J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2003 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 com.sun.tools.jdi; |
| 27 | |
| 28 | import com.sun.jdi.*; |
| 29 | import com.sun.jdi.connect.*; |
| 30 | import com.sun.jdi.connect.spi.*; |
| 31 | |
| 32 | import java.io.IOException; |
| 33 | import java.util.Map; |
| 34 | import java.util.ResourceBundle; |
| 35 | |
| 36 | class SharedMemoryTransportService extends TransportService { |
| 37 | private ResourceBundle messages = null; |
| 38 | |
| 39 | /** |
| 40 | * The listener returned by startListening |
| 41 | */ |
| 42 | static class SharedMemoryListenKey extends ListenKey { |
| 43 | long id; |
| 44 | String name; |
| 45 | |
| 46 | SharedMemoryListenKey(long id, String name) { |
| 47 | this.id = id; |
| 48 | this.name = name; |
| 49 | } |
| 50 | |
| 51 | long id() { |
| 52 | return id; |
| 53 | } |
| 54 | |
| 55 | void setId(long id) { |
| 56 | this.id = id; |
| 57 | } |
| 58 | |
| 59 | public String address() { |
| 60 | return name; |
| 61 | } |
| 62 | |
| 63 | public String toString() { |
| 64 | return address(); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | SharedMemoryTransportService() { |
| 69 | System.loadLibrary("dt_shmem"); |
| 70 | initialize(); |
| 71 | } |
| 72 | |
| 73 | public String name() { |
| 74 | return "SharedMemory"; |
| 75 | } |
| 76 | |
| 77 | public String defaultAddress() { |
| 78 | return "javadebug"; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Return localized description of this transport service |
| 83 | */ |
| 84 | public String description() { |
| 85 | synchronized (this) { |
| 86 | if (messages == null) { |
| 87 | messages = ResourceBundle.getBundle("com.sun.tools.jdi.resources.jdi"); |
| 88 | } |
| 89 | } |
| 90 | return messages.getString("memory_transportservice.description"); |
| 91 | } |
| 92 | |
| 93 | public Capabilities capabilities() { |
| 94 | return new SharedMemoryTransportServiceCapabilities(); |
| 95 | } |
| 96 | |
| 97 | private native void initialize(); |
| 98 | private native long startListening0(String address) throws IOException; |
| 99 | private native long attach0(String address, long attachTimeout) throws IOException; |
| 100 | private native void stopListening0(long id) throws IOException; |
| 101 | private native long accept0(long id, long acceptTimeout) throws IOException; |
| 102 | private native String name(long id) throws IOException; |
| 103 | |
| 104 | public Connection attach(String address, long attachTimeout, long handshakeTimeout) throws IOException { |
| 105 | if (address == null) { |
| 106 | throw new NullPointerException("address is null"); |
| 107 | } |
| 108 | long id = attach0(address, attachTimeout); |
| 109 | SharedMemoryConnection conn = new SharedMemoryConnection(id); |
| 110 | conn.handshake(handshakeTimeout); |
| 111 | return conn; |
| 112 | } |
| 113 | |
| 114 | public TransportService.ListenKey startListening(String address) throws IOException { |
| 115 | if (address == null || address.length() == 0) { |
| 116 | address = defaultAddress(); |
| 117 | } |
| 118 | long id = startListening0(address); |
| 119 | return new SharedMemoryListenKey(id, name(id)); |
| 120 | } |
| 121 | |
| 122 | public ListenKey startListening() throws IOException { |
| 123 | return startListening(null); |
| 124 | } |
| 125 | |
| 126 | public void stopListening(ListenKey listener) throws IOException { |
| 127 | if (!(listener instanceof SharedMemoryListenKey)) { |
| 128 | throw new IllegalArgumentException("Invalid listener"); |
| 129 | } |
| 130 | |
| 131 | long id; |
| 132 | SharedMemoryListenKey key = (SharedMemoryListenKey)listener; |
| 133 | synchronized (key) { |
| 134 | id = key.id(); |
| 135 | if (id == 0) { |
| 136 | throw new IllegalArgumentException("Invalid listener"); |
| 137 | } |
| 138 | |
| 139 | // invalidate the id |
| 140 | key.setId(0); |
| 141 | } |
| 142 | stopListening0(id); |
| 143 | } |
| 144 | |
| 145 | public Connection accept(ListenKey listener, long acceptTimeout, long handshakeTimeout) throws IOException { |
| 146 | if (!(listener instanceof SharedMemoryListenKey)) { |
| 147 | throw new IllegalArgumentException("Invalid listener"); |
| 148 | } |
| 149 | |
| 150 | long transportId; |
| 151 | SharedMemoryListenKey key = (SharedMemoryListenKey)listener; |
| 152 | synchronized (key) { |
| 153 | transportId = key.id(); |
| 154 | if (transportId == 0) { |
| 155 | throw new IllegalArgumentException("Invalid listener"); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | // in theory another thread could call stopListening before |
| 160 | // accept0 is called. In that case accept0 will try to accept |
| 161 | // with an invalid "transport id" - this should result in an |
| 162 | // IOException. |
| 163 | |
| 164 | long connectId = accept0(transportId, acceptTimeout); |
| 165 | SharedMemoryConnection conn = new SharedMemoryConnection(connectId); |
| 166 | conn.handshake(handshakeTimeout); |
| 167 | return conn; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | class SharedMemoryConnection extends Connection { |
| 172 | private long id; |
| 173 | private Object receiveLock = new Object(); |
| 174 | private Object sendLock = new Object(); |
| 175 | private Object closeLock = new Object(); |
| 176 | private boolean closed = false; |
| 177 | |
| 178 | private native byte receiveByte0(long id) throws IOException; |
| 179 | private native void sendByte0(long id, byte b) throws IOException; |
| 180 | private native void close0(long id); |
| 181 | private native byte[] receivePacket0(long id)throws IOException; |
| 182 | private native void sendPacket0(long id, byte b[]) throws IOException; |
| 183 | |
| 184 | // handshake with the target VM |
| 185 | void handshake(long handshakeTimeout) throws IOException { |
| 186 | byte[] hello = "JDWP-Handshake".getBytes("UTF-8"); |
| 187 | |
| 188 | for (int i=0; i<hello.length; i++) { |
| 189 | sendByte0(id, hello[i]); |
| 190 | } |
| 191 | for (int i=0; i<hello.length; i++) { |
| 192 | byte b = receiveByte0(id); |
| 193 | if (b != hello[i]) { |
| 194 | throw new IOException("handshake failed - unrecognized message from target VM"); |
| 195 | } |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | |
| 200 | SharedMemoryConnection(long id) throws IOException { |
| 201 | this.id = id; |
| 202 | } |
| 203 | |
| 204 | public void close() { |
| 205 | synchronized (closeLock) { |
| 206 | if (!closed) { |
| 207 | close0(id); |
| 208 | closed = true; |
| 209 | } |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | public boolean isOpen() { |
| 214 | synchronized (closeLock) { |
| 215 | return !closed; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | public byte[] readPacket() throws IOException { |
| 220 | if (!isOpen()) { |
| 221 | throw new ClosedConnectionException("Connection closed"); |
| 222 | } |
| 223 | byte b[]; |
| 224 | try { |
| 225 | // only one thread may be reading at a time |
| 226 | synchronized (receiveLock) { |
| 227 | b = receivePacket0(id); |
| 228 | } |
| 229 | } catch (IOException ioe) { |
| 230 | if (!isOpen()) { |
| 231 | throw new ClosedConnectionException("Connection closed"); |
| 232 | } else { |
| 233 | throw ioe; |
| 234 | } |
| 235 | } |
| 236 | return b; |
| 237 | } |
| 238 | |
| 239 | public void writePacket(byte b[]) throws IOException { |
| 240 | if (!isOpen()) { |
| 241 | throw new ClosedConnectionException("Connection closed"); |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Check the packet size |
| 246 | */ |
| 247 | if (b.length < 11) { |
| 248 | throw new IllegalArgumentException("packet is insufficient size"); |
| 249 | } |
| 250 | int b0 = b[0] & 0xff; |
| 251 | int b1 = b[1] & 0xff; |
| 252 | int b2 = b[2] & 0xff; |
| 253 | int b3 = b[3] & 0xff; |
| 254 | int len = ((b0 << 24) | (b1 << 16) | (b2 << 8) | (b3 << 0)); |
| 255 | if (len < 11) { |
| 256 | throw new IllegalArgumentException("packet is insufficient size"); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Check that the byte array contains the complete packet |
| 261 | */ |
| 262 | if (len > b.length) { |
| 263 | throw new IllegalArgumentException("length mis-match"); |
| 264 | } |
| 265 | |
| 266 | try { |
| 267 | // only one thread may be writing at a time |
| 268 | synchronized(sendLock) { |
| 269 | sendPacket0(id, b); |
| 270 | } |
| 271 | } catch (IOException ioe) { |
| 272 | if (!isOpen()) { |
| 273 | throw new ClosedConnectionException("Connection closed"); |
| 274 | } else { |
| 275 | throw ioe; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | |
| 282 | class SharedMemoryTransportServiceCapabilities extends TransportService.Capabilities { |
| 283 | |
| 284 | public boolean supportsMultipleConnections() { |
| 285 | return false; |
| 286 | } |
| 287 | |
| 288 | public boolean supportsAttachTimeout() { |
| 289 | return true; |
| 290 | } |
| 291 | |
| 292 | public boolean supportsAcceptTimeout() { |
| 293 | return true; |
| 294 | } |
| 295 | |
| 296 | public boolean supportsHandshakeTimeout() { |
| 297 | return false; |
| 298 | } |
| 299 | |
| 300 | } |