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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* 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.
*/
#include <hicn/transport/core/content_object.h>
#include <hicn/transport/core/interest.h>
#include <hicn/transport/core/name.h>
#include <hicn/transport/utils/content_store.h>
namespace utils {
ContentStore::ContentStore(std::size_t max_packets)
: max_content_store_size_(max_packets) {}
ContentStore::~ContentStore() {}
void ContentStore::insert(
const std::shared_ptr<ContentObject> &content_object) {
if (max_content_store_size_ == 0) {
return;
}
utils::SpinLock::Acquire locked(cs_mutex_);
if (TRANSPORT_EXPECT_FALSE(content_store_hash_table_.size() !=
fifo_list_.size())) {
TRANSPORT_LOGW("Inconsistent size!!!!");
TRANSPORT_LOGW("Hash Table: %zu |||| FIFO List: %zu",
content_store_hash_table_.size(), fifo_list_.size());
}
// Check if the content can be cached
if (content_object->getLifetime() > 0) {
if (content_store_hash_table_.size() >= max_content_store_size_) {
content_store_hash_table_.erase(fifo_list_.back());
fifo_list_.pop_back();
}
// Insert new item
auto it = content_store_hash_table_.find(content_object->getName());
if (it != content_store_hash_table_.end()) {
fifo_list_.erase(it->second.second);
content_store_hash_table_.erase(content_object->getName());
}
fifo_list_.push_front(std::cref(content_object->getName()));
auto pos = fifo_list_.begin();
content_store_hash_table_[content_object->getName()] = ContentStoreEntry(
ObjectTimeEntry(content_object, std::chrono::steady_clock::now()), pos);
}
}
const std::shared_ptr<ContentObject> ContentStore::find(
const Interest &interest) {
utils::SpinLock::Acquire locked(cs_mutex_);
auto it = content_store_hash_table_.find(interest.getName());
if (it != content_store_hash_table_.end()) {
if (std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now() - it->second.first.second)
.count() < it->second.first.first->getLifetime()) {
return it->second.first.first;
}
}
return empty_reference_;
}
void ContentStore::erase(const Name &exact_name) {
utils::SpinLock::Acquire locked(cs_mutex_);
auto it = content_store_hash_table_.find(exact_name);
fifo_list_.erase(it->second.second);
content_store_hash_table_.erase(exact_name);
}
void ContentStore::setLimit(size_t max_packets) {
utils::SpinLock::Acquire locked(cs_mutex_);
max_content_store_size_ = max_packets;
}
std::size_t ContentStore::getLimit() const {
utils::SpinLock::Acquire locked(cs_mutex_);
return max_content_store_size_;
}
std::size_t ContentStore::size() const {
utils::SpinLock::Acquire locked(cs_mutex_);
return content_store_hash_table_.size();
}
void ContentStore::printContent() {
for (auto &item : content_store_hash_table_) {
if (item.second.first.first->getPayloadType() ==
transport::core::PayloadType::MANIFEST) {
TRANSPORT_LOGI("Manifest: %s\n",
item.second.first.first->getName().toString().c_str());
}
}
}
} // end namespace utils
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