浅谈 Fresco 框架结构 (2)

public interface ProducerContext { @StringDef({ ExtraKeys.ORIGIN, ExtraKeys.ORIGIN_SUBCATEGORY, ExtraKeys.NORMALIZED_URI, ExtraKeys.SOURCE_URI, ExtraKeys.ENCODED_WIDTH, ExtraKeys.ENCODED_HEIGHT, ExtraKeys.ENCODED_SIZE, ExtraKeys.MULTIPLEX_BITMAP_COUNT, ExtraKeys.MULTIPLEX_ENCODED_COUNT, }) @interface ExtraKeys { String ORIGIN = "origin"; String ORIGIN_SUBCATEGORY = "origin_sub"; String SOURCE_URI = "uri_source"; String NORMALIZED_URI = "uri_norm"; String ENCODED_WIDTH = "encoded_width"; String ENCODED_HEIGHT = "encoded_height"; String ENCODED_SIZE = "encoded_size"; /* number of deduped request in BitmapMemoryCacheKeyMultiplexProducer */ String MULTIPLEX_BITMAP_COUNT = "multiplex_bmp_cnt"; /* number of deduped request in EncodedCacheKeyMultiplexProducer */ String MULTIPLEX_ENCODED_COUNT = "multiplex_enc_cnt"; } /** @return image request that is being executed */ ImageRequest getImageRequest(); /** @return id of this request */ String getId(); /** @return optional id of the UI component requesting the image */ @Nullable String getUiComponentId(); /** @return ProducerListener2 for producer's events */ ProducerListener2 getProducerListener(); /** @return the {@link Object} that indicates the caller's context */ Object getCallerContext(); /** @return the lowest permitted {@link ImageRequest.RequestLevel} */ ImageRequest.RequestLevel getLowestPermittedRequestLevel(); /** @return true if the request is a prefetch, false otherwise. */ boolean isPrefetch(); /** @return priority of the request. */ Priority getPriority(); /** @return true if request's owner expects intermediate results */ boolean isIntermediateResultExpected(); /** * Adds callbacks to the set of callbacks that are executed at various points during the * processing of a request. * * @param callbacks callbacks to be executed */ void addCallbacks(ProducerContextCallbacks callbacks); ImagePipelineConfig getImagePipelineConfig(); EncodedImageOrigin getEncodedImageOrigin(); void setEncodedImageOrigin(EncodedImageOrigin encodedImageOrigin); <E> void setExtra(@ExtraKeys String key, @Nullable E value); void putExtras(@Nullable Map<String, ?> extras); @Nullable <E> E getExtra(String key); @Nullable <E> E getExtra(String key, @Nullable E valueIfNotFound); Map<String, Object> getExtras(); /** Helper to set {@link ExtraKeys#ORIGIN} and {@link ExtraKeys#ORIGIN_SUBCATEGORY} */ void putOriginExtra(@Nullable String origin, @Nullable String subcategory); /** Helper to set {@link ExtraKeys#ORIGIN} */ void putOriginExtra(@Nullable String origin); }

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