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exists_command.go
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exists_command.go
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// Copyright 2013-2016 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
import (
. "github.com/aerospike/aerospike-client-go/types"
)
// guarantee existsCommand implements command interface
var _ command = &existsCommand{}
type existsCommand struct {
*singleCommand
policy *BasePolicy
exists bool
}
func newExistsCommand(cluster *Cluster, policy *BasePolicy, key *Key) *existsCommand {
return &existsCommand{
singleCommand: newSingleCommand(cluster, key),
policy: policy,
}
}
func (cmd *existsCommand) getPolicy(ifc command) Policy {
return cmd.policy.GetBasePolicy()
}
func (cmd *existsCommand) writeBuffer(ifc command) error {
return cmd.setExists(cmd.policy.GetBasePolicy(), cmd.key)
}
func (cmd *existsCommand) parseResult(ifc command, conn *Connection) error {
// Read header.
if _, err := conn.Read(cmd.dataBuffer, int(_MSG_TOTAL_HEADER_SIZE)); err != nil {
return err
}
resultCode := cmd.dataBuffer[13] & 0xFF
if resultCode != 0 && ResultCode(resultCode) != KEY_NOT_FOUND_ERROR {
return NewAerospikeError(ResultCode(resultCode))
}
cmd.exists = resultCode == 0
if err := cmd.emptySocket(conn); err != nil {
return err
}
return nil
}
func (cmd *existsCommand) Exists() bool {
return cmd.exists
}
func (cmd *existsCommand) Execute() error {
return cmd.execute(cmd)
}