| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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. |
| */ |
| package com.android.tradefed.command.remote; |
| |
| import com.android.tradefed.device.ITestDevice; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Hashtable; |
| import java.util.Map; |
| |
| /** |
| * Singleton class that tracks devices that have been remotely allocated. |
| */ |
| class DeviceTracker { |
| |
| /** |
| * Use on demand holder idiom |
| * @see http://en.wikipedia.org/wiki/Singleton_pattern#The_solution_of_Bill_Pugh |
| */ |
| private static class SingletonHolder { |
| public static final DeviceTracker cInstance = new DeviceTracker(); |
| } |
| |
| public static DeviceTracker getInstance() { |
| return SingletonHolder.cInstance; |
| } |
| |
| // private constructor - don't allow instantiation |
| private DeviceTracker() { |
| } |
| |
| // use Hashtable since its thread-safe |
| private Map<String, ITestDevice> mAllocatedDeviceMap = new Hashtable<String, ITestDevice>(); |
| |
| /** |
| * Mark given device as remotely allocated. |
| */ |
| public void allocateDevice(ITestDevice d) { |
| mAllocatedDeviceMap.put(d.getSerialNumber(), d); |
| } |
| |
| /** |
| * Mark given device serial as freed. |
| * |
| * @return the corresponding {@link ITestDevice} or <code>null</code> if device with given |
| * serial cannot be found |
| */ |
| public ITestDevice freeDevice(String serial) { |
| return mAllocatedDeviceMap.remove(serial); |
| } |
| |
| /** |
| * Mark all remotely allocated devices as freed. |
| * |
| * @return a {@link Collection} of all remotely allocated devices |
| */ |
| public Collection<ITestDevice> freeAll() { |
| Collection<ITestDevice> devices = new ArrayList<ITestDevice>(mAllocatedDeviceMap.values()); |
| mAllocatedDeviceMap.clear(); |
| return devices; |
| } |
| } |