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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.lang3.function;
19  
20  /**
21   * A functional interface like {@link java.util.concurrent.Callable} that declares a {@link Throwable}.
22   *
23   * @param <R> Return type.
24   * @param <E> The kind of thrown exception or error.
25   * @since 3.11
26   */
27  @FunctionalInterface
28  public interface FailableCallable<R, E extends Throwable> {
29  
30      /**
31       * Calls the callable.
32       *
33       * @return The value returned from the callable
34       * @throws E if the callable fails
35       */
36      R call() throws E;
37  }