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//
// 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.
//
#include "service/ipc/binder/interface_with_instances_base.h"
#include <base/logging.h>
namespace ipc {
namespace binder {
bool InterfaceWithInstancesBase::RegisterInstanceBase(
const android::sp<IInterface>& callback,
bluetooth::BluetoothInstanceFactory* factory) {
VLOG(2) << __func__;
CHECK(factory);
if (!callback.get()) {
LOG(ERROR) << "Cannot register a NULL callback";
return false;
}
// Store the callback in the pending list. It will get removed later when the
// stack notifies us asynchronously.
bluetooth::Uuid app_uuid = bluetooth::Uuid::GetRandom();
if (!pending_callbacks_.Register(app_uuid, callback)) {
LOG(ERROR) << "Failed to store |callback| to map";
return false;
}
// Create a weak pointer and pass that to the callback to prevent an invalid
// access later. Since this object is managed using Android's StrongPointer
// (sp) we are using a wp here rather than std::weak_ptr.
android::wp<InterfaceWithInstancesBase> weak_ptr_to_this(this);
bluetooth::BluetoothInstanceFactory::RegisterCallback cb =
[weak_ptr_to_this](
bluetooth::BLEStatus status, const bluetooth::Uuid& in_uuid,
std::unique_ptr<bluetooth::BluetoothInstance> instance) {
// If the weak pointer was invalidated then there is nothing we can do.
android::sp<InterfaceWithInstancesBase> strong_ptr_to_this =
weak_ptr_to_this.promote();
if (!strong_ptr_to_this.get()) {
VLOG(2) << "InterfaceWithInstancesBase was deleted while instance was"
<< " being registered";
return;
}
strong_ptr_to_this->OnRegisterInstance(status, in_uuid,
std::move(instance));
};
if (factory->RegisterInstance(app_uuid, cb)) return true;
LOG(ERROR) << "Failed to register instance";
pending_callbacks_.Remove(app_uuid);
return false;
}
void InterfaceWithInstancesBase::UnregisterInstanceBase(int instance_id) {
VLOG(2) << __func__;
std::lock_guard<std::mutex> lock(maps_lock_);
id_to_cb_.Remove(instance_id);
id_to_instance_.erase(instance_id);
}
void InterfaceWithInstancesBase::UnregisterAllBase() {
VLOG(2) << __func__;
std::lock_guard<std::mutex> lock(maps_lock_);
id_to_cb_.Clear();
id_to_instance_.clear();
}
void InterfaceWithInstancesBase::ForEachCallback(
const std::function<void(IInterface*)>& func) {
VLOG(2) << __func__;
std::lock_guard<std::mutex> lock(maps_lock_);
for (auto& pair : id_to_instance_) {
auto cb = id_to_cb_.Get(pair.first);
func(cb.get());
}
}
android::sp<IInterface> InterfaceWithInstancesBase::GetCallback(
int instance_id) {
return id_to_cb_.Get(instance_id);
}
std::shared_ptr<bluetooth::BluetoothInstance>
InterfaceWithInstancesBase::GetInstance(int instance_id) {
auto iter = id_to_instance_.find(instance_id);
if (iter == id_to_instance_.end())
return std::shared_ptr<bluetooth::BluetoothInstance>();
return iter->second;
}
void InterfaceWithInstancesBase::OnRegisterInstance(
bluetooth::BLEStatus status, const bluetooth::Uuid& uuid,
std::unique_ptr<bluetooth::BluetoothInstance> instance) {
VLOG(2) << __func__ << " - status: " << status;
// Simply remove the callback from |pending_callbacks_| as it no longer
// belongs in there.
sp<IInterface> callback = pending_callbacks_.Remove(uuid);
// |callback| might be NULL if it was removed from the pending list, e.g. the
// remote process that owns the callback died.
if (!callback.get()) {
VLOG(1) << "Callback was removed before the call to \"RegisterInstance\" "
<< "returned; unregistering instance";
return;
}
if (status != bluetooth::BLE_STATUS_SUCCESS) {
// The call wasn't successful. Notify the implementation and return.
LOG(ERROR) << "Failed to register instance: " << status;
OnRegisterInstanceImpl(status, callback, nullptr);
return;
}
std::lock_guard<std::mutex> lock(maps_lock_);
int instance_id = instance->GetInstanceId();
if (!id_to_cb_.Register(instance_id, callback, this)) {
LOG(ERROR) << "Failed to store callback";
OnRegisterInstanceImpl(bluetooth::BLE_STATUS_FAILURE, callback, nullptr);
return;
}
VLOG(1) << "Registered BluetoothInstance - ID: " << instance_id;
auto shared_instance =
std::shared_ptr<bluetooth::BluetoothInstance>(instance.release());
id_to_instance_[instance_id] = shared_instance;
OnRegisterInstanceImpl(status, callback, shared_instance.get());
}
void InterfaceWithInstancesBase::OnRemoteCallbackRemoved(const int& key) {
VLOG(2) << __func__ << " instance_id: " << key;
std::lock_guard<std::mutex> lock(maps_lock_);
// No need to remove from the callback map as the entry should be already
// removed when this callback gets called.
id_to_instance_.erase(key);
}
} // namespace binder
} // namespace ipc
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