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consumer.go
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consumer.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
// Package consumer contains an example implementation of an event consumer
package consumer
import (
"fmt"
"log"
"github.com/cs3org/reva/v2/pkg/events"
)
// Example consumes events from the queue
func Example(c events.Consumer) {
// Step 1 - which group does the consumer belong to?
// each group will get each event that is emitted, but only one member of the group will get it.
group := "test-consumer"
// Step 2 - which events does the consumer listen too?
evs := []events.Unmarshaller{
events.ShareCreated{},
events.ShareUpdated{},
events.ShareRemoved{},
events.ReceivedShareUpdated{},
events.LinkCreated{},
events.LinkUpdated{},
events.LinkRemoved{},
events.LinkAccessed{},
events.LinkAccessFailed{},
}
// Step 3 - create event channel
evChan, err := events.Consume(c, group, evs...)
if err != nil {
log.Fatal(err)
}
// Step 4 - listen to events
for {
event := <-evChan
// best to use type switch to differentiate events
switch v := event.(type) {
case events.ShareCreated:
fmt.Printf("%s) Share created: %+v\n", group, v)
default:
fmt.Printf("%s) %T: %+v\n", group, v, v)
}
}
}