| /** |
| * 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 ( |
| "fmt" |
| "time" |
| |
| "mynewt.apache.org/newtmgr/nmxact/nmxutil" |
| ) |
| |
| type ListenerKey struct { |
| // seq-key only. |
| Seq BleSeq |
| |
| // tch-key only (type-conn-handle). |
| Type MsgType |
| ConnHandle int |
| } |
| |
| // Listener that matches by sequence number. |
| func SeqKey(seq BleSeq) ListenerKey { |
| return ListenerKey{ |
| Seq: seq, |
| Type: -1, |
| ConnHandle: -1, |
| } |
| } |
| |
| // Listener that matches by TCH (type and conn-handle). |
| func TchKey(typ MsgType, connHandle int) ListenerKey { |
| return ListenerKey{ |
| Seq: BLE_SEQ_NONE, |
| Type: typ, |
| ConnHandle: connHandle, |
| } |
| } |
| |
| type Listener struct { |
| MsgChan chan Msg |
| ErrChan chan error |
| TmoChan chan time.Time |
| Acked bool |
| |
| timer *time.Timer |
| } |
| |
| func NewListener() *Listener { |
| return &Listener{ |
| MsgChan: make(chan Msg, 16), |
| ErrChan: make(chan error, 1), |
| TmoChan: make(chan time.Time, 1), |
| } |
| } |
| |
| func (bl *Listener) AfterTimeout(tmo time.Duration) <-chan time.Time { |
| fn := func() { |
| if !bl.Acked { |
| bl.TmoChan <- time.Now() |
| } |
| } |
| bl.timer = time.AfterFunc(tmo, fn) |
| return bl.TmoChan |
| } |
| |
| func (bl *Listener) Close() { |
| // This provokes a race condition. The timer may get initialized at any |
| // time. |
| if bl.timer != nil { |
| bl.timer.Stop() |
| } |
| |
| // Mark the command as acked in case the race condition mentioned above |
| // occurred. If the timer goes off, nothing will happen. |
| bl.Acked = true |
| |
| close(bl.MsgChan) |
| for { |
| if _, ok := <-bl.MsgChan; !ok { |
| break |
| } |
| } |
| |
| close(bl.ErrChan) |
| for { |
| if _, ok := <-bl.ErrChan; !ok { |
| break |
| } |
| } |
| |
| close(bl.TmoChan) |
| for { |
| if _, ok := <-bl.TmoChan; !ok { |
| break |
| } |
| } |
| } |
| |
| // Not thread safe. |
| type ListenerMap struct { |
| k2l map[ListenerKey]*Listener |
| l2k map[*Listener]ListenerKey |
| } |
| |
| func NewListenerMap() *ListenerMap { |
| return &ListenerMap{ |
| k2l: map[ListenerKey]*Listener{}, |
| l2k: map[*Listener]ListenerKey{}, |
| } |
| } |
| |
| func (lm *ListenerMap) FindListener(seq BleSeq, typ MsgType, connHandle int) ( |
| ListenerKey, *Listener) { |
| |
| var key ListenerKey |
| |
| // First, find by sequence number. |
| key = SeqKey(seq) |
| if listener := lm.k2l[key]; listener != nil { |
| return key, listener |
| } |
| |
| // Otherwise, find by other fields. |
| key = TchKey(typ, connHandle) |
| if listener := lm.k2l[key]; listener != nil { |
| return key, listener |
| } |
| key = TchKey(typ, -1) |
| if listener := lm.k2l[key]; listener != nil { |
| return key, listener |
| } |
| |
| return key, nil |
| } |
| |
| func (lm *ListenerMap) AddListener(key ListenerKey, listener *Listener) error { |
| if _, ok := lm.k2l[key]; ok { |
| nmxutil.Assert(false) |
| return fmt.Errorf("Duplicate BLE listener: %#v", key) |
| } |
| |
| if _, ok := lm.l2k[listener]; ok { |
| nmxutil.Assert(false) |
| return fmt.Errorf("Duplicate BLE listener: %#v", key) |
| } |
| |
| lm.k2l[key] = listener |
| lm.l2k[listener] = key |
| |
| return nil |
| } |
| |
| func (lm *ListenerMap) deleteListener(key ListenerKey, listener *Listener) { |
| nmxutil.Assert(lm.k2l[key] == listener) |
| nmxutil.Assert(lm.l2k[listener] == key) |
| delete(lm.k2l, key) |
| delete(lm.l2k, listener) |
| } |
| |
| func (lm *ListenerMap) RemoveListener(listener *Listener) *ListenerKey { |
| key, ok := lm.l2k[listener] |
| if !ok { |
| return nil |
| } |
| |
| lm.deleteListener(key, listener) |
| return &key |
| } |
| |
| func (lm *ListenerMap) RemoveKey(key ListenerKey) *Listener { |
| listener := lm.k2l[key] |
| if listener == nil { |
| return nil |
| } |
| |
| lm.deleteListener(key, listener) |
| return listener |
| } |
| |
| func (lm *ListenerMap) ExtractAll() []*Listener { |
| listeners := make([]*Listener, 0, len(lm.l2k)) |
| |
| for listener, _ := range lm.l2k { |
| listeners = append(listeners, listener) |
| } |
| |
| lm.k2l = map[ListenerKey]*Listener{} |
| lm.l2k = map[*Listener]ListenerKey{} |
| |
| return listeners |
| } |