1 package org.mockitoutil; 2 3 import static java.lang.String.format; 4 import static java.lang.System.nanoTime; 5 import static java.util.concurrent.TimeUnit.NANOSECONDS; 6 7 import java.util.concurrent.TimeUnit; 8 import org.mockito.exceptions.base.MockitoAssertionError; 9 10 /** 11 * This class can be uses as stopwatch to assert that a given time is elapsed or not. 12 */ 13 public class Stopwatch { 14 15 /** 16 * The start time in nano seconds or <code>null</code> if this stop watch was not started yet 17 */ 18 private Long startNanos = null; 19 20 /** 21 * To create an instance use {@link #createNotStarted()} 22 */ 23 private Stopwatch() { 24 } 25 26 /** 27 * Return a new and not started {@link Stopwatch}. 28 */ 29 public static Stopwatch createNotStarted() { 30 return new Stopwatch(); 31 } 32 33 public void start() { 34 if (startNanos != null) 35 throw new IllegalStateException("This stop watch is already started!"); 36 37 startNanos = nanoTime(); 38 } 39 40 public void assertElapsedTimeIsMoreThan(long expected, TimeUnit unit) { 41 long elapsedNanos = elapsedNanos(); 42 long expectedNanos = unit.toNanos(expected); 43 44 if (elapsedNanos <= expectedNanos) 45 fail("Expected that more than %dms elapsed! But was: %dms", expectedNanos, elapsedNanos); 46 } 47 48 public void assertElapsedTimeIsLessThan(long expected, TimeUnit unit) { 49 long elapsedNanos = elapsedNanos(); 50 long expectedNanos = unit.toNanos(expected); 51 52 if (elapsedNanos >= expectedNanos) 53 fail("Expected that less than %dms elapsed! But was: %dms", expectedNanos, elapsedNanos); 54 } 55 56 private long elapsedNanos() { 57 if (startNanos == null) 58 throw new IllegalStateException("This stop watch is not started!"); 59 return nanoTime() - startNanos; 60 } 61 62 private static void fail(String message, long expectedNanos, long elapsedNanos) { 63 throw new MockitoAssertionError(format(message, NANOSECONDS.toMillis(expectedNanos), NANOSECONDS.toMillis(elapsedNanos))); 64 } 65 } 66
