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Subscriber.go
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Subscriber.go
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/*
* 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 bacnetip
import (
"context"
"github.com/apache/plc4x/plc4go/spi/options"
"github.com/pkg/errors"
"github.com/rs/zerolog"
apiModel "github.com/apache/plc4x/plc4go/pkg/api/model"
spiModel "github.com/apache/plc4x/plc4go/spi/model"
)
//go:generate go run ../../tools/plc4xgenerator/gen.go -type=Subscriber
type Subscriber struct {
connection *Connection
consumers map[*spiModel.DefaultPlcConsumerRegistration]apiModel.PlcSubscriptionEventConsumer
log zerolog.Logger `ignore:"true"`
_options []options.WithOption // Used to pass them downstream
}
func NewSubscriber(connection *Connection, _options ...options.WithOption) *Subscriber {
logger := options.ExtractCustomLoggerOrDefaultToGlobal(_options...)
return &Subscriber{
connection: connection,
consumers: make(map[*spiModel.DefaultPlcConsumerRegistration]apiModel.PlcSubscriptionEventConsumer),
log: logger,
_options: _options,
}
}
func (m *Subscriber) Subscribe(ctx context.Context, subscriptionRequest apiModel.PlcSubscriptionRequest) <-chan apiModel.PlcSubscriptionRequestResult {
result := make(chan apiModel.PlcSubscriptionRequestResult, 1)
go func() {
internalPlcSubscriptionRequest := subscriptionRequest.(*spiModel.DefaultPlcSubscriptionRequest)
// Add this subscriber to the connection.
m.connection.addSubscriber(m)
// Just populate all requests with an OK
responseCodes := map[string]apiModel.PlcResponseCode{}
subscriptionValues := make(map[string]apiModel.PlcSubscriptionHandle)
for _, tagName := range internalPlcSubscriptionRequest.GetTagNames() {
if err := ctx.Err(); err != nil {
result <- spiModel.NewDefaultPlcSubscriptionRequestResult(subscriptionRequest, nil, err)
return
}
responseCodes[tagName] = apiModel.PlcResponseCode_OK
subscriptionValues[tagName] = spiModel.NewDefaultPlcSubscriptionHandle(m)
}
result <- spiModel.NewDefaultPlcSubscriptionRequestResult(
subscriptionRequest,
spiModel.NewDefaultPlcSubscriptionResponse(
subscriptionRequest,
responseCodes,
subscriptionValues,
append(m._options, options.WithCustomLogger(m.log))...,
),
nil,
)
}()
return result
}
func (m *Subscriber) Unsubscribe(ctx context.Context, unsubscriptionRequest apiModel.PlcUnsubscriptionRequest) <-chan apiModel.PlcUnsubscriptionRequestResult {
// TODO: handle ctx
result := make(chan apiModel.PlcUnsubscriptionRequestResult, 1)
result <- spiModel.NewDefaultPlcUnsubscriptionRequestResult(unsubscriptionRequest, nil, errors.New("not implemented"))
// TODO: As soon as we establish a connection, we start getting data...
// subscriptions are more an internal handling of which values to pass where.
return result
}
func (m *Subscriber) Register(consumer apiModel.PlcSubscriptionEventConsumer, handles []apiModel.PlcSubscriptionHandle) apiModel.PlcConsumerRegistration {
consumerRegistration := spiModel.NewDefaultPlcConsumerRegistration(m, consumer, handles...)
m.consumers[consumerRegistration.(*spiModel.DefaultPlcConsumerRegistration)] = consumer
return consumerRegistration
}
func (m *Subscriber) Unregister(registration apiModel.PlcConsumerRegistration) {
delete(m.consumers, registration.(*spiModel.DefaultPlcConsumerRegistration))
}