Research
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apollo-link
Advanced tools
Readme
apollo-link
is a standard interface for modifying control flow of GraphQL requests and fetching GraphQL results, designed to provide a simple GraphQL client that is capable of extensions.
The targeted use cases of apollo-link
are highlighted below:
Apollo Link is the interface for creating new links in your application.
The client sends a request as a method call to a link and can recieve one or more (in the case of subscriptions) responses from the server. The responses are returned using the Observer pattern.
Results from the server can be provided by calling next(result)
on the observer. In the case of a network/transport error (not a GraphQL Error) the error(err)
method can be used to indicate a response will not be recieved. If multiple responses are not supported by the link, complete()
should be called to inform the client no further data will be provided.
In the case of an intermediate link, a second argument to request(operation, forward)
is the link to forward(operation)
to. forward
returns an observable and it can be returned directly or subscribed to.
forward(operation).subscribe({
next: result => {
handleTheResult(result)
},
error: error => {
handleTheNetworkError(error)
},
});
class import { ApolloLink, Observable } from 'apollo-link';
export class CustomApolloLink extends ApolloLink {
request(operation /*, forward*/) {
//Whether no one is listening anymore
let unsubscribed = false;
return new Observable(observer => {
somehowGetOperationToServer(operation, (error, result) => {
if (unsubscribed) return;
if (error) {
//Network error
observer.error(error);
} else {
observer.next(result);
observer.complete(); //If subscriptions not supported
}
});
function unsubscribe() {
unsubscribed = true;
}
return unsubscribe;
});
}
}
npm install apollo-link --save
FAQs
Flexible, lightweight transport layer for GraphQL
We found that apollo-link demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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