Optimize StringBuilder based loops #50
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Motivation: Nodes' internalToString and ParseExceptions uses StringBuilder based loops. Even tough those shouldn't be on the hot path if Expressions are cached, they still can be optimized. Modifications: * Stop using Iterators with nested hasNext tests. Use simple for loops that have a chance of being JIT'ed with escape analysis. * Don't test last element in loop (cf above). Update StringBuilder's length after loop if it wasn't empty. * Don't use StringBuilder#delete that causes a copy of the underlying char array. Update StringBuilder's length instead as we always want to remove the tail. Result: Less allocations
iconara
approved these changes
Jun 7, 2019
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Shoot, I deleted wrong branch. Will submit again. |
Ah, I had no idea. That restriction makes no sense. |
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I've added you as a "triage" collaborator. |
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Awesome, thanks! |
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There's also a new snapshot release with all your PRs: https://github.com/burtcorp/jmespath-java/releases/tag/jmespath-0.3.1-SNAPSHOT |
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Motivation:
Nodes' internalToString and ParseExceptions uses StringBuilder based loops. Even tough those shouldn't be on the hot path if Expressions are cached, they still can be optimized.
Modifications:
Result:
Less allocations