From 1da7dd3da937baeaf0d9d78c3e92d47622791cdb Mon Sep 17 00:00:00 2001
From: Andrew <write@imaginarycode.com>
Date: Thu, 9 Feb 2017 01:39:06 -0500
Subject: [PATCH] Improve status table implementation (#879)

* Remove superfluous defer calls

* Improve status table implementation as well

This would probably only help with large, high-traffic installs
---
 modules/sync/status_pool.go      | 20 +++++++++-----------
 modules/sync/status_pool_test.go | 19 +++++++++++++++++++
 modules/sync/unique_queue.go     |  2 +-
 3 files changed, 29 insertions(+), 12 deletions(-)
 create mode 100644 modules/sync/status_pool_test.go

diff --git a/modules/sync/status_pool.go b/modules/sync/status_pool.go
index f6a7f9495..46d15aa08 100644
--- a/modules/sync/status_pool.go
+++ b/modules/sync/status_pool.go
@@ -14,36 +14,34 @@ import (
 // in different goroutines.
 type StatusTable struct {
 	lock sync.RWMutex
-	pool map[string]bool
+	pool map[string]struct{}
 }
 
 // NewStatusTable initializes and returns a new StatusTable object.
 func NewStatusTable() *StatusTable {
 	return &StatusTable{
-		pool: make(map[string]bool),
+		pool: make(map[string]struct{}),
 	}
 }
 
 // Start sets value of given name to true in the pool.
 func (p *StatusTable) Start(name string) {
 	p.lock.Lock()
-	defer p.lock.Unlock()
-
-	p.pool[name] = true
+	p.pool[name] = struct{}{}
+	p.lock.Unlock()
 }
 
 // Stop sets value of given name to false in the pool.
 func (p *StatusTable) Stop(name string) {
 	p.lock.Lock()
-	defer p.lock.Unlock()
-
-	p.pool[name] = false
+	delete(p.pool, name)
+	p.lock.Unlock()
 }
 
 // IsRunning checks if value of given name is set to true in the pool.
 func (p *StatusTable) IsRunning(name string) bool {
 	p.lock.RLock()
-	defer p.lock.RUnlock()
-
-	return p.pool[name]
+	_, ok := p.pool[name]
+	p.lock.RUnlock()
+	return ok
 }
diff --git a/modules/sync/status_pool_test.go b/modules/sync/status_pool_test.go
new file mode 100644
index 000000000..61e5a2732
--- /dev/null
+++ b/modules/sync/status_pool_test.go
@@ -0,0 +1,19 @@
+package sync
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_StatusTable(t *testing.T) {
+	table := NewStatusTable()
+
+	assert.False(t, table.IsRunning("xyz"))
+
+	table.Start("xyz")
+	assert.True(t, table.IsRunning("xyz"))
+
+	table.Stop("xyz")
+	assert.False(t, table.IsRunning("xyz"))
+}
diff --git a/modules/sync/unique_queue.go b/modules/sync/unique_queue.go
index 3f3c1c866..7dcaa165a 100644
--- a/modules/sync/unique_queue.go
+++ b/modules/sync/unique_queue.go
@@ -51,7 +51,7 @@ func (q *UniqueQueue) AddFunc(id interface{}, fn func()) {
 
 	idStr := com.ToStr(id)
 	q.table.lock.Lock()
-	q.table.pool[idStr] = true
+	q.table.pool[idStr] = struct{}{}
 	if fn != nil {
 		fn()
 	}