-
Notifications
You must be signed in to change notification settings - Fork 388
/
DefaultPlcReadRequest.go
172 lines (150 loc) · 6.16 KB
/
DefaultPlcReadRequest.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
* 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
*
* https://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 model
import (
"context"
"runtime/debug"
"time"
apiModel "github.com/apache/plc4x/plc4go/pkg/api/model"
"github.com/apache/plc4x/plc4go/spi"
"github.com/apache/plc4x/plc4go/spi/interceptors"
"github.com/pkg/errors"
)
var _ apiModel.PlcReadRequestBuilder = &DefaultPlcReadRequestBuilder{}
//go:generate go run ../../tools/plc4xgenerator/gen.go -type=DefaultPlcReadRequestBuilder
type DefaultPlcReadRequestBuilder struct {
reader spi.PlcReader `ignore:"true"`
tagHandler spi.PlcTagHandler `ignore:"true"`
tagNames []string
tagAddresses map[string]string
tags map[string]apiModel.PlcTag
readRequestInterceptor interceptors.ReadRequestInterceptor `ignore:"true"`
}
func NewDefaultPlcReadRequestBuilder(tagHandler spi.PlcTagHandler, reader spi.PlcReader) apiModel.PlcReadRequestBuilder {
return NewDefaultPlcReadRequestBuilderWithInterceptor(tagHandler, reader, nil)
}
func NewDefaultPlcReadRequestBuilderWithInterceptor(tagHandler spi.PlcTagHandler, reader spi.PlcReader, readRequestInterceptor interceptors.ReadRequestInterceptor) apiModel.PlcReadRequestBuilder {
return &DefaultPlcReadRequestBuilder{
reader: reader,
tagHandler: tagHandler,
tagNames: make([]string, 0),
tagAddresses: map[string]string{},
tags: map[string]apiModel.PlcTag{},
readRequestInterceptor: readRequestInterceptor,
}
}
func (d *DefaultPlcReadRequestBuilder) AddTagAddress(name string, query string) apiModel.PlcReadRequestBuilder {
d.tagNames = append(d.tagNames, name)
d.tagAddresses[name] = query
return d
}
func (d *DefaultPlcReadRequestBuilder) AddTag(name string, tag apiModel.PlcTag) apiModel.PlcReadRequestBuilder {
d.tagNames = append(d.tagNames, name)
d.tags[name] = tag
return d
}
func (d *DefaultPlcReadRequestBuilder) Build() (apiModel.PlcReadRequest, error) {
for _, name := range d.tagNames {
if tagAddress, ok := d.tagAddresses[name]; ok {
tag, err := d.tagHandler.ParseTag(tagAddress)
if err != nil {
return nil, errors.Wrapf(err, "Error parsing tag query: %s", tagAddress)
}
d.tags[name] = tag
}
}
// Reset the queries
d.tagAddresses = map[string]string{}
return NewDefaultPlcReadRequest(d.tags, d.tagNames, d.reader, d.readRequestInterceptor), nil
}
var _ apiModel.PlcReadRequest = &DefaultPlcReadRequest{}
//go:generate go run ../../tools/plc4xgenerator/gen.go -type=DefaultPlcReadRequest
type DefaultPlcReadRequest struct {
*DefaultPlcTagRequest
reader spi.PlcReader `ignore:"true"`
readRequestInterceptor interceptors.ReadRequestInterceptor `ignore:"true"`
}
func NewDefaultPlcReadRequest(
tags map[string]apiModel.PlcTag,
tagNames []string,
reader spi.PlcReader,
readRequestInterceptor interceptors.ReadRequestInterceptor,
) apiModel.PlcReadRequest {
return &DefaultPlcReadRequest{
DefaultPlcTagRequest: NewDefaultPlcTagRequest(tags, tagNames),
reader: reader,
readRequestInterceptor: readRequestInterceptor,
}
}
func (d *DefaultPlcReadRequest) GetReader() spi.PlcReader {
return d.reader
}
func (d *DefaultPlcReadRequest) GetReadRequestInterceptor() interceptors.ReadRequestInterceptor {
return d.readRequestInterceptor
}
func (d *DefaultPlcReadRequest) Execute() <-chan apiModel.PlcReadRequestResult {
return d.ExecuteWithContext(context.TODO())
}
func (d *DefaultPlcReadRequest) ExecuteWithContext(ctx context.Context) <-chan apiModel.PlcReadRequestResult {
if d.readRequestInterceptor != nil {
return d.ExecuteWithContextAndInterceptor(ctx)
}
return d.reader.Read(ctx, d)
}
func (d *DefaultPlcReadRequest) ExecuteWithContextAndInterceptor(ctx context.Context) <-chan apiModel.PlcReadRequestResult {
// Split the requests up into multiple ones.
readRequests := d.readRequestInterceptor.InterceptReadRequest(ctx, d)
// Shortcut for single-request-requests
if len(readRequests) == 1 {
return d.reader.Read(ctx, readRequests[0])
}
// Create a sub-result-channel slice
var subResultChannels []<-chan apiModel.PlcReadRequestResult
// Iterate over all requests and add the result-channels to the list
for _, subRequest := range readRequests {
subResultChannels = append(subResultChannels, d.reader.Read(ctx, subRequest))
// TODO: Replace this with a real queueing of requests. Later on we need throttling. At the moment this avoids race condition as the read above writes to fast on the line which is a problem for the test
time.Sleep(4 * time.Millisecond)
}
// Create a new result-channel, which completes as soon as all sub-result-channels have returned
resultChannel := make(chan apiModel.PlcReadRequestResult, 1)
go func() {
defer func() {
if err := recover(); err != nil {
resultChannel <- NewDefaultPlcReadRequestResult(d, nil, errors.Errorf("panic-ed %v. Stack: %s", err, debug.Stack()))
}
}()
var subResults []apiModel.PlcReadRequestResult
// Iterate over all sub-results
for _, subResultChannel := range subResultChannels {
select {
case <-ctx.Done():
resultChannel <- NewDefaultPlcReadRequestResult(d, nil, ctx.Err())
return
case subResult := <-subResultChannel:
subResults = append(subResults, subResult)
}
}
// As soon as all are done, process the results
result := d.readRequestInterceptor.ProcessReadResponses(ctx, d, subResults)
// Return the final result
resultChannel <- result
}()
return resultChannel
}