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125 lines
3.8 KiB
Plaintext
125 lines
3.8 KiB
Plaintext
//
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// ASEventLog.m
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 4/11/16.
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#import <AsyncDisplayKit/ASEventLog.h>
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#import <AsyncDisplayKit/ASThread.h>
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#import <AsyncDisplayKit/ASTraceEvent.h>
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#import <AsyncDisplayKit/ASObjectDescriptionHelpers.h>
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@implementation ASEventLog {
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ASDN::RecursiveMutex __instanceLock__;
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// The index of the most recent log entry. -1 until first entry.
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NSInteger _eventLogHead;
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// A description of the object we're logging for. This is immutable.
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NSString *_objectDescription;
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}
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/**
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* Even just when debugging, all these events can take up considerable memory.
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* Store them in a shared NSCache to limit the total consumption.
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*/
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+ (NSCache<ASEventLog *, NSMutableArray<ASTraceEvent *> *> *)contentsCache
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{
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static NSCache *cache;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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cache = [[NSCache alloc] init];
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});
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return cache;
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}
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- (instancetype)initWithObject:(id)anObject
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{
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if ((self = [super init])) {
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_objectDescription = ASObjectDescriptionMakeTiny(anObject);
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_eventLogHead = -1;
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}
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return self;
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}
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- (instancetype)init
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{
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// This method is marked unavailable so the compiler won't let them call it.
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ASDisplayNodeFailAssert(@"Failed to call initWithObject:");
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return nil;
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}
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- (void)logEventWithBacktrace:(NSArray<NSString *> *)backtrace format:(NSString *)format, ...
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{
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va_list args;
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va_start(args, format);
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ASTraceEvent *event = [[ASTraceEvent alloc] initWithBacktrace:backtrace
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format:format
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arguments:args];
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va_end(args);
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ASDN::MutexLocker l(__instanceLock__);
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NSCache *cache = [ASEventLog contentsCache];
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NSMutableArray<ASTraceEvent *> *events = [cache objectForKey:self];
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if (events == nil) {
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events = [NSMutableArray arrayWithObject:event];
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[cache setObject:events forKey:self];
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_eventLogHead = 0;
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return;
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}
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// Increment the head index.
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_eventLogHead = (_eventLogHead + 1) % ASEVENTLOG_CAPACITY;
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if (_eventLogHead < events.count) {
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[events replaceObjectAtIndex:_eventLogHead withObject:event];
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} else {
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[events insertObject:event atIndex:_eventLogHead];
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}
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}
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- (NSArray<ASTraceEvent *> *)events
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{
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NSMutableArray<ASTraceEvent *> *events = [[ASEventLog contentsCache] objectForKey:self];
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if (events == nil) {
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return nil;
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}
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ASDN::MutexLocker l(__instanceLock__);
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NSUInteger tail = (_eventLogHead + 1);
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NSUInteger count = events.count;
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NSMutableArray<ASTraceEvent *> *result = [NSMutableArray array];
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// Start from `tail` and go through array, wrapping around when we exceed end index.
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for (NSUInteger actualIndex = 0; actualIndex < ASEVENTLOG_CAPACITY; actualIndex++) {
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NSInteger ringIndex = (tail + actualIndex) % ASEVENTLOG_CAPACITY;
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if (ringIndex < count) {
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[result addObject:events[ringIndex]];
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}
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}
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return result;
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}
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- (NSString *)description
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{
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/**
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* This description intentionally doesn't follow the standard description format.
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* Since this is a log, it's important for the description to look a certain way, and
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* the formal description style doesn't allow for newlines and has a ton of punctuation.
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*/
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NSArray *events = [self events];
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if (events == nil) {
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return [NSString stringWithFormat:@"Event log for %@ was purged to conserve memory.", _objectDescription];
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} else {
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return [NSString stringWithFormat:@"Event log for %@. Events: %@", _objectDescription, events];
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}
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}
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@end
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