| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package nmble |
| |
| import ( |
| "sync" |
| |
| "mynewt.apache.org/newtmgr/nmxact/nmxutil" |
| ) |
| |
| // The receiver never writes to any of its listeners. It only maintains a set |
| // of listeners so that their lifetimes can be tracked and to facilitate their |
| // removal from the BLE transport. |
| |
| type Receiver struct { |
| id uint32 |
| bx *BleXport |
| lm *ListenerMap |
| logDepth int |
| mtx sync.Mutex |
| wg sync.WaitGroup |
| } |
| |
| func NewReceiver(id uint32, bx *BleXport, logDepth int) *Receiver { |
| return &Receiver{ |
| id: id, |
| bx: bx, |
| logDepth: logDepth + 3, |
| lm: NewListenerMap(), |
| } |
| } |
| |
| func (r *Receiver) AddListener(name string, key ListenerKey) ( |
| *Listener, error) { |
| |
| nmxutil.LogAddListener(r.logDepth, key, r.id, name) |
| |
| r.mtx.Lock() |
| defer r.mtx.Unlock() |
| |
| bl, err := r.bx.AddListener(key) |
| if err != nil { |
| return nil, err |
| } |
| |
| r.lm.AddListener(key, bl) |
| r.wg.Add(1) |
| |
| return bl, nil |
| } |
| |
| func (r *Receiver) RemoveKey(name string, key ListenerKey) *Listener { |
| r.mtx.Lock() |
| defer r.mtx.Unlock() |
| |
| r.bx.RemoveKey(key) |
| bl := r.lm.RemoveKey(key) |
| if bl == nil { |
| return nil |
| } |
| |
| nmxutil.LogRemoveListener(r.logDepth, key, r.id, name) |
| r.wg.Done() |
| return bl |
| } |
| |
| func (r *Receiver) RemoveListener(name string, listener *Listener) *ListenerKey { |
| r.mtx.Lock() |
| defer r.mtx.Unlock() |
| |
| r.bx.RemoveListener(listener) |
| key := r.lm.RemoveListener(listener) |
| if key == nil { |
| return nil |
| } |
| |
| nmxutil.LogRemoveListener(r.logDepth, key, r.id, name) |
| r.wg.Done() |
| return key |
| } |
| |
| func (r *Receiver) RemoveAll(name string) { |
| r.mtx.Lock() |
| bls := r.lm.ExtractAll() |
| r.mtx.Unlock() |
| |
| for _, bl := range bls { |
| if key := r.bx.RemoveListener(bl); key != nil { |
| nmxutil.LogRemoveListener(r.logDepth, key, r.id, name) |
| } |
| r.wg.Done() |
| } |
| } |
| |
| func (r *Receiver) WaitUntilNoListeners() { |
| r.wg.Wait() |
| } |