| /* |
| * Copyright (C) 2009 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 android.bluetooth; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| /** |
| * A connected or connecting Bluetooth socket. |
| * |
| * <p>The interface for Bluetooth Sockets is similar to that of TCP sockets: |
| * {@link java.net.Socket} and {@link java.net.ServerSocket}. On the server |
| * side, use a {@link BluetoothServerSocket} to create a listening server |
| * socket. It will return a new, connected {@link BluetoothSocket} on an |
| * accepted connection. On the client side, use the same |
| * {@link BluetoothSocket} object to both intiate the outgoing connection, |
| * and to manage the connected socket. |
| * |
| * <p>The most common type of Bluetooth Socket is RFCOMM. RFCOMM is a |
| * connection orientated, streaming transport over Bluetooth. It is also known |
| * as the Serial Port Profile (SPP). |
| * |
| * <p>Use {@link BluetoothDevice#createRfcommSocket} to create a new {@link |
| * BluetoothSocket} ready for an outgoing connection to a remote |
| * {@link BluetoothDevice}. |
| * |
| * <p>Use {@link BluetoothAdapter#listenUsingRfcommOn} to create a listening |
| * {@link BluetoothServerSocket} ready for incoming connections to the local |
| * {@link BluetoothAdapter}. |
| * |
| * <p>{@link BluetoothSocket} and {@link BluetoothServerSocket} are thread |
| * safe. In particular, {@link #close} will always immediately abort ongoing |
| * operations and close the socket. |
| * |
| * <p>All methods on a {@link BluetoothSocket} require |
| * {@link android.Manifest.permission#BLUETOOTH} |
| */ |
| public final class BluetoothSocket implements Closeable { |
| /** Keep TYPE_ fields in sync with BluetoothSocket.cpp */ |
| /*package*/ static final int TYPE_RFCOMM = 1; |
| /*package*/ static final int TYPE_SCO = 2; |
| /*package*/ static final int TYPE_L2CAP = 3; |
| |
| private final int mType; /* one of TYPE_RFCOMM etc */ |
| private final int mPort; /* RFCOMM channel or L2CAP psm */ |
| private final BluetoothDevice mDevice; /* remote device */ |
| private final String mAddress; /* remote address */ |
| private final boolean mAuth; |
| private final boolean mEncrypt; |
| private final BluetoothInputStream mInputStream; |
| private final BluetoothOutputStream mOutputStream; |
| |
| /** prevents all native calls after destroyNative() */ |
| private boolean mClosed; |
| |
| /** protects mClosed */ |
| private final ReentrantReadWriteLock mLock; |
| |
| /** used by native code only */ |
| private int mSocketData; |
| |
| /** |
| * Construct a BluetoothSocket. |
| * @param type type of socket |
| * @param fd fd to use for connected socket, or -1 for a new socket |
| * @param auth require the remote device to be authenticated |
| * @param encrypt require the connection to be encrypted |
| * @param device remote device that this socket can connect to |
| * @param port remote port |
| * @throws IOException On error, for example Bluetooth not available, or |
| * insufficient priveleges |
| */ |
| /*package*/ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, |
| BluetoothDevice device, int port) throws IOException { |
| mType = type; |
| mAuth = auth; |
| mEncrypt = encrypt; |
| mDevice = device; |
| if (device == null) { |
| mAddress = null; |
| } else { |
| mAddress = device.getAddress(); |
| } |
| mPort = port; |
| if (fd == -1) { |
| initSocketNative(); |
| } else { |
| initSocketFromFdNative(fd); |
| } |
| mInputStream = new BluetoothInputStream(this); |
| mOutputStream = new BluetoothOutputStream(this); |
| mClosed = false; |
| mLock = new ReentrantReadWriteLock(); |
| } |
| |
| /** |
| * Construct a BluetoothSocket from address. |
| * @param type type of socket |
| * @param fd fd to use for connected socket, or -1 for a new socket |
| * @param auth require the remote device to be authenticated |
| * @param encrypt require the connection to be encrypted |
| * @param address remote device that this socket can connect to |
| * @param port remote port |
| * @throws IOException On error, for example Bluetooth not available, or |
| * insufficient priveleges |
| */ |
| private BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, String address, |
| int port) throws IOException { |
| this(type, fd, auth, encrypt, new BluetoothDevice(address), port); |
| } |
| |
| /** @hide */ |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| close(); |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| /** |
| * Attempt to connect to a remote device. |
| * <p>This method will block until a connection is made or the connection |
| * fails. If this method returns without an exception then this socket |
| * is now connected. |
| * <p>{@link #close} can be used to abort this call from another thread. |
| * @throws IOException on error, for example connection failure |
| */ |
| public void connect() throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| connectNative(); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| /** |
| * Immediately close this socket, and release all associated resources. |
| * <p>Causes blocked calls on this socket in other threads to immediately |
| * throw an IOException. |
| */ |
| public void close() throws IOException { |
| // abort blocking operations on the socket |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) return; |
| abortNative(); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| |
| // all native calls are guarenteed to immediately return after |
| // abortNative(), so this lock should immediatley acquire |
| mLock.writeLock().lock(); |
| try { |
| mClosed = true; |
| destroyNative(); |
| } finally { |
| mLock.writeLock().unlock(); |
| } |
| } |
| |
| /** |
| * Get the remote device this socket is connecting, or connected, to. |
| * @return remote device |
| */ |
| public BluetoothDevice getRemoteDevice() { |
| return mDevice; |
| } |
| |
| /** |
| * Get the input stream associated with this socket. |
| * <p>The input stream will be returned even if the socket is not yet |
| * connected, but operations on that stream will throw IOException until |
| * the associated socket is connected. |
| * @return InputStream |
| */ |
| public InputStream getInputStream() throws IOException { |
| return mInputStream; |
| } |
| |
| /** |
| * Get the output stream associated with this socket. |
| * <p>The output stream will be returned even if the socket is not yet |
| * connected, but operations on that stream will throw IOException until |
| * the associated socket is connected. |
| * @return OutputStream |
| */ |
| public OutputStream getOutputStream() throws IOException { |
| return mOutputStream; |
| } |
| |
| /*package*/ void bindListen() throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| bindListenNative(); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| /*package*/ BluetoothSocket accept(int timeout) throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| return acceptNative(timeout); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| /*package*/ int available() throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| return availableNative(); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| /*package*/ int read(byte[] b, int offset, int length) throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| return readNative(b, offset, length); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| /*package*/ int write(byte[] b, int offset, int length) throws IOException { |
| mLock.readLock().lock(); |
| try { |
| if (mClosed) throw new IOException("socket closed"); |
| return writeNative(b, offset, length); |
| } finally { |
| mLock.readLock().unlock(); |
| } |
| } |
| |
| private native void initSocketNative() throws IOException; |
| private native void initSocketFromFdNative(int fd) throws IOException; |
| private native void connectNative() throws IOException; |
| private native void bindListenNative() throws IOException; |
| private native BluetoothSocket acceptNative(int timeout) throws IOException; |
| private native int availableNative() throws IOException; |
| private native int readNative(byte[] b, int offset, int length) throws IOException; |
| private native int writeNative(byte[] b, int offset, int length) throws IOException; |
| private native void abortNative() throws IOException; |
| private native void destroyNative() throws IOException; |
| } |