a better doc

gearman.go

@@ -11,8 +11,8 @@ and getting responses from the server.
 
 	import "github.com/mikespook/gearman-go/client"
 
-The worker package will help developers in developing Gearman worker
+The worker package will help developers to develop Gearman's worker
-service easily.
+in an easy way.
 
 	import "github.com/mikespook/gearman-go/worker"
 */

worker/worker.go

@@ -1,3 +1,5 @@
+// The worker package helps developers to develop Gearman's worker
+// in an easy way.
 package worker
 
 import (
@@ -14,24 +16,8 @@ const (
 	Immediately = 0
 )
 
-/*
+// Worker is the only structure needed by worker side developing.
-Worker side api for gearman
+// It can connect to multi-server and grab jobs.
-
-usage:
-w = worker.New(worker.Unlimited)
-w.AddFunction("foobar", foobar)
-w.AddServer("127.0.0.1:4730")
-w.Work() // Enter the worker's main loop
-
-The definition of the callback function 'foobar' should suit for the type 'JobFunction'.
-It looks like this:
-
-func foobar(job *Job) (data []byte, err os.Error) {
-    //sth. here
-    //plaplapla...
-    return
-}
-*/
 type Worker struct {
 	sync.Mutex
 	agents  []*agent
@@ -39,14 +25,19 @@ type Worker struct {
 	in      chan *inPack
 	running bool
 
-	Id string
+	Id           string
-	// assign a ErrFunc to handle errors
 	ErrorHandler ErrorHandler
 	JobHandler   JobHandler
 	limit        chan bool
 }
 
-// Get a new worker
+// Return a worker.
+//
+// If limit is set to Unlimited(=0), the worker will grab all jobs
+// and execute them parallelly.
+// If limit is greater than zero, the number of paralled executing
+// jobs are limited under the number. If limit is assgined to
+// OneByOne(=1), there will be only one job executed in a time.
 func New(limit int) (worker *Worker) {
 	worker = &Worker{
 		agents: make([]*agent, 0, limit),
@@ -59,15 +50,16 @@ func New(limit int) (worker *Worker) {
 	return
 }
 
-//
+// inner error handling
 func (worker *Worker) err(e error) {
 	if worker.ErrorHandler != nil {
 		worker.ErrorHandler(e)
 	}
 }
 
-// Add a server. The addr should be 'host:port' format.
+// Add a Gearman job server.
-// The connection is established at this time.
+//
+// addr should be formated as 'host:port'.
 func (worker *Worker) AddServer(net, addr string) (err error) {
 	// Create a new job server's client as a agent of server
 	a, err := newAgent(net, addr, worker)
@@ -78,9 +70,7 @@ func (worker *Worker) AddServer(net, addr string) (err error) {
 	return
 }
 
-// Write a job to job server.
+// Broadcast an outpack to all Gearman server.
-// Here, the job's mean is not the oraginal mean.
-// Just looks like a network package for job's result or tell job server, there was a fail.
 func (worker *Worker) broadcast(outpack *outPack) {
 	for _, v := range worker.agents {
 		v.write(outpack)
@@ -88,8 +78,7 @@ func (worker *Worker) broadcast(outpack *outPack) {
 }
 
 // Add a function.
-// Plz added job servers first, then functions.
+// Set timeout as Unlimited(=0) to disable executing timeout.
-// The API will tell every connected job server that 'I can do this'
 func (worker *Worker) AddFunc(funcname string,
 	f JobFunc, timeout uint32) (err error) {
 	worker.Lock()
@@ -104,7 +93,7 @@ func (worker *Worker) AddFunc(funcname string,
 	return
 }
 
-// inner add function
+// inner add
 func (worker *Worker) addFunc(funcname string, timeout uint32) {
 	outpack := getOutPack()
 	if timeout == 0 {
@@ -135,7 +124,7 @@ func (worker *Worker) RemoveFunc(funcname string) (err error) {
 	return
 }
 
-// inner remove function
+// inner remove
 func (worker *Worker) removeFunc(funcname string) {
 	outpack := getOutPack()
 	outpack.dataType = CANT_DO
@@ -143,6 +132,7 @@ func (worker *Worker) removeFunc(funcname string) {
 	worker.broadcast(outpack)
 }
 
+// inner package handling
 func (worker *Worker) handleInPack(inpack *inPack) {
 	switch inpack.dataType {
 	case NO_JOB:
@@ -168,6 +158,8 @@ func (worker *Worker) handleInPack(inpack *inPack) {
 	}
 }
 
+// Connect to Gearman server and tell every server
+// what can this worker do.
 func (worker *Worker) Ready() (err error) {
 	for _, v := range worker.agents {
 		if err = v.Connect(); err != nil {
@@ -180,11 +172,17 @@ func (worker *Worker) Ready() (err error) {
 	return
 }
 
-// Main loop
+// Main loop, block here
+// Most of time, this should be evaluated in goroutine.
 func (worker *Worker) Work() {
+	defer func() {
+		for _, a := range worker.agents {
+			a.Close()
+		}
+	}()
 	worker.running = true
-	for _, v := range worker.agents {
+	for _, a := range worker.agents {
-		v.Grab()
+		a.Grab()
 	}
 	var inpack *inPack
 	for inpack = range worker.in {
@@ -192,7 +190,7 @@ func (worker *Worker) Work() {
 	}
 }
 
-// job handler
+// custome handling warper
 func (worker *Worker) customeHandler(inpack *inPack) {
 	if worker.JobHandler != nil {
 		if err := worker.JobHandler(inpack); err != nil {
@@ -201,13 +199,13 @@ func (worker *Worker) customeHandler(inpack *inPack) {
 	}
 }
 
-// Close.
+// Close connection and exit main loop
 func (worker *Worker) Close() {
 	worker.running = false
 	close(worker.in)
 }
 
-// Send a something out, get the samething back.
+// Echo
 func (worker *Worker) Echo(data []byte) {
 	outpack := getOutPack()
 	outpack.dataType = ECHO_REQ
@@ -216,7 +214,7 @@ func (worker *Worker) Echo(data []byte) {
 }
 
 // Remove all of functions.
-// Both from the worker or job servers.
+// Both from the worker and job servers.
 func (worker *Worker) Reset() {
 	outpack := getOutPack()
 	outpack.dataType = RESET_ABILITIES
@@ -233,7 +231,7 @@ func (worker *Worker) SetId(id string) {
 	worker.broadcast(outpack)
 }
 
-// Execute the job. And send back the result.
+// inner job executing
 func (worker *Worker) exec(inpack *inPack) (err error) {
 	defer func() {
 		if worker.limit != nil {
@@ -277,11 +275,13 @@ func (worker *Worker) exec(inpack *inPack) (err error) {
 	return
 }
 
+// inner result
 type result struct {
 	data []byte
 	err  error
 }
 
+// executing timer
 func execTimeout(f JobFunc, job Job, timeout time.Duration) (r *result) {
 	rslt := make(chan *result)
 	defer close(rslt)