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.
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23 */
24#ifndef SHARE_JFR_RECORDER_REPOSITORY_JFRREPOSITORY_HPP
25#define SHARE_JFR_RECORDER_REPOSITORY_JFRREPOSITORY_HPP
26
27#include "jni.h"
28#include "jfr/utilities/jfrAllocation.hpp"
29
30class JfrChunkWriter;
31class JfrPostBox;
32
33//
34// Represents the location on disk where internal files, "chunks", are stored.
35//
36// A "chunk" is a self-contained file artifact storing events and metadata that
37// has been moved out of process memory.
38//
39// Chunk files are associated with recordings and are managed at a higher level in Java.
40// Java continously keeps the VM informed about new chunk locations via set_chunk_path().
41//
42// A JfrChunkWriter will open the next chunk file which it maintains as the current chunk.
43// There is a rotation scheme in place for creating new chunks at certain intervals.
44//
45class JfrRepository : public JfrCHeapObj {
46 friend class JfrRecorder;
47 friend class JfrRecorderService;
48 private:
49 char* _path;
50 JfrPostBox& _post_box;
51
52 JfrRepository(JfrPostBox& post_box);
53 ~JfrRepository();
54
55 bool set_path(const char* path);
56 void set_chunk_path(const char* path);
57 bool open_chunk(bool vm_error = false);
58 size_t close_chunk(int64_t metadata_offset);
59 void on_vm_error();
60 static void notify_on_new_chunk_path();
61 static JfrChunkWriter& chunkwriter();
62
63 static JfrRepository& instance();
64 static JfrRepository* create(JfrPostBox& post_box);
65 bool initialize();
66 static void destroy();
67
68 public:
69 static void set_path(jstring location, JavaThread* jt);
70 static void set_chunk_path(jstring path, JavaThread* jt);
71};
72
73#endif // SHARE_JFR_RECORDER_REPOSITORY_JFRREPOSITORY_HPP
74