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_LOGOUTPUT_HPP
25#define SHARE_VM_LOGGING_LOGOUTPUT_HPP
26
27#include "logging/logDecorators.hpp"
28#include "logging/logLevel.hpp"
29#include "logging/logMessageBuffer.hpp"
30#include "memory/allocation.hpp"
31#include "utilities/globalDefinitions.hpp"
32
33class LogDecorations;
34class LogMessageBuffer;
35class LogTagSet;
36
37// The base class/interface for log outputs.
38// Keeps track of the latest configuration string,
39// and its selected decorators.
40class LogOutput : public CHeapObj<mtLogging> {
41  // Make LogConfiguration a friend to allow it to modify the configuration string.
42  friend class LogConfiguration;
43
44 private:
45  static const size_t InitialConfigBufferSize = 256;
46  char* _config_string;
47  size_t _config_string_buffer_size;
48
49 protected:
50  LogDecorators _decorators;
51
52  // Clears any previous config description in preparation of reconfiguration.
53  void clear_config_string();
54  // Adds the tagset on the given level to the config description (e.g. "tag1+tag2=level").
55  void add_to_config_string(const LogTagSet* ts, LogLevelType level);
56  // Replaces the current config description with the given string.
57  void set_config_string(const char* string);
58
59 public:
60  void set_decorators(const LogDecorators &decorators) {
61    _decorators = decorators;
62  }
63
64  const LogDecorators& decorators() const {
65    return _decorators;
66  }
67
68  const char* config_string() const {
69    return _config_string;
70  }
71
72  LogOutput() : _config_string(NULL), _config_string_buffer_size(0) {
73  }
74
75  virtual ~LogOutput();
76
77  // If the output can be rotated, trigger a forced rotation, otherwise do nothing.
78  // Log outputs with rotation capabilities should override this.
79  virtual void force_rotate() {
80    // Do nothing by default.
81  }
82
83  virtual void describe(outputStream *out);
84
85  virtual const char* name() const = 0;
86  virtual bool initialize(const char* options, outputStream* errstream) = 0;
87  virtual int write(const LogDecorations& decorations, const char* msg) = 0;
88  virtual int write(LogMessageBuffer::Iterator msg_iterator) = 0;
89};
90
91#endif // SHARE_VM_LOGGING_LOGOUTPUT_HPP
92