J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.nio.ch; |
| 27 | |
| 28 | import java.io.FileDescriptor; |
| 29 | import java.io.IOException; |
| 30 | import java.net.*; |
| 31 | import java.nio.ByteBuffer; |
| 32 | import java.nio.channels.*; |
| 33 | import java.nio.channels.spi.*; |
| 34 | import java.lang.ref.SoftReference; |
| 35 | |
| 36 | |
| 37 | /** |
| 38 | * An implementation of DatagramChannels. |
| 39 | */ |
| 40 | |
| 41 | class DatagramChannelImpl |
| 42 | extends DatagramChannel |
| 43 | implements SelChImpl |
| 44 | { |
| 45 | |
| 46 | // Used to make native read and write calls |
| 47 | private static NativeDispatcher nd = new DatagramDispatcher(); |
| 48 | |
| 49 | // Our file descriptor |
| 50 | FileDescriptor fd = null; |
| 51 | |
| 52 | // fd value needed for dev/poll. This value will remain valid |
| 53 | // even after the value in the file descriptor object has been set to -1 |
| 54 | int fdVal; |
| 55 | |
| 56 | // IDs of native threads doing reads and writes, for signalling |
| 57 | private volatile long readerThread = 0; |
| 58 | private volatile long writerThread = 0; |
| 59 | |
| 60 | // Cached InetAddress and port for unconnected DatagramChannels |
| 61 | // used by receive0 |
| 62 | private InetAddress cachedSenderInetAddress = null; |
| 63 | private int cachedSenderPort = 0; |
| 64 | |
| 65 | // Lock held by current reading or connecting thread |
| 66 | private final Object readLock = new Object(); |
| 67 | |
| 68 | // Lock held by current writing or connecting thread |
| 69 | private final Object writeLock = new Object(); |
| 70 | |
| 71 | // Lock held by any thread that modifies the state fields declared below |
| 72 | // DO NOT invoke a blocking I/O operation while holding this lock! |
| 73 | private final Object stateLock = new Object(); |
| 74 | |
| 75 | // -- The following fields are protected by stateLock |
| 76 | |
| 77 | // State (does not necessarily increase monotonically) |
| 78 | private static final int ST_UNINITIALIZED = -1; |
| 79 | private static int ST_UNCONNECTED = 0; |
| 80 | private static int ST_CONNECTED = 1; |
| 81 | private static final int ST_KILLED = 2; |
| 82 | private int state = ST_UNINITIALIZED; |
| 83 | |
| 84 | // Binding |
| 85 | private SocketAddress localAddress = null; |
| 86 | SocketAddress remoteAddress = null; |
| 87 | |
| 88 | // Options |
| 89 | private SocketOpts.IP options = null; |
| 90 | |
| 91 | // Our socket adaptor, if any |
| 92 | private DatagramSocket socket = null; |
| 93 | |
| 94 | // -- End of fields protected by stateLock |
| 95 | |
| 96 | |
| 97 | public DatagramChannelImpl(SelectorProvider sp) |
| 98 | throws IOException |
| 99 | { |
| 100 | super(sp); |
| 101 | this.fd = Net.socket(false); |
| 102 | this.fdVal = IOUtil.fdVal(fd); |
| 103 | this.state = ST_UNCONNECTED; |
| 104 | } |
| 105 | |
| 106 | public DatagramChannelImpl(SelectorProvider sp, FileDescriptor fd) |
| 107 | throws IOException |
| 108 | { |
| 109 | super(sp); |
| 110 | this.fd = fd; |
| 111 | this.fdVal = IOUtil.fdVal(fd); |
| 112 | this.state = ST_UNCONNECTED; |
| 113 | } |
| 114 | |
| 115 | public DatagramSocket socket() { |
| 116 | synchronized (stateLock) { |
| 117 | if (socket == null) |
| 118 | socket = DatagramSocketAdaptor.create(this); |
| 119 | return socket; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | private void ensureOpen() throws ClosedChannelException { |
| 124 | if (!isOpen()) |
| 125 | throw new ClosedChannelException(); |
| 126 | } |
| 127 | |
| 128 | private SocketAddress sender; // Set by receive0 (## ugh) |
| 129 | |
| 130 | public SocketAddress receive(ByteBuffer dst) throws IOException { |
| 131 | if (dst.isReadOnly()) |
| 132 | throw new IllegalArgumentException("Read-only buffer"); |
| 133 | if (dst == null) |
| 134 | throw new NullPointerException(); |
| 135 | synchronized (readLock) { |
| 136 | ensureOpen(); |
| 137 | // If socket is not bound then behave as if nothing received |
| 138 | if (!isBound()) // ## NotYetBoundException ?? |
| 139 | return null; |
| 140 | int n = 0; |
| 141 | ByteBuffer bb = null; |
| 142 | try { |
| 143 | begin(); |
| 144 | if (!isOpen()) |
| 145 | return null; |
| 146 | SecurityManager security = System.getSecurityManager(); |
| 147 | readerThread = NativeThread.current(); |
| 148 | if (isConnected() || (security == null)) { |
| 149 | do { |
| 150 | n = receive(fd, dst); |
| 151 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 152 | if (n == IOStatus.UNAVAILABLE) |
| 153 | return null; |
| 154 | } else { |
| 155 | bb = Util.getTemporaryDirectBuffer(dst.remaining()); |
| 156 | for (;;) { |
| 157 | do { |
| 158 | n = receive(fd, bb); |
| 159 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 160 | if (n == IOStatus.UNAVAILABLE) |
| 161 | return null; |
| 162 | InetSocketAddress isa = (InetSocketAddress)sender; |
| 163 | try { |
| 164 | security.checkAccept( |
| 165 | isa.getAddress().getHostAddress(), |
| 166 | isa.getPort()); |
| 167 | } catch (SecurityException se) { |
| 168 | // Ignore packet |
| 169 | bb.clear(); |
| 170 | n = 0; |
| 171 | continue; |
| 172 | } |
| 173 | bb.flip(); |
| 174 | dst.put(bb); |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | return sender; |
| 179 | } finally { |
| 180 | if (bb != null) |
| 181 | Util.releaseTemporaryDirectBuffer(bb); |
| 182 | readerThread = 0; |
| 183 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 184 | assert IOStatus.check(n); |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | private int receive(FileDescriptor fd, ByteBuffer dst) |
| 190 | throws IOException |
| 191 | { |
| 192 | int pos = dst.position(); |
| 193 | int lim = dst.limit(); |
| 194 | assert (pos <= lim); |
| 195 | int rem = (pos <= lim ? lim - pos : 0); |
| 196 | if (dst instanceof DirectBuffer && rem > 0) |
| 197 | return receiveIntoNativeBuffer(fd, dst, rem, pos); |
| 198 | |
| 199 | // Substitute a native buffer. If the supplied buffer is empty |
| 200 | // we must instead use a nonempty buffer, otherwise the call |
| 201 | // will not block waiting for a datagram on some platforms. |
| 202 | int newSize = Math.max(rem, 1); |
| 203 | ByteBuffer bb = null; |
| 204 | try { |
| 205 | bb = Util.getTemporaryDirectBuffer(newSize); |
| 206 | int n = receiveIntoNativeBuffer(fd, bb, newSize, 0); |
| 207 | bb.flip(); |
| 208 | if (n > 0 && rem > 0) |
| 209 | dst.put(bb); |
| 210 | return n; |
| 211 | } finally { |
| 212 | Util.releaseTemporaryDirectBuffer(bb); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | private int receiveIntoNativeBuffer(FileDescriptor fd, ByteBuffer bb, |
| 217 | int rem, int pos) |
| 218 | throws IOException |
| 219 | { |
| 220 | int n = receive0(fd, ((DirectBuffer)bb).address() + pos, rem, |
| 221 | isConnected()); |
| 222 | if (n > 0) |
| 223 | bb.position(pos + n); |
| 224 | return n; |
| 225 | } |
| 226 | |
| 227 | public int send(ByteBuffer src, SocketAddress target) |
| 228 | throws IOException |
| 229 | { |
| 230 | if (src == null) |
| 231 | throw new NullPointerException(); |
| 232 | |
| 233 | synchronized (writeLock) { |
| 234 | ensureOpen(); |
| 235 | InetSocketAddress isa = (InetSocketAddress)target; |
| 236 | InetAddress ia = isa.getAddress(); |
| 237 | if (ia == null) |
| 238 | throw new IOException("Target address not resolved"); |
| 239 | synchronized (stateLock) { |
| 240 | if (!isConnected()) { |
| 241 | if (target == null) |
| 242 | throw new NullPointerException(); |
| 243 | SecurityManager sm = System.getSecurityManager(); |
| 244 | if (sm != null) { |
| 245 | if (ia.isMulticastAddress()) { |
| 246 | sm.checkMulticast(isa.getAddress()); |
| 247 | } else { |
| 248 | sm.checkConnect(isa.getAddress().getHostAddress(), |
| 249 | isa.getPort()); |
| 250 | } |
| 251 | } |
| 252 | } else { // Connected case; Check address then write |
| 253 | if (!target.equals(remoteAddress)) { |
| 254 | throw new IllegalArgumentException( |
| 255 | "Connected address not equal to target address"); |
| 256 | } |
| 257 | return write(src); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | int n = 0; |
| 262 | try { |
| 263 | begin(); |
| 264 | if (!isOpen()) |
| 265 | return 0; |
| 266 | writerThread = NativeThread.current(); |
| 267 | do { |
| 268 | n = send(fd, src, target); |
| 269 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 270 | return IOStatus.normalize(n); |
| 271 | } finally { |
| 272 | writerThread = 0; |
| 273 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 274 | assert IOStatus.check(n); |
| 275 | } |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | private int send(FileDescriptor fd, ByteBuffer src, SocketAddress target) |
| 280 | throws IOException |
| 281 | { |
| 282 | if (src instanceof DirectBuffer) |
| 283 | return sendFromNativeBuffer(fd, src, target); |
| 284 | |
| 285 | // Substitute a native buffer |
| 286 | int pos = src.position(); |
| 287 | int lim = src.limit(); |
| 288 | assert (pos <= lim); |
| 289 | int rem = (pos <= lim ? lim - pos : 0); |
| 290 | |
| 291 | ByteBuffer bb = null; |
| 292 | try { |
| 293 | bb = Util.getTemporaryDirectBuffer(rem); |
| 294 | bb.put(src); |
| 295 | bb.flip(); |
| 296 | // Do not update src until we see how many bytes were written |
| 297 | src.position(pos); |
| 298 | |
| 299 | int n = sendFromNativeBuffer(fd, bb, target); |
| 300 | if (n > 0) { |
| 301 | // now update src |
| 302 | src.position(pos + n); |
| 303 | } |
| 304 | return n; |
| 305 | } finally { |
| 306 | Util.releaseTemporaryDirectBuffer(bb); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | private int sendFromNativeBuffer(FileDescriptor fd, ByteBuffer bb, |
| 311 | SocketAddress target) |
| 312 | throws IOException |
| 313 | { |
| 314 | int pos = bb.position(); |
| 315 | int lim = bb.limit(); |
| 316 | assert (pos <= lim); |
| 317 | int rem = (pos <= lim ? lim - pos : 0); |
| 318 | |
| 319 | int written = send0(fd, ((DirectBuffer)bb).address() + pos, |
| 320 | rem, target); |
| 321 | if (written > 0) |
| 322 | bb.position(pos + written); |
| 323 | return written; |
| 324 | } |
| 325 | |
| 326 | public int read(ByteBuffer buf) throws IOException { |
| 327 | if (buf == null) |
| 328 | throw new NullPointerException(); |
| 329 | synchronized (readLock) { |
| 330 | synchronized (stateLock) { |
| 331 | ensureOpen(); |
| 332 | if (!isConnected()) |
| 333 | throw new NotYetConnectedException(); |
| 334 | } |
| 335 | int n = 0; |
| 336 | try { |
| 337 | begin(); |
| 338 | if (!isOpen()) |
| 339 | return 0; |
| 340 | readerThread = NativeThread.current(); |
| 341 | do { |
| 342 | n = IOUtil.read(fd, buf, -1, nd, readLock); |
| 343 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 344 | return IOStatus.normalize(n); |
| 345 | } finally { |
| 346 | readerThread = 0; |
| 347 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 348 | assert IOStatus.check(n); |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | private long read0(ByteBuffer[] bufs) throws IOException { |
| 354 | if (bufs == null) |
| 355 | throw new NullPointerException(); |
| 356 | synchronized (readLock) { |
| 357 | synchronized (stateLock) { |
| 358 | ensureOpen(); |
| 359 | if (!isConnected()) |
| 360 | throw new NotYetConnectedException(); |
| 361 | } |
| 362 | long n = 0; |
| 363 | try { |
| 364 | begin(); |
| 365 | if (!isOpen()) |
| 366 | return 0; |
| 367 | readerThread = NativeThread.current(); |
| 368 | do { |
| 369 | n = IOUtil.read(fd, bufs, nd); |
| 370 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 371 | return IOStatus.normalize(n); |
| 372 | } finally { |
| 373 | readerThread = 0; |
| 374 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 375 | assert IOStatus.check(n); |
| 376 | } |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | public long read(ByteBuffer[] dsts, int offset, int length) |
| 381 | throws IOException |
| 382 | { |
| 383 | if ((offset < 0) || (length < 0) || (offset > dsts.length - length)) |
| 384 | throw new IndexOutOfBoundsException(); |
| 385 | // ## Fix IOUtil.write so that we can avoid this array copy |
| 386 | return read0(Util.subsequence(dsts, offset, length)); |
| 387 | } |
| 388 | |
| 389 | public int write(ByteBuffer buf) throws IOException { |
| 390 | if (buf == null) |
| 391 | throw new NullPointerException(); |
| 392 | synchronized (writeLock) { |
| 393 | synchronized (stateLock) { |
| 394 | ensureOpen(); |
| 395 | if (!isConnected()) |
| 396 | throw new NotYetConnectedException(); |
| 397 | } |
| 398 | int n = 0; |
| 399 | try { |
| 400 | begin(); |
| 401 | if (!isOpen()) |
| 402 | return 0; |
| 403 | writerThread = NativeThread.current(); |
| 404 | do { |
| 405 | n = IOUtil.write(fd, buf, -1, nd, writeLock); |
| 406 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 407 | return IOStatus.normalize(n); |
| 408 | } finally { |
| 409 | writerThread = 0; |
| 410 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 411 | assert IOStatus.check(n); |
| 412 | } |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | private long write0(ByteBuffer[] bufs) throws IOException { |
| 417 | if (bufs == null) |
| 418 | throw new NullPointerException(); |
| 419 | synchronized (writeLock) { |
| 420 | synchronized (stateLock) { |
| 421 | ensureOpen(); |
| 422 | if (!isConnected()) |
| 423 | throw new NotYetConnectedException(); |
| 424 | } |
| 425 | long n = 0; |
| 426 | try { |
| 427 | begin(); |
| 428 | if (!isOpen()) |
| 429 | return 0; |
| 430 | writerThread = NativeThread.current(); |
| 431 | do { |
| 432 | n = IOUtil.write(fd, bufs, nd); |
| 433 | } while ((n == IOStatus.INTERRUPTED) && isOpen()); |
| 434 | return IOStatus.normalize(n); |
| 435 | } finally { |
| 436 | writerThread = 0; |
| 437 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 438 | assert IOStatus.check(n); |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | public long write(ByteBuffer[] srcs, int offset, int length) |
| 444 | throws IOException |
| 445 | { |
| 446 | if ((offset < 0) || (length < 0) || (offset > srcs.length - length)) |
| 447 | throw new IndexOutOfBoundsException(); |
| 448 | // ## Fix IOUtil.write so that we can avoid this array copy |
| 449 | return write0(Util.subsequence(srcs, offset, length)); |
| 450 | } |
| 451 | |
| 452 | protected void implConfigureBlocking(boolean block) throws IOException { |
| 453 | IOUtil.configureBlocking(fd, block); |
| 454 | } |
| 455 | |
| 456 | public SocketOpts options() { |
| 457 | synchronized (stateLock) { |
| 458 | if (options == null) { |
| 459 | SocketOptsImpl.Dispatcher d |
| 460 | = new SocketOptsImpl.Dispatcher() { |
| 461 | int getInt(int opt) throws IOException { |
| 462 | return Net.getIntOption(fd, opt); |
| 463 | } |
| 464 | void setInt(int opt, int arg) |
| 465 | throws IOException |
| 466 | { |
| 467 | Net.setIntOption(fd, opt, arg); |
| 468 | } |
| 469 | }; |
| 470 | options = new SocketOptsImpl.IP(d); |
| 471 | } |
| 472 | return options; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | public boolean isBound() { |
| 477 | return Net.localPortNumber(fd) != 0; |
| 478 | } |
| 479 | |
| 480 | public SocketAddress localAddress() { |
| 481 | synchronized (stateLock) { |
| 482 | if (isConnected() && (localAddress == null)) { |
| 483 | // Socket was not bound before connecting, |
| 484 | // so ask what the address turned out to be |
| 485 | localAddress = Net.localAddress(fd); |
| 486 | } |
| 487 | SecurityManager sm = System.getSecurityManager(); |
| 488 | if (sm != null) { |
| 489 | InetSocketAddress isa = (InetSocketAddress)localAddress; |
| 490 | sm.checkConnect(isa.getAddress().getHostAddress(), -1); |
| 491 | } |
| 492 | return localAddress; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | public SocketAddress remoteAddress() { |
| 497 | synchronized (stateLock) { |
| 498 | return remoteAddress; |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | public void bind(SocketAddress local) throws IOException { |
| 503 | synchronized (readLock) { |
| 504 | synchronized (writeLock) { |
| 505 | synchronized (stateLock) { |
| 506 | ensureOpen(); |
| 507 | if (isBound()) |
| 508 | throw new AlreadyBoundException(); |
| 509 | InetSocketAddress isa = Net.checkAddress(local); |
| 510 | SecurityManager sm = System.getSecurityManager(); |
| 511 | if (sm != null) |
| 512 | sm.checkListen(isa.getPort()); |
| 513 | Net.bind(fd, isa.getAddress(), isa.getPort()); |
| 514 | localAddress = Net.localAddress(fd); |
| 515 | } |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | public boolean isConnected() { |
| 521 | synchronized (stateLock) { |
| 522 | return (state == ST_CONNECTED); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | void ensureOpenAndUnconnected() throws IOException { // package-private |
| 527 | synchronized (stateLock) { |
| 528 | if (!isOpen()) |
| 529 | throw new ClosedChannelException(); |
| 530 | if (state != ST_UNCONNECTED) |
| 531 | throw new IllegalStateException("Connect already invoked"); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | public DatagramChannel connect(SocketAddress sa) throws IOException { |
| 536 | int trafficClass = 0; |
| 537 | int localPort = 0; |
| 538 | |
| 539 | synchronized(readLock) { |
| 540 | synchronized(writeLock) { |
| 541 | synchronized (stateLock) { |
| 542 | ensureOpenAndUnconnected(); |
| 543 | InetSocketAddress isa = Net.checkAddress(sa); |
| 544 | SecurityManager sm = System.getSecurityManager(); |
| 545 | if (sm != null) |
| 546 | sm.checkConnect(isa.getAddress().getHostAddress(), |
| 547 | isa.getPort()); |
| 548 | int n = Net.connect(fd, |
| 549 | isa.getAddress(), |
| 550 | isa.getPort(), |
| 551 | trafficClass); |
| 552 | if (n <= 0) |
| 553 | throw new Error(); // Can't happen |
| 554 | |
| 555 | // Connection succeeded; disallow further invocation |
| 556 | state = ST_CONNECTED; |
| 557 | remoteAddress = sa; |
| 558 | sender = isa; |
| 559 | cachedSenderInetAddress = isa.getAddress(); |
| 560 | cachedSenderPort = isa.getPort(); |
| 561 | } |
| 562 | } |
| 563 | } |
| 564 | return this; |
| 565 | } |
| 566 | |
| 567 | public DatagramChannel disconnect() throws IOException { |
| 568 | synchronized(readLock) { |
| 569 | synchronized(writeLock) { |
| 570 | synchronized (stateLock) { |
| 571 | if (!isConnected() || !isOpen()) |
| 572 | return this; |
| 573 | InetSocketAddress isa = (InetSocketAddress)remoteAddress; |
| 574 | SecurityManager sm = System.getSecurityManager(); |
| 575 | if (sm != null) |
| 576 | sm.checkConnect(isa.getAddress().getHostAddress(), |
| 577 | isa.getPort()); |
| 578 | disconnect0(fd); |
| 579 | remoteAddress = null; |
| 580 | state = ST_UNCONNECTED; |
| 581 | } |
| 582 | } |
| 583 | } |
| 584 | return this; |
| 585 | } |
| 586 | |
| 587 | protected void implCloseSelectableChannel() throws IOException { |
| 588 | synchronized (stateLock) { |
| 589 | nd.preClose(fd); |
| 590 | long th; |
| 591 | if ((th = readerThread) != 0) |
| 592 | NativeThread.signal(th); |
| 593 | if ((th = writerThread) != 0) |
| 594 | NativeThread.signal(th); |
| 595 | if (!isRegistered()) |
| 596 | kill(); |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | public void kill() throws IOException { |
| 601 | synchronized (stateLock) { |
| 602 | if (state == ST_KILLED) |
| 603 | return; |
| 604 | if (state == ST_UNINITIALIZED) { |
| 605 | state = ST_KILLED; |
| 606 | return; |
| 607 | } |
| 608 | assert !isOpen() && !isRegistered(); |
| 609 | nd.close(fd); |
| 610 | state = ST_KILLED; |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | protected void finalize() throws IOException { |
| 615 | // fd is null if constructor threw exception |
| 616 | if (fd != null) |
| 617 | close(); |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * Translates native poll revent set into a ready operation set |
| 622 | */ |
| 623 | public boolean translateReadyOps(int ops, int initialOps, |
| 624 | SelectionKeyImpl sk) { |
| 625 | int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes |
| 626 | int oldOps = sk.nioReadyOps(); |
| 627 | int newOps = initialOps; |
| 628 | |
| 629 | if ((ops & PollArrayWrapper.POLLNVAL) != 0) { |
| 630 | // This should only happen if this channel is pre-closed while a |
| 631 | // selection operation is in progress |
| 632 | // ## Throw an error if this channel has not been pre-closed |
| 633 | return false; |
| 634 | } |
| 635 | |
| 636 | if ((ops & (PollArrayWrapper.POLLERR |
| 637 | | PollArrayWrapper.POLLHUP)) != 0) { |
| 638 | newOps = intOps; |
| 639 | sk.nioReadyOps(newOps); |
| 640 | return (newOps & ~oldOps) != 0; |
| 641 | } |
| 642 | |
| 643 | if (((ops & PollArrayWrapper.POLLIN) != 0) && |
| 644 | ((intOps & SelectionKey.OP_READ) != 0)) |
| 645 | newOps |= SelectionKey.OP_READ; |
| 646 | |
| 647 | if (((ops & PollArrayWrapper.POLLOUT) != 0) && |
| 648 | ((intOps & SelectionKey.OP_WRITE) != 0)) |
| 649 | newOps |= SelectionKey.OP_WRITE; |
| 650 | |
| 651 | sk.nioReadyOps(newOps); |
| 652 | return (newOps & ~oldOps) != 0; |
| 653 | } |
| 654 | |
| 655 | public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) { |
| 656 | return translateReadyOps(ops, sk.nioReadyOps(), sk); |
| 657 | } |
| 658 | |
| 659 | public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) { |
| 660 | return translateReadyOps(ops, 0, sk); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * Translates an interest operation set into a native poll event set |
| 665 | */ |
| 666 | public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) { |
| 667 | int newOps = 0; |
| 668 | |
| 669 | if ((ops & SelectionKey.OP_READ) != 0) |
| 670 | newOps |= PollArrayWrapper.POLLIN; |
| 671 | if ((ops & SelectionKey.OP_WRITE) != 0) |
| 672 | newOps |= PollArrayWrapper.POLLOUT; |
| 673 | if ((ops & SelectionKey.OP_CONNECT) != 0) |
| 674 | newOps |= PollArrayWrapper.POLLIN; |
| 675 | sk.selector.putEventOps(sk, newOps); |
| 676 | } |
| 677 | |
| 678 | public FileDescriptor getFD() { |
| 679 | return fd; |
| 680 | } |
| 681 | |
| 682 | public int getFDVal() { |
| 683 | return fdVal; |
| 684 | } |
| 685 | |
| 686 | |
| 687 | // -- Native methods -- |
| 688 | |
| 689 | private static native void initIDs(); |
| 690 | |
| 691 | private static native void disconnect0(FileDescriptor fd) |
| 692 | throws IOException; |
| 693 | |
| 694 | private native int receive0(FileDescriptor fd, long address, int len, |
| 695 | boolean connected) |
| 696 | throws IOException; |
| 697 | |
| 698 | private native int send0(FileDescriptor fd, long address, int len, |
| 699 | SocketAddress sa) |
| 700 | throws IOException; |
| 701 | |
| 702 | static { |
| 703 | Util.load(); |
| 704 | initIDs(); |
| 705 | } |
| 706 | |
| 707 | } |