-
Notifications
You must be signed in to change notification settings - Fork 0
/
task.go
61 lines (54 loc) · 1.82 KB
/
task.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
// Copyright 2020 The ZKits Project Authors.
//
// 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 runner
// Task interface defines the task units that the runner can run.
type Task interface {
// Execute method is the entry point for the task to run.
// When the task is run by the runner, this method is executed first.
Execute() error
// Shutdown method is the method to exit the task.
// When the exit is run, this method will be called.
Shutdown() error
}
// NewTaskFromFunc creates a runnable task from a given function.
func NewTaskFromFunc(execute func() error, shutdown ...func() error) Task {
switch len(shutdown) {
case 0:
return &funcTask{execute: execute}
case 1:
return &funcTask{execute: execute, shutdown: shutdown[0]}
default:
panic("NewTaskFromFunc(): too many shutdown function.")
}
}
// The funcTask type is used to wrap a given function into a runnable task.
type funcTask struct {
execute, shutdown func() error
}
// Execute method executes the given execute function.
// If the given function is nil, ignored.
func (t *funcTask) Execute() error {
if t.execute == nil {
return nil
}
return t.execute()
}
// Shutdown method executes the given shutdown function.
// If the given function is nil, ignored.
func (t *funcTask) Shutdown() error {
if t.shutdown == nil {
return nil
}
return t.shutdown()
}