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Support for the HTML5 Geolocation API

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/*
 * Copyright © 2019 The GWT Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gwtproject.geolocation.client;

/**
 * A callback for any asynchronous call that can result in success or failure.
 *
 * @param  The type returned on success
 * @param  The type returned on failure
 */
public interface Callback {

  /**
   * Called when an asynchronous call fails to complete normally.
   *
   * @param reason failure encountered
   */
  void onFailure(F reason);

  /**
   * Called when an asynchronous call completes successfully.
   *
   * @param result the value returned
   */
  void onSuccess(T result);
}