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https://issues.apache.org/jira/browse/BEAM-3612?focusedWorklogId=170767&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-170767
]
ASF GitHub Bot logged work on BEAM-3612:
----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Nov/18 18:49
Start Date: 29/Nov/18 18:49
Worklog Time Spent: 10m
Work Description: wcn3 commented on a change in pull request #7161:
[BEAM-3612] Closurize method invocations
URL: https://github.com/apache/beam/pull/7161#discussion_r237611764
##########
File path: sdks/go/pkg/beam/core/util/reflectx/structs.go
##########
@@ -0,0 +1,73 @@
+// 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.
+
+package reflectx
+
+import (
+ "context"
+ "reflect"
+ "sync"
+
+ "github.com/apache/beam/sdks/go/pkg/beam/log"
+)
+
+var (
+ structFuncs = make(map[string]func(interface{}) map[string]Func)
+ structFuncsMu sync.Mutex
+)
+
+// RegisterStructWrapper takes in the reflect.Type of a structural DoFn, and
+// a wrapping function that will take an instance of that struct type and
+// produce a map of method names to of closured Funcs that call the method
+// on the instance of the struct.
+//
+// The goal is to avoid the implicit reflective method invocation penalty
+// that occurs when passing a method through the reflect package.
+func RegisterStructWrapper(t reflect.Type, wrapper func(interface{})
map[string]Func) {
+ structFuncsMu.Lock()
+ defer structFuncsMu.Unlock()
+
+ if t.Kind() != reflect.Struct {
+ log.Fatalf(context.Background(), "RegisterStructWrapper for %v
should be a struct type, but was %v", t, t.Kind())
Review comment:
Is this the extent of validity checking that can be performed on the struct?
No required members?
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Issue Time Tracking
-------------------
Worklog Id: (was: 170767)
> Make it easy to generate type-specialized Go SDK reflectx.Funcs
> ---------------------------------------------------------------
>
> Key: BEAM-3612
> URL: https://issues.apache.org/jira/browse/BEAM-3612
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Henning Rohde
> Assignee: Robert Burke
> Priority: Major
> Time Spent: 7.5h
> Remaining Estimate: 0h
>
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