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 #include "service/ipc/binder/interface_with_instances_base.h" 18 19 #include <base/logging.h> 20 21 namespace ipc { 22 namespace binder { 23 24 bool InterfaceWithInstancesBase::RegisterInstanceBase( 25 const android::sp<IInterface>& callback, 26 bluetooth::BluetoothInstanceFactory* factory) { 27 VLOG(2) << __func__; 28 CHECK(factory); 29 30 if (!callback.get()) { 31 LOG(ERROR) << "Cannot register a NULL callback"; 32 return false; 33 } 34 35 // Store the callback in the pending list. It will get removed later when the 36 // stack notifies us asynchronously. 37 bluetooth::UUID app_uuid = bluetooth::UUID::GetRandom(); 38 if (!pending_callbacks_.Register(app_uuid, callback)) { 39 LOG(ERROR) << "Failed to store |callback| to map"; 40 return false; 41 } 42 43 // Create a weak pointer and pass that to the callback to prevent an invalid 44 // access later. Since this object is managed using Android's StrongPointer 45 // (sp) we are using a wp here rather than std::weak_ptr. 46 android::wp<InterfaceWithInstancesBase> weak_ptr_to_this(this); 47 48 bluetooth::BluetoothInstanceFactory::RegisterCallback cb = [weak_ptr_to_this]( 49 bluetooth::BLEStatus status, const bluetooth::UUID& in_uuid, 50 std::unique_ptr<bluetooth::BluetoothInstance> instance) { 51 // If the weak pointer was invalidated then there is nothing we can do. 52 android::sp<InterfaceWithInstancesBase> strong_ptr_to_this = 53 weak_ptr_to_this.promote(); 54 if (!strong_ptr_to_this.get()) { 55 VLOG(2) << "InterfaceWithInstancesBase was deleted while instance was" 56 << " being registered"; 57 return; 58 } 59 60 strong_ptr_to_this->OnRegisterInstance(status, in_uuid, 61 std::move(instance)); 62 }; 63 64 if (factory->RegisterInstance(app_uuid, cb)) return true; 65 66 LOG(ERROR) << "Failed to register instance"; 67 pending_callbacks_.Remove(app_uuid); 68 69 return false; 70 } 71 72 void InterfaceWithInstancesBase::UnregisterInstanceBase(int instance_id) { 73 VLOG(2) << __func__; 74 std::lock_guard<std::mutex> lock(maps_lock_); 75 76 id_to_cb_.Remove(instance_id); 77 id_to_instance_.erase(instance_id); 78 } 79 80 void InterfaceWithInstancesBase::UnregisterAllBase() { 81 VLOG(2) << __func__; 82 std::lock_guard<std::mutex> lock(maps_lock_); 83 84 id_to_cb_.Clear(); 85 id_to_instance_.clear(); 86 } 87 88 android::sp<IInterface> InterfaceWithInstancesBase::GetCallback( 89 int instance_id) { 90 return id_to_cb_.Get(instance_id); 91 } 92 93 std::shared_ptr<bluetooth::BluetoothInstance> 94 InterfaceWithInstancesBase::GetInstance(int instance_id) { 95 auto iter = id_to_instance_.find(instance_id); 96 if (iter == id_to_instance_.end()) 97 return std::shared_ptr<bluetooth::BluetoothInstance>(); 98 return iter->second; 99 } 100 101 void InterfaceWithInstancesBase::OnRegisterInstance( 102 bluetooth::BLEStatus status, const bluetooth::UUID& uuid, 103 std::unique_ptr<bluetooth::BluetoothInstance> instance) { 104 VLOG(2) << __func__ << " - status: " << status; 105 106 // Simply remove the callback from |pending_callbacks_| as it no longer 107 // belongs in there. 108 sp<IInterface> callback = pending_callbacks_.Remove(uuid); 109 110 // |callback| might be NULL if it was removed from the pending list, e.g. the 111 // remote process that owns the callback died. 112 if (!callback.get()) { 113 VLOG(1) << "Callback was removed before the call to \"RegisterInstance\" " 114 << "returned; unregistering instance"; 115 return; 116 } 117 118 if (status != bluetooth::BLE_STATUS_SUCCESS) { 119 // The call wasn't successful. Notify the implementation and return. 120 LOG(ERROR) << "Failed to register instance: " << status; 121 OnRegisterInstanceImpl(status, callback, nullptr); 122 return; 123 } 124 125 std::lock_guard<std::mutex> lock(maps_lock_); 126 int instance_id = instance->GetInstanceId(); 127 if (!id_to_cb_.Register(instance_id, callback, this)) { 128 LOG(ERROR) << "Failed to store callback"; 129 OnRegisterInstanceImpl(bluetooth::BLE_STATUS_FAILURE, callback, nullptr); 130 return; 131 } 132 133 VLOG(1) << "Registered BluetoothInstance - ID: " << instance_id; 134 135 auto shared_instance = 136 std::shared_ptr<bluetooth::BluetoothInstance>(instance.release()); 137 id_to_instance_[instance_id] = shared_instance; 138 139 OnRegisterInstanceImpl(status, callback, shared_instance.get()); 140 } 141 142 void InterfaceWithInstancesBase::OnRemoteCallbackRemoved(const int& key) { 143 VLOG(2) << __func__ << " instance_id: " << key; 144 std::lock_guard<std::mutex> lock(maps_lock_); 145 146 // No need to remove from the callback map as the entry should be already 147 // removed when this callback gets called. 148 id_to_instance_.erase(key); 149 } 150 151 } // namespace binder 152 } // namespace ipc 153
