Add simple Ticket Master which pro-actively sends messages on proceedChannel

Handlers are going to wait on proceedChannel, this the initial step towards
providing priority for different set of API operations

pkg/server/api/api.go

@@ -0,0 +1,32 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
+ *
+ * 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 api
+
+// Operation container for individual operations read by Ticket Master
+type Operation struct {
+	ProceedCh chan struct{}
+}
+
+// Minio container for API and also carries OP (operation) channel
+type Minio struct {
+	OP chan Operation
+}
+
+// New instantiate a new minio API
+func New() Minio {
+	return Minio{OP: make(chan Operation)}
+}