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Multiple optimizations #62

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cataphract
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@cataphract cataphract commented Mar 8, 2023

  • Introduce two types to aid efficient serialization: MapIterableWithSize and NativeStringAddressable. The first is an entry iterable that doesn't need to be iterated twice, as it has a size(). This alleviates the need to implement Map. The second is a CharSequence that also provides a nul-terminated byte buffer with the UTF-8 representation of the string.
  • Always allocate the initial object in the beginning of the first segment. On a second WAF run, the initial object is replaced. This is allowed by the WAF (the root element, and only the root element, can be replaced between runs), saves a little bit of space and avoids creating a new ByteBuffer slice() on each run.
  • Save memory by not caching PWArgsBuffer objects. To avoid creating many of them, they are reused when possible.
  • Reduce the number of native calls to getByteBufferAddress.
  • Introduce a memory stats function.

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codecov bot commented Mar 8, 2023

Codecov Report

Patch coverage: 85.93% and project coverage change: +0.89 🎉

Comparison is base (2c2c4dc) 56.16% compared to head (9573836) 57.05%.

Additional details and impacted files
@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     56.16%   57.05%   +0.89%     
- Complexity      116      127      +11     
============================================
  Files            31       31              
  Lines          2767     2836      +69     
  Branches        638      651      +13     
============================================
+ Hits           1554     1618      +64     
- Misses          762      763       +1     
- Partials        451      455       +4     
Flag Coverage Δ
helper 57.05% <85.93%> (+0.89%) ⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files Coverage Δ
src/main/java/io/sqreen/powerwaf/Powerwaf.java 85.24% <ø> (ø)
src/main/c/powerwaf_jni.c 52.33% <68.00%> (+0.21%) ⬆️
.../java/io/sqreen/powerwaf/ByteBufferSerializer.java 83.91% <89.89%> (+0.76%) ⬆️
src/main/java/io/sqreen/powerwaf/Additive.java 75.71% <100.00%> (+3.65%) ⬆️
.../main/java/io/sqreen/powerwaf/PowerwafContext.java 94.54% <100.00%> (+0.10%) ⬆️
src/main/c/debug_helpers.c 60.00% <0.00%> (+2.22%) ⬆️

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