github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/container/queue/chunk.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package queue
    15  
    16  type chunk[T any] struct {
    17  	// [l, r) is a left open right closed interval,
    18  	// that indicates invalid elements within the chunk
    19  	l    int
    20  	r    int
    21  	data []T
    22  
    23  	prev *chunk[T]
    24  	next *chunk[T]
    25  
    26  	// a pointer points to the queue
    27  	queue *ChunkQueue[T]
    28  }
    29  
    30  func (c *chunk[T]) empty() bool {
    31  	return c.l >= c.r
    32  }
    33  
    34  func (c *chunk[T]) len() int {
    35  	return c.r - c.l
    36  }
    37  
    38  func (c *chunk[T]) reset() {
    39  	c.l, c.r = 0, 0
    40  	c.prev, c.next, c.queue = nil, nil, nil
    41  }
    42  
    43  func newChunk[T any](size int, q *ChunkQueue[T]) *chunk[T] {
    44  	return &chunk[T]{
    45  		data:  make([]T, size),
    46  		queue: q,
    47  	}
    48  }