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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      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 package com.android.tradefed.device;
     17 
     18 import java.util.LinkedList;
     19 import java.util.List;
     20 
     21 /**
     22  * A proxy class to propagate requests to multiple {@link IDeviceMonitor}s.
     23  */
     24 public class DeviceMonitorMultiplexer implements IDeviceMonitor {
     25 
     26     private final List<IDeviceMonitor> mDeviceMonitors;
     27 
     28     public DeviceMonitorMultiplexer() {
     29         mDeviceMonitors = new LinkedList<>();
     30     }
     31 
     32     /**
     33      * {@inheritDoc}
     34      */
     35     @Override
     36     public synchronized void run() {
     37         for (IDeviceMonitor monitor : mDeviceMonitors) {
     38             monitor.run();
     39         }
     40     }
     41 
     42     /**
     43      * {@inheritDoc}
     44      */
     45     @Override
     46     public synchronized void setDeviceLister(DeviceLister lister) {
     47         for (IDeviceMonitor monitor : mDeviceMonitors) {
     48             monitor.setDeviceLister(lister);
     49         }
     50     }
     51 
     52     /**
     53      * {@inheritDoc}
     54      */
     55     @Override
     56     public synchronized void notifyDeviceStateChange(String serial, DeviceAllocationState oldState,
     57             DeviceAllocationState newState) {
     58         for (IDeviceMonitor monitor : mDeviceMonitors) {
     59             monitor.notifyDeviceStateChange(serial, oldState, newState);
     60         }
     61     }
     62 
     63     public synchronized void addMonitors(List<IDeviceMonitor> globalDeviceMonitors) {
     64         mDeviceMonitors.addAll(globalDeviceMonitors);
     65     }
     66 
     67     public synchronized void addMonitor(IDeviceMonitor globalDeviceMonitor) {
     68         mDeviceMonitors.add(globalDeviceMonitor);
     69     }
     70 
     71     public synchronized void removeMonitor(IDeviceMonitor mon) {
     72         mDeviceMonitors.remove(mon);
     73     }
     74 
     75     @Override
     76     public synchronized void stop() {
     77         for (IDeviceMonitor monitor : mDeviceMonitors) {
     78             monitor.stop();
     79         }
     80     }
     81 }
     82