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/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <common/trace.h>
#include <log/log.h>
#include <utils/Errors.h>
#include <utils/Timers.h>
#include <chrono>
#include <fstream>
namespace android {
class SurfaceFlinger;
template <typename FileProto, typename EntryProto>
class TransactionRingBuffer {
public:
size_t size() const { return mSizeInBytes; }
size_t used() const { return mUsedInBytes; }
size_t frameCount() const { return mStorage.size(); }
void setSize(size_t newSize) { mSizeInBytes = newSize; }
const std::string& front() const { return mStorage.front(); }
const std::string& back() const { return mStorage.back(); }
void reset() {
// use the swap trick to make sure memory is released
std::deque<std::string>().swap(mStorage);
mUsedInBytes = 0U;
}
void writeToProto(FileProto& fileProto) const {
fileProto.mutable_entry()->Reserve(static_cast<int>(mStorage.size()) +
fileProto.entry().size());
for (const std::string& entry : mStorage) {
EntryProto* entryProto = fileProto.add_entry();
entryProto->ParseFromString(entry);
}
}
status_t appendToStream(FileProto& fileProto, std::ofstream& out) {
SFTRACE_CALL();
writeToProto(fileProto);
std::string output;
if (!fileProto.SerializeToString(&output)) {
ALOGE("Could not serialize proto.");
return UNKNOWN_ERROR;
}
out << output;
return NO_ERROR;
}
std::vector<std::string> emplace(std::string&& serializedProto) {
std::vector<std::string> replacedEntries;
size_t protoSize = static_cast<size_t>(serializedProto.size());
while (mUsedInBytes + protoSize > mSizeInBytes) {
if (mStorage.empty()) {
return {};
}
mUsedInBytes -= static_cast<size_t>(mStorage.front().size());
replacedEntries.emplace_back(mStorage.front());
mStorage.pop_front();
}
mUsedInBytes += protoSize;
mStorage.emplace_back(serializedProto);
return replacedEntries;
}
std::vector<std::string> emplace(EntryProto&& proto) {
std::string serializedProto;
proto.SerializeToString(&serializedProto);
return emplace(std::move(serializedProto));
}
void dump(std::string& result) const {
std::chrono::milliseconds duration(0);
if (frameCount() > 0) {
EntryProto entry;
entry.ParseFromString(mStorage.front());
duration = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::nanoseconds(systemTime() - entry.elapsed_realtime_nanos()));
}
const int64_t durationCount = duration.count();
base::StringAppendF(&result,
" number of entries: %zu (%.2fMB / %.2fMB) duration: %" PRIi64 "ms\n",
frameCount(), float(used()) / (1024.f * 1024.f),
float(size()) / (1024.f * 1024.f), durationCount);
}
private:
size_t mUsedInBytes = 0U;
size_t mSizeInBytes = 0U;
std::deque<std::string> mStorage;
};
} // namespace android
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