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<!doctype html>
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<div class="content interceptor">
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<ol class="breadcrumb">
<li>Interceptors</li>
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<li >ConnectionInterceptor</li>
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<p class="comment">
<h3>File</h3>
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<p class="comment">
<code>src/app/_interceptors/connection.interceptor.ts</code>
</p>
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<p class="comment">
<h3>Description</h3>
</p>
<p class="comment">
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<p>Intercepts and handles of events from outgoing HTTP request.</p>
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</p>
<section>
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
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<h6><b>Methods</b></h6>
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<ul class="index-list">
<li>
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<a href="#intercept" >intercept</a>
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</li>
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<section>
<h3 id="constructor">Constructor</h3>
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<code>constructor(loggingService: <a href="../injectables/LoggingService.html" target="_self">LoggingService</a>)</code>
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</td>
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<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="14" class="link-to-prism">src/app/_interceptors/connection.interceptor.ts:14</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Initialization of the connection interceptor.</p>
</div>
<div>
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>loggingService</td>
<td>
<code><a href="../injectables/LoggingService.html" target="_self" >LoggingService</a></code>
</td>
<td>
No
</td>
<td>
<code><ul>
<li>A service that provides logging capabilities.</li>
</ul>
</code>
</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="methods">
Methods
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="intercept"></a>
<span class="name">
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<span ><b>intercept</b></span>
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<a href="#intercept"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
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<code>intercept(request: HttpRequest<>, next: <a href="https://angular.io/api/common/http/HttpHandler" target="_blank">HttpHandler</a>)</code>
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</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="29"
class="link-to-prism">src/app/_interceptors/connection.interceptor.ts:29</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Intercepts HTTP requests.</p>
</div>
<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>request</td>
<td>
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<code>HttpRequest&lt;&gt;</code>
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</td>
<td>
No
</td>
<td>
<ul>
<li>An outgoing HTTP request with an optional typed body.</li>
</ul>
</td>
</tr>
<tr>
<td>next</td>
<td>
<code><a href="https://angular.io/api/common/http/HttpHandler" target="_blank" >HttpHandler</a></code>
</td>
<td>
No
</td>
<td>
<ul>
<li>The next HTTP handler or the outgoing request dispatcher.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</div>
<div>
</div>
<div class="io-description">
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<b>Returns : </b> <code>Observable&lt;HttpEvent&lt;&gt;&gt;</code>
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</div>
<div class="io-description">
<p>The forwarded request.</p>
</div>
</td>
</tr>
</tbody>
</table>
</section>
</div>
<div class="tab-pane fade tab-source-code" id="c-source">
<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from &#x27;@angular/common/http&#x27;;
import { Injectable } from &#x27;@angular/core&#x27;;
// Third party imports
import { Observable } from &#x27;rxjs&#x27;;
// Application imports
import { LoggingService } from &#x27;@app/_services/logging.service&#x27;;
import { checkOnlineStatus } from &#x27;@app/_helpers&#x27;;
/** Intercepts and handles of events from outgoing HTTP request. */
@Injectable()
export class ConnectionInterceptor implements HttpInterceptor {
/**
* Initialization of the connection interceptor.
*
* @param loggingService - A service that provides logging capabilities.
*/
constructor(private loggingService: LoggingService) {}
/**
* Intercepts HTTP requests.
*
* @param request - An outgoing HTTP request with an optional typed body.
* @param next - The next HTTP handler or the outgoing request dispatcher.
* @returns The forwarded request.
*/
intercept(request: HttpRequest&lt;unknown&gt;, next: HttpHandler): Observable&lt;HttpEvent&lt;unknown&gt;&gt; {
checkOnlineStatus().then((online) &#x3D;&gt; {
if (!online) {
this.loggingService.sendErrorLevelMessage(&#x27;No internet connection on device!&#x27;, this, {
error: &#x60;NetworkError when attempting to fetch resource ${request.url}.&#x60;,
});
return;
} else {
return next.handle(request);
}
});
return next.handle(request);
}
}
</code></pre>
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