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operation.go
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operation.go
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// Copyright 2013-2019 Aerospike, Inc.
//
// 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 aerospike
type operation interface {
write(cmd BufferEx) (int, error)
}
// OperationType determines operation type
type OperationType *struct{ op byte }
type operationSubType *int
// Valid OperationType values that can be used to create custom Operations.
// The names are self-explanatory.
var (
_READ OperationType = &struct{ op byte }{1}
// READ_HEADER *OperationType = &struct{op: 1 }
_WRITE OperationType = &struct{ op byte }{2}
_CDT_READ OperationType = &struct{ op byte }{3}
_CDT_MODIFY OperationType = &struct{ op byte }{4}
_MAP_READ OperationType = &struct{ op byte }{3}
_MAP_MODIFY OperationType = &struct{ op byte }{4}
_ADD OperationType = &struct{ op byte }{5}
_APPEND OperationType = &struct{ op byte }{9}
_PREPEND OperationType = &struct{ op byte }{10}
_TOUCH OperationType = &struct{ op byte }{11}
_BIT_READ OperationType = &struct{ op byte }{12}
_BIT_MODIFY OperationType = &struct{ op byte }{13}
_DELETE OperationType = &struct{ op byte }{14}
)
// Operation contains operation definition.
// This struct is used in client's operate() method.
type Operation struct {
// OpType determines type of operation.
opType OperationType
// used in CDT commands
opSubType operationSubType
// CDT context for nested types
ctx []*CDTContext
encoder func(*Operation, BufferEx) (int, error)
// binName (Optional) determines the name of bin used in operation.
binName string
// binValue (Optional) determines bin value used in operation.
binValue Value
// will be true ONLY for GetHeader() operation
headerOnly bool
// reused determines if the operation is cached. If so, it will cache the
// internal bytes in binValue field and remove the encoder for maximum performance
used bool
}
// cache uses the encoder and caches the packed operation for further use.
func (op *Operation) cache() error {
packer := newPacker()
if _, err := op.encoder(op, packer); err != nil {
return err
}
op.binValue = BytesValue(packer.Bytes())
op.encoder = nil // do not encode anymore; just use the cache
op.used = false // do not encode anymore; just use the cache
return nil
}
// GetOpForBin creates read bin database operation.
func GetOpForBin(binName string) *Operation {
return &Operation{opType: _READ, binName: binName, binValue: NewNullValue()}
}
// GetOp creates read all record bins database operation.
func GetOp() *Operation {
return &Operation{opType: _READ, binValue: NewNullValue()}
}
// GetHeaderOp creates read record header database operation.
func GetHeaderOp() *Operation {
return &Operation{opType: _READ, headerOnly: true, binValue: NewNullValue()}
}
// PutOp creates set database operation.
func PutOp(bin *Bin) *Operation {
return &Operation{opType: _WRITE, binName: bin.Name, binValue: bin.Value}
}
// AppendOp creates string append database operation.
func AppendOp(bin *Bin) *Operation {
return &Operation{opType: _APPEND, binName: bin.Name, binValue: bin.Value}
}
// PrependOp creates string prepend database operation.
func PrependOp(bin *Bin) *Operation {
return &Operation{opType: _PREPEND, binName: bin.Name, binValue: bin.Value}
}
// AddOp creates integer add database operation.
func AddOp(bin *Bin) *Operation {
return &Operation{opType: _ADD, binName: bin.Name, binValue: bin.Value}
}
// TouchOp creates touch record database operation.
func TouchOp() *Operation {
return &Operation{opType: _TOUCH, binValue: NewNullValue()}
}
// DeteleOp creates delete record database operation.
func DeleteOp() *Operation {
return &Operation{opType: _DELETE, binValue: NewNullValue()}
}