| // Copyright 2015 Google Inc. |
| // |
| // 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. |
| // |
| // Author: cheesy@google.com (Steve Hill) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CENTRAL_CONTROLLER_INTERFACE_ADAPTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_CENTRAL_CONTROLLER_INTERFACE_ADAPTER_H_ |
| |
| #include "net/instaweb/rewriter/public/central_controller_interface.h" |
| #include "net/instaweb/rewriter/public/central_controller_callback.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/scoped_ptr.h" |
| #include "pagespeed/kernel/thread/queued_worker_pool.h" |
| |
| namespace net_instaweb { |
| |
| // Adapt CentralControllerInterface onto a more programmer-friendly API. |
| |
| class ExpensiveOperationContext { |
| public: |
| explicit ExpensiveOperationContext(CentralControllerInterface* interface); |
| ~ExpensiveOperationContext(); |
| |
| // Mark the expensive operation as complete. Automatically invoked at |
| // destruction if not explicitly called. |
| void Done(); |
| |
| private: |
| CentralControllerInterface* central_controller_; |
| }; |
| |
| class ExpensiveOperationCallback |
| : public CentralControllerCallback<ExpensiveOperationContext> { |
| public: |
| explicit ExpensiveOperationCallback(QueuedWorkerPool::Sequence* sequence); |
| virtual ~ExpensiveOperationCallback(); |
| |
| private: |
| virtual ExpensiveOperationContext* CreateTransactionContext( |
| CentralControllerInterface* interface); |
| |
| // CentralControllerCallback interface. |
| virtual void RunImpl(scoped_ptr<ExpensiveOperationContext>* context) = 0; |
| virtual void CancelImpl() = 0; |
| }; |
| |
| class CentralControllerInterfaceAdapter { |
| public: |
| // Takes ownership of interface. |
| explicit CentralControllerInterfaceAdapter( |
| CentralControllerInterface* interface); |
| virtual ~CentralControllerInterfaceAdapter(); |
| |
| // Runs callback at an indeterminate time in the future when it is safe |
| // to perform a CPU intensive operation. Or may Cancel the callback at some |
| // point if it is determined that the work cannot be performed. |
| virtual void ScheduleExpensiveOperation(ExpensiveOperationCallback* callback); |
| |
| private: |
| scoped_ptr<CentralControllerInterface> central_controller_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CentralControllerInterfaceAdapter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_CENTRAL_CONTROLLER_INTERFACE_ADAPTER_H_ |