danmuzi commented on a change in pull request #1338: LUCENE-9271: Move
BufferedIndexInput to the ByteBuffer API
URL: https://github.com/apache/lucene-solr/pull/1338#discussion_r391152040
##########
File path: lucene/core/src/java/org/apache/lucene/store/BufferedIndexInput.java
##########
@@ -154,65 +146,60 @@ public final void readBytes(byte[] b, int offset, int
len, boolean useBuffer) th
// this function, there is no need to do a seek
// here, because there's no need to reread what we
// had in the buffer.
- long after = bufferStart+bufferPosition+len;
+ long after = bufferStart+buffer.position()+len;
if(after > length())
throw new EOFException("read past EOF: " + this);
- readInternal(b, offset, len);
+ readInternal(ByteBuffer.wrap(b, offset, len));
bufferStart = after;
- bufferPosition = 0;
- bufferLength = 0; // trigger refill() on read
+ buffer.position(0);
Review comment:
I think if there is `buffer.limit(0)` on the next line, `buffer.position(0)`
doesn't look necessary.
Because there is a code of initializing position value within
`buffer.limit(0)`.
```java
// ByteBuffer.java
public abstract class ByteBuffer extends Buffer implements
Comparable<ByteBuffer>
{
...
ByteBuffer limit(int newLimit) {
super.limit(newLimit);
return this;
}
...
}
// Buffer.java
public abstract class Buffer {
...
public Buffer limit(int newLimit) {
if (newLimit > capacity | newLimit < 0)
throw createLimitException(newLimit);
limit = newLimit;
if (position > limit) position = limit; // position will be 0.
if (mark > limit) mark = -1;
return this;
}
...
}
```
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