1 /* 2 * Copyright (c) 2016, 2018, 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 #ifndef SHARE_VM_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP 26 #define SHARE_VM_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 33 class JfrChunkWriter; 34 class JfrStringPool; 35 class Mutex; 36 37 typedef 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 // 45 class 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_VM_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP 84