1/*
2 * Copyright (c) 2016, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
24
25#ifndef SHARE_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
26#define SHARE_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
27
28#include "jni.h"
29#include "jfr/recorder/storage/jfrMemorySpace.hpp"
30#include "jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp"
31#include "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp"
32
33class JfrChunkWriter;
34class JfrStringPool;
35class Mutex;
36
37typedef JfrMemorySpace<JfrStringPoolBuffer, JfrMspaceSequentialRetrieval, JfrStringPool> JfrStringPoolMspace;
38
39//
40// Although called JfrStringPool, a more succinct description would be
41// "backing storage for the string pool located in Java"
42//
43// There are no lookups in native, only the encoding of string constants to the stream.
44//
45class JfrStringPool : public JfrCHeapObj {
46 public:
47 static bool add(bool epoch, jlong id, jstring string, JavaThread* jt);
48 size_t write();
49 size_t write_at_safepoint();
50 size_t clear();
51
52 typedef JfrStringPoolMspace::Type Buffer;
53 private:
54 JfrStringPoolMspace* _free_list_mspace;
55 Mutex* _lock;
56 JfrChunkWriter& _chunkwriter;
57
58 // mspace callback
59 void register_full(Buffer* t, Thread* thread);
60 void lock();
61 void unlock();
62 DEBUG_ONLY(bool is_locked() const;)
63
64 static Buffer* lease_buffer(Thread* thread, size_t size = 0);
65 static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t);
66
67 JfrStringPool(JfrChunkWriter& cw);
68 ~JfrStringPool();
69
70 static JfrStringPool& instance();
71 static JfrStringPool* create(JfrChunkWriter& cw);
72 bool initialize();
73 static void destroy();
74
75 friend class JfrRecorder;
76 friend class JfrRecorderService;
77 friend class JfrStringPoolFlush;
78 friend class JfrStringPoolWriter;
79 template <typename, template <typename> class, typename>
80 friend class JfrMemorySpace;
81};
82
83#endif // SHARE_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
84