84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <atomic>
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#include <list>
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#include <mutex>
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#include "LogBuffer.h"
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#include "LogBufferElement.h"
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#include "LogReaderList.h"
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#include "LogStatistics.h"
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#include "LogTags.h"
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#include "LogdLock.h"
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class SimpleLogBuffer : public LogBuffer {
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public:
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SimpleLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats);
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~SimpleLogBuffer();
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void Init() override final;
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int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
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uint16_t len) override;
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std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask)
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REQUIRES(logd_lock) override;
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bool FlushTo(LogWriter* writer, FlushToState& state,
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const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
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log_time realtime)>& filter)
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REQUIRES(logd_lock) override;
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bool Clear(log_id_t id, uid_t uid) override;
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size_t GetSize(log_id_t id) override;
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bool SetSize(log_id_t id, size_t size) override final;
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uint64_t sequence() const override { return sequence_.load(std::memory_order_relaxed); }
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protected:
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virtual bool Prune(log_id_t id, unsigned long prune_rows, uid_t uid) REQUIRES(logd_lock);
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virtual void LogInternal(LogBufferElement&& elem) REQUIRES(logd_lock);
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// Returns an iterator to the oldest element for a given log type, or logs_.end() if
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// there are no logs for the given log type. Requires logs_logd_lock to be held.
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std::list<LogBufferElement>::iterator GetOldest(log_id_t log_id) REQUIRES(logd_lock);
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std::list<LogBufferElement>::iterator Erase(std::list<LogBufferElement>::iterator it)
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REQUIRES(logd_lock);
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void KickReader(LogReaderThread* reader, log_id_t id, unsigned long prune_rows)
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REQUIRES(logd_lock);
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LogStatistics* stats() { return stats_; }
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LogReaderList* reader_list() { return reader_list_; }
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size_t max_size(log_id_t id) REQUIRES_SHARED(logd_lock) { return max_size_[id]; }
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std::list<LogBufferElement>& logs() { return logs_; }
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private:
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bool ShouldLog(log_id_t log_id, const char* msg, uint16_t len);
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void MaybePrune(log_id_t id) REQUIRES(logd_lock);
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LogReaderList* reader_list_;
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LogTags* tags_;
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LogStatistics* stats_;
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std::atomic<uint64_t> sequence_ = 1;
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size_t max_size_[LOG_ID_MAX] GUARDED_BY(logd_lock);
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std::list<LogBufferElement> logs_ GUARDED_BY(logd_lock);
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// Keeps track of the iterator to the oldest log message of a given log type, as an
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// optimization when pruning logs. Use GetOldest() to retrieve.
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std::optional<std::list<LogBufferElement>::iterator> oldest_[LOG_ID_MAX] GUARDED_BY(logd_lock);
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};
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