Apollo|Stateful Links

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Stateful Links

某些 Link 需要在请求之间共享 state,从而完成额外的功能.
Stateful links 总是重写ApolloLink

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import { ApolloLink } from 'apollo-link';

class OperationCountLink extends ApolloLink {
  constructor() {
    super();
    this.operations = 0;
  }
  request(operation, forward) {
    this.operations++
    return forward(operation);
  }
}

const link = new OperationCountLink();