log4jMini/src/java/org/apache/log4j/examples/Trivial.java

package org.apache.log4j.examples;


import org.apache.log4j.Category;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.NDC;

/**
   View the <a href="doc-files/Trivial.java">source code</a> of this a
   trivial usage example. Running <code>java
   org.apache.log4j.examples.Trivial</code> should output something
   similar to:

   <pre>
      0    INFO  [main] org.apache.log4j.examples.Trivial (Client #45890) - Awake awake. Put on thy strength.
      15   DEBUG [main] org.apache.log4j.examples.Trivial (Client #45890 DB) - Now king David was old.
      278  INFO  [main] org.apache.log4j.examples.Trivial$InnerTrivial (Client #45890) - Entered foo.
      293  INFO  [main] org.apache.log4j.examples.Trivial (Client #45890) - Exiting Trivial.   
   </pre>
   
   <p> The increasing numbers at the beginning of each line are the
   times elapsed since the start of the program. The string between
   the parentheses is the nested diagnostic context.

   <p>See {@link Sort} and {@link SortAlgo} for sligtly more elaborate
   examples.

   <p>Note thent class files for the example code is not included in
   any of the distributed log4j jar files. You will have to add the
   directory <code>/dir-where-you-unpacked-log4j/classes</code> to
   your classpath before trying out the examples.

 */
public class Trivial {

  static Category cat = Category.getInstance(Trivial.class.getName());

  public static void main(String[] args) {
    BasicConfigurator.configure();
    NDC.push("Client #45890"); 

    cat.info("Awake awake. Put on thy strength.");
    Trivial.foo();
    InnerTrivial.foo();
    cat.info("Exiting Trivial.");    
  }

  static
  void foo() {
    NDC.push("DB"); 
    cat.debug("Now king David was old.");    
    NDC.pop(); 
  }

  static class InnerTrivial {
    static  Category cat = Category.getInstance(InnerTrivial.class.getName());

    static    
    void foo() {
      cat.info("Entered foo."); 
    }
  }
}