/
executor.go
93 lines (84 loc) · 2.12 KB
/
executor.go
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/*
* Radon
*
* Copyright 2018 The Radon Authors.
* Code is licensed under the GPLv3.
*
*/
package executor
import (
"backend"
"planner"
"xcontext"
"github.com/pkg/errors"
"github.com/xelabs/go-mysqlstack/sqlparser/depends/sqltypes"
"github.com/xelabs/go-mysqlstack/xlog"
)
// Executor interface.
type Executor interface {
Execute(*xcontext.ResultContext) error
}
// Tree is a container for all executors
type Tree struct {
log *xlog.Log
children []Executor
txn backend.Transaction
planTree *planner.PlanTree
}
// NewTree creates the new execute tree.
func NewTree(log *xlog.Log, planTree *planner.PlanTree, txn backend.Transaction) *Tree {
return &Tree{
log: log,
txn: txn,
planTree: planTree,
children: make([]Executor, 0, 16),
}
}
// Add adds a executor to the tree
func (et *Tree) Add(executor Executor) error {
et.children = append(et.children, executor)
return nil
}
// Execute executes all Executor.Execute
func (et *Tree) Execute() (*sqltypes.Result, error) {
// build tree
for _, plan := range et.planTree.Plans() {
switch plan.Type() {
case planner.PlanTypeDDL:
executor := NewDDLExecutor(et.log, plan, et.txn)
if err := et.Add(executor); err != nil {
return nil, err
}
case planner.PlanTypeInsert:
executor := NewInsertExecutor(et.log, plan, et.txn)
if err := et.Add(executor); err != nil {
return nil, err
}
case planner.PlanTypeDelete:
executor := NewDeleteExecutor(et.log, plan, et.txn)
if err := et.Add(executor); err != nil {
return nil, err
}
case planner.PlanTypeUpdate:
executor := NewUpdateExecutor(et.log, plan, et.txn)
if err := et.Add(executor); err != nil {
return nil, err
}
case planner.PlanTypeSelect:
executor := NewSelectExecutor(et.log, plan, et.txn)
if err := et.Add(executor); err != nil {
return nil, err
}
default:
return nil, errors.Errorf("unsupported.execute.type:%v", plan.Type())
}
}
// execute all
rsCtx := xcontext.NewResultContext()
for _, executor := range et.children {
if err := executor.Execute(rsCtx); err != nil {
return nil, err
}
}
return rsCtx.Results, nil
}