/
Main.java
62 lines (58 loc) · 2.44 KB
/
Main.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apidesign.demo.heapdump;
import java.io.File;
import java.io.IOException;
import org.netbeans.lib.profiler.heap.Heap;
import org.netbeans.lib.profiler.heap.HeapFactory;
import org.netbeans.modules.profiler.oql.engine.api.OQLEngine;
import org.netbeans.modules.profiler.oql.engine.api.OQLException;
public class Main {
public static void main(String... args) throws Exception {
String fileName = args.length > 0 ? args[0] : "dump.hprof";
final File file = new File(fileName);
if (!file.exists()) {
throw new IOException("Cannot find " + file);
}
System.err.println("Loading " + file);
Heap heap = HeapFactory.createHeap(file);
System.err.println("Querying the heap");
queryHeap(heap);
}
static void queryHeap(Heap heap) throws OQLException {
final OQLEngine eng = new OQLEngine(heap);
for (int i = 1; i <= 20; i++) {
long now = System.currentTimeMillis();
eng.executeQuery(
"var arr = [];\n" +
"heap.forEachObject(function(o) {\n" +
" if (o.length > 255) {\n" +
" arr.push(o);\n" +
" }\n" +
"}, 'int[]')\n" +
"print('Found ' + arr.length + ' long int arrays');"
, OQLEngine.ObjectVisitor.DEFAULT);
long took = System.currentTimeMillis() - now;
System.err.println("Round #" + i + " took " + took + " ms");
}
}
static {
System.setProperty("polyglot.js.nashorn-compat", "true");
}
}