Add new pools package, to aggregate common sync.Pool types.

Change-Id: I69a21844f38ca3452497726d4786bd144d0218f0

pkg/pools/pools.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2014 The Camlistore Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package pools
+
+import (
+	"bytes"
+	"sync"
+)
+
+// bytesBuffer is a pool of *bytes.Buffer.
+// Callers must Reset the buffer after obtaining it.
+var bytesBuffer = sync.Pool{
+	New: func() interface{} { return new(bytes.Buffer) },
+}
+
+// BytesBuffer returns an empty bytes.Buffer.
+// It should be returned with PutBuffer.
+func BytesBuffer() *bytes.Buffer {
+	buf := bytesBuffer.Get().(*bytes.Buffer)
+	buf.Reset()
+	return buf
+}
+
+// PutBuffer returns a bytes.Buffer previously obtained with BytesBuffer.
+func PutBuffer(buf *bytes.Buffer) {
+	bytesBuffer.Put(buf)
+}