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| org.apache.logging.log4j.core.helpers</FONT> |
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| Class UUIDUtil</H2> |
| <PRE> |
| <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
| <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.logging.log4j.core.helpers.UUIDUtil</B> |
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| <DT><PRE>public final class <A HREF="../../../../../../src-html/org/apache/logging/log4j/core/helpers/UUIDUtil.html#line.34"><B>UUIDUtil</B></A><DT>extends <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL> |
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| |
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| Generates a unique id. The generated UUID will be unique for approximately 8,925 years so long as |
| less than 4095 ids are generated per millisecond on the same device (as identified by its MAC adddress). |
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| <CODE>static <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/logging/log4j/core/helpers/UUIDUtil.html#UUID_SEQUENCE">UUID_SEQUENCE</A></B></CODE> |
| |
| <BR> |
| System property that may be used to seed the uuid generation with an integer value.</TD> |
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| <CODE>static <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/logging/log4j/core/helpers/UUIDUtil.html#getTimeBasedUUID()">getTimeBasedUUID</A></B>()</CODE> |
| |
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| Generates Type 1 UUID.</TD> |
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| <A NAME="UUID_SEQUENCE"><!-- --></A><H3> |
| UUID_SEQUENCE</H3> |
| <PRE> |
| public static final <A HREF="http://download.oracle.com/javase/1.5.0/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/helpers/UUIDUtil.html#line.38"><B>UUID_SEQUENCE</B></A></PRE> |
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| <DD>System property that may be used to seed the uuid generation with an integer value. |
| <P> |
| <DL> |
| <DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.logging.log4j.core.helpers.UUIDUtil.UUID_SEQUENCE">Constant Field Values</A></DL> |
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| |
| <A NAME="getTimeBasedUUID()"><!-- --></A><H3> |
| getTimeBasedUUID</H3> |
| <PRE> |
| public static <A HREF="http://download.oracle.com/javase/1.5.0/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/helpers/UUIDUtil.html#line.175"><B>getTimeBasedUUID</B></A>()</PRE> |
| <DL> |
| <DD>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. |
| </ol> |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>universally unique identifiers (UUID)</DL> |
| </DD> |
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