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Docs for array and btree

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Viktor Lofgren 2023-03-04 18:06:53 +01:00
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16
libraries/array/readme.md
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@ -10,7 +10,7 @@ crosses a page boundary, it is not delegated and a bit slower.
It's a very C++-style library that does unidiomatic things with interface default It's a very C++-style library that does unidiomatic things with interface default
functions to get diamond inheritance. functions to get diamond inheritance.
# Quick demo: ## Quick demo:
```java ```java
var array = LongArray.mmapForWriting(Path.of("/tmp/test"), 1<<16); var array = LongArray.mmapForWriting(Path.of("/tmp/test"), 1<<16);
@ -25,4 +25,16 @@ array.forEach(0, 100, (pos, val) -> {
System.out.println(pos + ":" + val); System.out.println(pos + ":" + val);
}); });
``` ```
## Query Buffers
The library offers many operations for sorting and dealing with sorted data.
Especially noteworthy are the operations `retain()` and `reject()` in
([IntArraySearch](src/main/java/nu/marginalia/array/algo/IntArraySearch.java) and [LongArraySearch](src/main/java/nu/marginalia/array/algo/LongArraySearch.java)) which act upon the
classes [IntQueryBuffer](src/main/java/nu/marginalia/array/buffer/IntQueryBuffer.java)
and [LongQueryBuffer](src/main/java/nu/marginalia/array/buffer/LongQueryBuffer.java);
they keep or remove all items in the buffer that exist in the range. These are used
to offer an intersection operation for the B-Tree that has in practice sub-linear run time.