mirror of
https://gitee.com/milvus-io/milvus.git
synced 2026-01-07 19:31:51 +08:00
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
|
|
//
|
|
// 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.
|
|
|
|
package client
|
|
|
|
import (
|
|
"context"
|
|
)
|
|
|
|
// reader contains main options for rocksmq, and can only be set when newReader
|
|
type reader struct {
|
|
c *client
|
|
topic string
|
|
name string
|
|
startMessageID UniqueID
|
|
startMessageIDInclusive bool
|
|
subscriptionRolePrefix string
|
|
}
|
|
|
|
// newReader create a rocksmq reader from reader options
|
|
func newReader(c *client, readerOptions *ReaderOptions) (*reader, error) {
|
|
if c == nil {
|
|
return nil, newError(InvalidConfiguration, "client is nil")
|
|
}
|
|
if readerOptions == nil {
|
|
return nil, newError(InvalidConfiguration, "options is nil")
|
|
}
|
|
if readerOptions.Topic == "" {
|
|
return nil, newError(InvalidConfiguration, "topic is empty")
|
|
}
|
|
reader := &reader{
|
|
c: c,
|
|
topic: readerOptions.Topic,
|
|
name: readerOptions.Name,
|
|
startMessageID: readerOptions.StartMessageID,
|
|
startMessageIDInclusive: readerOptions.StartMessageIDInclusive,
|
|
subscriptionRolePrefix: readerOptions.SubscriptionRolePrefix,
|
|
}
|
|
if c.server == nil {
|
|
return nil, newError(InvalidConfiguration, "rmq server in client is nil")
|
|
}
|
|
name, err := c.server.CreateReader(readerOptions.Topic, reader.startMessageID, reader.startMessageIDInclusive, reader.subscriptionRolePrefix)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
reader.name = name
|
|
return reader, nil
|
|
}
|
|
|
|
//Topic return the topic name of the reader
|
|
func (r *reader) Topic() string {
|
|
return r.topic
|
|
}
|
|
|
|
// Next return the next message of reader, blocking until a message is available
|
|
func (r *reader) Next(ctx context.Context) (Message, error) {
|
|
cMsg, err := r.c.server.Next(ctx, r.topic, r.name)
|
|
if err != nil {
|
|
return Message{}, err
|
|
}
|
|
msg := Message{
|
|
MsgID: cMsg.MsgID,
|
|
Payload: cMsg.Payload,
|
|
Topic: r.topic,
|
|
}
|
|
return msg, nil
|
|
}
|
|
|
|
// HasNext check if there is a message available to read
|
|
func (r *reader) HasNext() bool {
|
|
return r.c.server.HasNext(r.topic, r.name)
|
|
}
|
|
|
|
// Close close the reader and stop the blocking reader
|
|
func (r *reader) Close() {
|
|
r.c.server.CloseReader(r.topic, r.name)
|
|
}
|
|
|
|
// Seek seek the reader to the position of message id
|
|
func (r *reader) Seek(msgID UniqueID) error { //nolint:govet
|
|
r.c.server.ReaderSeek(r.topic, r.name, msgID)
|
|
return nil
|
|
}
|