TimeLogger class

TimeLogger.java

package com.foo.bar.baz

import rx.functions.Action0;
import rx.functions.Func0;
import timber.log.Timber;

import java.io.Closeable;

public class TimeLogger implements Closeable
{
    private final long startTime;
    private final String where;
    private final String what;
    private int lapIndex;
    private long lapStartTime;

    private TimeLogger(String where, String what)
    {
        this.where = where;
        this.what = what;
        this.startTime = System.nanoTime();
        this.lapIndex = 0;
        this.lapStartTime = this.startTime;
    }

    public static <T> T measure(Func0<T> func, String where, String what)
    {
        try (TimeLogger ignored = new TimeLogger(where, what))
        {
            return func.call();
        }
    }

    public static void measure(Action0 action, String where, String what)
    {
        try (TimeLogger ignored = new TimeLogger(where, what))
        {
            action.call();
        }
    }

    public static TimeLogger start(String where, String what)
    {
        return new TimeLogger(where, what);
    }

    public void lapFinished()
    {
        lapFinished(null);
    }

    public void lapFinished(String lapName)
    {
        long nextLapStartTime = System.nanoTime();
        long duration = (nextLapStartTime - lapStartTime) / 1000000;
        Timber.d("[%s]    {%s} lap in {%s} took %d ms", where, lapName != null ? lapName : String.valueOf(lapIndex), what, duration);
        lapIndex++;
        lapStartTime = nextLapStartTime;
    }

    @Override
    public void close()
    {
        long endTime = System.nanoTime();
        long duration = (endTime - startTime) / 1000000;
        Timber.d("[%s] {%s} took %d ms", where, what, duration);
    }
}