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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.bluetooth.roaming.internal;
  14
  15 import java.util.Collection;
  16 import java.util.List;
  17 import java.util.Map;
  18 import java.util.Objects;
  19 import java.util.concurrent.ConcurrentHashMap;
  20 import java.util.concurrent.CopyOnWriteArrayList;
  21 import java.util.concurrent.atomic.AtomicReference;
  22
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.eclipse.jdt.annotation.Nullable;
  25 import org.openhab.binding.bluetooth.BluetoothAdapter;
  26 import org.openhab.binding.bluetooth.BluetoothAddress;
  27 import org.openhab.binding.bluetooth.BluetoothCharacteristic;
  28 import org.openhab.binding.bluetooth.BluetoothDescriptor;
  29 import org.openhab.binding.bluetooth.BluetoothDevice;
  30 import org.openhab.binding.bluetooth.BluetoothDeviceListener;
  31 import org.openhab.binding.bluetooth.DelegateBluetoothDevice;
  32 import org.openhab.binding.bluetooth.notification.BluetoothConnectionStatusNotification;
  33 import org.openhab.binding.bluetooth.notification.BluetoothScanNotification;
  34
  35 /**
  36  * The {@link RoamingBluetoothDevice} acts as a roaming device by delegating
  37  * its operations to actual adapters.
  38  *
  39  * @author Connor Petty - Initial contribution
  40  */
  41 @NonNullByDefault
  42 public class RoamingBluetoothDevice extends DelegateBluetoothDevice {
  43
  44     private final Map<BluetoothDevice, Listener> devices = new ConcurrentHashMap<>();
  45
  46     private final List<BluetoothDeviceListener> eventListeners = new CopyOnWriteArrayList<>();
  47
  48     private final AtomicReference<@Nullable BluetoothDevice> currentDelegateRef = new AtomicReference<>();
  49
  50     protected RoamingBluetoothDevice(RoamingBridgeHandler roamingAdapter, BluetoothAddress address) {
  51         super(roamingAdapter, address);
  52     }
  53
  54     public void addBluetoothDevice(BluetoothDevice device) {
  55         device.addListener(Objects.requireNonNull(devices.computeIfAbsent(device, Listener::new)));
  56     }
  57
  58     public void removeBluetoothDevice(BluetoothDevice device) {
  59         BluetoothDeviceListener listener = devices.remove(device);
  60         if (listener != null) {
  61             device.removeListener(listener);
  62         }
  63     }
  64
  65     @Override
  66     protected Collection<BluetoothDeviceListener> getListeners() {
  67         return eventListeners;
  68     }
  69
  70     @Override
  71     protected @Nullable BluetoothDevice getDelegate() {
  72         BluetoothDevice newDelegate = null;
  73         int newRssi = Integer.MIN_VALUE;
  74         for (BluetoothDevice device : devices.keySet()) {
  75             ConnectionState state = device.getConnectionState();
  76             if (state == ConnectionState.CONNECTING || state == ConnectionState.CONNECTED) {
  77                 newDelegate = device;
  78                 break;
  79             }
  80             Integer rssi = device.getRssi();
  81             if (rssi != null && (newDelegate == null || rssi > newRssi)) {
  82                 newRssi = rssi;
  83                 newDelegate = device;
  84             }
  85         }
  86         BluetoothDevice oldDelegate = currentDelegateRef.getAndSet(newDelegate);
  87         if (oldDelegate != newDelegate) { // using reference comparison is valid in this case
  88             notifyListeners(BluetoothEventType.ADAPTER_CHANGED, getAdapter(newDelegate));
  89         }
  90         return newDelegate;
  91     }
  92
  93     private BluetoothAdapter getAdapter(@Nullable BluetoothDevice delegate) {
  94         if (delegate != null) {
  95             return delegate.getAdapter();
  96         }
  97         // as a last resort we return our "actual" adapter
  98         return super.getAdapter();
  99     }
 100
 101     @Override
 102     public BluetoothAdapter getAdapter() {
 103         return getAdapter(currentDelegateRef.get());
 104     }
 105
 106     private class Listener implements BluetoothDeviceListener {
 107
 108         private BluetoothDevice device;
 109
 110         public Listener(BluetoothDevice device) {
 111             this.device = device;
 112         }
 113
 114         @Override
 115         public void onScanRecordReceived(BluetoothScanNotification scanNotification) {
 116             if (device == getDelegate()) {
 117                 notifyListeners(BluetoothEventType.SCAN_RECORD, scanNotification);
 118             }
 119         }
 120
 121         @Override
 122         public void onConnectionStateChange(BluetoothConnectionStatusNotification connectionNotification) {
 123             if (device == getDelegate()) {
 124                 notifyListeners(BluetoothEventType.CONNECTION_STATE, connectionNotification);
 125             }
 126         }
 127
 128         @Override
 129         public void onServicesDiscovered() {
 130             device.getServices().forEach(RoamingBluetoothDevice.this::addService);
 131             if (device == getDelegate()) {
 132                 notifyListeners(BluetoothEventType.SERVICES_DISCOVERED);
 133             }
 134         }
 135
 136         @Override
 137         public void onCharacteristicUpdate(BluetoothCharacteristic characteristic, byte[] value) {
 138             if (device == getDelegate()) {
 139                 notifyListeners(BluetoothEventType.CHARACTERISTIC_UPDATED, characteristic, value);
 140             }
 141         }
 142
 143         @Override
 144         public void onDescriptorUpdate(BluetoothDescriptor bluetoothDescriptor, byte[] value) {
 145             if (device == getDelegate()) {
 146                 notifyListeners(BluetoothEventType.DESCRIPTOR_UPDATED, bluetoothDescriptor, value);
 147             }
 148         }
 149
 150         @Override
 151         public void onAdapterChanged(BluetoothAdapter adapter) {
 152             // do nothing since we are the ones that are supposed to trigger this
 153         }
 154     }
 155 }