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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.logging.log4j.core.util</a></div> |
| <h1 title="Class UuidUtil" class="title">Class UuidUtil</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.logging.log4j.core.util.UuidUtil</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">UuidUtil</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <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> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| <div class="col-first even-row-color"><code>static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#UUID_SEQUENCE" class="member-name-link">UUID_SEQUENCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">System property that may be used to seed the UUID generation with an integer value.</div> |
| </div> |
| </div> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html" title="class or interface in java.util" class="external-link">UUID</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getTimeBasedUuid()" class="member-name-link">getTimeBasedUuid</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Generates Type 1 UUID.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="UUID_SEQUENCE"> |
| <h3>UUID_SEQUENCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="element-name">UUID_SEQUENCE</span></div> |
| <div class="block">System property that may be used to seed the UUID generation with an integer value.</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="../../../../../../constant-values.html#org.apache.logging.log4j.core.util.UuidUtil.UUID_SEQUENCE">Constant Field Values</a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getTimeBasedUuid()"> |
| <h3>getTimeBasedUuid</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html" title="class or interface in java.util" class="external-link">UUID</a></span> <span class="element-name">getTimeBasedUuid</span>()</div> |
| <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 class="notes"> |
| <dt>Returns:</dt> |
| <dd>universally unique identifiers (UUID)</dd> |
| </dl> |
| </section> |
| </li> |
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