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Clean up BTreeWriter

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This commit is contained in:
Viktor Lofgren 2023-03-12 12:49:49 +01:00
parent 347f16939c
commit 281f1322a9
1 changed files with 20 additions and 19 deletions
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39
code/libraries/btree/src/main/java/nu/marginalia/btree/BTreeWriter.java
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@ -17,18 +17,6 @@ public class BTreeWriter {
this.ctx = ctx;
}
private static long indexSize(BTreeContext ctx, int numWords, int numLayers) {
if (numLayers == 0) {
return 0; // Special treatment for small tables
}
long size = 0;
for (int layer = 0; layer < numLayers; layer++) {
size += ctx.indexLayerSize(numWords, layer);
}
return size;
}
/** Construct a BTree with numEntries entries at offset in the associated map
*
* @return The size of the written data
@ -75,19 +63,32 @@ public class BTreeWriter {
}
}
public static BTreeHeader makeHeader(BTreeContext ctx, long offset, int numEntries) {
public static BTreeHeader makeHeader(BTreeContext ctx, long baseOffset, int numEntries) {
final int numLayers = ctx.numIndexLayers(numEntries);
final int padding = getHeaderPadding(ctx, offset, numLayers);
final long indexOffset = offset + BTreeHeader.BTreeHeaderSizeLongs + padding;
final long dataOffset = indexOffset + indexSize(ctx, numEntries, numLayers);
final long indexOffset = baseOffset
+ BTreeHeader.BTreeHeaderSizeLongs
+ headerPaddingSize(ctx, baseOffset, numLayers);
final long dataOffset = indexOffset
+ indexSize(ctx, numEntries, numLayers);
return new BTreeHeader(numLayers, numEntries, indexOffset, dataOffset);
}
private static long indexSize(BTreeContext ctx, int numWords, int numLayers) {
if (numLayers == 0) {
return 0; // Special treatment for small tables
}
private static int getHeaderPadding(BTreeContext ctx, long offset, int numLayers) {
long size = 0;
for (int layer = 0; layer < numLayers; layer++) {
size += ctx.indexLayerSize(numWords, layer);
}
return size;
}
private static int headerPaddingSize(BTreeContext ctx, long baeOffset, int numLayers) {
final int padding;
if (numLayers == 0) {
padding = 0;
@ -97,7 +98,7 @@ public class BTreeWriter {
* a sorted list, there needs to be padding between the header and the index
* in order to get aligned blocks
*/
padding = (int) (ctx.pageSize() - ((offset + BTreeHeader.BTreeHeaderSizeLongs) % ctx.pageSize()));
padding = (int) (ctx.pageSize() - ((baeOffset + BTreeHeader.BTreeHeaderSizeLongs) % ctx.pageSize()));
}
return padding;
}