1 // 2 // Copyright 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 = 49 [weak_ptr_to_this]( 50 bluetooth::BLEStatus status, const bluetooth::Uuid& in_uuid, 51 std::unique_ptr<bluetooth::BluetoothInstance> instance) { 52 // If the weak pointer was invalidated then there is nothing we can do. 53 android::sp<InterfaceWithInstancesBase> strong_ptr_to_this = 54 weak_ptr_to_this.promote(); 55 if (!strong_ptr_to_this.get()) { 56 VLOG(2) << "InterfaceWithInstancesBase was deleted while instance was" 57 << " being registered"; 58 return; 59 } 60 61 strong_ptr_to_this->OnRegisterInstance(status, in_uuid, 62 std::move(instance)); 63 }; 64 65 if (factory->RegisterInstance(app_uuid, cb)) return true; 66 67 LOG(ERROR) << "Failed to register instance"; 68 pending_callbacks_.Remove(app_uuid); 69 70 return false; 71 } 72 73 void InterfaceWithInstancesBase::UnregisterInstanceBase(int instance_id) { 74 VLOG(2) << __func__; 75 std::lock_guard<std::mutex> lock(maps_lock_); 76 77 id_to_cb_.Remove(instance_id); 78 id_to_instance_.erase(instance_id); 79 } 80 81 void InterfaceWithInstancesBase::UnregisterAllBase() { 82 VLOG(2) << __func__; 83 std::lock_guard<std::mutex> lock(maps_lock_); 84 85 id_to_cb_.Clear(); 86 id_to_instance_.clear(); 87 } 88 89 android::sp<IInterface> InterfaceWithInstancesBase::GetCallback( 90 int instance_id) { 91 return id_to_cb_.Get(instance_id); 92 } 93 94 std::shared_ptr<bluetooth::BluetoothInstance> 95 InterfaceWithInstancesBase::GetInstance(int instance_id) { 96 auto iter = id_to_instance_.find(instance_id); 97 if (iter == id_to_instance_.end()) 98 return std::shared_ptr<bluetooth::BluetoothInstance>(); 99 return iter->second; 100 } 101 102 void InterfaceWithInstancesBase::OnRegisterInstance( 103 bluetooth::BLEStatus status, const bluetooth::Uuid& uuid, 104 std::unique_ptr<bluetooth::BluetoothInstance> instance) { 105 VLOG(2) << __func__ << " - status: " << status; 106 107 // Simply remove the callback from |pending_callbacks_| as it no longer 108 // belongs in there. 109 sp<IInterface> callback = pending_callbacks_.Remove(uuid); 110 111 // |callback| might be NULL if it was removed from the pending list, e.g. the 112 // remote process that owns the callback died. 113 if (!callback.get()) { 114 VLOG(1) << "Callback was removed before the call to \"RegisterInstance\" " 115 << "returned; unregistering instance"; 116 return; 117 } 118 119 if (status != bluetooth::BLE_STATUS_SUCCESS) { 120 // The call wasn't successful. Notify the implementation and return. 121 LOG(ERROR) << "Failed to register instance: " << status; 122 OnRegisterInstanceImpl(status, callback, nullptr); 123 return; 124 } 125 126 std::lock_guard<std::mutex> lock(maps_lock_); 127 int instance_id = instance->GetInstanceId(); 128 if (!id_to_cb_.Register(instance_id, callback, this)) { 129 LOG(ERROR) << "Failed to store callback"; 130 OnRegisterInstanceImpl(bluetooth::BLE_STATUS_FAILURE, callback, nullptr); 131 return; 132 } 133 134 VLOG(1) << "Registered BluetoothInstance - ID: " << instance_id; 135 136 auto shared_instance = 137 std::shared_ptr<bluetooth::BluetoothInstance>(instance.release()); 138 id_to_instance_[instance_id] = shared_instance; 139 140 OnRegisterInstanceImpl(status, callback, shared_instance.get()); 141 } 142 143 void InterfaceWithInstancesBase::OnRemoteCallbackRemoved(const int& key) { 144 VLOG(2) << __func__ << " instance_id: " << key; 145 std::lock_guard<std::mutex> lock(maps_lock_); 146 147 // No need to remove from the callback map as the entry should be already 148 // removed when this callback gets called. 149 id_to_instance_.erase(key); 150 } 151 152 } // namespace binder 153 } // namespace ipc 154
