verbose for even debug level.
// watcherLog.WithFields(log.Fields{
// "task-id": taskID,
// }).Debug("no watchers")
return
}
// Walk all watchers for a task ID
for _, v := range t.coll[taskID] {
// Check if they have a catcher assigned
watcherLog.WithFields(log.Fields{
"task-id": taskID,
"task-watcher-id": v.id,
}).Debug("calling taskwatcher task disabled func")
// Call the catcher
v.handler.CatchTaskDisabled(why)
}
}