1 files changed, 0 insertions, 116 deletions
diff --git a/doc/codewalk/urlpoll.go b/doc/codewalk/urlpoll.go
deleted file mode 100644
index 1fb99581f0..0000000000
--- a/doc/codewalk/urlpoll.go
+++ /dev/null
@@ -1,116 +0,0 @@
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"log"
-	"net/http"
-	"time"
-)
-
-const (
-	numPollers     = 2                // number of Poller goroutines to launch
-	pollInterval   = 60 * time.Second // how often to poll each URL
-	statusInterval = 10 * time.Second // how often to log status to stdout
-	errTimeout     = 10 * time.Second // back-off timeout on error
-)
-
-var urls = []string{
-	"http://www.google.com/",
-	"http://golang.org/",
-	"http://blog.golang.org/",
-}
-
-// State represents the last-known state of a URL.
-type State struct {
-	url    string
-	status string
-}
-
-// StateMonitor maintains a map that stores the state of the URLs being
-// polled, and prints the current state every updateInterval nanoseconds.
-// It returns a chan State to which resource state should be sent.
-func StateMonitor(updateInterval time.Duration) chan<- State {
-	updates := make(chan State)
-	urlStatus := make(map[string]string)
-	ticker := time.NewTicker(updateInterval)
-	go func() {
-		for {
-			select {
-			case <-ticker.C:
-				logState(urlStatus)
-			case s := <-updates:
-				urlStatus[s.url] = s.status
-			}
-		}
-	}()
-	return updates
-}
-
-// logState prints a state map.
-func logState(s map[string]string) {
-	log.Println("Current state:")
-	for k, v := range s {
-		log.Printf(" %s %s", k, v)
-	}
-}
-
-// Resource represents an HTTP URL to be polled by this program.
-type Resource struct {
-	url      string
-	errCount int
-}
-
-// Poll executes an HTTP HEAD request for url
-// and returns the HTTP status string or an error string.
-func (r *Resource) Poll() string {
-	resp, err := http.Head(r.url)
-	if err != nil {
-		log.Println("Error", r.url, err)
-		r.errCount++
-		return err.Error()
-	}
-	r.errCount = 0
-	return resp.Status
-}
-
-// Sleep sleeps for an appropriate interval (dependent on error state)
-// before sending the Resource to done.
-func (r *Resource) Sleep(done chan<- *Resource) {
-	time.Sleep(pollInterval + errTimeout*time.Duration(r.errCount))
-	done <- r
-}
-
-func Poller(in <-chan *Resource, out chan<- *Resource, status chan<- State) {
-	for r := range in {
-		s := r.Poll()
-		status <- State{r.url, s}
-		out <- r
-	}
-}
-
-func main() {
-	// Create our input and output channels.
-	pending, complete := make(chan *Resource), make(chan *Resource)
-
-	// Launch the StateMonitor.
-	status := StateMonitor(statusInterval)
-
-	// Launch some Poller goroutines.
-	for i := 0; i < numPollers; i++ {
-		go Poller(pending, complete, status)
-	}
-
-	// Send some Resources to the pending queue.
-	go func() {
-		for _, url := range urls {
-			pending <- &Resource{url: url}
-		}
-	}()
-
-	for r := range complete {
-		go r.Sleep(pending)
-	}
-}