amaliujia commented on code in PR #1488:
URL: https://github.com/apache/ratis/pull/1488#discussion_r3526119963
##########
ratis-examples/src/main/java/org/apache/ratis/examples/filestore/FileInfo.java:
##########
@@ -88,6 +89,34 @@ ByteString read(CheckedFunction<Path, Path, IOException>
resolver, long offset,
}
}
+ void streamRead(CheckedFunction<Path, Path, IOException> resolver, long
offset, long length,
+ WritableByteChannel stream) throws IOException {
+ if (offset + length > getWriteSize()) {
+ throw new IOException("Failed to read Wrote: offset (=" + offset
+ + " + length (=" + length + ") > size = " + getWriteSize()
+ + ", path=" + getRelativePath());
+ }
+
+ try (SeekableByteChannel in = Files.newByteChannel(
+ resolver.apply(getRelativePath()), StandardOpenOption.READ)) {
+ in.position(offset);
+ long remaining = length;
+ while (remaining > 0) {
+ final int chunkSize = FileStoreCommon.getChunkSize(remaining);
+ final ByteBuffer buffer = ByteBuffer.allocateDirect(chunkSize);
+ final int n = in.read(buffer);
+ if (n <= 0) {
+ break;
+ }
+ buffer.flip();
+ stream.write(buffer);
+ remaining -= n;
+ }
+ } finally {
+ stream.close();
+ }
Review Comment:
Done
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