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   1 /**
   2  * Copyright (c) 2010-2020 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.BluetoothCompletionStatus;
  29 import org.openhab.binding.bluetooth.BluetoothDescriptor;
  30 import org.openhab.binding.bluetooth.BluetoothDevice;
  31 import org.openhab.binding.bluetooth.BluetoothDeviceListener;
  32 import org.openhab.binding.bluetooth.DelegateBluetoothDevice;
  33 import org.openhab.binding.bluetooth.notification.BluetoothConnectionStatusNotification;
  34 import org.openhab.binding.bluetooth.notification.BluetoothScanNotification;
  35
  36 /**
  37  * The {@link RoamingBluetoothDevice} acts as a roaming device by delegating
  38  * its operations to actual adapters.
  39  *
  40  * @author Connor Petty - Initial contribution
  41  */
  42 @NonNullByDefault
  43 public class RoamingBluetoothDevice extends DelegateBluetoothDevice {
  44
  45     private final Map<BluetoothDevice, Listener> devices = new ConcurrentHashMap<>();
  46
  47     private final List<BluetoothDeviceListener> eventListeners = new CopyOnWriteArrayList<>();
  48
  49     private final AtomicReference<@Nullable BluetoothDevice> currentDelegateRef = new AtomicReference<>();
  50
  51     protected RoamingBluetoothDevice(RoamingBridgeHandler roamingAdapter, BluetoothAddress address) {
  52         super(roamingAdapter, address);
  53     }
  54
  55     public void addBluetoothDevice(BluetoothDevice device) {
  56         device.addListener(Objects.requireNonNull(devices.computeIfAbsent(device, Listener::new)));
  57     }
  58
  59     public void removeBluetoothDevice(BluetoothDevice device) {
  60         BluetoothDeviceListener listener = devices.remove(device);
  61         if (listener != null) {
  62             device.removeListener(listener);
  63         }
  64     }
  65
  66     @Override
  67     protected Collection<BluetoothDeviceListener> getListeners() {
  68         return eventListeners;
  69     }
  70
  71     @Override
  72     protected @Nullable BluetoothDevice getDelegate() {
  73         BluetoothDevice newDelegate = null;
  74         int newRssi = Integer.MIN_VALUE;
  75         for (BluetoothDevice device : devices.keySet()) {
  76             ConnectionState state = device.getConnectionState();
  77             if (state == ConnectionState.CONNECTING || state == ConnectionState.CONNECTED) {
  78                 newDelegate = device;
  79                 break;
  80             }
  81             Integer rssi = device.getRssi();
  82             if (rssi != null && (newDelegate == null || rssi > newRssi)) {
  83                 newRssi = rssi;
  84                 newDelegate = device;
  85             }
  86         }
  87         BluetoothDevice oldDelegate = currentDelegateRef.getAndSet(newDelegate);
  88         if (oldDelegate != newDelegate) { // using reference comparison is valid in this case
  89             notifyListeners(BluetoothEventType.ADAPTER_CHANGED, getAdapter(newDelegate));
  90         }
  91         return newDelegate;
  92     }
  93
  94     private BluetoothAdapter getAdapter(@Nullable BluetoothDevice delegate) {
  95         if (delegate != null) {
  96             return delegate.getAdapter();
  97         }
  98         // as a last resort we return our "actual" adapter
  99         return super.getAdapter();
 100     }
 101
 102     @Override
 103     public BluetoothAdapter getAdapter() {
 104         return getAdapter(currentDelegateRef.get());
 105     }
 106
 107     private class Listener implements BluetoothDeviceListener {
 108
 109         private BluetoothDevice device;
 110
 111         public Listener(BluetoothDevice device) {
 112             this.device = device;
 113         }
 114
 115         @Override
 116         public void onScanRecordReceived(BluetoothScanNotification scanNotification) {
 117             if (device == getDelegate()) {
 118                 notifyListeners(BluetoothEventType.SCAN_RECORD, scanNotification);
 119             }
 120         }
 121
 122         @Override
 123         public void onConnectionStateChange(BluetoothConnectionStatusNotification connectionNotification) {
 124             if (device == getDelegate()) {
 125                 notifyListeners(BluetoothEventType.CONNECTION_STATE, connectionNotification);
 126             }
 127         }
 128
 129         @Override
 130         public void onServicesDiscovered() {
 131             device.getServices().forEach(RoamingBluetoothDevice.this::addService);
 132             if (device == getDelegate()) {
 133                 notifyListeners(BluetoothEventType.SERVICES_DISCOVERED);
 134             }
 135         }
 136
 137         @Override
 138         public void onCharacteristicReadComplete(BluetoothCharacteristic characteristic,
 139                 BluetoothCompletionStatus status) {
 140             if (device == getDelegate()) {
 141                 notifyListeners(BluetoothEventType.CHARACTERISTIC_READ_COMPLETE, characteristic, status);
 142             }
 143         }
 144
 145         @Override
 146         public void onCharacteristicWriteComplete(BluetoothCharacteristic characteristic,
 147                 BluetoothCompletionStatus status) {
 148             if (device == getDelegate()) {
 149                 notifyListeners(BluetoothEventType.CHARACTERISTIC_WRITE_COMPLETE, characteristic);
 150             }
 151         }
 152
 153         @Override
 154         public void onCharacteristicUpdate(BluetoothCharacteristic characteristic) {
 155             if (device == getDelegate()) {
 156                 notifyListeners(BluetoothEventType.CHARACTERISTIC_UPDATED, characteristic);
 157             }
 158         }
 159
 160         @Override
 161         public void onDescriptorUpdate(BluetoothDescriptor bluetoothDescriptor) {
 162             if (device == getDelegate()) {
 163                 notifyListeners(BluetoothEventType.DESCRIPTOR_UPDATED, bluetoothDescriptor);
 164             }
 165         }
 166
 167         @Override
 168         public void onAdapterChanged(BluetoothAdapter adapter) {
 169             // do nothing since we are the ones that are supposed to trigger this
 170         }
 171     }
 172 }