5d3fc80067
* Add streaming load feature. You can execute 'help stream load;' to see more information. Changed: * Loading phase of a certain table can be parallelized, to reduce the load job execution time when multi load jobs to a single table. * Using RocksDB to save the header info of tablets in Backends, to reduce the IO operations and increate speeding of restarting. Fixed: * A lot of bugs fixed.
69 lines
1.6 KiB
C++
69 lines
1.6 KiB
C++
// Copyright (c) 2017, Baidu.com, Inc. All Rights Reserved
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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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <string.h>
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#include <cstddef>
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#include <memory>
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#include "common/logging.h"
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namespace palo {
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struct ByteBuffer;
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using ByteBufferPtr = std::shared_ptr<ByteBuffer>;
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struct ByteBuffer {
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static ByteBufferPtr allocate(size_t size) {
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ByteBufferPtr ptr(new ByteBuffer(size));
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return ptr;
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}
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~ByteBuffer() { delete[] ptr; }
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void put_bytes(const char* data, size_t size) {
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memcpy(ptr + pos , data, size);
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pos += size;
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}
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void get_bytes(char* data, size_t size) {
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memcpy(data, ptr + pos, size);
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pos += size;
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DCHECK(pos <= limit);
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}
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void flip() {
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limit = pos;
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pos = 0;
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}
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size_t remaining() const { return limit - pos; }
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bool has_remaining() const { return limit > pos; }
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char* const ptr;
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size_t pos;
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size_t limit;
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size_t capacity;
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private:
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ByteBuffer(size_t capacity_)
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: ptr(new char[capacity_]), pos(0),
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limit(capacity_), capacity(capacity_) {
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}
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};
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}
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