Files: 864bc27090fe788a4bf5a86c00246ca6e4391dd0 / exoInterface.js
4103 bytesRaw
1 | const PortManager = require('./portManager.js') |
2 | const Message = require('primea-message') |
3 | |
4 | module.exports = class ExoInterface { |
5 | /** |
6 | * the ExoInterface manages the varous message passing functions and provides |
7 | * an interface for the containers to use |
8 | * @param {Object} opts |
9 | * @param {Object} opts.id |
10 | * @param {Object} opts.state |
11 | * @param {Object} opts.hypervisor |
12 | * @param {Object} opts.Container |
13 | */ |
14 | constructor (opts) { |
15 | this.state = opts.state |
16 | this.hypervisor = opts.hypervisor |
17 | this.id = opts.id |
18 | this.container = new opts.container.Constructor(this, opts.container.args) |
19 | |
20 | this.ticks = 0 |
21 | this.containerState = 'idle' |
22 | |
23 | // create the port manager |
24 | this.ports = new PortManager(Object.assign({ |
25 | exInterface: this |
26 | }, opts)) |
27 | } |
28 | |
29 | /** |
30 | * adds a message to this containers message queue |
31 | * @param {string} portName |
32 | * @param {object} message |
33 | */ |
34 | queue (portName, message) { |
35 | message._hops++ |
36 | this.ports.queue(portName, message) |
37 | if (this.containerState !== 'running') { |
38 | this.containerState = 'running' |
39 | if (portName) { |
40 | this._runNextMessage() |
41 | } else { |
42 | this.run(message, true) |
43 | } |
44 | } |
45 | } |
46 | |
47 | // waits for the next message |
48 | async _runNextMessage () { |
49 | // check if the ports are saturated, if so we don't have to wait on the |
50 | // scheduler |
51 | if (!this.ports.isSaturated()) { |
52 | await this.hypervisor.scheduler.wait(this.ticks, this.id) |
53 | } |
54 | |
55 | let message = this.ports.peekNextMessage() |
56 | if (message) { |
57 | if (this.ticks < message._fromTicks) { |
58 | this.ticks = message._fromTicks |
59 | // check for tie messages |
60 | this.hypervisor.scheduler.update(this) |
61 | if (!this.ports.isSaturated()) { |
62 | await this.hypervisor.scheduler.wait(this.ticks, this.id) |
63 | message = this.ports.peekNextMessage() |
64 | } |
65 | } |
66 | message.fromPort.messages.shift() |
67 | // run the next message |
68 | this.run(message) |
69 | } else { |
70 | // if no more messages then shut down |
71 | this.hypervisor.scheduler.done(this) |
72 | } |
73 | } |
74 | |
75 | /** |
76 | * run the kernels code with a given enviroment |
77 | * The Kernel Stores all of its state in the Environment. The Interface is used |
78 | * to by the VM to retrive infromation from the Environment. |
79 | * @returns {Promise} |
80 | */ |
81 | async run (message, init = false) { |
82 | let result |
83 | message.ports.forEach(port => this.ports._unboundPorts.add(port)) |
84 | if (message.data === 'delete') { |
85 | this.ports._delete(message.fromName) |
86 | } else { |
87 | const method = init ? 'initailize' : 'run' |
88 | |
89 | try { |
90 | result = await this.container[method](message) || {} |
91 | } catch (e) { |
92 | result = { |
93 | exception: true, |
94 | exceptionError: e |
95 | } |
96 | } |
97 | } |
98 | this.ports.clearUnboundedPorts() |
99 | // message.response(result) |
100 | this._runNextMessage() |
101 | return result |
102 | } |
103 | |
104 | /** |
105 | * updates the number of ticks that the container has run |
106 | * @param {Number} count - the number of ticks to add |
107 | */ |
108 | incrementTicks (count) { |
109 | this.ticks += count |
110 | this.hypervisor.scheduler.update(this) |
111 | } |
112 | |
113 | /** |
114 | * creates a new message |
115 | * @param {*} data |
116 | */ |
117 | createMessage (opts) { |
118 | const message = new Message(opts) |
119 | for (const port of message.ports) { |
120 | if (this.ports.isBound(port)) { |
121 | throw new Error('message must not contain bound ports') |
122 | } |
123 | } |
124 | return message |
125 | } |
126 | |
127 | /** |
128 | * sends a message to a given port |
129 | * @param {Object} portRef - the port |
130 | * @param {Message} message - the message |
131 | */ |
132 | async send (port, message) { |
133 | // set the port that the message came from |
134 | message._fromTicks = this.ticks |
135 | message.ports.forEach(port => this.ports._unboundPorts.delete(port)) |
136 | |
137 | // if (this.currentMessage !== message && !message.responsePort) { |
138 | // this.currentMessage._addSubMessage(message) |
139 | // } |
140 | |
141 | if (port.destId) { |
142 | const id = port.destId |
143 | const instance = await this.hypervisor.getInstance(id) |
144 | instance.queue(port.destName, message) |
145 | } else { |
146 | port.destPort.messages.push(message) |
147 | } |
148 | } |
149 | } |
150 |
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