go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/logdog/common/fetcher/buffer.go (about)

     1  // Copyright 2015 The LUCI Authors.
     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  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fetcher
    16  
    17  import (
    18  	"container/list"
    19  
    20  	"go.chromium.org/luci/logdog/api/logpb"
    21  )
    22  
    23  type logBuffer struct {
    24  	l      list.List
    25  	cur    []*logpb.LogEntry
    26  	curIdx int
    27  
    28  	count int
    29  }
    30  
    31  func (b *logBuffer) current() *logpb.LogEntry {
    32  	for b.curIdx >= len(b.cur) {
    33  		if b.l.Len() == 0 {
    34  			return nil
    35  		}
    36  		b.cur = b.l.Remove(b.l.Front()).([]*logpb.LogEntry)
    37  		b.curIdx = 0
    38  	}
    39  
    40  	return b.cur[b.curIdx]
    41  }
    42  
    43  func (b *logBuffer) next() {
    44  	b.curIdx++
    45  	b.count--
    46  }
    47  
    48  func (b *logBuffer) append(le ...*logpb.LogEntry) {
    49  	b.l.PushBack(le)
    50  	b.count += len(le)
    51  }
    52  
    53  func (b *logBuffer) size() int {
    54  	return b.count
    55  }