Fix memory cache miss when Transformation reduces input bitmap's size.#357
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colinrtwhite
commented
Apr 9, 2020
| fun trimMemory(level: Int) | ||
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| /** Cache key for [MemoryCache] and [WeakMemoryCache]. */ | ||
| class Key { |
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No data class, unfortunately, since we need to be able to control when size is null using the constructors.
Jawnnypoo
reviewed
Apr 9, 2020
| class Builder { | ||
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| private val map: SortedMap<String, Entry> | ||
| private val map: MutableMap<String, Entry> |
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@Jawnnypoo The iteration order had to be consistent irrespective of insertion order so the cache key would match up. If we didn't sort by keys, the parameters would produce two difference cache keys. E.g.
val parameters = Parameters.Builder()
.set("key1", "first_value")
.set("key2", "second_value")
.build()
// would produce the string cache key "key1=first_value#key2=second_value"
val parameters = Parameters.Builder()
.set("key2", "second_value")
.set("key1", "first_value")
.build()
// would produce the string cache key "key2=second_value#key1=first_value"One of the gotchas of using a string cache key. Now order doesn't matter since Parameters are compared using Map.equals!
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Ahhhh gotcha. Thanks for clarifying!
Jawnnypoo
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Apr 9, 2020
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Awesome! Glad to see this is fixed!
colinrtwhite
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Oct 5, 2022
#357) * Fix memory cache miss when Transformation reduces input bitmap's size. * Update API. * Re-add toString(). * Add regression test. * Update API. * cache -> cached. * Remove signature. * Re-arrange params. * isCachedDrawableValid -> isCachedValueValid. * Update equals. * Fix style.
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This fixes a bug where a request could miss the memory cache if it uses a transformation that decreases the output bitmap's height (e.g.
CircleCropTransformation). It's reproducible on master if you add aCircleCropTransformationinImageListAdapter.This requires a broader refactor to convert the memory cache's key from
Stringto a custom object so we can hold onto the request's resolved size. Overall, I've been planning to move away from using a String cache key for a while as it has gotchas (likeParametershaving to always order its entries the same way irrespective of insertion order).Added regression tests to guard against this going forward.