imagepipeline/src/main/java/com/facebook/imagepipeline/producers/DiskCacheReadProducer.java [145:171]:
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      final ProducerListener2 listener,
      final ProducerContext producerContext,
      final boolean valueFound,
      final int sizeInBytes) {
    if (!listener.requiresExtraMap(producerContext, PRODUCER_NAME)) {
      return null;
    }
    if (valueFound) {
      return ImmutableMap.of(
          EXTRA_CACHED_VALUE_FOUND,
          String.valueOf(valueFound),
          ENCODED_IMAGE_SIZE,
          String.valueOf(sizeInBytes));
    } else {
      return ImmutableMap.of(EXTRA_CACHED_VALUE_FOUND, String.valueOf(valueFound));
    }
  }

  private void subscribeTaskForRequestCancellation(
      final AtomicBoolean isCancelled, ProducerContext producerContext) {
    producerContext.addCallbacks(
        new BaseProducerContextCallbacks() {
          @Override
          public void onCancellationRequested() {
            isCancelled.set(true);
          }
        });
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imagepipeline/src/main/java/com/facebook/imagepipeline/producers/PartialDiskCacheProducer.java [206:232]:
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      final ProducerListener2 listener,
      final ProducerContext producerContext,
      final boolean valueFound,
      final int sizeInBytes) {
    if (!listener.requiresExtraMap(producerContext, PRODUCER_NAME)) {
      return null;
    }
    if (valueFound) {
      return ImmutableMap.of(
          EXTRA_CACHED_VALUE_FOUND,
          String.valueOf(valueFound),
          ENCODED_IMAGE_SIZE,
          String.valueOf(sizeInBytes));
    } else {
      return ImmutableMap.of(EXTRA_CACHED_VALUE_FOUND, String.valueOf(valueFound));
    }
  }

  private void subscribeTaskForRequestCancellation(
      final AtomicBoolean isCancelled, ProducerContext producerContext) {
    producerContext.addCallbacks(
        new BaseProducerContextCallbacks() {
          @Override
          public void onCancellationRequested() {
            isCancelled.set(true);
          }
        });
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