public ImageRequestBuilder setDiskCacheId(@Nullable String diskCacheId) {
    this.mDiskCacheId = diskCacheId;
    return this;
  }
Sets a disk cache id to determine which diskCache to use for this request.

@param diskCacheId a disk cache id to determine which diskCache to use for this request.
@return the modified builder instance
imagepipeline/src/main/java/com/facebook/imagepipeline/request/ImageRequestBuilder.java