Use Java's hardware-accelerated CRC32C implementation where available. #6551
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This is the first use of a Java 9 API in Guava, but we use the API only when it's available, so we maintain compatibility with Java 8. Use of Java 9 APIs is relevant to #6549 and #3990 (and also mojohaus/animal-sniffer#67). I didn't make the same change for `guava-android`, which [will add `java.util.zip.CRC32C` in API Level 34](https://developer.android.com/reference/java/util/zip/CRC32C). I don't know if Android is providing similar performance improvements, so it might not even matter. But even if I wanted to do it, I can't with my current approach, which relies on `MethodHandle`—unless I want to make even the usage of `MethodHandle` conditional on a reflective check :) RELNOTES=`hash`: Enhanced `crc32c()` to use Java's hardware-accelerated implementation where available. PiperOrigin-RevId: 539722059
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Use Java's hardware-accelerated CRC32C implementation where available.
This is the first use of a Java 9 API in Guava, but we use the API only when it's available, so we maintain compatibility with Java 8. Use of Java 9 APIs is relevant to #6549 and #3990 (and also mojohaus/animal-sniffer#67).
I didn't make the same change for
guava-android, which will addjava.util.zip.CRC32Cin API Level 34. I don't know if Android is providing similar performance improvements, so it might not even matter. But even if I wanted to do it, I can't with my current approach, which relies onMethodHandle—unless I want to make even the usage ofMethodHandleconditional on a reflective check :)RELNOTES=
hash: Enhancedcrc32c()to use Java's hardware-accelerated implementation where available.