Callback.java

/*
 * Copyright 2013 Julien Viet
 *
 * 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 vietj.promises;

/**
 * A callback for promise.
 *
 * @author Julien Viet
 */
public interface Callback<A, R> {

  /**
   * Handle the arg and returns a result.
   *
   * @param arg the argument
   * @return the result
   */
  R call(A arg) throws Exception;

}