1 // 2 // Copyright (C) 2015 Google, Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at: 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #pragma once 18 19 #include <memory> 20 21 #include <base/macros.h> 22 #include <base/memory/ref_counted.h> 23 24 namespace bluetooth { 25 class Adapter; 26 } // namespace bluetooth 27 28 namespace ipc { 29 30 class IPCHandler; 31 32 // IPCManager is a class for initializing and running supported IPC mechanisms. 33 // It manages the life-time of different IPC flavors that are available on the 34 // system. There are two flavors: a Linux sequential packet domain socket based 35 // system and one based on the Binder-based android.bluetooth framework. 36 class IPCManager { 37 public: 38 // Possible IPC types. 39 enum Type { 40 TYPE_LINUX, // IPC based on a Linux sequential packet domain socket 41 TYPE_BINDER // IPC based on the Binder 42 }; 43 44 // Interface for observing events from an IPC mechanism. These methods will be 45 // called on the thread that started the particular IPC type. 46 class Delegate { 47 public: 48 Delegate() = default; 49 virtual ~Delegate() = default; 50 51 // Called when an IPC mechanism has successfully started and is ready for 52 // client connections. 53 virtual void OnIPCHandlerStarted(Type type) = 0; 54 55 // Called when an IPC mechanism has stopped. This may happen due to an error 56 // in initialization or due to a regular shut down routine. 57 virtual void OnIPCHandlerStopped(Type type) = 0; 58 59 private: 60 DISALLOW_COPY_AND_ASSIGN(Delegate); 61 }; 62 63 explicit IPCManager(bluetooth::Adapter* adapter); 64 ~IPCManager(); 65 66 // Initialize the underlying IPC handler based on |type|, if that type has not 67 // yet been initialized and returns true on success. Returns false if that 68 // type has already been initialized or an error occurs. 69 // 70 // If TYPE_LINUX is given, the file path to use for the domain socket will be 71 // obtained from the global Settings object. Hence, the Settings object must 72 // have been initialized before calling this method. 73 // 74 // |delegate| must out-live the IPCManager and the underlying handler. Users 75 // can guarantee proper clean up by deallocating |delegate| when or after 76 // Delegate::OnIPCHandlerStopped is called. It is safe to destroy |delegate| 77 // after destroying the IPCManager instance, as the destructor will join and 78 // clean up all underlying threads. 79 bool Start(Type type, Delegate* delegate); 80 81 // Returns true if an IPC type has been initialized. 82 bool BinderStarted() const; 83 bool LinuxStarted() const; 84 85 private: 86 IPCManager() = default; 87 88 // Pointers to the different IPC handler classes. These are initialized and 89 // owned by us. 90 scoped_refptr<IPCHandler> binder_handler_; 91 scoped_refptr<IPCHandler> linux_handler_; 92 93 // The Bluetooth adapter instance. This is owned by Daemon so we keep a raw 94 // pointer to it. 95 bluetooth::Adapter* adapter_; 96 97 DISALLOW_COPY_AND_ASSIGN(IPCManager); 98 }; 99 100 } // namespace ipc 101
