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workerpool.go
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workerpool.go
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/**
* Copyright 2015 Comcast Cable Communications Management, LLC
*
* 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 jtl
import (
"strconv"
. "github.com/Comcast/eel/util"
)
// Worker is a worker in the pool
type Worker struct {
id int
work chan *WorkRequest
WorkerQueue chan chan *WorkRequest
quitChan chan bool
}
// WorkRequest is a work request
type WorkRequest struct {
Raw string
Event *JDoc
Ctx Context
}
// WorkDispatcher dispatches work requests to workers in the pool using channels
type WorkDispatcher struct {
WorkQueue chan *WorkRequest
WorkerQueue chan chan *WorkRequest
workers []*Worker
quitChan chan bool
tenant string
}
// NewWorker creates a new worker
func NewWorker(id int, workerQueue chan chan *WorkRequest) *Worker {
worker := Worker{
id: id,
work: make(chan *WorkRequest),
WorkerQueue: workerQueue,
quitChan: make(chan bool),
}
return &worker
}
func GetWorkDispatcher(ctx Context, tenantId string) *WorkDispatcher {
if ctx.Value(EelDispatcher+"_"+tenantId) != nil {
return ctx.Value(EelDispatcher + "_" + tenantId).(*WorkDispatcher)
} else if ctx.Value(EelDispatcher+"_") != nil {
// return default worker pool if there is no dedicated pool for this tenant
return ctx.Value(EelDispatcher + "_").(*WorkDispatcher)
} else {
ctx.Log().Error("error", "no_worker_pool_for_tenant", "tenant", tenantId)
}
return nil
}
// Start starts a worker which will then listen on its private channel for work requests
func (w *Worker) Start() {
go func() {
defer func() {
Mutex.RLock()
Gctx.HandlePanic()
Mutex.RUnlock()
}()
for {
w.WorkerQueue <- w.work
select {
case work := <-w.work:
stats := work.Ctx.Value(EelTotalStats).(*ServiceStats)
//w.ctx.Log.Info("action", "received_work", "id", strconv.Itoa(w.id))
handleEvent(work.Ctx, stats, work.Event, work.Raw, false, false)
//w.ctx.Log.Info("action", "handled_work", "id", strconv.Itoa(w.id))
case <-w.quitChan:
Gctx.Log().Info("action", "stopping_worker", "id", strconv.Itoa(w.id))
return
}
}
}()
}
// Stop stops a worker via quit channel
func (w *Worker) Stop() {
go func() {
defer Gctx.HandlePanic()
w.quitChan <- true
}()
}
// NewWorkDispatcher creates a new worker pool with nworkers workers and a work queue depth of queueDepth
func NewWorkDispatcher(nworkers int, queueDepth int, tenant string) *WorkDispatcher {
disp := new(WorkDispatcher)
disp.WorkQueue = make(chan *WorkRequest, queueDepth)
disp.WorkerQueue = make(chan chan *WorkRequest, nworkers)
disp.workers = make([]*Worker, nworkers)
disp.quitChan = make(chan bool)
disp.tenant = tenant
return disp
}
// Start starts the event loop of a new work dispatcher
func (disp *WorkDispatcher) Start(ctx Context) {
ctx.Log().Info("action", "starting_workers", "count", len(disp.workers), "tenant", disp.tenant)
for i := 0; i < len(disp.workers); i++ {
disp.workers[i] = NewWorker(i, disp.WorkerQueue)
disp.workers[i].Start()
}
go func() {
defer ctx.HandlePanic()
for {
select {
case work := <-disp.WorkQueue:
//ctx.Log().Info("action", "received_work_request", "tenant", disp.tenant)
//go func() {
worker := <-disp.WorkerQueue
//ctx.Log.Info("action", "dispatched_work_request")
worker <- work
//}()
case <-disp.quitChan:
return
}
}
}()
}
// Stop stops the worker pool
func (disp *WorkDispatcher) Stop(ctx Context) {
if disp.workers != nil && disp.quitChan != nil {
ctx.Log().Info("action", "stopping_workers", "count", len(disp.workers), "tenant", disp.tenant)
for _, w := range disp.workers {
w.Stop()
}
disp.quitChan <- true
}
}