org.glassfish.admin.amx.util.PrintMillis Maven / Gradle / Ivy

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package org.glassfish.admin.amx.util;

/**
Useful for printing elapsed timings out. Example:


final PrintMillis	timer	= new PrintMillis();
...
timer.println( "start" );
...
timer.println( "middle" );
...
...
timer.println( "end" );

 */
public class PrintMillis
{
    private long mLast = System.currentTimeMillis();

    public PrintMillis()
    {
        mLast = System.currentTimeMillis();
    }

    /**
    Print out the milliseconds that have elapsed since the last call.
     */
    public void println(String msg)
    {
        final long elapsed = System.currentTimeMillis() - mLast;

        // this printing to System.out is BY DESIGN, so leave it.
        System.out.println((msg == null ? "" : msg) + ": " + elapsed);

        mLast = System.currentTimeMillis();
    }

}