| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| #ifndef _DECAF_UTIL_CONCURRENT_CALLABLE_H_ |
| #define _DECAF_UTIL_CONCURRENT_CALLABLE_H_ |
| |
| #include <decaf/util/Config.h> |
| #include <decaf/lang/Exception.h> |
| |
| namespace decaf { |
| namespace util { |
| namespace concurrent { |
| |
| /** |
| * Base class of all Callable<T> objects, used to allow identification via type casting. |
| */ |
| class CallableType { |
| public: |
| |
| virtual ~CallableType() {} |
| }; |
| |
| /** |
| * A task that returns a result and may throw an exception. Implementors define a single method with no |
| * arguments called call. This interface differs from the Runnable interface in that a Callable object |
| * can return a result and is allowed to throw an exceptions from its call method. |
| * |
| * The Executors class contains utility methods to convert from other common forms to Callable classes. |
| * |
| * @since 1.0 |
| */ |
| template<typename V> |
| class Callable : public CallableType { |
| public: |
| |
| virtual ~Callable() {} |
| |
| /** |
| * Computes a result, or throws an exception if unable to do so. |
| * @return |
| * Computed Result. |
| * @throws Exception |
| * If unable to compute a result. |
| */ |
| virtual V call() = 0; |
| |
| }; |
| |
| }}} |
| |
| #endif /*_DECAF_UTIL_CONCURRENT_CALLABLE_H_*/ |