hunt.database.base.impl.command.CommandBase source code

1 /*
2  * Copyright (C) 2019, HuntLabs
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 
18 module hunt.database.base.impl.command.CommandBase;
19 
20 import hunt.database.base.impl.command.CommandResponse;
21 import hunt.logging;
22 
23 
24 interface ICommand {
25 
26     bool handlerExist();
27     
28     void fail(Throwable err);
29 
30     void notifyResponse(ICommandResponse response);
31 }
32 
33 /**
34  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
35  */
36 abstract class CommandBase(R) : ICommand {
37 
38     ResponseHandler!R handler;
39 
40     final bool handlerExist() { return handler !is null; }
41 
42     final void fail(Throwable err) {
43         handler(failedResponse!R(err));
44     }
45 
46     void notifyResponse(ICommandResponse response) {
47         if(handler !is null) {
48             CommandResponse!(R) r = cast(CommandResponse!(R))response;
49             if(r is null) {
50                 warningf("Can't cast %s", (cast(Object)response).toString());
51             } else {
52                 handler(r);
53             }
54         }
55     }
56 }