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relay.js-compatible GraphQL servlet

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package graphql.servlet;

import graphql.GraphQLError;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
import java.util.Map;

/**
 * @author Andrew Potter
 */
public interface GraphQLServletListener {
    default RequestCallback onRequest(HttpServletRequest request, HttpServletResponse response) {
        return null;
    }
    default OperationCallback onOperation(GraphQLContext context, String operationName, String query, Map variables) {
        return null;
    }

    interface RequestCallback {
        default void onSuccess(HttpServletRequest request, HttpServletResponse response) {}
        default void onError(HttpServletRequest request, HttpServletResponse response, Throwable throwable) {}
        default void onFinally(HttpServletRequest request, HttpServletResponse response) {}
    }

    interface OperationCallback {
        default void onSuccess(GraphQLContext context, String operationName, String query, Map variables, Object data, Object extensions) {}
        default void onError(GraphQLContext context, String operationName, String query, Map variables, Object data, List errors, Object extensions) {}
        default void onFinally(GraphQLContext context, String operationName, String query, Map variables, Object data, Object extensions) {}
    }
}