Add assertion on initialization sequence.

The order at which to call the controller methods is:
1) Any method that change the configuration_ field
2) start
3) Any other method

 This change adds assertion that it is done correctly.
Review URL: https://breakpad.appspot.com/499003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1085 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/ios/BreakpadController.h

@@ -55,6 +55,10 @@
   // Whether or not crash reports should be uploaded.
   BOOL enableUploads_;
 
+  // Whether the controller has been started on the main thread. This is only
+  // used to assert the initialization order is correct.
+  BOOL started_;
+
   // The interval to wait between two uploads. Value is 0 if no upload must be
   // done.
   int uploadIntervalInSeconds_;

src/client/ios/BreakpadController.mm

@@ -110,6 +110,7 @@ NSString* GetPlatform() {
     queue_ = dispatch_queue_create("com.google.BreakpadQueue", NULL);
     configuration_ = [[[NSBundle mainBundle] infoDictionary] mutableCopy];
     enableUploads_ = NO;
+    started_ = NO;
     NSString* uploadInterval =
         [configuration_ valueForKey:@BREAKPAD_REPORT_INTERVAL];
     [self setUploadInterval:[uploadInterval intValue]];
@@ -135,6 +136,8 @@ NSString* GetPlatform() {
         BreakpadAddUploadParameter(breakpadRef_, @"platform", GetPlatform());
       }
   };
+  NSAssert(!started_, @"Start cannot be called more than once.");
+  started_ = YES;
   if (onCurrentThread)
     startBlock();
   else
@@ -142,6 +145,9 @@ NSString* GetPlatform() {
 }
 
 - (void)stop {
+  NSAssert(started_,
+      @"The controller must be started before it can be stopped");
+  started_ = NO;
   dispatch_sync(queue_, ^{
       if (breakpadRef_) {
         BreakpadRelease(breakpadRef_);
@@ -151,6 +157,8 @@ NSString* GetPlatform() {
 }
 
 - (void)setUploadingEnabled:(BOOL)enabled {
+  NSAssert(started_,
+      @"The controller must be started before setUploadingEnabled is called");
   dispatch_async(queue_, ^{
       if (enabled == enableUploads_)
         return;
@@ -169,6 +177,8 @@ NSString* GetPlatform() {
 }
 
 - (void)updateConfiguration:(NSDictionary*)configuration {
+  NSAssert(!started_,
+      @"The controller must not be started when updateConfiguration is called");
   [configuration_ addEntriesFromDictionary:configuration];
   NSString* uploadInterval =
       [configuration_ valueForKey:@BREAKPAD_REPORT_INTERVAL];
@@ -177,10 +187,14 @@ NSString* GetPlatform() {
 }
 
 - (void)setUploadingURL:(NSString*)url {
+  NSAssert(!started_,
+      @"The controller must not be started when setUploadingURL is called");
   [configuration_ setValue:url forKey:@BREAKPAD_URL];
 }
 
 - (void)setUploadInterval:(int)intervalInSeconds {
+  NSAssert(!started_,
+      @"The controller must not be started when setUploadInterval is called");
   [configuration_ removeObjectForKey:@BREAKPAD_REPORT_INTERVAL];
   uploadIntervalInSeconds_ = intervalInSeconds;
   if (uploadIntervalInSeconds_ < 0)
@@ -188,6 +202,8 @@ NSString* GetPlatform() {
 }
 
 - (void)addUploadParameter:(NSString*)value forKey:(NSString*)key {
+  NSAssert(started_,
+      @"The controller must be started before addUploadParameter is called");
   dispatch_async(queue_, ^{
       if (breakpadRef_)
         BreakpadAddUploadParameter(breakpadRef_, key, value);
@@ -195,6 +211,8 @@ NSString* GetPlatform() {
 }
 
 - (void)removeUploadParameterForKey:(NSString*)key {
+  NSAssert(started_, @"The controller must be started before "
+                     "removeUploadParameterForKey is called");
   dispatch_async(queue_, ^{
       if (breakpadRef_)
         BreakpadRemoveUploadParameter(breakpadRef_, key);
@@ -202,6 +220,8 @@ NSString* GetPlatform() {
 }
 
 - (void)withBreakpadRef:(void(^)(BreakpadRef))callback {
+  NSAssert(started_,
+      @"The controller must be started before withBreakpadRef is called");
   dispatch_async(queue_, ^{
       callback(breakpadRef_);
   });