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/*
* Copyright 2019 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.
*/
//#define LOG_NDEBUG 0
#undef LOG_TAG
#define LOG_TAG "ClientCache"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include <cinttypes>
#include "ClientCache.h"
namespace android {
ANDROID_SINGLETON_STATIC_INSTANCE(ClientCache);
ClientCache::ClientCache() : mDeathRecipient(new CacheDeathRecipient) {}
bool ClientCache::getBuffer(const client_cache_t& cacheId,
ClientCacheBuffer** outClientCacheBuffer) {
auto& [processToken, id] = cacheId;
if (processToken == nullptr) {
ALOGE("failed to get buffer, invalid (nullptr) process token");
return false;
}
auto it = mBuffers.find(processToken);
if (it == mBuffers.end()) {
ALOGE("failed to get buffer, invalid process token");
return false;
}
auto& processBuffers = it->second;
auto bufItr = processBuffers.find(id);
if (bufItr == processBuffers.end()) {
ALOGE("failed to get buffer, invalid buffer id");
return false;
}
ClientCacheBuffer& buf = bufItr->second;
*outClientCacheBuffer = &buf;
return true;
}
bool ClientCache::add(const client_cache_t& cacheId, const sp<GraphicBuffer>& buffer) {
auto& [processToken, id] = cacheId;
if (processToken == nullptr) {
ALOGE("failed to cache buffer: invalid process token");
return false;
}
if (!buffer) {
ALOGE("failed to cache buffer: invalid buffer");
return false;
}
std::lock_guard lock(mMutex);
sp<IBinder> token;
// If this is a new process token, set a death recipient. If the client process dies, we will
// get a callback through binderDied.
auto it = mBuffers.find(processToken);
if (it == mBuffers.end()) {
token = processToken.promote();
if (!token) {
ALOGE("failed to cache buffer: invalid token");
return false;
}
status_t err = token->linkToDeath(mDeathRecipient);
if (err != NO_ERROR) {
ALOGE("failed to cache buffer: could not link to death");
return false;
}
auto [itr, success] =
mBuffers.emplace(processToken, std::unordered_map<uint64_t, ClientCacheBuffer>());
LOG_ALWAYS_FATAL_IF(!success, "failed to insert new process into client cache");
it = itr;
}
auto& processBuffers = it->second;
if (processBuffers.size() > BUFFER_CACHE_MAX_SIZE) {
ALOGE("failed to cache buffer: cache is full");
return false;
}
processBuffers[id].buffer = buffer;
return true;
}
void ClientCache::erase(const client_cache_t& cacheId) {
auto& [processToken, id] = cacheId;
std::vector<sp<ErasedRecipient>> pendingErase;
{
std::lock_guard lock(mMutex);
ClientCacheBuffer* buf = nullptr;
if (!getBuffer(cacheId, &buf)) {
ALOGE("failed to erase buffer, could not retrieve buffer");
return;
}
for (auto& recipient : buf->recipients) {
sp<ErasedRecipient> erasedRecipient = recipient.promote();
if (erasedRecipient) {
pendingErase.push_back(erasedRecipient);
}
}
mBuffers[processToken].erase(id);
}
for (auto& recipient : pendingErase) {
recipient->bufferErased(cacheId);
}
}
sp<GraphicBuffer> ClientCache::get(const client_cache_t& cacheId) {
std::lock_guard lock(mMutex);
ClientCacheBuffer* buf = nullptr;
if (!getBuffer(cacheId, &buf)) {
ALOGE("failed to get buffer, could not retrieve buffer");
return nullptr;
}
return buf->buffer;
}
bool ClientCache::registerErasedRecipient(const client_cache_t& cacheId,
const wp<ErasedRecipient>& recipient) {
std::lock_guard lock(mMutex);
ClientCacheBuffer* buf = nullptr;
if (!getBuffer(cacheId, &buf)) {
ALOGE("failed to register erased recipient, could not retrieve buffer");
return false;
}
buf->recipients.insert(recipient);
return true;
}
void ClientCache::unregisterErasedRecipient(const client_cache_t& cacheId,
const wp<ErasedRecipient>& recipient) {
std::lock_guard lock(mMutex);
ClientCacheBuffer* buf = nullptr;
if (!getBuffer(cacheId, &buf)) {
ALOGE("failed to unregister erased recipient");
return;
}
buf->recipients.erase(recipient);
}
void ClientCache::removeProcess(const wp<IBinder>& processToken) {
std::vector<std::pair<sp<ErasedRecipient>, client_cache_t>> pendingErase;
{
if (processToken == nullptr) {
ALOGE("failed to remove process, invalid (nullptr) process token");
return;
}
std::lock_guard lock(mMutex);
auto itr = mBuffers.find(processToken);
if (itr == mBuffers.end()) {
ALOGE("failed to remove process, could not find process");
return;
}
for (auto& [id, clientCacheBuffer] : itr->second) {
client_cache_t cacheId = {processToken, id};
for (auto& recipient : clientCacheBuffer.recipients) {
sp<ErasedRecipient> erasedRecipient = recipient.promote();
if (erasedRecipient) {
pendingErase.emplace_back(erasedRecipient, cacheId);
}
}
}
mBuffers.erase(itr);
}
for (auto& [recipient, cacheId] : pendingErase) {
recipient->bufferErased(cacheId);
}
}
void ClientCache::CacheDeathRecipient::binderDied(const wp<IBinder>& who) {
ClientCache::getInstance().removeProcess(who);
}
}; // namespace android
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