git.basschouten.com Git - openhab-addons.git/blob

   1 /**
   2  * Copyright (c) 2010-2023 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     @SuppressWarnings("PMD.CompareObjectsWithEquals")
  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     @SuppressWarnings("PMD.CompareObjectsWithEquals")
 108     private class Listener implements BluetoothDeviceListener {
 109
 110         private BluetoothDevice device;
 111
 112         public Listener(BluetoothDevice device) {
 113             this.device = device;
 114         }
 115
 116         @Override
 117         public void onScanRecordReceived(BluetoothScanNotification scanNotification) {
 118             if (device == getDelegate()) {
 119                 notifyListeners(BluetoothEventType.SCAN_RECORD, scanNotification);
 120             }
 121         }
 122
 123         @Override
 124         public void onConnectionStateChange(BluetoothConnectionStatusNotification connectionNotification) {
 125             if (device == getDelegate()) {
 126                 notifyListeners(BluetoothEventType.CONNECTION_STATE, connectionNotification);
 127             }
 128         }
 129
 130         @Override
 131         public void onServicesDiscovered() {
 132             device.getServices().forEach(RoamingBluetoothDevice.this::addService);
 133             if (device == getDelegate()) {
 134                 notifyListeners(BluetoothEventType.SERVICES_DISCOVERED);
 135             }
 136         }
 137
 138         @Override
 139         public void onCharacteristicUpdate(BluetoothCharacteristic characteristic, byte[] value) {
 140             if (device == getDelegate()) {
 141                 notifyListeners(BluetoothEventType.CHARACTERISTIC_UPDATED, characteristic, value);
 142             }
 143         }
 144
 145         @Override
 146         public void onDescriptorUpdate(BluetoothDescriptor bluetoothDescriptor, byte[] value) {
 147             if (device == getDelegate()) {
 148                 notifyListeners(BluetoothEventType.DESCRIPTOR_UPDATED, bluetoothDescriptor, value);
 149             }
 150         }
 151
 152         @Override
 153         public void onAdapterChanged(BluetoothAdapter adapter) {
 154             // do nothing since we are the ones that are supposed to trigger this
 155         }
 156     }
 157 }