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85 lines
2.1 KiB
85 lines
2.1 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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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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#pragma once
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#include <memory>
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#include <vector>
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#include "paddle/fluid/framework/ddim.h"
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#include "paddle/fluid/framework/lod_tensor_array.h"
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#include "paddle/fluid/platform/place.h"
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namespace paddle {
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namespace framework {
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class ReaderBase {
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public:
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virtual void ReadNext(std::vector<LoDTensor>* out) = 0;
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virtual void ReInit() = 0;
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virtual ~ReaderBase();
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};
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class DecoratedReader : public ReaderBase {
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public:
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explicit DecoratedReader(const std::shared_ptr<ReaderBase>& reader)
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: ReaderBase(), reader_(reader) {
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PADDLE_ENFORCE_NOT_NULL(reader_);
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}
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void ReInit() override { reader_->ReInit(); }
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protected:
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std::shared_ptr<ReaderBase> reader_;
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};
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class FileReader : public ReaderBase {
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public:
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explicit FileReader(const std::vector<DDim>& dims);
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void ReadNext(std::vector<LoDTensor>* out) override;
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protected:
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virtual void ReadNextImpl(std::vector<LoDTensor>* out) = 0;
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private:
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std::vector<DDim> dims_;
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};
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// The ReaderHolder is used as reader' unified wrapper,
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// making it easier to access different type reader in Variables.
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class ReaderHolder {
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public:
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void Reset(ReaderBase* reader) { reader_.reset(reader); }
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std::shared_ptr<ReaderBase> Get() const { return reader_; }
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void ReadNext(std::vector<LoDTensor>* out) {
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PADDLE_ENFORCE_NOT_NULL(reader_);
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reader_->ReadNext(out);
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}
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void ReInit() {
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PADDLE_ENFORCE_NOT_NULL(reader_);
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reader_->ReInit();
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}
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private:
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std::shared_ptr<ReaderBase> reader_;
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};
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} // namespace framework
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} // namespace paddle
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