ios/chrome/browser/metrics/previous_session_info.mm

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "ios/chrome/browser/metrics/previous_session_info.h"
   6
   7 #include "base/logging.h"
   8 #include "base/mac/scoped_nsobject.h"
   9 #include "base/strings/sys_string_conversions.h"
  10 #include "components/version_info/version_info.h"
  11
  12 namespace {
  13
  14 // Key in the UserDefaults for a boolean value keeping track of memory warnings.
  15 NSString* const kDidSeeMemoryWarningShortlyBeforeTerminating =
  16     @"DidSeeMemoryWarning";
  17
  18 // Key in the NSUserDefaults for a string value that stores the version of the
  19 // last session.
  20 NSString* const kLastRanVersion = @"LastRanVersion";
  21
  22 }  // namespace
  23
  24 @interface PreviousSessionInfo ()
  25
  26 // Whether beginRecordingCurrentSession was called.
  27 @property(nonatomic, assign) BOOL didBeginRecordingCurrentSession;
  28
  29 // Redefined to be read-write.
  30 @property(nonatomic, assign) BOOL didSeeMemoryWarningShortlyBeforeTerminating;
  31 @property(nonatomic, assign) BOOL isFirstSessionAfterUpgrade;
  32
  33 @end
  34
  35 @implementation PreviousSessionInfo
  36
  37 @synthesize didBeginRecordingCurrentSession = _didBeginRecordingCurrentSession;
  38 @synthesize didSeeMemoryWarningShortlyBeforeTerminating =
  39     _didSeeMemoryWarningShortlyBeforeTerminating;
  40 @synthesize isFirstSessionAfterUpgrade = _isFirstSessionAfterUpgrade;
  41
  42 // Singleton PreviousSessionInfo.
  43 static PreviousSessionInfo* gSharedInstance = nil;
  44
  45 + (instancetype)sharedInstance {
  46   if (!gSharedInstance) {
  47     gSharedInstance = [[PreviousSessionInfo alloc] init];
  48
  49     // Load the persisted information.
  50     NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
  51     gSharedInstance.didSeeMemoryWarningShortlyBeforeTerminating =
  52         [defaults boolForKey:kDidSeeMemoryWarningShortlyBeforeTerminating];
  53     NSString* lastRanVersion = [defaults stringForKey:kLastRanVersion];
  54     NSString* currentVersion =
  55         base::SysUTF8ToNSString(version_info::GetVersionNumber());
  56     gSharedInstance.isFirstSessionAfterUpgrade =
  57         ![lastRanVersion isEqualToString:currentVersion];
  58   }
  59   return gSharedInstance;
  60 }
  61
  62 + (void)resetSharedInstanceForTesting {
  63   [gSharedInstance release];
  64   gSharedInstance = nil;
  65 }
  66
  67 - (void)beginRecordingCurrentSession {
  68   if (self.didBeginRecordingCurrentSession)
  69     return;
  70   self.didBeginRecordingCurrentSession = YES;
  71
  72   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
  73
  74   // Set the new version.
  75   NSString* currentVersion =
  76       base::SysUTF8ToNSString(version_info::GetVersionNumber());
  77   [defaults setObject:currentVersion forKey:kLastRanVersion];
  78
  79   // Clear the memory warning flag.
  80   [defaults removeObjectForKey:kDidSeeMemoryWarningShortlyBeforeTerminating];
  81
  82   // Save critical state information for crash detection.
  83   [defaults synchronize];
  84 }
  85
  86 - (void)setMemoryWarningFlag {
  87   if (!self.didBeginRecordingCurrentSession)
  88     return;
  89
  90   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
  91   [defaults setBool:YES forKey:kDidSeeMemoryWarningShortlyBeforeTerminating];
  92   // Save critical state information for crash detection.
  93   [defaults synchronize];
  94 }
  95
  96 - (void)resetMemoryWarningFlag {
  97   if (!self.didBeginRecordingCurrentSession)
  98     return;
  99
 100   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
 101   [defaults removeObjectForKey:kDidSeeMemoryWarningShortlyBeforeTerminating];
 102   // Save critical state information for crash detection.
 103   [defaults synchronize];
 104 }
 105
 106 @end