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108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rmq
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import (
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"sync"
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"sync/atomic"
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"github.com/milvus-io/milvus/internal/mq/mqimpl/rocksmq/client"
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"github.com/milvus-io/milvus/internal/mq/mqimpl/rocksmq/server"
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"github.com/milvus-io/milvus/pkg/mq/msgstream/mqwrapper"
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)
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// Consumer is a client that used to consume messages from rocksmq
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type Consumer struct {
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c client.Consumer
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msgChannel chan mqwrapper.Message
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closeCh chan struct{}
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once sync.Once
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skip int32
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wg sync.WaitGroup
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}
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// Subscription returns the subscription name of this consumer
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func (rc *Consumer) Subscription() string {
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return rc.c.Subscription()
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}
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// Chan returns a channel to read messages from rocksmq
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func (rc *Consumer) Chan() <-chan mqwrapper.Message {
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if rc.msgChannel == nil {
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rc.once.Do(func() {
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rc.msgChannel = make(chan mqwrapper.Message, 256)
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rc.wg.Add(1)
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go func() {
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defer rc.wg.Done()
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for { //nolint:gosimple
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select {
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case msg, ok := <-rc.c.Chan():
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if !ok {
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close(rc.msgChannel)
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return
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}
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skip := atomic.LoadInt32(&rc.skip)
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if skip != 1 {
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select {
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case rc.msgChannel <- msg:
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case <-rc.closeCh:
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// if consumer closed, enter close branch below
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}
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} else {
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atomic.StoreInt32(&rc.skip, 0)
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}
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case <-rc.closeCh:
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close(rc.msgChannel)
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rc.c.Close()
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return
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}
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}
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}()
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})
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}
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return rc.msgChannel
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}
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// Seek is used to seek the position in rocksmq topic
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func (rc *Consumer) Seek(id mqwrapper.MessageID, inclusive bool) error {
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msgID := id.(*server.RmqID).MessageID
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// skip the first message when consume
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if !inclusive {
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atomic.StoreInt32(&rc.skip, 1)
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}
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return rc.c.Seek(msgID)
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}
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// Ack is used to ask a rocksmq message
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func (rc *Consumer) Ack(message mqwrapper.Message) {
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}
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// Close is used to free the resources of this consumer
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func (rc *Consumer) Close() {
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close(rc.closeCh)
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rc.wg.Wait()
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}
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func (rc *Consumer) GetLatestMsgID() (mqwrapper.MessageID, error) {
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msgID, err := rc.c.GetLatestMsgID()
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return &server.RmqID{MessageID: msgID}, err
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}
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func (rc *Consumer) CheckTopicValid(topic string) error {
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return rc.c.CheckTopicValid(topic)
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}
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