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1
5 package org.h2.util;
6
7 public class MemoryUtils {
8
9 private static long lastGC;
10 private static int GC_DELAY = 50;
11 private static int MAX_GC = 8;
12
13 public static int getMemoryUsed() {
14 collectGarbage();
15 Runtime  rt = Runtime.getRuntime();
16 long mem = rt.totalMemory() - rt.freeMemory();
17 return (int) (mem >> 10);
18 }
19
20 public static int getMemoryFree() {
21 collectGarbage();
22 Runtime rt = Runtime.getRuntime();
23 long mem = rt.freeMemory();
24 return (int) (mem >> 10);
25 }
26
27 private static synchronized void collectGarbage() {
28 Runtime runtime = Runtime.getRuntime();
29 long total = runtime.totalMemory();
30 long time = System.currentTimeMillis();
31 if (lastGC + GC_DELAY < time) {
32 for (int i = 0; i < MAX_GC; i++) {
33 runtime.gc();
34 long now = runtime.totalMemory();
35 if (now == total) {
36 lastGC = System.currentTimeMillis();
37 break;
38 }
39 total = now;
40 }
41 }
42 }
43
44 }
45 |
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