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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2004, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package com.sun.jdi; | |
| 27 | + | |
| 28 | +import com.sun.jdi.connect.*; | |
| 29 | +import com.sun.jdi.connect.spi.Connection; | |
| 30 | +import java.util.List; | |
| 31 | +import java.io.IOException; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * A manager of connections to target virtual machines. The | |
| 35 | + * VirtualMachineManager allows one application to debug | |
| 36 | + * multiple target VMs. (Note that the converse is not | |
| 37 | + * supported; a target VM can be debugged by only one | |
| 38 | + * debugger application.) This interface | |
| 39 | + * contains methods to manage connections | |
| 40 | + * to remote target VMs and to obtain the {@link VirtualMachine} | |
| 41 | + * mirror for available target VMs. | |
| 42 | + * <p> | |
| 43 | + * Connections can be made using one of several different | |
| 44 | + * {@link com.sun.jdi.connect.Connector} objects. Each connector encapsulates | |
| 45 | + * a different way of connecting the debugger with a target VM. | |
| 46 | + * <p> | |
| 47 | + * The VirtualMachineManager supports many different scenarios for | |
| 48 | + * connecting a debugger to a virtual machine. Four examples | |
| 49 | + * are presented in the table below. The | |
| 50 | + * examples use the command line syntax in Sun's implementation. | |
| 51 | + * Some {@link com.sun.jdi.connect.Connector} implementations may require slightly | |
| 52 | + * different handling than presented below. | |
| 53 | + * <p> | |
| 54 | + * <TABLE BORDER WIDTH="75%" SUMMARY="Four scenarios for connecting a debugger | |
| 55 | + * to a virtual machine"> | |
| 56 | + * <TR> | |
| 57 | + * <TH scope=col>Scenario</TH> | |
| 58 | + * <TH scope=col>Description</TH> | |
| 59 | + * <TR> | |
| 60 | + * <TD>Debugger launches target VM (simplest, most-common scenario)</TD> | |
| 61 | + * | |
| 62 | + * <TD>Debugger calls the | |
| 63 | + * {@link com.sun.jdi.connect.LaunchingConnector#launch(java.util.Map)} | |
| 64 | + * method of the default connector, obtained with {@link #defaultConnector}. The | |
| 65 | + * target VM is launched, and a connection between that VM and the | |
| 66 | + * debugger is established. A {@link VirtualMachine} mirror is returned. | |
| 67 | + * <P>Or, for more control | |
| 68 | + * <UL> | |
| 69 | + * <LI> | |
| 70 | + * Debugger selects a connector from the list returned by | |
| 71 | + * {@link #launchingConnectors} with desired characteristics | |
| 72 | + * (for example, transport type, etc.). | |
| 73 | + * <LI> | |
| 74 | + * Debugger calls the | |
| 75 | + * {@link com.sun.jdi.connect.LaunchingConnector#launch(java.util.Map)} | |
| 76 | + * method of the selected connector. The | |
| 77 | + * target VM is launched, and a connection between that VM and the | |
| 78 | + * debugger is established. A {@link VirtualMachine} mirror is returned. | |
| 79 | + * </UL> | |
| 80 | + * </TD> | |
| 81 | + * </TR> | |
| 82 | + * <TR> | |
| 83 | + * <TD>Debugger attaches to previously-running VM</TD> | |
| 84 | + * <TD> | |
| 85 | + * <UL> | |
| 86 | + * <LI> | |
| 87 | + * Target VM is launched using the options | |
| 88 | + * <code>-agentlib:jdwp=transport=xxx,server=y</code> | |
| 89 | + * </LI> | |
| 90 | + * <LI> | |
| 91 | + * Target VM generates and outputs the tranport-specific address at which it will | |
| 92 | + * listen for a connection.</LI> | |
| 93 | + * <LI> | |
| 94 | + * Debugger is launched. Debugger selects a connector in the list | |
| 95 | + * returned by {@link #attachingConnectors} matching the transport with | |
| 96 | + * the name "xxx". | |
| 97 | + * <LI> | |
| 98 | + * Debugger presents the default connector parameters (obtained through | |
| 99 | + * {@link com.sun.jdi.connect.Connector#defaultArguments()}) to the end user, | |
| 100 | + * allowing the user to | |
| 101 | + * fill in the transport-specific address generated by the target VM. | |
| 102 | + * <LI> | |
| 103 | + * Debugger calls the {@link com.sun.jdi.connect.AttachingConnector#attach(java.util.Map)} method | |
| 104 | + * of the selected to attach to the target VM. A {@link VirtualMachine} | |
| 105 | + * mirror is returned. | |
| 106 | + * </UL> | |
| 107 | + * </TD> | |
| 108 | + * </TR> | |
| 109 | + * | |
| 110 | + * <TR> | |
| 111 | + * <TD>Target VM attaches to previously-running debugger</TD> | |
| 112 | + * <TD> | |
| 113 | + * <LI> | |
| 114 | + * At startup, debugger selects one or more connectors from | |
| 115 | + * the list returned by {@link #listeningConnectors} for one or more | |
| 116 | + * transports.</LI> | |
| 117 | + * <LI> | |
| 118 | + * Debugger calls the {@link com.sun.jdi.connect.ListeningConnector#startListening(java.util.Map)} method for each selected | |
| 119 | + * connector. For each call, a transport-specific address string is | |
| 120 | + * generated and returned. The debugger makes the transport names and | |
| 121 | + * corresponding address strings available to the end user. | |
| 122 | + * <LI> | |
| 123 | + * Debugger calls | |
| 124 | + * {@link com.sun.jdi.connect.ListeningConnector#accept(java.util.Map)} | |
| 125 | + * for each selected connector to wait for | |
| 126 | + * a target VM to connect.</LI> | |
| 127 | + * <LI> | |
| 128 | + * Later, target VM is launched by end user with the options | |
| 129 | + * <code>-agentlib:jdwp=transport=xxx,address=yyy</code> | |
| 130 | + * where "xxx" the transport for one of the connectors selected by the | |
| 131 | + * the debugger and "yyy" | |
| 132 | + * is the address generated by | |
| 133 | + * {@link com.sun.jdi.connect.ListeningConnector#accept(java.util.Map)} for that | |
| 134 | + * transport.</LI> | |
| 135 | + * <LI> | |
| 136 | + * Debugger's call to {@link com.sun.jdi.connect.ListeningConnector#accept(java.util.Map)} returns | |
| 137 | + * a {@link VirtualMachine} mirror.</LI> | |
| 138 | + * </TD> | |
| 139 | + * </TR> | |
| 140 | + * | |
| 141 | + * <TR> | |
| 142 | + * <TD>Target VM launches debugger (sometimes called "Just-In-Time" debugging)</TD> | |
| 143 | + * <TD> | |
| 144 | + * <LI> | |
| 145 | + * Target VM is launched with the options | |
| 146 | + * <code>-agentlib:jdwp=launch=cmdline,onuncaught=y,transport=xxx,server=y</code> | |
| 147 | + * </LI> | |
| 148 | + * <LI> | |
| 149 | + * Later, an uncaught exception is thrown in the target VM. The target | |
| 150 | + * VM generates the tranport-specific address at which it will | |
| 151 | + * listen for a connection. | |
| 152 | + * <LI>Target VM launches the debugger with the following items concatenated | |
| 153 | + * together (separated by spaces) to form the command line: | |
| 154 | + * <UL> | |
| 155 | + * <LI> The launch= value | |
| 156 | + * <LI> The transport= value | |
| 157 | + * <LI> The generated transport-specific address at which VM is listening for | |
| 158 | + * debugger connection. | |
| 159 | + * </UL> | |
| 160 | + * <LI> | |
| 161 | + * Upon launch, debugger selects a connector in the list | |
| 162 | + * returned by {@link #attachingConnectors} matching the transport with | |
| 163 | + * the name "xxx". | |
| 164 | + * <LI> | |
| 165 | + * Debugger changes the default connector parameters (obtained through | |
| 166 | + * {@link com.sun.jdi.connect.Connector#defaultArguments()}) to specify | |
| 167 | + * the transport specific address at which the VM is listenig. Optionally, | |
| 168 | + * other connector arguments can be presented to the user. | |
| 169 | + * <LI> | |
| 170 | + * Debugger calls the | |
| 171 | + * {@link com.sun.jdi.connect.AttachingConnector#attach(java.util.Map)} method | |
| 172 | + * of the selected to attach to the target VM. A {@link VirtualMachine} | |
| 173 | + * mirror is returned. | |
| 174 | + * </TD> | |
| 175 | + * </TR> | |
| 176 | + * </TABLE> | |
| 177 | + * | |
| 178 | + * <p> Connectors are created at start-up time. That is, they | |
| 179 | + * are created the first time that {@link | |
| 180 | + * com.sun.jdi.Bootstrap#virtualMachineManager()} is invoked. | |
| 181 | + * The list of all Connectors created at start-up time can be | |
| 182 | + * obtained from the VirtualMachineManager by invoking the | |
| 183 | + * {@link #allConnectors allConnectors} method. | |
| 184 | + * | |
| 185 | + * <p> Connectors are created at start-up time if they are | |
| 186 | + * installed on the platform. In addition, Connectors are created | |
| 187 | + * automatically by the VirtualMachineManager to encapsulate any | |
| 188 | + * {@link com.sun.jdi.connect.spi.TransportService} implementations | |
| 189 | + * that are installed on the platform. These two mechanisms for | |
| 190 | + * creating Connectors are described here. | |
| 191 | + * | |
| 192 | + * <p> A Connector is installed on the platform if it is installed | |
| 193 | + * in a jar file that is visible to the defining class loader of | |
| 194 | + * the {@link com.sun.jdi.connect.Connector} type, | |
| 195 | + * and that jar file contains a provider configuration file named | |
| 196 | + * <tt>com.sun.jdi.connect.Connector</tt> in the resource directory | |
| 197 | + * <tt>META-INF/services</tt>, and the provider configuration file | |
| 198 | + * lists the full-qualified class name of the Connector | |
| 199 | + * implementation. A Connector is a class that implements the | |
| 200 | + * {@link com.sun.jdi.connect.Connector Connector} interface. More | |
| 201 | + * appropriately the class implements one of the specific Connector | |
| 202 | + * types, namely {@link com.sun.jdi.connect.AttachingConnector | |
| 203 | + * AttachingConnector}, {@link com.sun.jdi.connect.ListeningConnector | |
| 204 | + * ListeningConnector}, or {@link com.sun.jdi.connect.LaunchingConnector | |
| 205 | + * LaunchingConnector}. The format of the provider configuration file | |
| 206 | + * is one fully-qualified class name per line. Space and tab characters | |
| 207 | + * surrounding each class, as well as blank lines are ignored. The | |
| 208 | + * comment character is <tt>'#'</tt> (<tt>0x23</tt>), and on each | |
| 209 | + * line all characters following the first comment character are | |
| 210 | + * ignored. The file must be encoded in UTF-8. | |
| 211 | + * | |
| 212 | + * <p> At start-up time the VirtualMachineManager attempts to load | |
| 213 | + * and instantiate (using the no-arg constructor) each class listed | |
| 214 | + * in the provider configuration file. Exceptions thrown when loading | |
| 215 | + * or creating the Connector are caught and ignored. In other words, | |
| 216 | + * the start-up process continues despite of errors. | |
| 217 | + * | |
| 218 | + * <p> In addition to Connectors installed on the platform the | |
| 219 | + * VirtualMachineManager will also create Connectors to encapsulate | |
| 220 | + * any {@link com.sun.jdi.connect.spi.TransportService} implementations | |
| 221 | + * that are installed on the platform. A TransportService is | |
| 222 | + * installed on the platform if it installed in a jar file that is | |
| 223 | + * visible to the defining class loader for the | |
| 224 | + * {@link com.sun.jdi.connect.spi.TransportService} type, and that jar | |
| 225 | + * file contains a provider configuration file named | |
| 226 | + * <tt>com.sun.jdi.connect.spi.TransportService</tt> in the resource | |
| 227 | + * directory <tt>META-INF/services</tt>, and the provider | |
| 228 | + * configuration file lists the the full-qualified class name of the | |
| 229 | + * TransportService implementation. A TransportService is a concrete | |
| 230 | + * sub-class of {@link com.sun.jdi.connect.spi.TransportService | |
| 231 | + * TransportService}. The format of the provider configuration file | |
| 232 | + * is the same as the provider configuration file for Connectors | |
| 233 | + * except that each class listed must be the fully-qualified class | |
| 234 | + * name of a class that implements the TransportService interface. | |
| 235 | + * | |
| 236 | + * <p> For each TransportService installed on the platform, the | |
| 237 | + * VirtualMachineManager creates a corresponding | |
| 238 | + * {@link com.sun.jdi.connect.AttachingConnector} and | |
| 239 | + * {@link com.sun.jdi.connect.ListeningConnector}. These | |
| 240 | + * Connectors are created to encapsulate a {@link | |
| 241 | + * com.sun.jdi.connect.Transport Transport} that in turn | |
| 242 | + * encapsulates the TransportService. | |
| 243 | + * The AttachingConnector will be named based on the name of the | |
| 244 | + * transport service concatenated with the string <tt>Attach</tt>. | |
| 245 | + * For example, if the transport service {@link | |
| 246 | + * com.sun.jdi.connect.spi.TransportService#name() name()} method | |
| 247 | + * returns <tt>telepathic</tt> then the AttachingConnector will | |
| 248 | + * be named <tt>telepathicAttach</tt>. Similiarly the ListeningConnector | |
| 249 | + * will be named with the string <tt>Listen</tt> tagged onto the | |
| 250 | + * name of the transport service. The {@link | |
| 251 | + * com.sun.jdi.connect.Connector#description() description()} method | |
| 252 | + * of both the AttachingConnector, and the ListeningConnector, will | |
| 253 | + * delegate to the {@link com.sun.jdi.connect.spi.TransportService#description() | |
| 254 | + * description()} method of the underlying transport service. Both | |
| 255 | + * the AttachingConnector and the ListeningConnector will have two | |
| 256 | + * Connector {@link com.sun.jdi.connect.Connector$Argument Arguments}. | |
| 257 | + * A {@link com.sun.jdi.connect.Connector$StringArgument StringArgument} | |
| 258 | + * named <tt>address</tt> is the connector argument to specify the | |
| 259 | + * address to attach too, or to listen on. A | |
| 260 | + * {@link com.sun.jdi.connect.Connector$IntegerArgument IntegerArgument} | |
| 261 | + * named <tt>timeout</tt> is the connector argument to specify the | |
| 262 | + * timeout when attaching, or accepting. The timeout connector may be | |
| 263 | + * ignored depending on if the transport service supports an attach | |
| 264 | + * timeout or accept timeout. | |
| 265 | + * | |
| 266 | + * <p> Initialization of the virtual machine manager will fail, that is | |
| 267 | + * {@link com.sun.jdi.Bootstrap#virtualMachineManager()} will throw an | |
| 268 | + * error if the virtual machine manager is unable to create any | |
| 269 | + * connectors. | |
| 270 | + * | |
| 271 | + * @author Gordon Hirsch | |
| 272 | + * @since 1.3 | |
| 273 | + */ | |
| 274 | +public interface VirtualMachineManager { | |
| 275 | + | |
| 276 | + /** | |
| 277 | + * Identifies the default connector. This connector should | |
| 278 | + * be used as the launching connector when selection of a | |
| 279 | + * connector with specific characteristics is unnecessary. | |
| 280 | + * | |
| 281 | + * @return the default {@link com.sun.jdi.connect.LaunchingConnector} | |
| 282 | + */ | |
| 283 | + LaunchingConnector defaultConnector(); | |
| 284 | + | |
| 285 | + /** | |
| 286 | + * Returns the list of known {@link com.sun.jdi.connect.LaunchingConnector} objects. | |
| 287 | + * Any of the returned objects can be used to launch a new target | |
| 288 | + * VM and immediately create a {@link VirtualMachine} mirror for it. | |
| 289 | + * | |
| 290 | + * Note that a target VM launched by a launching connector is not | |
| 291 | + * guaranteed to be stable until after the {@link com.sun.jdi.event.VMStartEvent} has been | |
| 292 | + * received. | |
| 293 | + * @return a list of {@link com.sun.jdi.connect.LaunchingConnector} objects. | |
| 294 | + */ | |
| 295 | + List<LaunchingConnector> launchingConnectors(); | |
| 296 | + | |
| 297 | + /** | |
| 298 | + * Returns the list of known {@link com.sun.jdi.connect.AttachingConnector} objects. | |
| 299 | + * Any of the returned objects can be used to attach to an existing target | |
| 300 | + * VM and create a {@link VirtualMachine} mirror for it. | |
| 301 | + * | |
| 302 | + * @return a list of {@link com.sun.jdi.connect.AttachingConnector} objects. | |
| 303 | + */ | |
| 304 | + List<AttachingConnector> attachingConnectors(); | |
| 305 | + | |
| 306 | + /** | |
| 307 | + * Returns the list of known {@link com.sun.jdi.connect.ListeningConnector} objects. | |
| 308 | + * Any of the returned objects can be used to listen for a | |
| 309 | + * connection initiated by a target VM | |
| 310 | + * and create a {@link VirtualMachine} mirror for it. | |
| 311 | + * | |
| 312 | + * @return a list of {@link com.sun.jdi.connect.ListeningConnector} objects. | |
| 313 | + */ | |
| 314 | + List<ListeningConnector> listeningConnectors(); | |
| 315 | + | |
| 316 | + /** | |
| 317 | + * Returns the list of all known {@link com.sun.jdi.connect.Connector} objects. | |
| 318 | + * | |
| 319 | + * @return a list of {@link com.sun.jdi.connect.Connector} objects. | |
| 320 | + */ | |
| 321 | + List<Connector> allConnectors(); | |
| 322 | + | |
| 323 | + /** | |
| 324 | + * Lists all target VMs which are connected to the debugger. | |
| 325 | + * The list includes {@link VirtualMachine} instances for | |
| 326 | + * any target VMs which initiated a connection | |
| 327 | + * and any | |
| 328 | + * target VMs to which this manager has initiated a connection. | |
| 329 | + * A target VM will remain in this list | |
| 330 | + * until the VM is disconnected. | |
| 331 | + * {@link com.sun.jdi.event.VMDisconnectEvent} is placed in the event queue | |
| 332 | + * after the VM is removed from the list. | |
| 333 | + * | |
| 334 | + * @return a list of {@link VirtualMachine} objects, each mirroring | |
| 335 | + * a target VM. | |
| 336 | + */ | |
| 337 | + List<VirtualMachine> connectedVirtualMachines(); | |
| 338 | + | |
| 339 | + /** | |
| 340 | + * Returns the major version number of the JDI interface. | |
| 341 | + * See {@link VirtualMachine#version} target VM version and | |
| 342 | + * information and | |
| 343 | + * {@link VirtualMachine#description} more version information. | |
| 344 | + * | |
| 345 | + * @return the integer major version number. | |
| 346 | + */ | |
| 347 | + int majorInterfaceVersion(); | |
| 348 | + | |
| 349 | + /** | |
| 350 | + * Returns the minor version number of the JDI interface. | |
| 351 | + * See {@link VirtualMachine#version} target VM version and | |
| 352 | + * information and | |
| 353 | + * {@link VirtualMachine#description} more version information. | |
| 354 | + * | |
| 355 | + * @return the integer minor version number | |
| 356 | + */ | |
| 357 | + int minorInterfaceVersion(); | |
| 358 | + | |
| 359 | + /** | |
| 360 | + * Create a virtual machine mirror for a target VM. | |
| 361 | + * | |
| 362 | + * <p> Creates a virtual machine mirror for a target VM | |
| 363 | + * for which a {@link com.sun.jdi.connect.spi.Connection Connection} | |
| 364 | + * already exists. A Connection is created when a {@link | |
| 365 | + * com.sun.jdi.connect.Connector Connector} establishes | |
| 366 | + * a connection and successfully handshakes with a target VM. | |
| 367 | + * A Connector can then use this method to create a virtual machine | |
| 368 | + * mirror to represent the composite state of the target VM. | |
| 369 | + * | |
| 370 | + * <p> The <tt>process</tt> argument specifies the | |
| 371 | + * {@link java.lang.Process} object for the taget VM. It may be | |
| 372 | + * specified as <tt>null</tt>. If the target VM is launched | |
| 373 | + * by a {@link com.sun.jdi.connect.LaunchingConnector | |
| 374 | + * LaunchingConnector} the <tt>process</tt> argument should be | |
| 375 | + * specified, otherwise calling {@link com.sun.jdi.VirtualMachine#process()} | |
| 376 | + * on the created virtual machine will return <tt>null</tt>. | |
| 377 | + * | |
| 378 | + * <p> This method exists so that Connectors may create | |
| 379 | + * a virtual machine mirror when a connection is established | |
| 380 | + * to a target VM. Only developers creating new Connector | |
| 381 | + * implementations should need to make direct use of this | |
| 382 | + * method. </p> | |
| 383 | + * | |
| 384 | + * @param connection | |
| 385 | + * The open connection to the target VM. | |
| 386 | + * | |
| 387 | + * @param process | |
| 388 | + * If launched, the {@link java.lang.Process} object for | |
| 389 | + * the target VM. <tt>null</tt> if not launched. | |
| 390 | + * | |
| 391 | + * @return new virtual machine representing the target VM. | |
| 392 | + * | |
| 393 | + * @throws IOException | |
| 394 | + * if an I/O error occurs | |
| 395 | + * | |
| 396 | + * @throws IllegalStateException | |
| 397 | + * if the connection is not open | |
| 398 | + * | |
| 399 | + * @see com.sun.jdi.connect.spi.Connection#isOpen() | |
| 400 | + * @see com.sun.jdi.VirtualMachine#process() | |
| 401 | + * | |
| 402 | + * @since 1.5 | |
| 403 | + */ | |
| 404 | + VirtualMachine createVirtualMachine(Connection connection, Process process) throws IOException; | |
| 405 | + | |
| 406 | + /** | |
| 407 | + * Creates a new virtual machine. | |
| 408 | + * | |
| 409 | + * <p> This convenience method works as if by invoking {@link | |
| 410 | + * #createVirtualMachine(Connection, Process)} method and | |
| 411 | + * specifying <tt>null</tt> as the <tt>process</tt> argument. | |
| 412 | + * | |
| 413 | + * <p> This method exists so that Connectors may create | |
| 414 | + * a virtual machine mirror when a connection is established | |
| 415 | + * to a target VM. Only developers creating new Connector | |
| 416 | + * implementations should need to make direct use of this | |
| 417 | + * method. </p> | |
| 418 | + * | |
| 419 | + * @return the new virtual machine | |
| 420 | + * | |
| 421 | + * @throws IOException | |
| 422 | + * if an I/O error occurs | |
| 423 | + * | |
| 424 | + * @throws IllegalStateException | |
| 425 | + * if the connection is not open | |
| 426 | + * | |
| 427 | + * @since 1.5 | |
| 428 | + */ | |
| 429 | + VirtualMachine createVirtualMachine(Connection connection) throws IOException; | |
| 430 | +} | |