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LUCENE-5722: Speed up MMapDirectory.seek() - first small patch for multi-mmap case 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1599218 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uwe Schindler 2014-06-02 13:35:42 +00:00
parent e83229fd20
commit 0d89f3f6cf
1 changed files with 11 additions and 6 deletions
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17
lucene/core/src/java/org/apache/lucene/store/ByteBufferIndexInput.java
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@ -46,7 +46,7 @@ abstract class ByteBufferIndexInput extends IndexInput {
private long length;
private String sliceDescription;
private int curBufIndex;
private int curBufIndex = -1;
private ByteBuffer curBuf; // redundant for speed: buffers[curBufIndex]
@ -163,11 +163,15 @@ abstract class ByteBufferIndexInput extends IndexInput {
// in case pos + offset overflows.
final int bi = (int) (pos >> chunkSizePower);
try {
final ByteBuffer b = buffers[bi];
b.position((int) (pos & chunkSizeMask));
// write values, on exception all is unchanged
this.curBufIndex = bi;
this.curBuf = b;
if (bi == curBufIndex) {
curBuf.position((int) (pos & chunkSizeMask));
} else {
final ByteBuffer b = buffers[bi];
b.position((int) (pos & chunkSizeMask));
// write values, on exception all is unchanged
this.curBufIndex = bi;
this.curBuf = b;
}
} catch (ArrayIndexOutOfBoundsException aioobe) {
throw new EOFException("seek past EOF: " + this);
} catch (IllegalArgumentException iae) {
@ -228,6 +232,7 @@ abstract class ByteBufferIndexInput extends IndexInput {
clone.buffers = buildSlice(buffers, offset, length);
clone.offset = (int) (offset & chunkSizeMask);
clone.length = length;
clone.curBufIndex = -1;
// register the new clone in our clone list to clean it up on closing:
if (clones != null) {