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| <h2 title="Class UuidUtil" class="title">Class UuidUtil</h2> |
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| <li>org.apache.logging.log4j.core.util.UuidUtil</li> |
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| <pre>public final class <a href="../../../../../../src-html/org/apache/logging/log4j/core/util/UuidUtil.html#line.38">UuidUtil</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Generates a unique ID. The generated UUID will be unique for approximately 8,925 years so long as |
| less than 10,000 IDs are generated per millisecond on the same device (as identified by its MAC address).</div> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/logging/log4j/core/util/UuidUtil.html#UUID_SEQUENCE">UUID_SEQUENCE</a></span></code> |
| <div class="block">System property that may be used to seed the UUID generation with an integer value.</div> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/logging/log4j/core/util/UuidUtil.html#getTimeBasedUuid--">getTimeBasedUuid</a></span>()</code> |
| <div class="block">Generates Type 1 UUID.</div> |
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| <h4>UUID_SEQUENCE</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> <a href="../../../../../../src-html/org/apache/logging/log4j/core/util/UuidUtil.html#line.42">UUID_SEQUENCE</a></pre> |
| <div class="block">System property that may be used to seed the UUID generation with an integer value.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.logging.log4j.core.util.UuidUtil.UUID_SEQUENCE">Constant Field Values</a></dd> |
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| <h4>getTimeBasedUuid</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a> <a href="../../../../../../src-html/org/apache/logging/log4j/core/util/UuidUtil.html#line.145">getTimeBasedUuid</a>()</pre> |
| <div class="block">Generates Type 1 UUID. The time contains the number of 100NS intervals that have occurred |
| since 00:00:00.00 UTC, 10 October 1582. Each UUID on a particular machine is unique to the 100NS interval |
| until they rollover around 3400 A.D. |
| <ol> |
| <li>Digits 1-12 are the lower 48 bits of the number of 100 ns increments since the start of the UUID |
| epoch.</li> |
| <li>Digit 13 is the version (with a value of 1).</li> |
| <li>Digits 14-16 are a sequence number that is incremented each time a UUID is generated.</li> |
| <li>Digit 17 is the variant (with a value of binary 10) and 10 bits of the sequence number</li> |
| <li>Digit 18 is final 16 bits of the sequence number.</li> |
| <li>Digits 19-32 represent the system the application is running on.</li> |
| </ol></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>universally unique identifiers (UUID)</dd> |
| </dl> |
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