1 /* 2 * Copyright (c) 2012, 2020, 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 #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 30 class JfrChunkWriter; 31 class 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 // 45 class 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(); 59 size_t flush_chunk(); 60 void on_vm_error(); 61 62 static void notify_on_new_chunk_path(); 63 static JfrChunkWriter& chunkwriter(); 64 65 static JfrRepository& instance(); 66 static JfrRepository* create(JfrPostBox& post_box); 67 bool initialize(); 68 static void destroy(); 69 70 public: 71 static void set_path(jstring location, JavaThread* jt); 72 static void set_chunk_path(jstring path, JavaThread* jt); 73 static void mark_chunk_final(); 74 static void flush(JavaThread* jt); 75 static jlong current_chunk_start_nanos(); 76 static void on_vm_error_report(outputStream* st); 77 }; 78 79 #endif // SHARE_JFR_RECORDER_REPOSITORY_JFRREPOSITORY_HPP