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The SDK of JAVA language for Zuora pricing system

There is a newer version: 3.2.1

/*
* Quickstart API Reference
* Zuora Quickstart API is the API that helps you achieve fundamental use cases.
* It provides a much simplified object model and improved performance, enabling developers to easily learn and use.
*/

package org.openapitools.client;

import java.io.IOException;

import java.util.Map;
import java.util.List;

/**
 * Callback for asynchronous API call.
 *
 * @param  The return type
 */
public interface ApiCallback {
    /**
     * This is called when the API call fails.
     *
     * @param e The exception causing the failure
     * @param statusCode Status code of the response if available, otherwise it would be 0
     * @param responseHeaders Headers of the response if available, otherwise it would be null
     */
    void onFailure(ApiException e, int statusCode, Map> responseHeaders);

    /**
     * This is called when the API call succeeded.
     *
     * @param result The result deserialized from response
     * @param statusCode Status code of the response
     * @param responseHeaders Headers of the response
     */
    void onSuccess(T result, int statusCode, Map> responseHeaders);

    /**
     * This is called when the API upload processing.
     *
     * @param bytesWritten bytes Written
     * @param contentLength content length of request body
     * @param done write end
     */
    void onUploadProgress(long bytesWritten, long contentLength, boolean done);

    /**
     * This is called when the API download processing.
     *
     * @param bytesRead bytes Read
     * @param contentLength content length of the response
     * @param done Read end
     */
    void onDownloadProgress(long bytesRead, long contentLength, boolean done);
}