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// Copyright (C) MongoDB, Inc. 2022-present.
//
// 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
package mongo
import (
"context"
"time"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
)
// batchCursor is the interface implemented by types that can provide batches of document results.
// The Cursor type is built on top of this type.
type batchCursor interface {
// ID returns the ID of the cursor.
ID() int64
// Next returns true if there is a batch available.
Next(context.Context) bool
// Batch will return a DocumentSequence for the current batch of documents. The returned
// DocumentSequence is only valid until the next call to Next or Close.
Batch() *bsoncore.DocumentSequence
// Server returns a pointer to the cursor's server.
Server() driver.Server
// Err returns the last error encountered.
Err() error
// Close closes the cursor.
Close(context.Context) error
// SetBatchSize is a modifier function used to adjust the batch size of
// the cursor that implements it.
SetBatchSize(int32)
// SetMaxTime will set the maximum amount of time the server will allow
// the operations to execute. The server will error if this field is set
// but the cursor is not configured with awaitData=true.
//
// The time.Duration value passed by this setter will be converted and
// rounded down to the nearest millisecond.
SetMaxTime(time.Duration)
// SetComment will set a user-configurable comment that can be used to
// identify the operation in server logs.
SetComment(interface{})
}
// changeStreamCursor is the interface implemented by batch cursors that also provide the functionality for retrieving
// a postBatchResumeToken from commands and allows for the cursor to be killed rather than closed
type changeStreamCursor interface {
batchCursor
// PostBatchResumeToken returns the latest seen post batch resume token.
PostBatchResumeToken() bsoncore.Document
// KillCursor kills cursor on server without closing batch cursor
KillCursor(context.Context) error
}