[I] new feature: expose core reader tuning options in Java bindings [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new issue, #8252:
URL: https://github.com/apache/opendal/issues/8252

   ### Feature Description
   
   Expose the existing core reader controls through the Java reader/stream construction API so applications can use native bounded concurrency and buffering without implementing their own Range scheduler.
   
   ### Problem and Solution
   
   Java ReadOptions currently contains only offset and length. WriteOptions already exposes write tuning. This is a binding capability gap, not evidence that the core lacks concurrent reading.
   
   The Java options work is already tracked broadly in #6226. This issue isolates reader construction/tuning as an actionable child of that migration and #8251. Preserve the distinction between per-read range options and reader execution options; adding every field to one options class is not a design requirement.
   
   Acceptance criteria:
   - Inventory and map supported core reader controls, including concurrency, chunking and applicable prefetch/gap behavior; document unsupported controls explicitly.
   - Preserve default unchunked streaming and existing range behavior.
   - Verify options reach the core and have documented units and resource implications.
   - Exercise the natural stream API against real storage. Do not use a shared hand-written Range adapter to hide the missing API or suppress SDK capabilities.
   - Keep internal concurrency distinct from the number of application transfers.
   
   ### Additional Context
   
   [Source reference](https://github.com/apache/opendal/blob/b6cf44f7b8a1523409e0e998e478c996ac970f03/bindings/java/src/main/java/org/apache/opendal/ReadOptions.java). OpenDAL API inventory was checked at `b6cf44f7b8a1523409e0e998e478c996ac970f03`.
   


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Re: [I] new feature: expose core reader tuning options in Java bindings [opendal]

["Xuanwo (via GitHub) via commits" <co...@opendal.apache.org>]

Xuanwo closed issue #8252: new feature: expose core reader tuning options in Java bindings
URL: https://github.com/apache/opendal/issues/8252


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