log4j-2.0-alpha1/log4j-core/apidocs/org/apache/logging/log4j/core/helpers/UUIDUtil.html - logging-log4j-site - Git at Google

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 <FONT SIZE="-1">
 org.apache.logging.log4j.core.helpers</FONT>
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 Class UUIDUtil</H2>
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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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 <P>
 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).
 <P>

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 <TD><CODE><B><A HREF="../../../../../../org/apache/logging/log4j/core/helpers/UUIDUtil.html#UUID_SEQUENCE">UUID_SEQUENCE</A></B></CODE>

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 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System property that may be used to seed the uuid generation with an integer value.</TD>
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 <CODE>static&nbsp;<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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 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>
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 <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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	Class UUIDUtil</H2>
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	<P>
	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).
	<P>

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	<HR>

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	<TD><CODE><B><A HREF="../../../../../../org/apache/logging/log4j/core/helpers/UUIDUtil.html#UUID_SEQUENCE">UUID_SEQUENCE</A></B></CODE>

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	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>
	<DL>
	<DD>System property that may be used to seed the uuid generation with an integer value.
	<P>
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	<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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