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68 lines
2.4 KiB
Go
68 lines
2.4 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package mqclient
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import (
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"context"
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)
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// ReaderMessage package Reader and Message as a struct to use
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type ReaderMessage struct {
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Reader
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Message
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}
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// ReaderOptions abstraction Reader options to use.
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type ReaderOptions struct {
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// Topic specify the topic this consumer will subscribe on.
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// This argument is required when constructing the reader.
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Topic string
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// Name set the reader name.
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Name string
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// Attach a set of application defined properties to the reader
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// This properties will be visible in the topic stats
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Properties map[string]string
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// StartMessageID initial reader positioning is done by specifying a message id. The options are:
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// * `MessageID` : Start reading from a particular message id, the reader will position itself on that
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// specific position. The first message to be read will be the message next to the specified
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// messageID
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StartMessageID MessageID
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// If true, the reader will start at the `StartMessageID`, included.
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// Default is `false` and the reader will start from the "next" message
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StartMessageIDInclusive bool
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// SubscriptionRolePrefix set the subscription role prefix. The default prefix is "reader".
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SubscriptionRolePrefix string
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}
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// Reader can be used to scan through all the messages currently available in a topic.
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type Reader interface {
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// Topic from which this reader is reading from
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Topic() string
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// Next read the next message in the topic, blocking until a message is available
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Next(context.Context) (Message, error)
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// HasNext check if there is any message available to read from the current position
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HasNext() bool
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// Close the reader and stop the broker to push more messages
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Close()
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// Reset the subscription associated with this reader to a specific message id.
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Seek(MessageID) error
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}
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