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Deterministic UUID option for PatternLayout #3532

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Deterministic UUID option for PatternLayout #3532

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5869395
Add UUID 'EVENT' option based on LogEvent hash
kazariad Mar 12, 2025
efbc3e9
Update hash strategy
kazariad Mar 17, 2025
7f126de
Add test
kazariad Mar 17, 2025
8a01c7b
Add benchmark
kazariad Mar 17, 2025
afcecf2
Update docs
kazariad Mar 17, 2025
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Add test
@kazariad
kazariad committed Mar 17, 2025
commit 7f126de6bd0b07fca373322a804f975c25d8475a
16 changes: 16 additions & 0 deletions log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/UuidTest.java
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Original file line number Diff line number Diff line change
@@ -20,6 +20,8 @@
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.UUID;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.test.layout.LogEventFixtures;
import org.junit.jupiter.api.Test;

public class UuidTest {
@@ -107,6 +109,20 @@ public void testThreads() throws Exception {
assertEquals(0, errors, errors + " duplicate UUIDS");
}

@Test
public void testHashBasedUuid() {
LogEvent event1 = LogEventFixtures.createLogEvent();
LogEvent event2 = LogEventFixtures.createLogEvent()
.asBuilder()
.setThrown(event1.getThrown())
.build();
UUID uuid1 = UuidUtil.getHashBasedUuid(event1);
UUID uuid2 = UuidUtil.getHashBasedUuid(event2);
assertEquals(uuid1, uuid2, "UUIDs don't match");
assertEquals(8, uuid1.version(), "Wrong version");
assertEquals(2, uuid1.variant(), "Wrong variant");
}

private static class Worker extends Thread {

private final UUID[] uuids;