forked from GiteaTest2015/streamsql
rulego-team
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
/*
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* Copyright 2025 The RuleGo Authors.
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*
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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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package stream
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import (
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"sync/atomic"
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"time"
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"github.com/rulego/streamsql/logger"
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)
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// DataHandler handles data processing for different strategies
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type DataHandler struct {
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stream *Stream
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}
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// NewDataHandler creates a new data handler
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func NewDataHandler(stream *Stream) *DataHandler {
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return &DataHandler{stream: stream}
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}
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// safeGetDataChan safely gets dataChan reference
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func (s *Stream) safeGetDataChan() chan map[string]interface{} {
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s.dataChanMux.RLock()
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defer s.dataChanMux.RUnlock()
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return s.dataChan
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}
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// safeSendToDataChan safely sends data to dataChan
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func (s *Stream) safeSendToDataChan(data map[string]interface{}) bool {
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dataChan := s.safeGetDataChan()
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select {
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case dataChan <- data:
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return true
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default:
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return false
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}
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}
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// expandDataChannel dynamically expands data channel capacity
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func (s *Stream) expandDataChannel() {
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// Use atomic operation to check if expansion is in progress, prevent concurrent expansion
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if !atomic.CompareAndSwapInt32(&s.expanding, 0, 1) {
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logger.Debug("Channel expansion already in progress, skipping")
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return
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}
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defer atomic.StoreInt32(&s.expanding, 0)
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// Acquire expansion lock to ensure only one goroutine performs expansion
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s.expansionMux.Lock()
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defer s.expansionMux.Unlock()
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// Double-check if expansion is needed (double-checked locking pattern)
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s.dataChanMux.RLock()
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oldCap := cap(s.dataChan)
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currentLen := len(s.dataChan)
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s.dataChanMux.RUnlock()
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// No expansion needed if current channel usage is below 80%
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if float64(currentLen)/float64(oldCap) < 0.8 {
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logger.Debug("Channel usage below threshold, expansion not needed")
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return
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}
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newCap := int(float64(oldCap) * 1.5) // Expand by 50%
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if newCap < oldCap+1000 {
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newCap = oldCap + 1000 // At least increase by 1000
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}
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logger.Debug("Dynamic expansion of data channel: %d -> %d", oldCap, newCap)
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// Create new larger channel
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newChan := make(chan map[string]interface{}, newCap)
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// Safely migrate data using write lock
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s.dataChanMux.Lock()
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oldChan := s.dataChan
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// Quickly migrate data from old channel to new channel
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migrationTimeout := time.NewTimer(5 * time.Second) // 5 second migration timeout
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defer migrationTimeout.Stop()
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migratedCount := 0
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for {
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select {
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case data := <-oldChan:
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select {
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case newChan <- data:
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migratedCount++
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case <-migrationTimeout.C:
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logger.Warn("Data migration timeout, some data may be lost during expansion")
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goto migration_done
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}
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case <-migrationTimeout.C:
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logger.Warn("Data migration timeout during channel drain")
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goto migration_done
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default:
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// Old channel is empty, migration completed
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goto migration_done
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}
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}
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migration_done:
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// Atomically update channel reference
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s.dataChan = newChan
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s.dataChanMux.Unlock()
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logger.Debug("Channel expansion completed: migrated %d items", migratedCount)
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}
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