logmethod.html

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<TITLE>Logging a Method Call
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  <h3>
    e387.  
    Logging a Method Call</h3>

The logger provides convenience methods <code>Logger.entering()</code> and
<code>Logger.exiting()</code> for logging method calls.  This example implements a
method that logs the parameters upon entry and the result when returning.

<P>
See also <a href="../java.util.logging/LogExcept.html" class="eglink"><font size="-1"><b>e388</b> Logging an Exception</font></a>.


<pre>
    package <font color="#0066ff"><i>com.mycompany</i></font>;
    class <font color="#0066ff"><i>MyClass</i></font> {
        public boolean <font color="#0066ff"><i>myMethod</i></font>(int p1, Object p2) {
            // Log entry
            Logger logger = Logger.getLogger(<font color="#0066ff"><i>"com.mycompany.MyClass"</i></font>);
            if (logger.isLoggable(Level.FINER)) {
                logger.entering(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>,
                                new Object[]{new Integer(p1), p2});
            }
    
            // Method body
    
            // Log exit
            boolean result = <font color="#0066ff"><i>true</i></font>;
            if (logger.isLoggable(Level.FINER)) {
                logger.exiting(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>, new Boolean(result));
    
                // Use the following if the method does not return a value
                logger.exiting(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>);
            }
            return result;
         }
    }
</pre>
Here is a sample of the output using a simple formatter and the
following call:

<pre>
    new <font color="#0066ff"><i>com.mycompany.MyClass</i></font>().<font color="#0066ff"><i>myMethod</i></font>(<font color="#0066ff"><i>123</i></font>, <font color="#0066ff"><i>"hello"</i></font>);
    
    Jan 10, 2002 7:59:48 PM com.mycompany.MyClass myMethod
    FINER: ENTRY 123 hello
    Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
    FINER: RETURN true
    Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
    FINER: RETURN
</pre>
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            &nbsp;Related Examples
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e385. <a class="eglink" href="BasicLogging.html?l=rel">
    The Quintessential Logging Program
</a>
<br>

e386. <a class="eglink" href="IsLog.html?l=rel">
    Determining If a Message Will Be Logged
</a>
<br>

e388. <a class="eglink" href="LogExcept.html?l=rel">
    Logging an Exception
</a>
<br>

e389. <a class="eglink" href="Minimize.html?l=rel">
    Minimizing the Impact of Logging Code
</a>
<br>

e390. <a class="eglink" href="NoParent.html?l=rel">
    Preventing a Logger from Forwarding Log Records to its Parent
</a>
<br>

e391. <a class="eglink" href="LogFile.html?l=rel">
    Writing Log Records to a Log File
</a>
<br>

e392. <a class="eglink" href="LogConsole.html?l=rel">
    Writing Log Records to Standard Error
</a>
<br>

e393. <a class="eglink" href="LogMemory.html?l=rel">
    Writing Log Records Only After a Condition Occurs
</a>
<br>

e394. <a class="eglink" href="SetFilter.html?l=rel">
    Setting a Filter on a Logger Handler
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Configuration">
    Configuration
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#File%20Size">
    File Size
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Formatters">
    Formatters
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Levels">
    Levels
</a>&nbsp;&nbsp;

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