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/*
* Copyright (c) 2021 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.
*/
#pragma once
#include <hicn/transport/core/name.h>
#include <hicn/transport/errors/runtime_exception.h>
namespace utils {
/**
* INCREMENTAL: Manifests will be received inline with the data with no specific
* assumption regarding the manifest capacity. Consumers can send interests
* using a +1 heuristic.
*
* MANIFEST_CAPACITY_BASED: manifests with capacity N have a suffix multiple of
* N+1: 0, N+1, 2(N+1) etc. Contents have a suffix incremented by 1 except when
* it conflicts with a manifest: 1, 2, ..., N, N+2, N+3, ..., 2N+1, 2N+3
*/
enum class NextSuffixStrategy : uint8_t {
INCREMENTAL = 1,
};
class SuffixStrategy {
public:
static constexpr uint32_t MAX_SUFFIX = std::numeric_limits<uint32_t>::max();
static constexpr uint8_t MAX_MANIFEST_CAPACITY =
std::numeric_limits<uint8_t>::max();
SuffixStrategy(NextSuffixStrategy strategy, uint32_t offset = 0,
uint32_t manifest_capacity = MAX_MANIFEST_CAPACITY)
: suffix_stragegy_(strategy),
next_suffix_(offset),
manifest_capacity_(manifest_capacity),
total_count_(0),
final_suffix_(MAX_SUFFIX) {}
virtual ~SuffixStrategy() = default;
virtual uint32_t checkNextSuffix() const = 0;
virtual uint32_t getNextSuffix() = 0;
virtual uint32_t checkNextManifestSuffix() const = 0;
virtual uint32_t getNextManifestSuffix() = 0;
virtual uint32_t checkNextContentSuffix() const = 0;
virtual uint32_t getNextContentSuffix() = 0;
virtual void reset(uint32_t offset = 0) {
next_suffix_ = offset;
total_count_ = 0;
}
virtual uint32_t getManifestCapacity() const { return manifest_capacity_; };
virtual void setManifestCapacity(uint8_t capacity) {
manifest_capacity_ = capacity;
}
virtual uint32_t getFinalSuffix() const { return final_suffix_; }
virtual void setFinalSuffix(std::uint32_t final_suffix) {
if (final_suffix != MAX_SUFFIX) {
final_suffix_ = final_suffix;
}
}
NextSuffixStrategy getSuffixStrategy() const { return suffix_stragegy_; }
virtual uint32_t getTotalCount() const { return total_count_; }
protected:
NextSuffixStrategy suffix_stragegy_;
std::uint32_t next_suffix_;
std::uint8_t manifest_capacity_;
std::uint32_t total_count_;
std::uint32_t final_suffix_;
inline void incrementTotalCount() { total_count_++; };
};
class IncrementalSuffixStrategy : public SuffixStrategy {
public:
IncrementalSuffixStrategy(std::uint32_t start_offset)
: SuffixStrategy(NextSuffixStrategy::INCREMENTAL, start_offset) {}
TRANSPORT_ALWAYS_INLINE std::uint32_t checkNextSuffix() const override {
return next_suffix_;
}
TRANSPORT_ALWAYS_INLINE std::uint32_t getNextSuffix() override {
incrementTotalCount();
return next_suffix_++;
}
TRANSPORT_ALWAYS_INLINE std::uint32_t checkNextContentSuffix()
const override {
return checkNextSuffix();
}
TRANSPORT_ALWAYS_INLINE std::uint32_t getNextContentSuffix() override {
return getNextSuffix();
}
TRANSPORT_ALWAYS_INLINE std::uint32_t checkNextManifestSuffix()
const override {
return checkNextSuffix();
}
TRANSPORT_ALWAYS_INLINE std::uint32_t getNextManifestSuffix() override {
return getNextSuffix();
}
void reset(std::uint32_t offset = 0) override { next_suffix_ = offset; }
};
class SuffixStrategyFactory {
public:
static std::unique_ptr<SuffixStrategy> getSuffixStrategy(
NextSuffixStrategy strategy, uint32_t start_offset = 0,
uint32_t manifest_capacity = SuffixStrategy::MAX_MANIFEST_CAPACITY) {
switch (strategy) {
case NextSuffixStrategy::INCREMENTAL:
return std::make_unique<IncrementalSuffixStrategy>(start_offset);
default:
throw errors::RuntimeException(
"No valid NextSuffixStrategy specified.");
}
}
};
} // namespace utils
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