| /* |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * Declares ignite::commom::Promise class template. |
| */ |
| |
| |
| #ifndef _IGNITE_PROMISE |
| #define _IGNITE_PROMISE |
| |
| #include <ignite/common/common.h> |
| #include <ignite/common/shared_state.h> |
| |
| #include <ignite/ignite_error.h> |
| #include <ignite/future.h> |
| |
| namespace ignite |
| { |
| namespace common |
| { |
| /** |
| * Promise class template. Used to set result of the asynchroniously |
| * started computation. |
| * |
| * @tparam T Promised value type. |
| */ |
| template<typename T> |
| class Promise |
| { |
| public: |
| /** Template value type */ |
| typedef T ValueType; |
| |
| /** |
| * Constructor. |
| */ |
| Promise() : |
| state(new SharedState<ValueType>()) |
| { |
| // No-op. |
| } |
| |
| /** |
| * Destructor. |
| */ |
| ~Promise() |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| if (!state0->IsSet()) |
| state0->SetError(IgniteError(IgniteError::IGNITE_ERR_FUTURE_STATE, |
| "Broken promise. Value will never be set due to internal error.")); |
| } |
| |
| |
| /** |
| * Get future for this promise. |
| * |
| * @return New future instance. |
| */ |
| Future<ValueType> GetFuture() const |
| { |
| return Future<ValueType>(state); |
| } |
| |
| /** |
| * Set value. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| * @param val Value to set. |
| */ |
| void SetValue(std::auto_ptr<ValueType> val) |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| return state0->SetValue(val); |
| } |
| |
| /** |
| * Set error. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| * @param err Error to set. |
| */ |
| void SetError(const IgniteError& err) |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| state0->SetError(err); |
| } |
| |
| /** |
| * Set cancel target. |
| */ |
| void SetCancelTarget(std::auto_ptr<Cancelable>& target) |
| { |
| state.Get()->SetCancelTarget(target); |
| } |
| |
| private: |
| IGNITE_NO_COPY_ASSIGNMENT(Promise); |
| |
| /** Shared state. */ |
| concurrent::SharedPointer< SharedState<ValueType> > state; |
| }; |
| |
| /** |
| * Specialization for void. |
| */ |
| template<> |
| class Promise<void> |
| { |
| public: |
| /** Template value type */ |
| typedef void ValueType; |
| |
| /** |
| * Constructor. |
| */ |
| Promise() : |
| state(new SharedState<ValueType>()) |
| { |
| // No-op. |
| } |
| |
| /** |
| * Destructor. |
| */ |
| ~Promise() |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| if (!state0->IsSet()) |
| state0->SetError(IgniteError(IgniteError::IGNITE_ERR_FUTURE_STATE, |
| "Broken promise. Value will never be set due to internal error.")); |
| } |
| |
| |
| /** |
| * Get future for this promise. |
| * |
| * @return New future instance. |
| */ |
| Future<ValueType> GetFuture() const |
| { |
| return Future<ValueType>(state); |
| } |
| |
| /** |
| * Mark as complete. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| */ |
| void SetValue() |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| return state0->SetValue(); |
| } |
| |
| /** |
| * Set error. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| * @param err Error to set. |
| */ |
| void SetError(const IgniteError& err) |
| { |
| SharedState<ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| state0->SetError(err); |
| } |
| |
| /** |
| * Set cancel target. |
| */ |
| void SetCancelTarget(std::auto_ptr<Cancelable>& target) |
| { |
| state.Get()->SetCancelTarget(target); |
| } |
| |
| private: |
| IGNITE_NO_COPY_ASSIGNMENT(Promise); |
| |
| /** Shared state. */ |
| concurrent::SharedPointer< SharedState<ValueType> > state; |
| }; |
| |
| /** |
| * Specialization for SharePointer type. |
| */ |
| template<typename T> |
| class Promise< concurrent::SharedPointer<T> > |
| { |
| public: |
| /** Template value type */ |
| typedef T ValueType; |
| |
| /** Template value type wrapped in shared pointer */ |
| typedef concurrent::SharedPointer<ValueType> SP_ValueType; |
| |
| /** |
| * Constructor. |
| */ |
| Promise() : |
| state(new SharedState<SP_ValueType>()) |
| { |
| // No-op. |
| } |
| |
| /** |
| * Destructor. |
| */ |
| ~Promise() |
| { |
| SharedState<SP_ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| if (!state0->IsSet()) |
| state0->SetError(IgniteError(IgniteError::IGNITE_ERR_FUTURE_STATE, |
| "Broken promise. Value will never be set due to internal error.")); |
| } |
| |
| |
| /** |
| * Get future for this promise. |
| * |
| * @return New future instance. |
| */ |
| Future<SP_ValueType> GetFuture() const |
| { |
| return Future<SP_ValueType>(state); |
| } |
| |
| /** |
| * Set value. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| * @param val Value to set. |
| */ |
| void SetValue(SP_ValueType val) |
| { |
| SharedState<SP_ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| return state0->SetValue(val); |
| } |
| |
| /** |
| * Set error. |
| * |
| * @throw IgniteError with IgniteError::IGNITE_ERR_FUTURE_STATE if error or value has been set already. |
| * @param err Error to set. |
| */ |
| void SetError(const IgniteError& err) |
| { |
| SharedState<SP_ValueType>* state0 = state.Get(); |
| |
| assert(state0 != 0); |
| |
| state0->SetError(err); |
| } |
| |
| /** |
| * Set cancel target. |
| */ |
| void SetCancelTarget(std::auto_ptr<Cancelable>& target) |
| { |
| state.Get()->SetCancelTarget(target); |
| } |
| |
| private: |
| IGNITE_NO_COPY_ASSIGNMENT(Promise); |
| |
| /** Shared state. */ |
| concurrent::SharedPointer< SharedState<SP_ValueType> > state; |
| }; |
| } |
| } |
| |
| #endif //_IGNITE_PROMISE |