| /** |
| * 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 nmxutil |
| |
| import ( |
| "sync" |
| ) |
| |
| type Bcaster struct { |
| chs [](chan interface{}) |
| mtx sync.Mutex |
| } |
| |
| func (b *Bcaster) clearNoLock() { |
| for _, ch := range b.chs { |
| close(ch) |
| } |
| |
| b.chs = nil |
| } |
| |
| func (b *Bcaster) copyChansNoLock() []chan interface{} { |
| chans := make([]chan interface{}, len(b.chs)) |
| for i, _ := range b.chs { |
| chans[i] = b.chs[i] |
| } |
| |
| return chans |
| } |
| |
| func (b *Bcaster) sendNoLock(val interface{}) { |
| for _, ch := range b.copyChansNoLock() { |
| ch <- val |
| } |
| } |
| |
| func (b *Bcaster) Listen(depth int) chan interface{} { |
| b.mtx.Lock() |
| defer b.mtx.Unlock() |
| |
| ch := make(chan interface{}, depth) |
| b.chs = append(b.chs, ch) |
| |
| return ch |
| } |
| |
| func (b *Bcaster) copyChans() []chan interface{} { |
| b.mtx.Lock() |
| defer b.mtx.Unlock() |
| |
| return b.copyChansNoLock() |
| } |
| |
| func (b *Bcaster) Send(val interface{}) { |
| for _, ch := range b.copyChans() { |
| ch <- val |
| } |
| } |
| |
| func (b *Bcaster) StopListening(ch chan interface{}) { |
| b.mtx.Lock() |
| defer b.mtx.Unlock() |
| |
| for i, c := range b.chs { |
| if c == ch { |
| close(c) |
| |
| b.chs[i] = b.chs[len(b.chs)-1] |
| b.chs = b.chs[:len(b.chs)-1] |
| break |
| } |
| } |
| } |
| |
| func (b *Bcaster) Clear() { |
| b.mtx.Lock() |
| defer b.mtx.Unlock() |
| |
| b.clearNoLock() |
| } |
| |
| func (b *Bcaster) SendAndClear(val interface{}) { |
| b.mtx.Lock() |
| defer b.mtx.Unlock() |
| |
| b.sendNoLock(val) |
| b.clearNoLock() |
| } |