51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
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package stream
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import "runtime"
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// Collector 收集器接口，对于所有的并发流，定义打包行为
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type Collector interface {
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Supplier() func() interface{}
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Accumulator() func(interface{}, interface{}) interface{}
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Combiner() func(interface{}, interface{}) interface{}
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Finisher() func(interface{}) interface{}
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}
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// Collect 收集器，对于所有的并发流，打包
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func (s *Stream) Collect(collector Collector) interface{} {
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identity := collector.Supplier()()
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if s.isParallel {
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count := runtime.NumCPU()
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ch1 := make(chan interface{}, count)
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ch2 := make(chan interface{})
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for i := 0; i < count; i++ {
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go func() {
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result := collector.Supplier()()
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for true {
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if value, ok := <-ch1; !ok {
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break
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} else {
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result = collector.Accumulator()(result, value)
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}
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}
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ch2 <- result
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}()
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}
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go func() {
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for _, v := range s.list {
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ch1 <- v
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}
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close(ch1)
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}()
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for i := 0; i < count; i++ {
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tmp := <-ch2
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identity = collector.Combiner()(identity, tmp)
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}
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} else {
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for _, v := range s.list {
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identity = collector.Accumulator()(identity, v)
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}
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}
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identity = collector.Finisher()(identity)
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return identity
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}
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