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| MDC (Apache Log4j 1.2.17 API) |
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| org.apache.log4j</FONT> |
| <BR> |
| Class MDC</H2> |
| <PRE> |
| <A HREF="http://java.sun.com/j2se/1.4.2/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.log4j.MDC</B> |
| </PRE> |
| <HR> |
| <DL> |
| <DT><PRE>public class <B>MDC</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL> |
| </PRE> |
| |
| <P> |
| The MDC class is similar to the <A HREF="../../../org/apache/log4j/NDC.html" title="class in org.apache.log4j"><CODE>NDC</CODE></A> class except that it is |
| based on a map instead of a stack. It provides <em>mapped |
| diagnostic contexts</em>. A <em>Mapped Diagnostic Context</em>, or |
| MDC in short, is an instrument for distinguishing interleaved log |
| output from different sources. Log output is typically interleaved |
| when a server handles multiple clients near-simultaneously. |
| |
| <p><b><em>The MDC is managed on a per thread basis</em></b>. A |
| child thread automatically inherits a <em>copy</em> of the mapped |
| diagnostic context of its parent. |
| |
| <p>The MDC class requires JDK 1.2 or above. Under JDK 1.1 the MDC |
| will always return empty values but otherwise will not affect or |
| harm your application. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Since:</B></DT> |
| <DD>1.2</DD> |
| <DT><B>Author:</B></DT> |
| <DD>Ceki Gülcü</DD> |
| </DL> |
| <HR> |
| |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| <B>Method Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/log4j/MDC.html#clear()">clear</A></B>()</CODE> |
| |
| <BR> |
| Remove all values from the MDC.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/log4j/MDC.html#get(java.lang.String)">get</A></B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key)</CODE> |
| |
| <BR> |
| Get the context identified by the <code>key</code> parameter.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/util/Hashtable.html?is-external=true" title="class or interface in java.util">Hashtable</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/log4j/MDC.html#getContext()">getContext</A></B>()</CODE> |
| |
| <BR> |
| Get the current thread's MDC as a hashtable.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/log4j/MDC.html#put(java.lang.String, java.lang.Object)">put</A></B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key, |
| <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</CODE> |
| |
| <BR> |
| Put a context value (the <code>o</code> parameter) as identified |
| with the <code>key</code> parameter into the current thread's |
| context map.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../org/apache/log4j/MDC.html#remove(java.lang.String)">remove</A></B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key)</CODE> |
| |
| <BR> |
| Remove the the context identified by the <code>key</code> |
| parameter.</TD> |
| </TR> |
| </TABLE> |
| <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| |
| <A NAME="put(java.lang.String, java.lang.Object)"><!-- --></A><H3> |
| put</H3> |
| <PRE> |
| public static void <B>put</B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key, |
| <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</PRE> |
| <DL> |
| <DD>Put a context value (the <code>o</code> parameter) as identified |
| with the <code>key</code> parameter into the current thread's |
| context map. |
| |
| <p>If the current thread does not have a context map it is |
| created as a side effect. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="get(java.lang.String)"><!-- --></A><H3> |
| get</H3> |
| <PRE> |
| public static <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>get</B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key)</PRE> |
| <DL> |
| <DD>Get the context identified by the <code>key</code> parameter. |
| |
| <p>This method has no side effects. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="remove(java.lang.String)"><!-- --></A><H3> |
| remove</H3> |
| <PRE> |
| public static void <B>remove</B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> key)</PRE> |
| <DL> |
| <DD>Remove the the context identified by the <code>key</code> |
| parameter. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getContext()"><!-- --></A><H3> |
| getContext</H3> |
| <PRE> |
| public static <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/util/Hashtable.html?is-external=true" title="class or interface in java.util">Hashtable</A> <B>getContext</B>()</PRE> |
| <DL> |
| <DD>Get the current thread's MDC as a hashtable. This method is |
| intended to be used internally. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="clear()"><!-- --></A><H3> |
| clear</H3> |
| <PRE> |
| public static void <B>clear</B>()</PRE> |
| <DL> |
| <DD>Remove all values from the MDC. |
| <P> |
| <DD><DL> |
| <DT><B>Since:</B></DT> |
| <DD>1.2.16</DD> |
| </DL> |
| </DD> |
| </DL> |
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