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. 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_JFR_UTILITIES_JFRBLOB_HPP 26 #define SHARE_JFR_UTILITIES_JFRBLOB_HPP 27 28 #include "jfr/utilities/jfrAllocation.hpp" 29 #include "jfr/utilities/jfrRefCountPointer.hpp" 30 31 class JfrBlob; 32 typedef RefCountPointer<JfrBlob, MultiThreadedRefCounter> JfrBlobReference; 33 typedef RefCountHandle<JfrBlobReference> JfrBlobHandle; 34 35 class JfrBlob : public JfrCHeapObj { 36 template <typename, typename> 37 friend class RefCountPointer; 38 private: 39 const u1* const _data; 40 JfrBlobHandle _next; 41 const size_t _size; 42 mutable bool _written; 43 44 JfrBlob(const u1* data, size_t size); 45 ~JfrBlob(); 46 47 public: 48 void set_next(const JfrBlobHandle& ref); 49 void reset_write_state() const; 50 static JfrBlobHandle make(const u1* data, size_t size); 51 template <typename Writer> write(Writer & writer) const52 void write(Writer& writer) const { 53 writer.write_bytes(_data, _size); 54 if (_next.valid()) { 55 _next->write(writer); 56 } 57 } 58 template <typename Writer> exclusive_write(Writer & writer) const59 void exclusive_write(Writer& writer) const { 60 if (_written) { 61 return; 62 } 63 writer.write_bytes(_data, _size); 64 _written = true; 65 if (_next.valid()) { 66 _next->exclusive_write(writer); 67 } 68 } 69 }; 70 71 #endif // SHARE_JFR_UTILITIES_JFRBLOB_HPP 72