Nuxt/examples/web-worker/pages/index.vue

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<template>
<section class="container">
<div>
<AppLogo />
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<h1 class="title">
web-worker
</h1>
<h2 class="subtitle">
Nuxt.js project
</h2>
<p>{{ notification }}</p>
<ul class="list">
<li>Number of Web Workers: {{ workers.length }}</li>
<li>Number of long Running Workers: {{ longRunningWorkers.length }}</li>
<li>Number of unused Workers: {{ workers.filter(w => !w.inUse).length }}</li>
</ul>
<div class="links">
<a
:class="needWorkerSetup ? 'hidden' : 'visible'"
class="button button--green"
@click="test"
>
Test Worker
</a>
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<a
:class="needWorkerSetup ? 'hidden' : 'visible'"
class="button button--green"
@click="long(4000)"
>
Execute long running Worker
</a>
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<a
:class="needWorkerSetup || !longRunningWorkers.length ? 'hidden' : 'visible'"
class="button button--green"
@click="freeWorker"
>
Free long running Worker
</a>
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<a
class="button button--grey"
@click="removeWorker"
>
Remove Web Worker
</a>
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<a
class="button button--grey"
@click="createWorkers"
>
Create more Workers
</a>
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</div>
</div>
</section>
</template>
<script>
import AppLogo from '~/components/AppLogo.vue'
export default {
components: {
AppLogo
},
data () {
return {
notification: '',
workers: [],
workerIndex: 0,
longRunningWorkers: [],
longIndex: 0
}
},
computed: {
needWorkerSetup () {
return this.workers.length === 0 && this.longRunningWorkers.length === 0
}
},
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watch: {
workers (workers) {
if (workers.length === 0) this.notification = 'Zero free Web Workers - click "Create more Workers"'
}
},
methods: {
test () {
const worker = this.workers[this.workerIndex++ % this.workers.length]
if (worker) {
worker.onmessage = (event) => {
this.notification = event.data.hello
}
}
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if (worker) worker.postMessage({ hello: 'world' })
else this.notification = 'No more test workers available'
},
long (milliseconds) {
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let worker = this.workers.shift()
if (worker) {
worker.onmessage = (event) => {
this.notification = `expensive made ${event.data} loops`
worker.onmessage = null
this.workers.push(...this.longRunningWorkers.splice(this.longRunningWorkers.indexOf(worker), 1))
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}
this.longRunningWorkers.push(worker)
} else {
worker = this.longRunningWorkers[ this.longIndex++ % this.longRunningWorkers.length]
}
worker.postMessage({ action: 'expensive', time: milliseconds })
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},
freeWorker () {
// we can't really free a worker, we can only terminate it and create a new
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const worker = this.longRunningWorkers.pop()
worker.onmessage = null
worker.terminate()
this.workers.push(this.$worker.createWorker())
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this.notification = 'Worker freed'
},
removeWorker () {
const worker = this.workers.pop() || this.longRunningWorkers.pop()
if (!worker) return
if (this.longRunningWorkers.indexOf(worker) > -1) this.longRunningWorkers.splice(this.longRunningWorkers.indexOf(worker), 1)
worker.onmessage = null
worker.terminate()
},
createWorkers () {
if (process.client) {
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for(let i = 0, len = navigator.hardwareConcurrency || 1; i < len; i++) {
this.workers.push(this.$worker.createWorker())
}
this.notification = 'Go nuts!'
}
}
}
}
</script>
<style>
.hidden {
visibility: hidden;
}
.visible {
visibility: visible;
}
.container {
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
text-align: center;
}
.title {
font-family: "Quicksand", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; /* 1 */
display: block;
font-weight: 300;
font-size: 100px;
color: #35495e;
letter-spacing: 1px;
}
.subtitle {
font-weight: 300;
font-size: 42px;
color: #526488;
word-spacing: 5px;
padding-bottom: 15px;
}
.links {
padding-top: 15px;
}
.list {
text-align: left;
color: #526488;
list-style: none;
}
</style>