129 lines
4.2 KiB
C++
129 lines
4.2 KiB
C++
/*
|
|
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*
|
|
*/
|
|
#ifndef SHARE_VM_LOGGING_LOGOUTPUTLIST_HPP
|
|
#define SHARE_VM_LOGGING_LOGOUTPUTLIST_HPP
|
|
|
|
#include "logging/logLevel.hpp"
|
|
#include "memory/allocation.hpp"
|
|
#include "runtime/atomic.hpp"
|
|
#include "utilities/globalDefinitions.hpp"
|
|
|
|
class LogOutput;
|
|
|
|
// Data structure to keep track of log outputs for a given tagset.
|
|
// Essentially a sorted linked list going from error level outputs
|
|
// to outputs of finer levels. Keeps an index from each level to
|
|
// the first node in the list for the corresponding level.
|
|
// This allows a log message on, for example, info level to jump
|
|
// straight into the list where the first info level output can
|
|
// be found. The log message will then be printed on that output,
|
|
// as well as all outputs in nodes that follow in the list (which
|
|
// can be additional info level outputs and/or debug and trace outputs).
|
|
//
|
|
// Each instance keeps track of the number of current readers of the list.
|
|
// To remove a node from the list the node must first be unlinked,
|
|
// and the memory for that node can be freed whenever the removing
|
|
// thread observes an active reader count of 0 (after unlinking it).
|
|
class LogOutputList VALUE_OBJ_CLASS_SPEC {
|
|
private:
|
|
struct LogOutputNode : public CHeapObj<mtLogging> {
|
|
LogOutput* _value;
|
|
LogOutputNode* _next;
|
|
LogLevelType _level;
|
|
};
|
|
|
|
LogOutputNode* _level_start[LogLevel::Count];
|
|
volatile jint _active_readers;
|
|
|
|
LogOutputNode* find(const LogOutput* output) const;
|
|
void remove_output(LogOutputNode* node);
|
|
void add_output(LogOutput* output, LogLevelType level);
|
|
void update_output_level(LogOutputNode* node, LogLevelType level);
|
|
|
|
public:
|
|
LogOutputList() : _active_readers(0) {
|
|
for (size_t i = 0; i < LogLevel::Count; i++) {
|
|
_level_start[i] = NULL;
|
|
}
|
|
}
|
|
|
|
// Test if the outputlist has an output for the given level.
|
|
bool is_level(LogLevelType level) const {
|
|
return _level_start[level] != NULL;
|
|
}
|
|
|
|
LogLevelType level_for(const LogOutput* output) const {
|
|
LogOutputNode* node = this->find(output);
|
|
if (node == NULL) {
|
|
return LogLevel::Off;
|
|
}
|
|
return node->_level;
|
|
}
|
|
|
|
// Set (add/update/remove) the output to the specified level.
|
|
void set_output_level(LogOutput* output, LogLevelType level);
|
|
|
|
// Bookkeeping functions to keep track of number of active readers/iterators for the list.
|
|
jint increase_readers();
|
|
jint decrease_readers();
|
|
void wait_until_no_readers() const;
|
|
|
|
class Iterator VALUE_OBJ_CLASS_SPEC {
|
|
friend class LogOutputList;
|
|
private:
|
|
LogOutputNode* _current;
|
|
LogOutputList* _list;
|
|
Iterator(LogOutputList* list, LogOutputNode* start) : _current(start), _list(list) {
|
|
}
|
|
|
|
public:
|
|
~Iterator() {
|
|
_list->decrease_readers();
|
|
}
|
|
|
|
LogOutput* operator*() {
|
|
return _current->_value;
|
|
}
|
|
|
|
void operator++(int) {
|
|
_current = _current->_next;
|
|
}
|
|
|
|
bool operator!=(const LogOutputNode *ref) const {
|
|
return _current != ref;
|
|
}
|
|
};
|
|
|
|
Iterator iterator(LogLevelType level = LogLevel::Last) {
|
|
increase_readers();
|
|
return Iterator(this, _level_start[level]);
|
|
}
|
|
|
|
LogOutputNode* end() const {
|
|
return NULL;
|
|
}
|
|
};
|
|
|
|
#endif // SHARE_VM_LOGGING_LOGOUTPUTLIST_HPP
|