pkg/chain/callback.go

//Copyright 2017 Huawei Technologies Co., Ltd
//
//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 chain

import (
	"fmt"
	"github.com/ServiceComb/service-center/pkg/util"
)

type Result struct {
	OK   bool
	Err  error
	Args []interface{}
}

func (r Result) String() string {
	if r.OK {
		return "OK"
	}
	return fmt.Sprintf("FAIL(error: %s)", r.Err)
}

type Callback struct {
	Func func(r Result)
}

func (cb *Callback) Invoke(r Result) {
	go cb.syncInvoke(r)
}

func (cb *Callback) syncInvoke(r Result) {
	defer util.RecoverAndReport()
	if cb.Func == nil {
		util.Logger().Errorf(nil, "Callback function is nil. result: %s,", r)
		return
	}
	cb.Func(r)
}

func (cb *Callback) Fail(err error, args ...interface{}) {
	cb.Invoke(Result{
		OK:   false,
		Err:  err,
		Args: args,
	})
}

func (cb *Callback) Success(args ...interface{}) {
	cb.Invoke(Result{
		OK:   true,
		Args: args,
	})
}