1/* 2 * Copyright (c) 2015, 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_VM_LOGGING_LOGFILEOUTPUT_HPP 25#define SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP 26 27#include "logging/logFileStreamOutput.hpp" 28#include "runtime/semaphore.hpp" 29#include "utilities/globalDefinitions.hpp" 30 31class LogDecorations; 32 33// The log file output, with support for file rotation based on a target size. 34class LogFileOutput : public LogFileStreamOutput { 35 private: 36 static const char* FileOpenMode; 37 static const char* FileCountOptionKey; 38 static const char* FileSizeOptionKey; 39 static const char* PidFilenamePlaceholder; 40 static const char* TimestampFilenamePlaceholder; 41 static const char* TimestampFormat; 42 static const size_t DefaultFileCount = 5; 43 static const size_t DefaultFileSize = 20 * M; 44 static const size_t StartTimeBufferSize = 20; 45 static const size_t PidBufferSize = 21; 46 static const uint MaxRotationFileCount = 1000; 47 static char _pid_str[PidBufferSize]; 48 static char _vm_start_time_str[StartTimeBufferSize]; 49 50 const char* _name; 51 char* _file_name; 52 char* _archive_name; 53 54 uint _current_file; 55 uint _file_count; 56 uint _file_count_max_digits; 57 58 size_t _archive_name_len; 59 size_t _rotate_size; 60 size_t _current_size; 61 62 // Semaphore used for synchronizing file rotations and writes 63 Semaphore _rotation_semaphore; 64 65 void archive(); 66 void rotate(); 67 bool parse_options(const char* options, outputStream* errstream); 68 char *make_file_name(const char* file_name, const char* pid_string, const char* timestamp_string); 69 70 bool should_rotate() { 71 return _file_count > 0 && _rotate_size > 0 && _current_size >= _rotate_size; 72 } 73 74 void increment_file_count() { 75 _current_file++; 76 if (_current_file == _file_count) { 77 _current_file = 0; 78 } 79 } 80 81 public: 82 LogFileOutput(const char *name); 83 virtual ~LogFileOutput(); 84 virtual bool initialize(const char* options, outputStream* errstream); 85 virtual int write(const LogDecorations& decorations, const char* msg); 86 virtual int write(LogMessageBuffer::Iterator msg_iterator); 87 virtual void force_rotate(); 88 virtual void describe(outputStream *out); 89 90 virtual const char* name() const { 91 return _name; 92 } 93 94 static const char* Prefix; 95 static void set_file_name_parameters(jlong start_time); 96}; 97 98#endif // SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP 99