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2026-11-06 21:43:48 +05:30
parent ecceaa8b32
commit f7b6c1efca
33 changed files with 1258 additions and 0 deletions
@@ -0,0 +1,18 @@
+import com.google.common.hash.Hashing;
+import com.google.common.primitives.UnsignedBytes;
+import com.google.common.util.concurrent.SettableFuture;
+import java.util.Comparator;
+
+/** Three Guava features whose implementations have an Unsafe fast path (see output/11): hashing, byte comparison, futures. Needs guava on the class path. */
+public class GuavaProbe {
+    public static void main(String[] args) throws Exception {
+        byte[] data = "unsafe-migration".getBytes();
+        System.out.println("murmur3_128 = " + Hashing.murmur3_128().hashBytes(data));
+        Comparator<byte[]> cmp = UnsignedBytes.lexicographicalComparator();
+        System.out.println("comparator   = " + cmp.getClass().getName());
+        System.out.println("compare      = " + Integer.signum(cmp.compare(new byte[] {1, 2, 3}, new byte[] {1, 2, 4})));
+        SettableFuture<String> f = SettableFuture.create();
+        f.set("ok");
+        System.out.println("future       = " + f.get());
+    }
+}