Analytics/SFAnalyticsActivityTracker.m

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #if __OBJC2__
  25
  26 #import "SFAnalyticsActivityTracker.h"
  27 #import "SFAnalyticsActivityTracker+Internal.h"
  28 #import "SFAnalytics.h"
  29 #import <mach/mach_time.h>
  30 #import "utilities/debugging.h"
  31
  32 @implementation SFAnalyticsActivityTracker {
  33     dispatch_queue_t _queue;
  34     NSString* _name;
  35     Class _clientClass;
  36     NSNumber* _measurement;
  37     uint64_t _start;
  38     BOOL _canceled;
  39 }
  40
  41 - (instancetype)initWithName:(NSString*)name clientClass:(Class)className {
  42     if (![name isKindOfClass:[NSString class]] || ![className isSubclassOfClass:[SFAnalytics class]] ) {
  43         secerror("Cannot instantiate SFActivityTracker without name and client class");
  44         return nil;
  45     }
  46
  47     if (self = [super init]) {
  48         _queue = dispatch_queue_create("SFAnalyticsActivityTracker queue", DISPATCH_QUEUE_SERIAL_WITH_AUTORELEASE_POOL);
  49         _name = name;
  50         _clientClass = className;
  51         _measurement = nil;
  52         _canceled = NO;
  53         _start = 0;
  54     }
  55     return self;
  56 }
  57
  58 - (void)performAction:(void (^)(void))action
  59 {
  60     [self start];
  61     dispatch_sync(_queue, ^{
  62         action();
  63     });
  64     [self stop];
  65 }
  66
  67 - (void)start
  68 {
  69     if (_canceled) {
  70         return;
  71     }
  72     NSAssert(_start == 0, @"SFAnalyticsActivityTracker user called start twice");
  73     _start = mach_absolute_time();
  74 }
  75
  76 - (void)stop
  77 {
  78     uint64_t end = mach_absolute_time();
  79
  80     if (_canceled) {
  81         _start = 0;
  82         return;
  83     }
  84     NSAssert(_start != 0, @"SFAnalyticsActivityTracker user called stop w/o calling start");
  85
  86     static mach_timebase_info_data_t sTimebaseInfo;
  87     if ( sTimebaseInfo.denom == 0 ) {
  88         (void)mach_timebase_info(&sTimebaseInfo);
  89     }
  90
  91     _measurement = @([_measurement doubleValue] + (1.0f * (end - _start) * (1.0f * sTimebaseInfo.numer / sTimebaseInfo.denom)));
  92     _start = 0;
  93 }
  94
  95 - (void)cancel
  96 {
  97     _canceled = YES;
  98 }
  99
 100 - (void)dealloc
 101 {
 102     if (_start != 0) {
 103         [self stop];
 104     }
 105     if (!_canceled && _measurement != nil) {
 106         [[_clientClass logger] logMetric:_measurement withName:_name];
 107     }
 108 }
 109
 110 @end
 111
 112 #endif