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This Java module allows you to quickly and easily send emails through Twilio SendGrid using Java.

There is a newer version: 5.0.0-rc.1

package com.sendgrid;

/**
 * An interface describing a callback mechanism for the
 * asynchronous, rate limit aware API connection.
 */
public interface APICallback {
    /**
     * Callback method in case of an error.
     * @param ex the error that was thrown.
     */
    void error(Exception ex);

    /**
     * Callback method in case of a valid response.
     * @param response the valid response.
     */
    void response(Response response);
}