dxx.app.job source code

1 /**
2 Copyright 2018 Mark Fisher
3 
4 Permission is hereby granted, free of charge, to any person obtaining a copy of
5 this software and associated documentation files (the "Software"), to deal in
6 the Software without restriction, including without limitation the rights to
7 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
8 of the Software, and to permit persons to whom the Software is furnished to do
9 so, subject to the following conditions:
10 
11 The above copyright notice and this permission notice shall be included in all
12 copies or substantial portions of the Software.
13 
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 SOFTWARE.
21 **/
22 module dxx.app.job;
23 
24 private import std.exception;
25 
26 private import core.thread;
27 
28 private import dxx.util;
29 private import dxx.app;
30 
31 interface Job : NotificationSource {
32     enum Status {
33         NOT_STARTED,
34         STARTED,
35         SUSPENDED,
36         TERMINATED,
37         THROWN_EXCEPTION
38     }
39     struct JobStatusEvent {
40       Job job;
41       Status status;
42     }
43 
44     @property pure @safe nothrow @nogc
45     const(Status) status() const;
46 
47     @property pure @safe nothrow @nogc
48     bool terminated() const;
49 
50     @property pure @safe nothrow @nogc
51     ref inout(Exception) thrownException() inout;
52 
53     nothrow
54     void execute(InjectionContainer injector=InjectionContainer.getInstance);
55 
56     //void join();
57 	//void setProperty(string k,string v);
58 	//string getProperty(string k);
59 }
60 
61 abstract class JobBase : SyncNotificationSource, Job {
62     Status _status = Status.NOT_STARTED;
63     Exception _thrownException;
64     InjectionContainer _injector;
65     
66     @property pure @safe nothrow @nogc
67     const(Status) status() const {
68         return _status;
69     }
70     @property nothrow
71     void status(Status s) {
72       _status = s;
73       auto e = JobStatusEvent(this,s);
74       (cast(shared)this).send!JobStatusEvent(&e);
75     }
76     @property pure @safe nothrow @nogc
77     bool terminated() const {
78         return (status == Status.TERMINATED) || (status == Status.THROWN_EXCEPTION);
79     }
80     @property @safe nothrow
81     ref inout(Exception) thrownException() inout {
82         return _thrownException;
83     }
84     @property @safe nothrow
85     ref inout(InjectionContainer) injector() inout {
86     	return _injector;
87     }
88 
89     nothrow
90     void execute(InjectionContainer injector=InjectionContainer.getInstance) {
91         try {
92             enforce(_status == Status.NOT_STARTED);
93             _injector = injector; 
94             setup;
95             status(Status.STARTED);
96             process;
97             status = Status.TERMINATED;
98         } catch(Exception e) {
99             MsgLog.warning("Exception: " ~ e.message);
100             _thrownException = e;
101             status = Status.THROWN_EXCEPTION;
102         } finally {
103             terminate;
104         }
105     }
106 
107     static void join(const(Job) j) {
108         while(!j.terminated) {
109             Thread.sleep( dur!("msecs")( 10 ) );
110         }
111     }
112     
113     void setup() {}
114 
115     abstract void process();
116     
117     nothrow void terminate() {}
118     
119     void setProperty(T)(string k,T v) {
120         injector.setParam(v,k);
121     }    
122 
123     T getProperty(T)(string k) {
124         return injector.getParm(k);
125     }   
126 
127     this() {
128     }
129 }
130 
131 class JobDelegate(alias F) : JobBase {
132     override void process() {
133         F();
134     }
135 }