rob05c commented on a change in pull request #1950: Added CRUD for /parameters
URL: 
https://github.com/apache/incubator-trafficcontrol/pull/1950#discussion_r171916989
 
 

 ##########
 File path: traffic_ops/traffic_ops_golang/parameter/parameters.go
 ##########
 @@ -0,0 +1,354 @@
+package parameter
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import (
+       "errors"
+       "fmt"
+       "strconv"
+
+       "github.com/apache/incubator-trafficcontrol/lib/go-log"
+       "github.com/apache/incubator-trafficcontrol/lib/go-tc"
+       
"github.com/apache/incubator-trafficcontrol/traffic_ops/traffic_ops_golang/api"
+       
"github.com/apache/incubator-trafficcontrol/traffic_ops/traffic_ops_golang/auth"
+       
"github.com/apache/incubator-trafficcontrol/traffic_ops/traffic_ops_golang/dbhelpers"
+
+       "github.com/jmoiron/sqlx"
+       "github.com/lib/pq"
+)
+
+//we need a type alias to define functions on
+type TOParameter tc.ParameterNullable
+
+//the refType is passed into the handlers where a copy of its type is used to 
decode the json.
+var refType = TOParameter(tc.ParameterNullable{})
+
+func GetRefType() *TOParameter {
+       return &refType
+}
+
+//Implementation of the Identifier, Validator interface functions
+func (parameter *TOParameter) GetID() (int, bool) {
+       if parameter.ID == nil {
 
 Review comment:
   >these shouldn't be pointer receivers -- only methods that modify the 
content should be
   
   I don't agree. Non-pointers copy the entire object on every call. There's no 
reason to create an expensive copy of this object, just to get the ID.
   
   Reasons for value-functions are 
   * when the object is small, so the safety of being unable to modify the real 
object outweighs the performance cost
   * the function does modify the object for its own use, but it's necessary to 
leave the called object unmodified
   * The object is small enough, and the function called frequently enough, and 
performance matters, that a copy is faster than the cache-locality-breaking 
pointer lookup.
   * It's desirable to avoid fulfilling a pointer interface
   
   None of those apply here.
   
   That said, the object isn't _that_ big, I don't feel super-strongly that it 
needs to be a pointer, if you feel that strongly in the other direction.
   
   But I disagree strongly with the statement "only methods that modify the 
content should be [pointer receivers]". Value member functions in Go create a 
copy of the entire object on every call, and that needs to be considered.

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