5611d08df1
Significantly reduce the memory footprint of adding tracks to the playlist, by coalescing the NSString and NSData objects in the info dictionaries as they are being loaded in the background, into a common data set which will then be discarded when the whole job is completed. Signed-off-by: Christopher Snowhill <kode54@gmail.com>
68 lines
1.7 KiB
Objective-C
68 lines
1.7 KiB
Objective-C
//
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// RedundantPlaylistDataStore.m
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// Cog
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//
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// Created by Christopher Snowhill on 2/16/22.
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//
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// Coalesce an entryInfo dictionary from tag loading into a common data dictionary, to
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// reduce the memory footprint of adding a lot of tracks to the playlist.
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#import "RedundantPlaylistDataStore.h"
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@implementation RedundantPlaylistDataStore
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- (id)init {
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self = [super init];
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if(self) {
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stringStore = [[NSMutableArray alloc] init];
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artStore = [[NSMutableArray alloc] init];
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}
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return self;
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}
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- (NSString *)coalesceString:(NSString *)in {
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if(in == nil) return in;
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NSUInteger index = [stringStore indexOfObject:in];
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if(index == NSNotFound) {
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[stringStore addObject:in];
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return in;
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} else {
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return [stringStore objectAtIndex:index];
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}
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}
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- (NSData *)coalesceArt:(NSData *)in {
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if(in == nil) return in;
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NSUInteger index = [artStore indexOfObject:in];
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if(index == NSNotFound) {
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[artStore addObject:in];
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return in;
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} else {
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return [artStore objectAtIndex:index];
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}
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}
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- (NSDictionary *)coalesceEntryInfo:(NSDictionary *)entryInfo {
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__block NSMutableDictionary *ret = [[NSMutableDictionary alloc] initWithCapacity:[entryInfo count]];
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[entryInfo enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL *_Nonnull stop) {
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if([[obj class] isSubclassOfClass:[NSString class]]) {
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NSString *stringObj = (NSString *)obj;
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[ret setObject:[self coalesceString:stringObj] forKey:key];
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} else if([[obj class] isSubclassOfClass:[NSData class]]) {
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NSData *dataObj = (NSData *)obj;
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[ret setObject:[self coalesceArt:dataObj] forKey:key];
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} else {
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[ret setObject:obj forKey:key];
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}
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}];
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return [NSDictionary dictionaryWithDictionary:ret];
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}
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@end
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