ImagePipeline.java 文件源码

/**
 * Submits a request for execution and returns a DataSource representing the pending decoded
 * image(s).
 * <p>The returned DataSource must be closed once the client has finished with it.
 *
 * @param imageRequest the request to submit
 * @param callerContext the caller context for image request
 * @param lowestPermittedRequestLevelOnSubmit the lowest request level permitted for image request
 * @return a DataSource representing the pending decoded image(s)
 */
public DataSource<CloseableReference<CloseableImage>> fetchDecodedImage(
    ImageRequest imageRequest,
    Object callerContext,
    ImageRequest.RequestLevel lowestPermittedRequestLevelOnSubmit) {
  try {
    Producer<CloseableReference<CloseableImage>> producerSequence =
        mProducerSequenceFactory.getDecodedImageProducerSequence(imageRequest);
    return submitFetchRequest(
        producerSequence,
        imageRequest,
        lowestPermittedRequestLevelOnSubmit,
        callerContext);
  } catch (Exception exception) {
    return DataSources.immediateFailedDataSource(exception);
  }
}