github.com/mook-as/cf-cli@v7.0.0-beta.28.0.20200120190804-b91c115fae48+incompatible/cf/api/logs/noaa_message_queue.go (about)

     1  package logs
     2  
     3  import (
     4  	"sort"
     5  	"sync"
     6  
     7  	"github.com/cloudfoundry/sonde-go/events"
     8  )
     9  
    10  type NoaaMessageQueue struct {
    11  	messages []*events.LogMessage
    12  	mutex    sync.Mutex
    13  }
    14  
    15  func NewNoaaMessageQueue() *NoaaMessageQueue {
    16  	return &NoaaMessageQueue{}
    17  }
    18  
    19  func (pq *NoaaMessageQueue) PushMessage(message *events.LogMessage) {
    20  	pq.mutex.Lock()
    21  	defer pq.mutex.Unlock()
    22  
    23  	pq.messages = append(pq.messages, message)
    24  }
    25  
    26  // implement sort interface so we can sort messages as we receive them in PushMessage
    27  func (pq *NoaaMessageQueue) Less(i, j int) bool {
    28  	return *pq.messages[i].Timestamp < *pq.messages[j].Timestamp
    29  }
    30  
    31  func (pq *NoaaMessageQueue) Swap(i, j int) {
    32  	pq.messages[i], pq.messages[j] = pq.messages[j], pq.messages[i]
    33  }
    34  
    35  func (pq *NoaaMessageQueue) Len() int {
    36  	return len(pq.messages)
    37  }
    38  
    39  func (pq *NoaaMessageQueue) EnumerateAndClear(onMessage func(*events.LogMessage)) {
    40  	pq.mutex.Lock()
    41  	defer pq.mutex.Unlock()
    42  
    43  	sort.Stable(pq)
    44  
    45  	for _, x := range pq.messages {
    46  		onMessage(x)
    47  	}
    48  
    49  	pq.messages = []*events.LogMessage{}
    50  }