1/*
2 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jfr/jni/jfrJavaSupport.hpp"
27#include "jfr/recorder/repository/jfrChunkRotation.hpp"
28#include "jfr/recorder/repository/jfrChunkWriter.hpp"
29#include "runtime/handles.inline.hpp"
30
31static jobject chunk_monitor = NULL;
32static int64_t threshold = 0;
33static bool rotate = false;
34
35static jobject install_chunk_monitor(Thread* thread) {
36 assert(chunk_monitor == NULL, "invariant");
37 // read static field
38 HandleMark hm(thread);
39 static const char klass[] = "jdk/jfr/internal/JVM";
40 static const char field[] = "FILE_DELTA_CHANGE";
41 static const char signature[] = "Ljava/lang/Object;";
42 JavaValue result(T_OBJECT);
43 JfrJavaArguments field_args(&result, klass, field, signature, thread);
44 JfrJavaSupport::get_field_global_ref(&field_args, thread);
45 chunk_monitor = result.get_jobject();
46 return chunk_monitor;
47}
48
49// lazy install
50static jobject get_chunk_monitor(Thread* thread) {
51 return chunk_monitor != NULL ? chunk_monitor : install_chunk_monitor(thread);
52}
53
54static void notify() {
55 Thread* const thread = Thread::current();
56 JfrJavaSupport::notify_all(get_chunk_monitor(thread), thread);
57}
58
59void JfrChunkRotation::evaluate(const JfrChunkWriter& writer) {
60 assert(threshold > 0, "invariant");
61 if (rotate) {
62 // already in progress
63 return;
64 }
65 if (writer.size_written() > threshold) {
66 rotate = true;
67 notify();
68 }
69}
70
71bool JfrChunkRotation::should_rotate() {
72 return rotate;
73}
74
75void JfrChunkRotation::on_rotation() {
76 rotate = false;
77}
78
79void JfrChunkRotation::set_threshold(int64_t bytes) {
80 threshold = bytes;
81}
82