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pack.go
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pack.go
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/*
* Copyright 2020 The Yorkie Authors. 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 change
import (
"github.com/yorkie-team/yorkie/pkg/document/key"
"github.com/yorkie-team/yorkie/pkg/document/time"
)
// Pack is a unit for delivering changes in a document to the remote.
type Pack struct {
// DocumentKey is key of the document.
DocumentKey key.Key
// Checkpoint is used to determine the client received changes.
Checkpoint Checkpoint
// Change represents a unit of modification in the document.
Changes []*Change
// Snapshot is a byte array that encode the document.
Snapshot []byte
// MinSyncedTicket is the minimum logical time taken by clients who attach the document.
// It used to collect garbage on the replica on the client.
MinSyncedTicket *time.Ticket
// IsRemoved is a flag that indicates whether the document is removed.
IsRemoved bool
}
// NewPack creates a new instance of Pack.
func NewPack(
key key.Key,
cp Checkpoint,
changes []*Change,
snapshot []byte,
) *Pack {
return &Pack{
DocumentKey: key,
Checkpoint: cp,
Changes: changes,
Snapshot: snapshot,
}
}
// HasChanges returns the whether pack has changes or not.
func (p *Pack) HasChanges() bool {
return len(p.Changes) > 0
}
// ChangesLen returns the size of the changes.
func (p *Pack) ChangesLen() int {
return len(p.Changes)
}
// OperationsLen returns the size of the operations.
func (p *Pack) OperationsLen() int {
operations := 0
for _, c := range p.Changes {
operations += len(c.operations)
}
return operations
}