refactored for easier mainenance, add Alloc and Metrics classes

cmd/alloc.go

@@ -0,0 +1,27 @@
+package cmd
+
+import "github.com/ncw/directio"
+
+// aligned allocs used for testing
+type Alloc struct {
+	writeBlock []byte
+	readBlock  []byte
+}
+
+// zero the memory blocks
+func (alloc *Alloc) Clean() {
+	for i := range alloc.writeBlock {
+		alloc.writeBlock[i] = 0
+	}
+
+	for i := range alloc.readBlock {
+		alloc.readBlock[i] = 0
+	}
+}
+
+func NewAlloc() *Alloc {
+	return &Alloc{
+		writeBlock: directio.AlignedBlock(directio.BlockSize),
+		readBlock:  directio.AlignedBlock(directio.BlockSize),
+	}
+}