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SimpleIdGenerator rolls over at Long.MAX_VALUE

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Closes gh-25485
This commit is contained in:
Rossen Stoyanchev
2020-09-12 03:27:15 +01:00
parent 852718ec0e
commit 49356b2c0f
1 changed files with 4 additions and 9 deletions
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13
spring-core/src/main/java/org/springframework/util/SimpleIdGenerator.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2015 the original author or authors.
* Copyright 2002-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -20,25 +20,20 @@ import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;
/**
* A simple {@link IdGenerator} that starts at 1 and increments by 1 with each call.
* A simple {@link IdGenerator} that starts at 1, increments up to
* {@link Long#MAX_VALUE}, and then rolls over.
*
* @author Rossen Stoyanchev
* @since 4.1.5
*/
public class SimpleIdGenerator implements IdGenerator {
private final AtomicLong mostSigBits = new AtomicLong(0);
private final AtomicLong leastSigBits = new AtomicLong(0);
@Override
public UUID generateId() {
long leastSigBits = this.leastSigBits.incrementAndGet();
if (leastSigBits == 0) {
this.mostSigBits.incrementAndGet();
}
return new UUID(this.mostSigBits.get(), leastSigBits);
return new UUID(0, this.leastSigBits.incrementAndGet());
}
}