add vendoring with go dep

vendor/github.com/influxdata/influxdb/pkg/pool/generic.go

@@ -0,0 +1,40 @@
+package pool
+
+// Generic is a pool of types that can be re-used.  Items in
+// this pool will not be garbage collected when not in use.
+type Generic struct {
+	pool chan interface{}
+	fn   func(sz int) interface{}
+}
+
+// NewGeneric returns a Generic pool with capacity for max items
+// to be pool.
+func NewGeneric(max int, fn func(sz int) interface{}) *Generic {
+	return &Generic{
+		pool: make(chan interface{}, max),
+		fn:   fn,
+	}
+}
+
+// Get returns a item from the pool or a new instance if the pool
+// is empty.  Items returned may not be in the zero state and should
+// be reset by the caller.
+func (p *Generic) Get(sz int) interface{} {
+	var c interface{}
+	select {
+	case c = <-p.pool:
+	default:
+		c = p.fn(sz)
+	}
+
+	return c
+}
+
+// Put returns an item back to the pool.  If the pool is full, the item
+// is discarded.
+func (p *Generic) Put(c interface{}) {
+	select {
+	case p.pool <- c:
+	default:
+	}
+}