Vendor main dependencies.

vendor/github.com/eapache/channels/batching_channel.go

@@ -0,0 +1,87 @@
+package channels
+
+// BatchingChannel implements the Channel interface, with the change that instead of producing individual elements
+// on Out(), it batches together the entire internal buffer each time. Trying to construct an unbuffered batching channel
+// will panic, that configuration is not supported (and provides no benefit over an unbuffered NativeChannel).
+type BatchingChannel struct {
+	input, output chan interface{}
+	length        chan int
+	buffer        []interface{}
+	size          BufferCap
+}
+
+func NewBatchingChannel(size BufferCap) *BatchingChannel {
+	if size == None {
+		panic("channels: BatchingChannel does not support unbuffered behaviour")
+	}
+	if size < 0 && size != Infinity {
+		panic("channels: invalid negative size in NewBatchingChannel")
+	}
+	ch := &BatchingChannel{
+		input:  make(chan interface{}),
+		output: make(chan interface{}),
+		length: make(chan int),
+		size:   size,
+	}
+	go ch.batchingBuffer()
+	return ch
+}
+
+func (ch *BatchingChannel) In() chan<- interface{} {
+	return ch.input
+}
+
+// Out returns a <-chan interface{} in order that BatchingChannel conforms to the standard Channel interface provided
+// by this package, however each output value is guaranteed to be of type []interface{} - a slice collecting the most
+// recent batch of values sent on the In channel. The slice is guaranteed to not be empty or nil. In practice the net
+// result is that you need an additional type assertion to access the underlying values.
+func (ch *BatchingChannel) Out() <-chan interface{} {
+	return ch.output
+}
+
+func (ch *BatchingChannel) Len() int {
+	return <-ch.length
+}
+
+func (ch *BatchingChannel) Cap() BufferCap {
+	return ch.size
+}
+
+func (ch *BatchingChannel) Close() {
+	close(ch.input)
+}
+
+func (ch *BatchingChannel) batchingBuffer() {
+	var input, output, nextInput chan interface{}
+	nextInput = ch.input
+	input = nextInput
+
+	for input != nil || output != nil {
+		select {
+		case elem, open := <-input:
+			if open {
+				ch.buffer = append(ch.buffer, elem)
+			} else {
+				input = nil
+				nextInput = nil
+			}
+		case output <- ch.buffer:
+			ch.buffer = nil
+		case ch.length <- len(ch.buffer):
+		}
+
+		if len(ch.buffer) == 0 {
+			input = nextInput
+			output = nil
+		} else if ch.size != Infinity && len(ch.buffer) >= int(ch.size) {
+			input = nil
+			output = ch.output
+		} else {
+			input = nextInput
+			output = ch.output
+		}
+	}
+
+	close(ch.output)
+	close(ch.length)
+}