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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#ifndef CVMFS_INGESTION_TASK_READ_H_ |
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#define CVMFS_INGESTION_TASK_READ_H_ |
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#include <stdint.h> |
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#include <atomic> |
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#include "ingestion/item.h" |
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#include "ingestion/task.h" |
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#include "util/posix.h" |
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#include "util/tube.h" |
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class ItemAllocator; |
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class TaskRead : public TubeConsumer<FileItem> { |
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public: |
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static const unsigned kThrottleInitMs = 50; |
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static const unsigned kThrottleMaxMs = 500; |
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static const unsigned kThrottleResetMs = 2000; |
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static const unsigned kBlockSize = kPageSize * 4; |
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TaskRead(Tube<FileItem> *tube_in, |
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TubeGroup<BlockItem> *tubes_out, |
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ItemAllocator *allocator) |
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: TubeConsumer<FileItem>(tube_in) |
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, tubes_out_(tubes_out) |
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, allocator_(allocator) |
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, low_watermark_(0) |
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, high_watermark_(0) { |
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n_block_.store(0); |
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} |
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void SetWatermarks(uint64_t low, uint64_t high); |
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uint64_t n_block() { return n_block_.load(); } |
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protected: |
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virtual void Process(FileItem *item); |
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private: |
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/** |
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* Every new file increases the tag sequence counter that is used to annotate |
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* BlockItems. |
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*/ |
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static std::atomic<int64_t> tag_seq_; |
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TubeGroup<BlockItem> *tubes_out_; |
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ItemAllocator *allocator_; |
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/** |
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* Continue reading once the amount of BlockItem managed bytes is back to |
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* the given level. |
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*/ |
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uint64_t low_watermark_; |
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/** |
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* Stop reading new data into the pipeline when the amount BlockItem managed |
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* byte is higher than the given level. |
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*/ |
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uint64_t high_watermark_; |
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/** |
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* Number of times reading was blocked on a high watermark. |
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*/ |
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std::atomic<int64_t> n_block_; |
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}; |
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#endif // CVMFS_INGESTION_TASK_READ_H_ |
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