Test fetch blocking

[reliable-chat] / server / server.go

diff --git a/server/server.go b/server/server.go
index bfe10669e7f0bd34368984dffbde1c7fe8adcd55..a328785aa5375ebfd8693b7cc6e44038a8ccfa45 100644 (file)
--- a/server/server.go
+++ b/server/server.go
@@ -2,10 +2,20 @@ package main
 
 import "container/list"
 import "encoding/json"
+import "expvar"
+import "flag"
 import "log"
 import "net/http"
+import "strconv"
 import "time"
 
+var port = flag.Int("port", 21059, "Port to listen on")
+
+var speak_count = expvar.NewInt("speak_count")
+var fetch_count = expvar.NewInt("fetch_count")
+var fetch_wait_count = expvar.NewInt("fetch_wait_count")
+var fetch_wake_count = expvar.NewInt("fetch_wake_count")
+
 type Message struct {
        Time time.Time
        Text string
@@ -28,23 +38,34 @@ func manage_store(store Store) {
        message_count := 0
        max_messages := 1000
        waiting := list.New()
+main:
        for {
                select {
-               case new_message := <-store.Add:
-                       messages.PushBack(new_message)
+               case new_message, ok := <-store.Add:
+                       if !ok {
+                               break main
+                       }
+                       speak_count.Add(1)
                        for waiter := waiting.Front(); waiter != nil; waiter = waiter.Next() {
                                waiter.Value.(*StoreRequest).Messages <- []Message{*new_message}
                                close(waiter.Value.(*StoreRequest).Messages)
+                               fetch_wake_count.Add(1)
                        }
                        waiting.Init()
+                       messages.PushBack(new_message)
                        if message_count < max_messages {
                                message_count++
                        } else {
                                messages.Remove(messages.Front())
                        }
-               case request := <-store.Get:
+               case request, ok := <-store.Get:
+                       if !ok {
+                               break main
+                       }
+                       fetch_count.Add(1)
                        if messages.Back() == nil || !request.StartTime.Before(messages.Back().Value.(*Message).Time) {
                                waiting.PushBack(request)
+                               fetch_wait_count.Add(1)
                        } else {
                                start := messages.Back()
                                response_size := 1
@@ -103,7 +124,7 @@ func start_server(store Store) {
                store.Add <- &Message{time.Now(), r.FormValue("text")}
        })
 
-       log.Fatal(http.ListenAndServe(":8080", nil))
+       log.Fatal(http.ListenAndServe(":" + strconv.Itoa(*port), nil))
 }
 
 func main() {