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mutable_file_service.go
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mutable_file_service.go
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// Copyright 2022 Matrix Origin
//
// 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 fileservice
import "context"
// MutableFileService is an extension interface to FileService that allow mutation
type MutableFileService interface {
FileService
// NewMutator creates a new mutator
NewMutator(ctx context.Context, filePath string) (Mutator, error)
}
type Mutator interface {
// Mutate mutates file contents
Mutate(ctx context.Context, entries ...IOEntry) error
// Append appends data to file
// all IOEntry.Offset is base on the end of file position
// for example, passing IOEntry{Offset: 0, Len:1, Data: []byte("a")} will append "a" to the end of file
Append(ctx context.Context, entries ...IOEntry) error
// Close closes the mutator
// Must be called after finishing mutation
Close() error
}