Added the ability to monitor job updates.

Added the ability to kill and restart specific instances.
Fixed incorrect documentation on using-the-sample-client.
Added helper functions under the response package to extract fields from
aurora.Response.

monitors.go

@@ -0,0 +1,61 @@
+/**
+ * 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.
+ */
+
+// Collection of monitors to create synchronicity
+package realis
+
+import (
+	"gen-go/apache/aurora"
+	"fmt"
+	"os"
+	"github.com/rdelval/gorealis/response"
+	"time"
+)
+
+// Polls the scheduler every certain amount of time to see if the update has succeeded
+func (r realisClient) MonitorJobUpdate(updateKey aurora.JobUpdateKey, interval int, timeout int) bool {
+
+	for i:= 0; i*interval <= timeout; i++ {
+		respDetail, err := r.JobUpdateDetails(updateKey)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		updateDetail := response.JobUpdateDetails(respDetail)
+
+		// Iterate through the history of the events available
+		for _, detail := range updateDetail.UpdateEvents {
+			if _, ok := aurora.ACTIVE_JOB_UPDATE_STATES[detail.Status]; !ok {
+
+				// Rolled forward is the only state in which an update has been successfully updated
+				// if we encounter an inactive state and it is not at rolled forward, update failed
+				if detail.Status == aurora.JobUpdateStatus_ROLLED_FORWARD {
+					fmt.Println("Update succeded")
+					return true
+				} else {
+					fmt.Println("Update failed")
+					return false
+				}
+			}
+		}
+
+		fmt.Println("Polling, update still active...")
+		time.Sleep(time.Duration(interval) * time.Second)
+	}
+
+
+	fmt.Println("Timed out")
+	return false
+}