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/**
* BlueCove - Java library for Bluetooth
* Copyright (C) 2008-2009 Michael Lifshits
* Copyright (C) 2008-2009 Vlad Skarzhevskyy
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
* @author vlads
* @version $Id$
*/
package com.intel.bluetooth;

import java.util.Random;
import java.util.Vector;

import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.RemoteDevice;

import com.intel.bluetooth.emu.DeviceDescriptor;

/**
*
*/
class EmulatorDeviceInquiry implements DeviceInquiryRunnable {

private static final int DISCOVERY_DURATION_ALWAYS = 200;

private static final int DISCOVERY_DURATION_MINIMUM = 500;

private EmulatorLocalDevice localDevice;

private BluetoothStack bluetoothStack;

private DiscoveryListener discoveryListener;

private boolean deviceInquiryCanceled = false;

private Object canceledEvent = new Object();

private static Random rnd;

EmulatorDeviceInquiry(EmulatorLocalDevice localDevice, BluetoothStack bluetoothStack,
DiscoveryListener discoveryListener) {
this.localDevice = localDevice;
this.bluetoothStack = bluetoothStack;
this.discoveryListener = discoveryListener;
}

/*
* (non-Javadoc)
*
* @see com.intel.bluetooth.DeviceInquiryRunnable#runDeviceInquiry(com.intel.bluetooth.DeviceInquiryThread, int,
* javax.bluetooth.DiscoveryListener)
*/
public int runDeviceInquiry(DeviceInquiryThread startedNotify, int accessCode, DiscoveryListener listener)
throws BluetoothStateException {
try {
DeviceDescriptor[] devices = localDevice.getDeviceManagerService().getDiscoveredDevices(
localDevice.getAddress());
startedNotify.deviceInquiryStartedCallback();
long start = System.currentTimeMillis();
// Find first device
while (devices.length == 0) {
if (!randomWait(start, -1)) {
break;
}
devices = updateDiscoveredDevices(devices);
}
// Report devices and find a new one
int reportedIndex = 0;
while ((randomWait(start, reportedIndex)) || (reportedIndex < devices.length)) {
if (deviceInquiryCanceled) {
return DiscoveryListener.INQUIRY_TERMINATED;
}
if (reportedIndex < devices.length) {
DeviceDescriptor d = devices[reportedIndex];
// Device may be updated.
d = localDevice.getDeviceManagerService().getDeviceDescriptor(d.getAddress());
reportedIndex++;
RemoteDevice remoteDevice = RemoteDeviceHelper.createRemoteDevice(bluetoothStack, d.getAddress(), d
.getName(), false);
DeviceClass cod = new DeviceClass(d.getDeviceClass());
DebugLog.debug("deviceDiscovered address", remoteDevice.getBluetoothAddress());
DebugLog.debug("deviceDiscovered deviceClass", cod);
listener.deviceDiscovered(remoteDevice, cod);
}
devices = updateDiscoveredDevices(devices);
}

if (deviceInquiryCanceled) {
return DiscoveryListener.INQUIRY_TERMINATED;
}
return DiscoveryListener.INQUIRY_COMPLETED;
} finally {
bluetoothStack.cancelInquiry(discoveryListener);
}
}

private DeviceDescriptor[] updateDiscoveredDevices(DeviceDescriptor[] devices) {
DeviceDescriptor[] newDevices = localDevice.getDeviceManagerService().getDiscoveredDevices(
localDevice.getAddress());
Vector<DeviceDescriptor> discoveredDevice = new Vector<DeviceDescriptor>();
// Old device unchanged
for (int i = 0; i < devices.length; i++) {
discoveredDevice.addElement(devices[i]);
}
// Append new devices if any
newDevicesLoop: for (int i = 0; i < newDevices.length; i++) {
for (int k = 0; k < devices.length; k++) {
if (newDevices[i].getAddress() == devices[k].getAddress()) {
continue newDevicesLoop;
}
}
discoveredDevice.addElement(newDevices[i]);
}
return (DeviceDescriptor[]) discoveredDevice.toArray(new DeviceDescriptor[discoveredDevice.size()]);
}

private boolean randomWait(long start, int device) {
long duration = localDevice.getConfiguration().getDeviceInquiryDuration() * 1000;
if (duration <= 0) {
duration = DISCOVERY_DURATION_MINIMUM;
}
long now = System.currentTimeMillis();
if ((duration == 0) || (now > start + duration)) {
return false;
}
long timeout = duration / 7;
if (localDevice.getConfiguration().isDeviceInquiryRandomDelay()) {
if (rnd == null) {
rnd = new Random();
}
long timeleft = start + duration - now;
if (timeleft > 0) {
timeout = rnd.nextInt((int) timeleft);
}
}
if (device == 0) {
timeout += DISCOVERY_DURATION_ALWAYS;
}

// Limit wait till the end of the duration period
if (now + timeout > start + duration) {
timeout = start + duration - now;
}
if (timeout <= 0) {
return true;
}
synchronized (canceledEvent) {
try {
canceledEvent.wait(timeout);
} catch (InterruptedException e) {
deviceInquiryCanceled = true;
}
}
return true;
}

boolean cancelInquiry(DiscoveryListener listener) {
if (discoveryListener != listener) {
return false;
}
deviceInquiryCanceled = true;
synchronized (canceledEvent) {
canceledEvent.notifyAll();
}
return true;
}

/*
* (non-Javadoc)
*
* @see com.intel.bluetooth.DeviceInquiryRunnable#deviceDiscoveredCallback(javax.bluetooth.DiscoveryListener, long,
* int, java.lang.String, boolean)
*/
public void deviceDiscoveredCallback(DiscoveryListener listener, long deviceAddr, int deviceClass,
String deviceName, boolean paired) {
}

}

Change log

r2917 by skarzhevskyy on Mar 13, 2009   Diff
Updated javadocs and Copyright
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Older revisions

r2536 by skarzhevskyy on Dec 9, 2008   Diff
Corrections to Emulator DeviceInquiry;
DISCOVERY_DURATION_ALWAYS = 200
r2534 by skarzhevskyy on Dec 9, 2008   Diff
Corrections to Emulator DeviceInquiry
r2471 by skarzhevskyy on Nov 30, 2008   Diff
Change license to Apache License,
Version 2.0, Update headers
All revisions of this file

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