From cd9d469eda44479fb22d09b0da8627efaf019969 Mon Sep 17 00:00:00 2001
From: Nathan Kinsinger <nkinsinger@brotherbard.com>
Date: Sun, 28 Mar 2010 17:15:23 -0600
Subject: [PATCH] Use NSOperation's maxConcurrentOperationCount

---
 PBGitHistoryList.h | 1 -
 PBGitHistoryList.m | 9 ++-------
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/PBGitHistoryList.h b/PBGitHistoryList.h
index c3e3a0b..4cf55e0 100644
--- a/PBGitHistoryList.h
+++ b/PBGitHistoryList.h
@@ -31,7 +31,6 @@
 
 	PBGitHistoryGrapher *grapher;
 	NSOperationQueue *graphQueue;
-	NSInvocationOperation *lastOperation;
 
 	NSMutableArray *commits;
 	BOOL isUpdating;
diff --git a/PBGitHistoryList.m b/PBGitHistoryList.m
index 17140f5..584dbe1 100644
--- a/PBGitHistoryList.m
+++ b/PBGitHistoryList.m
@@ -131,8 +131,8 @@
 	if (graphQueue)
 		[graphQueue removeObserver:self forKeyPath:@"operations"];
 	graphQueue = [[NSOperationQueue alloc] init];
+	[graphQueue setMaxConcurrentOperationCount:1];
 	[graphQueue addObserver:self forKeyPath:@"operations" options:0 context:@"operations"];
-	lastOperation = nil;
 
 	grapher = [self grapher];
 }
@@ -140,12 +140,7 @@
 
 - (NSInvocationOperation *) operationForCommits:(NSArray *)newCommits
 {
-	NSInvocationOperation *graphOperation = [[NSInvocationOperation alloc] initWithTarget:grapher selector:@selector(graphCommits:) object:newCommits];
-	if (lastOperation)
-		[graphOperation addDependency:lastOperation];
-	lastOperation = graphOperation;
-
-	return graphOperation;
+	return [[NSInvocationOperation alloc] initWithTarget:grapher selector:@selector(graphCommits:) object:newCommits];
 }